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• Best way of storing voxels

  - by opiop65

  This should be a pretty easy question to answer, and I'm not looking for how to store the voxels data wise, I'm looking for the theory. Currently, my voxel engine has no global list of tiles. Each chunk has it's own list, and its hard to do things like collision detection or anything that may use tiles that are outside of its own chunk. I recently worked on procedural terrain with a non voxel engine. Now, I want to start using heightmaps in my voxel engine. But, I have a problem. If each chunk has its own list, then it will be pretty difficult to implement the heightmaps. My real question is, is should I store a global list of voxels independent of the chunks? And then I can just easily perform collision detection and terrain generation. However, it would probably be harder to do things such as frustum culling. So how should I store them?

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• Login failed for user 'sa' because the account is currently locked out. The system administrator can

  - by cabhilash

  Login failed for user 'sa' because the account is currently locked out. The system administrator can unlock it. (Microsoft SQL Server, Error: 18486) SQL server has local password policies. If policy is enabled which locks down the account after X number of failed attempts then the account is automatically locked down.This error with 'sa' account is very common. sa is default administartor login available with SQL server. So there are chances that an ousider has tried to bruteforce your system. (This can cause even if a legitimate tries to access the account with wrong password.Sometimes a user would have changed the password without informing others. So the other users would try to lo) You can unlock the account with the following options (use another admin account or connect via windows authentication) Alter account & unlock ALTER LOGIN sa WITH PASSWORD='password' UNLOCK Use another account Almost everyone is aware of the sa account. This can be the potential security risk. Even if you provide strong password hackers can lock the account by providing the wrong password. ( You can provide extra security by installing firewall or changing the default port but these measures are not always practical). As a best practice you can disable the sa account and use another account with same privileges.ALTER LOGIN sa DISABLE You can edit the lock-ot options using gpedit.msc( in command prompt type gpedit.msc and press enter). Navigate to Account Lokout policy as shown in the figure The Following options are available Account lockout threshold This security setting determines the number of failed logon attempts that causes a user account to be locked out. A locked-out account cannot be used until it is reset by an administrator or until the lockout duration for the account has expired. You can set a value between 0 and 999 failed logon attempts. If you set the value to 0, the account will never be locked out. Failed password attempts against workstations or member servers that have been locked using either CTRL+ALT+DELETE or password-protected screen savers count as failed logon attempts. Account lockout duration This security setting determines the number of minutes a locked-out account remains locked out before automatically becoming unlocked. The available range is from 0 minutes through 99,999 minutes. If you set the account lockout duration to 0, the account will be locked out until an administrator explicitly unlocks it. If an account lockout threshold is defined, the account lockout duration must be greater than or equal to the reset time. Default: None, because this policy setting only has meaning when an Account lockout threshold is specified. Reset account lockout counter after This security setting determines the number of minutes that must elapse after a failed logon attempt before the failed logon attempt counter is reset to 0 bad logon attempts. The available range is 1 minute to 99,999 minutes. If an account lockout threshold is defined, this reset time must be less than or equal to the Account lockout duration. Default: None, because this policy setting only has meaning when an Account lockout threshold is specified.When creating SQL user you can set CHECK_POLICY=on which will enforce the windows password policy on the account. The following policies will be applied Define the Enforce password history policy setting so that several previous passwords are remembered. With this policy setting, users cannot use the same password when their password expires.  Define the Maximum password age policy setting so that passwords expire as often as necessary for your environment, typically, every 30 to 90 days. With this policy setting, if an attacker cracks a password, the attacker only has access to the network until the password expires.  Define the Minimum password age policy setting so that passwords cannot be changed until they are more than a certain number of days old. This policy setting works in combination with the Enforce password historypolicy setting. If a minimum password age is defined, users cannot repeatedly change their passwords to get around the Enforce password history policy setting and then use their original password. Users must wait the specified number of days to change their passwords.  Define a Minimum password length policy setting so that passwords must consist of at least a specified number of characters. Long passwords--seven or more characters--are usually stronger than short ones. With this policy setting, users cannot use blank passwords, and they have to create passwords that are a certain number of characters long.  Enable the Password must meet complexity requirements policy setting. This policy setting checks all new passwords to ensure that they meet basic strong password requirements.  Password must meet the following complexity requirement, when they are changed or created: Not contain the user's entire Account Name or entire Full Name. The Account Name and Full Name are parsed for delimiters: commas, periods, dashes or hyphens, underscores, spaces, pound signs, and tabs. If any of these delimiters are found, the Account Name or Full Name are split and all sections are verified not to be included in the password. There is no check for any character or any three characters in succession. Contain characters from three of the following five categories:  English uppercase characters (A through Z) English lowercase characters (a through z) Base 10 digits (0 through 9) Non-alphabetic characters (for example, !, $, #, %) A catch-all category of any Unicode character that does not fall under the previous four categories. This fifth category can be regionally specific.

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• Oracle Linux and Oracle VM pricing guide

  - by wcoekaer

  A few days ago someone showed me a pricing guide from a Linux vendor and I was a bit surprised at the complexity of it. Especially when you look at larger servers (4 or 8 sockets) and when adding virtual machine use into the mix. I think we have a very compelling and simple pricing model for both Oracle Linux and Oracle VM. Let me see if I can explain it in 1 page, not 10 pages. This pricing information is publicly available on the Oracle store, I am using the current public list prices. Also keep in mind that this is for customers using non-oracle x86 servers. When a customer purchases an Oracle x86 server, the annual systems support includes full use (all you can eat) of Oracle Linux, Oracle VM and Oracle Solaris (no matter how many VMs you run on that server, in case you deploy guests on a hypervisor). This support level is the equivalent of premier support in the list below. Let's start with Oracle VM (x86) : Oracle VM support subscriptions are per physical server on which you deploy the Oracle VM Server product. (1) Oracle VM Premier Limited - 1- or 2 socket server : $599 per server per year (2) Oracle VM Premier - more than 2 socket server (4, or 8 or whatever more) : $1199 per server per year The above includes the use of Oracle VM Manager and Oracle Enterprise Manager Cloud Control's Virtualization management pack (including self service cloud portal, etc..) 24x7 support, access to bugfixes, updates and new releases. It also includes all options, live migrate, dynamic resource scheduling, high availability, dynamic power management, etc If you want to play with the product, or even use the product without access to support services, the product is freely downloadable from edelivery. Next, Oracle Linux : Oracle Linux support subscriptions are per physical server. If you plan to run Oracle Linux as a guest on Oracle VM, VMWare or Hyper-v, you only have to pay for a single subscription per system, we do not charge per guest or per number of guests. In other words, you can run any number of Oracle Linux guests per physical server and count it as just a single subscription. (1) Oracle Linux Network Support - any number of sockets per server : $119 per server per year Network support does not offer support services. It provides access to the Unbreakable Linux Network and also offers full indemnification for Oracle Linux. (2) Oracle Linux Basic Limited Support - 1- or 2 socket servers : $499 per server per year This subscription provides 24x7 support services, access to the Unbreakable Linux Network and the Oracle Support portal, indemnification, use of Oracle Clusterware for Linux HA and use of Oracle Enterprise Manager Cloud control for Linux OS management. It includes ocfs2 as a clustered filesystem. (3) Oracle Linux Basic Support - more than 2 socket server (4, or 8 or more) : $1199 per server per year This subscription provides 24x7 support services, access to the Unbreakable Linux Network and the Oracle Support portal, indemnification, use of Oracle Clusterware for Linux HA and use of Oracle Enterprise Manager Cloud control for Linux OS management. It includes ocfs2 as a clustered filesystem (4) Oracle Linux Premier Limited Support - 1- or 2 socket servers : $1399 per server per year This subscription provides 24x7 support services, access to the Unbreakable Linux Network and the Oracle Support portal, indemnification, use of Oracle Clusterware for Linux HA and use of Oracle Enterprise Manager Cloud control for Linux OS management, XFS filesystem support. It also offers Oracle Lifetime support, backporting of patches for critical customers in previous versions of package and ksplice zero-downtime updates. (5) Oracle Linux Premier Support - more than 2 socket servers : $2299 per server per year This subscription provides 24x7 support services, access to the Unbreakable Linux Network and the Oracle Support portal, indemnification, use of Oracle Clusterware for Linux HA and use of Oracle Enterprise Manager Cloud control for Linux OS management, XFS filesystem support. It also offers Oracle Lifetime support, backporting of patches for critical customers in previous versions of package and ksplice zero-downtime updates. (6) Freely available Oracle Linux - any number of sockets You can freely download Oracle Linux, install it on any number of servers and use it for any reason, without support, without right to use of these extra features like Oracle Clusterware or ksplice, without indemnification. However, you do have full access to all errata as well. Need support? then use options (1)..(5) So that's it. Count number of 2 socket boxes, more than 2 socket boxes, decide on basic or premier support level and you are done. You don't have to worry about different levels based on how many virtual instance you deploy or want to deploy. A very simple menu of choices. We offer, inclusive, Linux OS clusterware, Linux OS Management, provisioning and monitoring, cluster filesystem (ocfs), high performance filesystem (xfs), dtrace, ksplice, ofed (infiniband stack for high performance networking). No separate add-on menus. NOTE : socket/cpu can have any number of cores. So whether you have a 4,6,8,10 or 12 core CPU doesn't matter, we count the number of physical CPUs.

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• Isometric drawing "Not Tile Stuff" on isometric map?

  - by Icebone1000

  So I got my isometric renderer working, it can draw diamond or jagged maps...Then I want to move on...How do I draw characters/objects on it in a optimal way? What Im doing now, as one can imagine, is traversing my grid(map) and drawing the tiles in a order so alpha blending works correctly. So, anything I draw in this map must be drawed at the same time the map is being drawn, with sucks a lot, screws your very modular map drawer, because now everything on the game (but the HUD) must be included on the drawer.. I was thinking whats the best approach to do this, comparing the position of all objects(not tile stuff) on the grid against the current tile being draw seems stupid, would it be better to add an id ON the grid(map)? this also seems terrible, because objects can move freely, not per tile steps (it can occupies 2 tiles if its between them, etc.) Dont know if matters, but my grid is 3D, so its not a plane with objects poping out, its a bunch of pilled cubes.

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• Oracle SOA Suite for healthcare integration Dashboard By Nitesh Jain

  - by JuergenKress

  Oracle SOA Suite Healthcare came up with a new way of monitoring where user can configure a dashboard and follow the dynamic runtime changes. Oracle SOA Suite for healthcare integration dashboards display information about the current health of the endpoints in a healthcare integration application. You can create and configure multiple dashboards as needed to monitor the status and volume metrics for the endpoints you have defined. The Dashboards reflects changes that occur in the runtime repository, such as purging runtime instance data, new messages processed, and new error messages. You can display data for various time periods, and you can manually refresh the data in real time or set the dashboard to automatically refresh at set intervals. Dashboard shows the following information: Status: The current status of the endpoint, such as Running, Idle, Disabled, or Errors. Messages Sent: The number of messages sent by the endpoint in the specified time period. Messages Received: The number of messages received by the endpoint in the specified time period. Errors: The number of messages with errors for the endpoint in the given time period. Last Sent: The date and time the last message was sent from the endpoint. Last Received: The date and time the last message was received from the endpoint. Last Error: The date and time of the last error for the endpoint. It also shows the detailed view of a specific Endpoint. The document type. The number of messages received per second. The total number of message processed in the specified time period. The average size of each message. For more information please visit Nitesh Jain blog SOA & BPM Partner Community For regular information on Oracle SOA Suite become a member in the SOA & BPM Partner Community for registration please visit  www.oracle.com/goto/emea/soa (OPN account required) If you need support with your account please contact the Oracle Partner Business Center. Blog Twitter LinkedIn Mix Forum Technorati Tags: SOA Suite,SOA heathcare,soa health,SOA Community,Oracle SOA,Oracle BPM,Community,OPN,Jürgen Kress

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• HSSFS Part 2.1 - Parsing @@VERSION

  - by Most Valuable Yak (Rob Volk)

  For Part 2 of the Handy SQL Server Function Series I decided to tackle parsing useful information from the @@VERSION function, because I am an idiot.  It turns out I was confused about CHARINDEX() vs. PATINDEX() and it pretty much invalidated my original solution.  All is not lost though, this mistake turned out to be informative for me, and hopefully for you. Referring back to the "Version" view in the prelude I started with the following query to extract the version number: SELECT DISTINCT SQLVersion, SUBSTRING(VersionString,PATINDEX('%-%',VersionString)+2, 12) VerNum FROM VERSION I used PATINDEX() to find the first hyphen "-" character in the string, since the version number appears 2 positions after it, and got these results: SQLVersion VerNum ----------- ------------ 2000 8.00.2055 (I 2005 9.00.3080.00 2005 9.00.4053.00 2008 10.50.1600.1 As you can see it was good enough for most of the values, but not for the SQL 2000 @@VERSION.  You'll notice it has only 3 version sections/octets where the others have 4, and the SUBSTRING() grabbed the non-numeric characters after.  To properly parse the version number will require a non-fixed value for the 3rd parameter of SUBSTRING(), which is the number of characters to extract. The best value is the position of the first space to occur after the version number (VN), the trick is to figure out how to find it.  Here's where my confusion about PATINDEX() came about.  The CHARINDEX() function has a handy optional 3rd parameter: CHARINDEX (expression1 ,expression2 [ ,start_location ] ) While PATINDEX(): PATINDEX ('%pattern%',expression ) Does not.  I had expected to use PATINDEX() to start searching for a space AFTER the position of the VN, but it doesn't work that way.  Since there are plenty of spaces before the VN, I thought I'd try PATINDEX() on another character that doesn't appear before, and tried "(": SELECT SQLVersion, SUBSTRING(VersionString,PATINDEX('%-%',VersionString)+2, PATINDEX('%(%',VersionString)) FROM VERSION Unfortunately this messes up the length calculation and yields: SQLVersion VerNum ----------- --------------------------- 2000 8.00.2055 (Intel X86) Dec 16 2008 19:4 2005 9.00.3080.00 (Intel X86) Sep 6 2009 01: 2005 9.00.4053.00 (Intel X86) May 26 2009 14: 2008 10.50.1600.1 (Intel X86) Apr 2008 10.50.1600.1 (X64) Apr 2 20 Yuck.  The problem is that PATINDEX() returns position, and SUBSTRING() needs length, so I have to subtract the VN starting position: SELECT SQLVersion, SUBSTRING(VersionString,PATINDEX('%-%',VersionString)+2, PATINDEX('%(%',VersionString)-PATINDEX('%-%',VersionString)) VerNum FROM VERSION And the results are: SQLVersion VerNum ----------- -------------------------------------------------------- 2000 8.00.2055 (I 2005 9.00.4053.00 (I Msg 537, Level 16, State 2, Line 1 Invalid length parameter passed to the LEFT or SUBSTRING function. Ummmm, whoops.  Turns out SQL Server 2008 R2 includes "(RTM)" before the VN, and that causes the length to turn negative. So now that that blew up, I started to think about matching digit and dot (.) patterns.  Sadly, a quick look at the first set of results will quickly scuttle that idea, since different versions have different digit patterns and lengths. At this point (which took far longer than I wanted) I decided to cut my losses and redo the query using CHARINDEX(), which I'll cover in Part 2.2.  So to do a little post-mortem on this technique: PATINDEX() doesn't have the flexibility to match the digit pattern of the version number; PATINDEX() doesn't have a "start" parameter like CHARINDEX(), that allows us to skip over parts of the string; The SUBSTRING() expression is getting pretty complicated for this relatively simple task! This doesn't mean that PATINDEX() isn't useful, it's just not a good fit for this particular problem.  I'll include a version in the next post that extracts the version number properly. UPDATE: Sorry if you saw the unformatted version of this earlier, I'm on a quest to find blog software that ACTUALLY WORKS.

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• Are CK Metrics still considered useful? Is there an open source tool to help?

  - by DeveloperDon

  Chidamber & Kemerer proposed several metrics for object oriented code. Among them, depth of inheritance tree, weighted number of methods, number of member functions, number of children, and coupling between objects. Using a base of code, they tried to correlated these metrics to the defect density and maintenance effort using covariant analysis. Are these metrics actionable in projects? Perhaps they can guide refactoring. For example weighted number of methods might show which God classes needed to be broken into more cohesive classes that address a single concern. Is there approach superseded by a better method, and is there a tool that can identify problem code, particularly in moderately large project being handed off to a new developer or team?

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• Strange Windows DIR command behavior

  - by user1167442

  I discovered this quite by accident while looking for a file with a number in the name. When I type: dir *number* (where number represents any number from 0 to 9 and with no spaces between the asterisks and the number) at the cmd.exe command prompt, it returns various files do not appear in any to fit the search criteria. What's weird, is that depending on the directory, some numbers will work and not others. An example is, in a directory associated with a website, I type the following: dir *4* and what is returned is: Directory of C:\Ampps\www\includes\pages 04/30/2012 03:55 PM 153 inventory_list_retrieve.php 06/18/2012 11:17 AM 6,756 ix.html 06/19/2012 01:47 PM 257,501 jquery.1.7.1.js 3 File(s) 264,410 bytes 0 Dir(s) 362,280,906,752 bytes free That just doesn't make any sense to me. Any clue? The question is posed on stackOverflow because the DIR command is often combined with FOR in batch programs. The strange DIR behavior would seem to make batch programs potentially unreliable if they use the DIR command.

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• Inside the Concurrent Collections: ConcurrentDictionary

  - by Simon Cooper

  Using locks to implement a thread-safe collection is rather like using a sledgehammer - unsubtle, easy to understand, and tends to make any other tool redundant. Unlike the previous two collections I looked at, ConcurrentStack and ConcurrentQueue, ConcurrentDictionary uses locks quite heavily. However, it is careful to wield locks only where necessary to ensure that concurrency is maximised. This will, by necessity, be a higher-level look than my other posts in this series, as there is quite a lot of code and logic in ConcurrentDictionary. Therefore, I do recommend that you have ConcurrentDictionary open in a decompiler to have a look at all the details that I skip over. The problem with locks There's several things to bear in mind when using locks, as encapsulated by the lock keyword in C# and the System.Threading.Monitor class in .NET (if you're unsure as to what lock does in C#, I briefly covered it in my first post in the series): Locks block threads The most obvious problem is that threads waiting on a lock can't do any work at all. No preparatory work, no 'optimistic' work like in ConcurrentQueue and ConcurrentStack, nothing. It sits there, waiting to be unblocked. This is bad if you're trying to maximise concurrency. Locks are slow Whereas most of the methods on the Interlocked class can be compiled down to a single CPU instruction, ensuring atomicity at the hardware level, taking out a lock requires some heavy lifting by the CLR and the operating system. There's quite a bit of work required to take out a lock, block other threads, and wake them up again. If locks are used heavily, this impacts performance. Deadlocks When using locks there's always the possibility of a deadlock - two threads, each holding a lock, each trying to aquire the other's lock. Fortunately, this can be avoided with careful programming and structured lock-taking, as we'll see. So, it's important to minimise where locks are used to maximise the concurrency and performance of the collection. Implementation As you might expect, ConcurrentDictionary is similar in basic implementation to the non-concurrent Dictionary, which I studied in a previous post. I'll be using some concepts introduced there, so I recommend you have a quick read of it. So, if you were implementing a thread-safe dictionary, what would you do? The naive implementation is to simply have a single lock around all methods accessing the dictionary. This would work, but doesn't allow much concurrency. Fortunately, the bucketing used by Dictionary allows a simple but effective improvement to this - one lock per bucket. This allows different threads modifying different buckets to do so in parallel. Any thread making changes to the contents of a bucket takes the lock for that bucket, ensuring those changes are thread-safe. The method that maps each bucket to a lock is the GetBucketAndLockNo method: private void GetBucketAndLockNo( int hashcode, out int bucketNo, out int lockNo, int bucketCount) { // the bucket number is the hashcode (without the initial sign bit) // modulo the number of buckets bucketNo = (hashcode & 0x7fffffff) % bucketCount; // and the lock number is the bucket number modulo the number of locks lockNo = bucketNo % m_locks.Length; } However, this does require some changes to how the buckets are implemented. The 'implicit' linked list within a single backing array used by the non-concurrent Dictionary adds a dependency between separate buckets, as every bucket uses the same backing array. Instead, ConcurrentDictionary uses a strict linked list on each bucket: This ensures that each bucket is entirely separate from all other buckets; adding or removing an item from a bucket is independent to any changes to other buckets. Modifying the dictionary All the operations on the dictionary follow the same basic pattern: void AlterBucket(TKey key, ...) { int bucketNo, lockNo; 1: GetBucketAndLockNo( key.GetHashCode(), out bucketNo, out lockNo, m_buckets.Length); 2: lock (m_locks[lockNo]) { 3: Node headNode = m_buckets[bucketNo]; 4: Mutate the node linked list as appropriate } } For example, when adding another entry to the dictionary, you would iterate through the linked list to check whether the key exists already, and add the new entry as the head node. When removing items, you would find the entry to remove (if it exists), and remove the node from the linked list. Adding, updating, and removing items all follow this pattern. Performance issues There is a problem we have to address at this point. If the number of buckets in the dictionary is fixed in the constructor, then the performance will degrade from O(1) to O(n) when a large number of items are added to the dictionary. As more and more items get added to the linked lists in each bucket, the lookup operations will spend most of their time traversing a linear linked list. To fix this, the buckets array has to be resized once the number of items in each bucket has gone over a certain limit. (In ConcurrentDictionary this limit is when the size of the largest bucket is greater than the number of buckets for each lock. This check is done at the end of the TryAddInternal method.) Resizing the bucket array and re-hashing everything affects every bucket in the collection. Therefore, this operation needs to take out every lock in the collection. Taking out mutiple locks at once inevitably summons the spectre of the deadlock; two threads each hold a lock, and each trying to acquire the other lock. How can we eliminate this? Simple - ensure that threads never try to 'swap' locks in this fashion. When taking out multiple locks, always take them out in the same order, and always take out all the locks you need before starting to release them. In ConcurrentDictionary, this is controlled by the AcquireLocks, AcquireAllLocks and ReleaseLocks methods. Locks are always taken out and released in the order they are in the m_locks array, and locks are all released right at the end of the method in a finally block. At this point, it's worth pointing out that the locks array is never re-assigned, even when the buckets array is increased in size. The number of locks is fixed in the constructor by the concurrencyLevel parameter. This simplifies programming the locks; you don't have to check if the locks array has changed or been re-assigned before taking out a lock object. And you can be sure that when a thread takes out a lock, another thread isn't going to re-assign the lock array. This would create a new series of lock objects, thus allowing another thread to ignore the existing locks (and any threads controlling them), breaking thread-safety. Consequences of growing the array Just because we're using locks doesn't mean that race conditions aren't a problem. We can see this by looking at the GrowTable method. The operation of this method can be boiled down to: private void GrowTable(Node[] buckets) { try { 1: Acquire first lock in the locks array // this causes any other thread trying to take out // all the locks to block because the first lock in the array // is always the one taken out first // check if another thread has already resized the buckets array // while we were waiting to acquire the first lock 2: if (buckets != m_buckets) return; 3: Calculate the new size of the backing array 4: Node[] array = new array[size]; 5: Acquire all the remaining locks 6: Re-hash the contents of the existing buckets into array 7: m_buckets = array; } finally { 8: Release all locks } } As you can see, there's already a check for a race condition at step 2, for the case when the GrowTable method is called twice in quick succession on two separate threads. One will successfully resize the buckets array (blocking the second in the meantime), when the second thread is unblocked it'll see that the array has already been resized & exit without doing anything. There is another case we need to consider; looking back at the AlterBucket method above, consider the following situation: Thread 1 calls AlterBucket; step 1 is executed to get the bucket and lock numbers. Thread 2 calls GrowTable and executes steps 1-5; thread 1 is blocked when it tries to take out the lock in step 2. Thread 2 re-hashes everything, re-assigns the buckets array, and releases all the locks (steps 6-8). Thread 1 is unblocked and continues executing, but the calculated bucket and lock numbers are no longer valid. Between calculating the correct bucket and lock number and taking out the lock, another thread has changed where everything is. Not exactly thread-safe. Well, a similar problem was solved in ConcurrentStack and ConcurrentQueue by storing a local copy of the state, doing the necessary calculations, then checking if that state is still valid. We can use a similar idea here: void AlterBucket(TKey key, ...) { while (true) { Node[] buckets = m_buckets; int bucketNo, lockNo; GetBucketAndLockNo( key.GetHashCode(), out bucketNo, out lockNo, buckets.Length); lock (m_locks[lockNo]) { // if the state has changed, go back to the start if (buckets != m_buckets) continue; Node headNode = m_buckets[bucketNo]; Mutate the node linked list as appropriate } break; } } TryGetValue and GetEnumerator And so, finally, we get onto TryGetValue and GetEnumerator. I've left these to the end because, well, they don't actually use any locks. How can this be? Whenever you change a bucket, you need to take out the corresponding lock, yes? Indeed you do. However, it is important to note that TryGetValue and GetEnumerator don't actually change anything. Just as immutable objects are, by definition, thread-safe, read-only operations don't need to take out a lock because they don't change anything. All lockless methods can happily iterate through the buckets and linked lists without worrying about locking anything. However, this does put restrictions on how the other methods operate. Because there could be another thread in the middle of reading the dictionary at any time (even if a lock is taken out), the dictionary has to be in a valid state at all times. Every change to state has to be made visible to other threads in a single atomic operation (all relevant variables are marked volatile to help with this). This restriction ensures that whatever the reading threads are doing, they never read the dictionary in an invalid state (eg items that should be in the collection temporarily removed from the linked list, or reading a node that has had it's key & value removed before the node itself has been removed from the linked list). Fortunately, all the operations needed to change the dictionary can be done in that way. Bucket resizes are made visible when the new array is assigned back to the m_buckets variable. Any additions or modifications to a node are done by creating a new node, then splicing it into the existing list using a single variable assignment. Node removals are simply done by re-assigning the node's m_next pointer. Because the dictionary can be changed by another thread during execution of the lockless methods, the GetEnumerator method is liable to return dirty reads - changes made to the dictionary after GetEnumerator was called, but before the enumeration got to that point in the dictionary. It's worth listing at this point which methods are lockless, and which take out all the locks in the dictionary to ensure they get a consistent view of the dictionary: Lockless: TryGetValue GetEnumerator The indexer getter ContainsKey Takes out every lock (lockfull?): Count IsEmpty Keys Values CopyTo ToArray Concurrent principles That covers the overall implementation of ConcurrentDictionary. I haven't even begun to scratch the surface of this sophisticated collection. That I leave to you. However, we've looked at enough to be able to extract some useful principles for concurrent programming: Partitioning When using locks, the work is partitioned into independant chunks, each with its own lock. Each partition can then be modified concurrently to other partitions. Ordered lock-taking When a method does need to control the entire collection, locks are taken and released in a fixed order to prevent deadlocks. Lockless reads Read operations that don't care about dirty reads don't take out any lock; the rest of the collection is implemented so that any reading thread always has a consistent view of the collection. That leads us to the final collection in this little series - ConcurrentBag. Lacking a non-concurrent analogy, it is quite different to any other collection in the class libraries. Prepare your thinking hats!

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• Vote of Disconfidence to Entity Framework

  - by Ricardo Peres

  A friend of mine has found the following problem with Entity Framework 4: Two simple classes and one association between them (one to many): One condition to filter out soft-deleted entities (WHERE Deleted = 0): 100 records in the database; A simple query: 1: var l = ctx.Person.Include("Address").Where(x => (x.Address.Name == "317 Oak Blvd." && x.Address.Number == 926) || (x.Address.Name == "891 White Milton Drive" && x.Address.Number == 497)); Will produce the following SQL: 1: SELECT 2: [Extent1].[Id] AS [Id], 3: [Extent1].[FullName] AS [FullName], 4: [Extent1].[AddressId] AS [AddressId], 5: [Extent202].[Id] AS [Id1], 6: [Extent202].[Name] AS [Name], 7: [Extent202].[Number] AS [Number] 8: FROM [dbo].[Person] AS [Extent1] 9: LEFT OUTER JOIN [dbo].[Address] AS [Extent2] ON ([Extent2].[Deleted] = 0) AND ([Extent1].[AddressId] = [Extent2].[Id]) 10: LEFT OUTER JOIN [dbo].[Address] AS [Extent3] ON ([Extent3].[Deleted] = 0) AND ([Extent1].[AddressId] = [Extent3].[Id]) 11: LEFT OUTER JOIN [dbo].[Address] AS [Extent4] ON ([Extent4].[Deleted] = 0) AND ([Extent1].[AddressId] = [Extent4].[Id]) 12: LEFT OUTER JOIN [dbo].[Address] AS [Extent5] ON ([Extent5].[Deleted] = 0) AND ([Extent1].[AddressId] = [Extent5].[Id]) 13: LEFT OUTER JOIN [dbo].[Address] AS [Extent6] ON ([Extent6].[Deleted] = 0) AND ([Extent1].[AddressId] = [Extent6].[Id]) 14: ... 15: WHERE ((N'317 Oak Blvd.' = [Extent2].[Name]) AND (926 = [Extent3].[Number])) 16: ... And will result in 680 MB of memory being taken! Now, Entity Framework has been historically known for producing less than optimal SQL, but 680 MB for 100 entities?! According to Microsoft, the problem will be addressed in the following version, there is a Connect issue open. There is even a whitepaper, Performance Considerations for Entity Framework 5, which talks about some of the changes and optimizations coming on version 5, but by reading it, I got even more concerned: “Once the cache contains a set number of entries (800), we start a timer that periodically (once-per-minute) sweeps the cache.” Say what?! The next version of Entity Framework will spawn timer threads?! When Code First came along, I thought it was a step in the right direction. Sure, it didn’t include some things that NHibernate did for quite some time – for example, different strategies for Id generation that do not rely on IDENTITY columns, which makes INSERT batching impossible, or support for enumerated types – but I thought these would come with the time. Now, enumerated types have, but so did… timer threads! I’m afraid Entity Framework is becoming a monster.

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• Project Euler 8: (Iron)Python

  - by Ben Griswold

  In my attempt to learn (Iron)Python out in the open, here’s my solution for Project Euler Problem 8.  As always, any feedback is welcome. # Euler 8 # http://projecteuler.net/index.php?section=problems&id=8 # Find the greatest product of five consecutive digits # in the following 1000-digit number import time start = time.time() number = '\ 73167176531330624919225119674426574742355349194934\ 96983520312774506326239578318016984801869478851843\ 85861560789112949495459501737958331952853208805511\ 12540698747158523863050715693290963295227443043557\ 66896648950445244523161731856403098711121722383113\ 62229893423380308135336276614282806444486645238749\ 30358907296290491560440772390713810515859307960866\ 70172427121883998797908792274921901699720888093776\ 65727333001053367881220235421809751254540594752243\ 52584907711670556013604839586446706324415722155397\ 53697817977846174064955149290862569321978468622482\ 83972241375657056057490261407972968652414535100474\ 82166370484403199890008895243450658541227588666881\ 16427171479924442928230863465674813919123162824586\ 17866458359124566529476545682848912883142607690042\ 24219022671055626321111109370544217506941658960408\ 07198403850962455444362981230987879927244284909188\ 84580156166097919133875499200524063689912560717606\ 05886116467109405077541002256983155200055935729725\ 71636269561882670428252483600823257530420752963450' max = 0 for i in xrange(0, len(number) - 5): nums = [int(x) for x in number[i:i+5]] val = reduce(lambda agg, x: agg*x, nums) if val > max: max = val print max print "Elapsed Time:", (time.time() - start) * 1000, "millisecs" a=raw_input('Press return to continue')

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• How to get current connection settings

  - by Peter Larsson

  SELECT name AS Setting,         CASE             WHEN @@OPTIONS & number = number THEN 'ON'             ELSE 'OFF'         END AS Value FROM    master..spt_values WHERE   type= 'SOP'         AND number > 0

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• Which techniques to study?

  - by Djentleman

  Just to give you some background info, I'm studying a programming major at a tertiary level and am in my third year, so I'm not a newbie off the street. However, I am still quite new to game programming as a subset of programming. One of my personal projects for next semester is to design and create a 2D platformer game with emphasis on procedural generation and "neato" effects (think metroidvania). I've written up a list of some techniques to help me improve my personal skills (using XNA for the time being). The list is as follows: QuadTrees: Build a basic program in XNA that moves basic 2D sprites (circles and squares) around a set path and speed and changes their colour when they collide. Add functionality to add and delete objects of different sizes (select a direction and speed when adding and just drag and drop them in). Particles: Build a basic program in XNA in which you can select different colours and create particle effects of those colours on screen by clicking and dragging the mouse around (simple particles emerging from where the mouse is clicked). Add functionality where you can change the amount of particles to be drawn and the speed at which they travel and when they expire. Possibly implement gravity and wind after part 3 is complete. Physics: Build a basic program in XNA where you have a ball in a set 2D environment, a wind slider, and a gravity slider (can go to negative for reverse gravity). You can click to drag the ball around and release to throw it and, depending on what you do, the ball interacts with the environment. Implement other shapes afterwards. Random 2D terrain generation: Build a basic program in XNA that randomly generates terrain (including hills, caves, etc) created from 2D tiles. Add functionality that draws the tiles from a tileset and places different tiles depending on where they lie on the y-axis (dirt on top, then rock, then lava, etc). Randomised objects: Build a basic program in XNA that, when a button is clicked, displays a randomised item sprite based on parameters (type, colour, etc) with the images pulled from tilesets. Add the ability to save the item as an object, which stores it in a side-pane where it can be selected for viewing. Movement: Build a basic program in XNA where you can move an object around in an environment (tile-based) with a camera that pans with it. No gravity. Implement gravity and wind, allow the character to jump and fall with some basic platforms. So my question is this: Are there any other commonly used techniques that I should research, and can I get some suggestions as to the effectiveness of the techniques I've chosen to work on (e.g., don't do QuadTree stuff because [insert reason here], or, do [insert technique here] before you start working on particles because [insert reason here])? I hope this is clear enough and please let me know if I can further clarify anything!

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• Acer aspire 5735z wireless not working after upgrade to 11.10

  - by Jon

  I cant get my wifi card to work at all after upgrading to 11.10 Oneiric. I'm not sure where to start to fix this. Ive tried using the additional drivers tool but this shows that no additional drivers are needed. Before my upgrade I had a drivers working for the Rt2860 chipset. Any help on this would be much appreciated.... thanks Jon jon@ubuntu:~$ ifconfig eth0 Link encap:Ethernet HWaddr 00:1d:72:ec:76:d5 inet addr:192.168.1.134 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::21d:72ff:feec:76d5/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:7846 errors:0 dropped:0 overruns:0 frame:0 TX packets:7213 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:8046624 (8.0 MB) TX bytes:1329442 (1.3 MB) Interrupt:16 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:91 errors:0 dropped:0 overruns:0 frame:0 TX packets:91 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:34497 (34.4 KB) TX bytes:34497 (34.4 KB) Ive included by dmesg output below [ 0.428818] NET: Registered protocol family 2 [ 0.429003] IP route cache hash table entries: 131072 (order: 8, 1048576 bytes) [ 0.430562] TCP established hash table entries: 524288 (order: 11, 8388608 bytes) [ 0.436614] TCP bind hash table entries: 65536 (order: 8, 1048576 bytes) [ 0.437409] TCP: Hash tables configured (established 524288 bind 65536) [ 0.437412] TCP reno registered [ 0.437431] UDP hash table entries: 2048 (order: 4, 65536 bytes) [ 0.437482] UDP-Lite hash table entries: 2048 (order: 4, 65536 bytes) [ 0.437678] NET: Registered protocol family 1 [ 0.437705] pci 0000:00:02.0: Boot video device [ 0.437892] PCI: CLS 64 bytes, default 64 [ 0.437916] Simple Boot Flag at 0x57 set to 0x1 [ 0.438294] audit: initializing netlink socket (disabled) [ 0.438309] type=2000 audit(1319243447.432:1): initialized [ 0.440763] Freeing initrd memory: 13416k freed [ 0.468362] HugeTLB registered 2 MB page size, pre-allocated 0 pages [ 0.488192] VFS: Disk quotas dquot_6.5.2 [ 0.488254] Dquot-cache hash table entries: 512 (order 0, 4096 bytes) [ 0.488888] fuse init (API version 7.16) [ 0.488985] msgmni has been set to 5890 [ 0.489381] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 253) [ 0.489413] io scheduler noop registered [ 0.489415] io scheduler deadline registered [ 0.489460] io scheduler cfq registered (default) [ 0.489583] pcieport 0000:00:1c.0: setting latency timer to 64 [ 0.489633] pcieport 0000:00:1c.0: irq 40 for MSI/MSI-X [ 0.489699] pcieport 0000:00:1c.1: setting latency timer to 64 [ 0.489741] pcieport 0000:00:1c.1: irq 41 for MSI/MSI-X [ 0.489800] pcieport 0000:00:1c.2: setting latency timer to 64 [ 0.489841] pcieport 0000:00:1c.2: irq 42 for MSI/MSI-X [ 0.489904] pcieport 0000:00:1c.3: setting latency timer to 64 [ 0.489944] pcieport 0000:00:1c.3: irq 43 for MSI/MSI-X [ 0.490006] pcieport 0000:00:1c.4: setting latency timer to 64 [ 0.490047] pcieport 0000:00:1c.4: irq 44 for MSI/MSI-X [ 0.490126] pci_hotplug: PCI Hot Plug PCI Core version: 0.5 [ 0.490149] pciehp: PCI Express Hot Plug Controller Driver version: 0.4 [ 0.490196] intel_idle: MWAIT substates: 0x1110 [ 0.490198] intel_idle: does not run on family 6 model 15 [ 0.491240] ACPI: Deprecated procfs I/F for AC is loaded, please retry with CONFIG_ACPI_PROCFS_POWER cleared [ 0.493473] ACPI: AC Adapter [ADP1] (on-line) [ 0.493590] input: Lid Switch as /devices/LNXSYSTM:00/device:00/PNP0C0D:00/input/input0 [ 0.496771] ACPI: Lid Switch [LID0] [ 0.496818] input: Sleep Button as /devices/LNXSYSTM:00/device:00/PNP0C0E:00/input/input1 [ 0.496823] ACPI: Sleep Button [SLPB] [ 0.496865] input: Power Button as /devices/LNXSYSTM:00/LNXPWRBN:00/input/input2 [ 0.496869] ACPI: Power Button [PWRF] [ 0.496900] ACPI: acpi_idle registered with cpuidle [ 0.498719] Monitor-Mwait will be used to enter C-1 state [ 0.498753] Monitor-Mwait will be used to enter C-2 state [ 0.498761] Marking TSC unstable due to TSC halts in idle [ 0.517627] thermal LNXTHERM:00: registered as thermal_zone0 [ 0.517630] ACPI: Thermal Zone [TZS0] (67 C) [ 0.524796] thermal LNXTHERM:01: registered as thermal_zone1 [ 0.524799] ACPI: Thermal Zone [TZS1] (67 C) [ 0.524823] ACPI: Deprecated procfs I/F for battery is loaded, please retry with CONFIG_ACPI_PROCFS_POWER cleared [ 0.524852] ERST: Table is not found! [ 0.524948] Serial: 8250/16550 driver, 32 ports, IRQ sharing enabled [ 0.680991] ACPI: Battery Slot [BAT0] (battery present) [ 0.688567] Linux agpgart interface v0.103 [ 0.688672] agpgart-intel 0000:00:00.0: Intel GM45 Chipset [ 0.688865] agpgart-intel 0000:00:00.0: detected gtt size: 2097152K total, 262144K mappable [ 0.689786] agpgart-intel 0000:00:00.0: detected 65536K stolen memory [ 0.689912] agpgart-intel 0000:00:00.0: AGP aperture is 256M @ 0xd0000000 [ 0.691006] brd: module loaded [ 0.691510] loop: module loaded [ 0.691967] Fixed MDIO Bus: probed [ 0.691990] PPP generic driver version 2.4.2 [ 0.692065] tun: Universal TUN/TAP device driver, 1.6 [ 0.692067] tun: (C) 1999-2004 Max Krasnyansky <[email protected]> [ 0.692146] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver [ 0.692181] ehci_hcd 0000:00:1a.7: PCI INT C -> GSI 20 (level, low) -> IRQ 20 [ 0.692206] ehci_hcd 0000:00:1a.7: setting latency timer to 64 [ 0.692210] ehci_hcd 0000:00:1a.7: EHCI Host Controller [ 0.692255] ehci_hcd 0000:00:1a.7: new USB bus registered, assigned bus number 1 [ 0.692289] ehci_hcd 0000:00:1a.7: debug port 1 [ 0.696181] ehci_hcd 0000:00:1a.7: cache line size of 64 is not supported [ 0.696202] ehci_hcd 0000:00:1a.7: irq 20, io mem 0xf8904800 [ 0.712014] ehci_hcd 0000:00:1a.7: USB 2.0 started, EHCI 1.00 [ 0.712131] hub 1-0:1.0: USB hub found [ 0.712136] hub 1-0:1.0: 6 ports detected [ 0.712230] ehci_hcd 0000:00:1d.7: PCI INT A -> GSI 23 (level, low) -> IRQ 23 [ 0.712243] ehci_hcd 0000:00:1d.7: setting latency timer to 64 [ 0.712247] ehci_hcd 0000:00:1d.7: EHCI Host Controller [ 0.712287] ehci_hcd 0000:00:1d.7: new USB bus registered, assigned bus number 2 [ 0.712315] ehci_hcd 0000:00:1d.7: debug port 1 [ 0.716201] ehci_hcd 0000:00:1d.7: cache line size of 64 is not supported [ 0.716216] ehci_hcd 0000:00:1d.7: irq 23, io mem 0xf8904c00 [ 0.732014] ehci_hcd 0000:00:1d.7: USB 2.0 started, EHCI 1.00 [ 0.732130] hub 2-0:1.0: USB hub found [ 0.732135] hub 2-0:1.0: 6 ports detected [ 0.732209] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver [ 0.732223] uhci_hcd: USB Universal Host Controller Interface driver [ 0.732254] uhci_hcd 0000:00:1a.0: PCI INT A -> GSI 20 (level, low) -> IRQ 20 [ 0.732262] uhci_hcd 0000:00:1a.0: setting latency timer to 64 [ 0.732265] uhci_hcd 0000:00:1a.0: UHCI Host Controller [ 0.732298] uhci_hcd 0000:00:1a.0: new USB bus registered, assigned bus number 3 [ 0.732325] uhci_hcd 0000:00:1a.0: irq 20, io base 0x00001820 [ 0.732441] hub 3-0:1.0: USB hub found [ 0.732445] hub 3-0:1.0: 2 ports detected [ 0.732508] uhci_hcd 0000:00:1a.1: PCI INT B -> GSI 20 (level, low) -> IRQ 20 [ 0.732514] uhci_hcd 0000:00:1a.1: setting latency timer to 64 [ 0.732518] uhci_hcd 0000:00:1a.1: UHCI Host Controller [ 0.732553] uhci_hcd 0000:00:1a.1: new USB bus registered, assigned bus number 4 [ 0.732577] uhci_hcd 0000:00:1a.1: irq 20, io base 0x00001840 [ 0.732696] hub 4-0:1.0: USB hub found [ 0.732700] hub 4-0:1.0: 2 ports detected [ 0.732762] uhci_hcd 0000:00:1a.2: PCI INT C -> GSI 20 (level, low) -> IRQ 20 [ 0.732768] uhci_hcd 0000:00:1a.2: setting latency timer to 64 [ 0.732772] uhci_hcd 0000:00:1a.2: UHCI Host Controller [ 0.732805] uhci_hcd 0000:00:1a.2: new USB bus registered, assigned bus number 5 [ 0.732829] uhci_hcd 0000:00:1a.2: irq 20, io base 0x00001860 [ 0.732942] hub 5-0:1.0: USB hub found [ 0.732946] hub 5-0:1.0: 2 ports detected [ 0.733007] uhci_hcd 0000:00:1d.0: PCI INT A -> GSI 23 (level, low) -> IRQ 23 [ 0.733014] uhci_hcd 0000:00:1d.0: setting latency timer to 64 [ 0.733017] uhci_hcd 0000:00:1d.0: UHCI Host Controller [ 0.733057] uhci_hcd 0000:00:1d.0: new USB bus registered, assigned bus number 6 [ 0.733082] uhci_hcd 0000:00:1d.0: irq 23, io base 0x00001880 [ 0.733202] hub 6-0:1.0: USB hub found [ 0.733206] hub 6-0:1.0: 2 ports detected [ 0.733265] uhci_hcd 0000:00:1d.1: PCI INT B -> GSI 17 (level, low) -> IRQ 17 [ 0.733273] uhci_hcd 0000:00:1d.1: setting latency timer to 64 [ 0.733276] uhci_hcd 0000:00:1d.1: UHCI Host Controller [ 0.733313] uhci_hcd 0000:00:1d.1: new USB bus registered, assigned bus number 7 [ 0.733351] uhci_hcd 0000:00:1d.1: irq 17, io base 0x000018a0 [ 0.733466] hub 7-0:1.0: USB hub found [ 0.733470] hub 7-0:1.0: 2 ports detected [ 0.733532] uhci_hcd 0000:00:1d.2: PCI INT C -> GSI 18 (level, low) -> IRQ 18 [ 0.733539] uhci_hcd 0000:00:1d.2: setting latency timer to 64 [ 0.733542] uhci_hcd 0000:00:1d.2: UHCI Host Controller [ 0.733578] uhci_hcd 0000:00:1d.2: new USB bus registered, assigned bus number 8 [ 0.733610] uhci_hcd 0000:00:1d.2: irq 18, io base 0x000018c0 [ 0.733730] hub 8-0:1.0: USB hub found [ 0.733736] hub 8-0:1.0: 2 ports detected [ 0.733843] i8042: PNP: PS/2 Controller [PNP0303:KBD0,PNP0f13:PS2M] at 0x60,0x64 irq 1,12 [ 0.751594] serio: i8042 KBD port at 0x60,0x64 irq 1 [ 0.751605] serio: i8042 AUX port at 0x60,0x64 irq 12 [ 0.751732] mousedev: PS/2 mouse device common for all mice [ 0.752670] rtc_cmos 00:08: RTC can wake from S4 [ 0.752770] rtc_cmos 00:08: rtc core: registered rtc_cmos as rtc0 [ 0.752796] rtc0: alarms up to one month, y3k, 242 bytes nvram, hpet irqs [ 0.752907] device-mapper: uevent: version 1.0.3 [ 0.752976] device-mapper: ioctl: 4.20.0-ioctl (2011-02-02) initialised: [email protected] [ 0.753028] cpuidle: using governor ladder [ 0.753093] cpuidle: using governor menu [ 0.753096] EFI Variables Facility v0.08 2004-May-17 [ 0.753361] TCP cubic registered [ 0.753482] NET: Registered protocol family 10 [ 0.753966] NET: Registered protocol family 17 [ 0.753992] Registering the dns_resolver key type [ 0.754113] PM: Hibernation image not present or could not be loaded. [ 0.754131] registered taskstats version 1 [ 0.771553] Magic number: 15:152:507 [ 0.771667] rtc_cmos 00:08: setting system clock to 2011-10-22 00:30:48 UTC (1319243448) [ 0.772238] BIOS EDD facility v0.16 2004-Jun-25, 0 devices found [ 0.772240] EDD information not available. [ 0.774165] Freeing unused kernel memory: 984k freed [ 0.774504] Write protecting the kernel read-only data: 10240k [ 0.774755] Freeing unused kernel memory: 20k freed [ 0.775093] input: AT Translated Set 2 keyboard as /devices/platform/i8042/serio0/input/input3 [ 0.779727] Freeing unused kernel memory: 1400k freed [ 0.801946] udevd[84]: starting version 173 [ 0.880950] sky2: driver version 1.28 [ 0.881046] sky2 0000:02:00.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16 [ 0.881096] sky2 0000:02:00.0: setting latency timer to 64 [ 0.881197] sky2 0000:02:00.0: Yukon-2 Extreme chip revision 2 [ 0.881871] sky2 0000:02:00.0: irq 45 for MSI/MSI-X [ 0.896273] sky2 0000:02:00.0: eth0: addr 00:1d:72:ec:76:d5 [ 0.910630] ahci 0000:00:1f.2: version 3.0 [ 0.910647] ahci 0000:00:1f.2: PCI INT B -> GSI 19 (level, low) -> IRQ 19 [ 0.910710] ahci 0000:00:1f.2: irq 46 for MSI/MSI-X [ 0.910775] ahci: SSS flag set, parallel bus scan disabled [ 0.910812] ahci 0000:00:1f.2: AHCI 0001.0200 32 slots 4 ports 3 Gbps 0x33 impl SATA mode [ 0.910816] ahci 0000:00:1f.2: flags: 64bit ncq sntf stag pm led clo pio slum part ccc ems sxs [ 0.910821] ahci 0000:00:1f.2: setting latency timer to 64 [ 0.941773] scsi0 : ahci [ 0.941954] scsi1 : ahci [ 0.942038] scsi2 : ahci [ 0.942118] scsi3 : ahci [ 0.942196] scsi4 : ahci [ 0.942268] scsi5 : ahci [ 0.942332] ata1: SATA max UDMA/133 abar m2048@0xf8904000 port 0xf8904100 irq 46 [ 0.942336] ata2: SATA max UDMA/133 abar m2048@0xf8904000 port 0xf8904180 irq 46 [ 0.942339] ata3: DUMMY [ 0.942340] ata4: DUMMY [ 0.942344] ata5: SATA max UDMA/133 abar m2048@0xf8904000 port 0xf8904300 irq 46 [ 0.942347] ata6: SATA max UDMA/133 abar m2048@0xf8904000 port 0xf8904380 irq 46 [ 1.028061] usb 1-5: new high speed USB device number 2 using ehci_hcd [ 1.181775] usbcore: registered new interface driver uas [ 1.260062] ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300) [ 1.261126] ata1.00: ATA-8: Hitachi HTS543225L9A300, FBEOC40C, max UDMA/133 [ 1.261129] ata1.00: 488397168 sectors, multi 16: LBA48 NCQ (depth 31/32), AA [ 1.262360] ata1.00: configured for UDMA/133 [ 1.262518] scsi 0:0:0:0: Direct-Access ATA Hitachi HTS54322 FBEO PQ: 0 ANSI: 5 [ 1.262716] sd 0:0:0:0: Attached scsi generic sg0 type 0 [ 1.262762] sd 0:0:0:0: [sda] 488397168 512-byte logical blocks: (250 GB/232 GiB) [ 1.262824] sd 0:0:0:0: [sda] Write Protect is off [ 1.262827] sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00 [ 1.262851] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA [ 1.287277] sda: sda1 sda2 sda3 [ 1.287693] sd 0:0:0:0: [sda] Attached SCSI disk [ 1.580059] ata2: SATA link up 1.5 Gbps (SStatus 113 SControl 300) [ 1.581188] ata2.00: ATAPI: HL-DT-STDVDRAM GT10N, 1.00, max UDMA/100 [ 1.582663] ata2.00: configured for UDMA/100 [ 1.584162] scsi 1:0:0:0: CD-ROM HL-DT-ST DVDRAM GT10N 1.00 PQ: 0 ANSI: 5 [ 1.585821] sr0: scsi3-mmc drive: 24x/24x writer dvd-ram cd/rw xa/form2 cdda tray [ 1.585824] cdrom: Uniform CD-ROM driver Revision: 3.20 [ 1.585953] sr 1:0:0:0: Attached scsi CD-ROM sr0 [ 1.586038] sr 1:0:0:0: Attached scsi generic sg1 type 5 [ 1.632061] usb 6-1: new low speed USB device number 2 using uhci_hcd [ 1.908056] ata5: SATA link down (SStatus 0 SControl 300) [ 2.228065] ata6: SATA link down (SStatus 0 SControl 300) [ 2.228955] Initializing USB Mass Storage driver... [ 2.229052] usbcore: registered new interface driver usb-storage [ 2.229054] USB Mass Storage support registered. [ 2.235827] scsi6 : usb-storage 1-5:1.0 [ 2.235987] usbcore: registered new interface driver ums-realtek [ 2.244451] input: B16_b_02 USB-PS/2 Optical Mouse as /devices/pci0000:00/0000:00:1d.0/usb6/6-1/6-1:1.0/input/input4 [ 2.244598] generic-usb 0003:046D:C025.0001: input,hidraw0: USB HID v1.10 Mouse [B16_b_02 USB-PS/2 Optical Mouse] on usb-0000:00:1d.0-1/input0 [ 2.244620] usbcore: registered new interface driver usbhid [ 2.244622] usbhid: USB HID core driver [ 3.091083] EXT4-fs (loop0): mounted filesystem with ordered data mode. Opts: (null) [ 3.238275] scsi 6:0:0:0: Direct-Access Generic- Multi-Card 1.00 PQ: 0 ANSI: 0 CCS [ 3.348261] sd 6:0:0:0: Attached scsi generic sg2 type 0 [ 3.351897] sd 6:0:0:0: [sdb] Attached SCSI removable disk [ 47.138012] udevd[334]: starting version 173 [ 47.177678] lp: driver loaded but no devices found [ 47.197084] wmi: Mapper loaded [ 47.197526] acer_wmi: Acer Laptop ACPI-WMI Extras [ 47.210227] acer_wmi: Brightness must be controlled by generic video driver [ 47.566578] Disabling lock debugging due to kernel taint [ 47.584050] ndiswrapper version 1.56 loaded (smp=yes, preempt=no) [ 47.620666] type=1400 audit(1319239895.347:2): apparmor="STATUS" operation="profile_load" name="/sbin/dhclient" pid=624 comm="apparmor_parser" [ 47.620934] type=1400 audit(1319239895.347:3): apparmor="STATUS" operation="profile_load" name="/usr/lib/NetworkManager/nm-dhcp-client.action" pid=624 comm="apparmor_parser" [ 47.621108] type=1400 audit(1319239895.347:4): apparmor="STATUS" operation="profile_load" name="/usr/lib/connman/scripts/dhclient-script" pid=624 comm="apparmor_parser" [ 47.633056] [drm] Initialized drm 1.1.0 20060810 [ 47.722594] i915 0000:00:02.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16 [ 47.722602] i915 0000:00:02.0: setting latency timer to 64 [ 47.807152] ndiswrapper (check_nt_hdr:141): kernel is 64-bit, but Windows driver is not 64-bit;bad magic: 010B [ 47.807159] ndiswrapper (load_sys_files:206): couldn't prepare driver 'rt2860' [ 47.807930] ndiswrapper (load_wrap_driver:108): couldn't load driver rt2860; check system log for messages from 'loadndisdriver' [ 47.856250] usbcore: registered new interface driver ndiswrapper [ 47.861772] i915 0000:00:02.0: irq 47 for MSI/MSI-X [ 47.861781] [drm] Supports vblank timestamp caching Rev 1 (10.10.2010). [ 47.861783] [drm] Driver supports precise vblank timestamp query. [ 47.861842] vgaarb: device changed decodes: PCI:0000:00:02.0,olddecodes=io+mem,decodes=io+mem:owns=io+mem [ 47.980620] fixme: max PWM is zero. [ 48.286153] fbcon: inteldrmfb (fb0) is primary device [ 48.287033] Console: switching to colour frame buffer device 170x48 [ 48.287062] fb0: inteldrmfb frame buffer device [ 48.287064] drm: registered panic notifier [ 48.333883] acpi device:02: registered as cooling_device2 [ 48.334053] input: Video Bus as /devices/LNXSYSTM:00/device:00/PNP0A08:00/LNXVIDEO:00/input/input5 [ 48.334128] ACPI: Video Device [GFX0] (multi-head: yes rom: no post: no) [ 48.334203] [drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on minor 0 [ 48.334644] HDA Intel 0000:00:1b.0: power state changed by ACPI to D0 [ 48.334652] HDA Intel 0000:00:1b.0: power state changed by ACPI to D0 [ 48.334673] HDA Intel 0000:00:1b.0: PCI INT A -> GSI 21 (level, low) -> IRQ 21 [ 48.334737] HDA Intel 0000:00:1b.0: irq 48 for MSI/MSI-X [ 48.334772] HDA Intel 0000:00:1b.0: setting latency timer to 64 [ 48.356107] Adding 261116k swap on /host/ubuntu/disks/swap.disk. Priority:-1 extents:1 across:261116k [ 48.380946] hda_codec: ALC268: BIOS auto-probing. [ 48.390242] input: HDA Intel Mic as /devices/pci0000:00/0000:00:1b.0/sound/card0/input6 [ 48.390365] input: HDA Intel Headphone as /devices/pci0000:00/0000:00:1b.0/sound/card0/input7 [ 48.490870] EXT4-fs (loop0): re-mounted. Opts: errors=remount-ro,user_xattr [ 48.917990] ppdev: user-space parallel port driver [ 48.950729] type=1400 audit(1319239896.675:5): apparmor="STATUS" operation="profile_load" name="/usr/lib/cups/backend/cups-pdf" pid=941 comm="apparmor_parser" [ 48.951114] type=1400 audit(1319239896.675:6): apparmor="STATUS" operation="profile_load" name="/usr/sbin/cupsd" pid=941 comm="apparmor_parser" [ 48.977706] Synaptics Touchpad, model: 1, fw: 7.2, id: 0x1c0b1, caps: 0xd04733/0xa44000/0xa0000 [ 49.048871] input: SynPS/2 Synaptics TouchPad as /devices/platform/i8042/serio1/input/input8 [ 49.078713] sky2 0000:02:00.0: eth0: enabling interface [ 49.079462] ADDRCONF(NETDEV_UP): eth0: link is not ready [ 50.762266] sky2 0000:02:00.0: eth0: Link is up at 100 Mbps, full duplex, flow control rx [ 50.762702] ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready [ 54.751478] type=1400 audit(1319239902.475:7): apparmor="STATUS" operation="profile_load" name="/usr/lib/lightdm/lightdm-guest-session-wrapper" pid=1039 comm="apparmor_parser" [ 54.755907] type=1400 audit(1319239902.479:8): apparmor="STATUS" operation="profile_replace" name="/sbin/dhclient" pid=1040 comm="apparmor_parser" [ 54.756237] type=1400 audit(1319239902.483:9): apparmor="STATUS" operation="profile_replace" name="/usr/lib/NetworkManager/nm-dhcp-client.action" pid=1040 comm="apparmor_parser" [ 54.756417] type=1400 audit(1319239902.483:10): apparmor="STATUS" operation="profile_replace" name="/usr/lib/connman/scripts/dhclient-script" pid=1040 comm="apparmor_parser" [ 54.764825] type=1400 audit(1319239902.491:11): apparmor="STATUS" operation="profile_load" name="/usr/bin/evince" pid=1041 comm="apparmor_parser" [ 54.768365] type=1400 audit(1319239902.495:12): apparmor="STATUS" operation="profile_load" name="/usr/bin/evince-previewer" pid=1041 comm="apparmor_parser" [ 54.770601] type=1400 audit(1319239902.495:13): apparmor="STATUS" operation="profile_load" name="/usr/bin/evince-thumbnailer" pid=1041 comm="apparmor_parser" [ 54.770729] type=1400 audit(1319239902.495:14): apparmor="STATUS" operation="profile_load" name="/usr/share/gdm/guest-session/Xsession" pid=1038 comm="apparmor_parser" [ 54.775181] type=1400 audit(1319239902.499:15): apparmor="STATUS" operation="profile_load" name="/usr/lib/telepathy/mission-control-5" pid=1043 comm="apparmor_parser" [ 54.775533] type=1400 audit(1319239902.499:16): apparmor="STATUS" operation="profile_load" name="/usr/lib/telepathy/telepathy-*" pid=1043 comm="apparmor_parser" [ 54.936691] init: failsafe main process (891) killed by TERM signal [ 54.944583] init: apport pre-start process (1096) terminated with status 1 [ 55.000373] init: apport post-stop process (1160) terminated with status 1 [ 55.005291] init: gdm main process (1159) killed by TERM signal [ 59.782579] EXT4-fs (loop0): re-mounted. Opts: errors=remount-ro,user_xattr,commit=0 [ 60.992021] eth0: no IPv6 routers present [ 61.936072] device eth0 entered promiscuous mode [ 62.053949] Bluetooth: Core ver 2.16 [ 62.054005] NET: Registered protocol family 31 [ 62.054007] Bluetooth: HCI device and connection manager initialized [ 62.054010] Bluetooth: HCI socket layer initialized [ 62.054012] Bluetooth: L2CAP socket layer initialized [ 62.054993] Bluetooth: SCO socket layer initialized [ 62.058750] Bluetooth: RFCOMM TTY layer initialized [ 62.058758] Bluetooth: RFCOMM socket layer initialized [ 62.058760] Bluetooth: RFCOMM ver 1.11 [ 62.059428] Bluetooth: BNEP (Ethernet Emulation) ver 1.3 [ 62.059432] Bluetooth: BNEP filters: protocol multicast [ 62.460389] init: plymouth-stop pre-start process (1662) terminated with status 1 '

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• Upcoming User Group Events in 2011

  - by john.orourke(at)oracle.com

  At a recent customer event, someone asked me if Oracle had any plans to re-create the Hyperion Solutions Conference.  Unfortunately the answer is no.  With so many different product lines it would be challenging and costly for Oracle to run separate user conferences for every product line, and it would create too many events for customers with multiple products to attend.  So Oracle Open World is the company's main event for showcasing what's new and what's coming across all product lines.  If customers find Oracle OpenWorld too overwhelming or if the timing is bad, there are a number of other conferences, which are run by Oracle user groups and include a number of sessions focused on Oracle Hyperion EPM and BI products.  Here's a sneak preview of what's coming up for conferences in 2011 where you can network with other Hyperion users and learn what's new and what's coming in our products. Alliance 2011:  This conference is run by the Oracle Higher Education User Group (HEUG).  It's being held March 27 - 30th in lovely Denver, Colorado.  (a great location and time for skiers!)  This event is targeted at customers in Higher Education and Public Sector organizations and is expecting to draw over 3,500 attendees.  There will be a number of sessions focusing on Oracle Hyperion EPM and BI products in the Budgeting track, as well as the Reporting & BI track.  This includes product-focused sessions delivered by Oracle and partners, as well as case studies delivered by customers.  Here's a link to the registration page where you can get more information: http://www.heug.org/p/cm/ld/fid=255 Collaborate 2011:  This conference is run by three different user groups;  OAUG, IOUG and Quest.  It's being held April 10 - 14th in sunny Orlando, Florida.  (yes, sunshine and warmth!)  This event is targeted to customers with Oracle E-Business Suite, PeopleSoft, JD Edwards, Hyperion, Primavera and other products and is expected to draw over 5,000 attendees.  You'll find a number of sessions focused on Oracle Hyperion EPM and BI products in the BI/Data Warehousing/EPM track.  This includes product-focused sessions delivered by Oracle, our partners, and customers as well as a number of customer case studies.  There will also be an exhibit area with a number of demo pods focused on EPM and BI products.  Here's a link to the conference web site where you can get more information: http://collaborate.oaug.org/ Also, please note that the OAUG has a Hyperion SIG that runs focused EPM/Hyperion events throughout the year.  Here's a link to their web site where you can get more information: http://hyperionsig.oaug.org/ Kscope 2011:  Formerly the Kaleidoscope conference, this one is run by the Oracle Developer Tools User Group (ODTUG).  This conference is being held June 26 - 30th in Long Beach, CA. (surf's up!)  Historically, this event has focused on Oracle Development tools, but over the past few years the EPM and BI content has grown with over 100 sessions planned this year.  So this event is becoming a great venue for existing Hyperion customers to learn about the latest developments with Oracle Essbase, Hyperion Planning, Hyperion Financial Management, Oracle BI and other products.   You'll also find hands-on workshops, product demonstrations as well as EPM and BI Symposiums run by Oracle Development staff.  Here's a link to the web site where you can get more details.  http://www.kscope11.com/biepm UKOUG Conference Series:  EPM and Hyperion 2011:  For Hyperion customers in the UK, the UKOUG has a Hyperion SIG that runs a focused conference for EPM and Hyperion products.  The 2011 event is planned for June in London.  Here's a link to the web site for this event where you can get more information: http://hyperion.ukoug.org/default.asp?p=8461 In addition to these conferences, you can also find Oracle EPM and BI content at regional user group meetings globally as well as Marketing events run by Oracle.  Check the events page at www.oracle.com for the details on upcoming Marketing and regional User Group events.  So while Oracle will not be trying to replicate the Hyperion Solutions conference, the good news is that there are a number of other events available where customers can find out what's new and what's coming with Oracle EPM and BI products.  And these events are running at different times of the year in different locations - so you can pick the event that makes the most sense for your company from a timing and location standpoint. I'll be delivering a number of sessions at the Alliance and Collaborate conferences and hope to see many of our loyal customers and partners at these events.  And there's always Oracle OpenWorld coming up in October, for which the planning has already started.  I look forward to seeing you in 2011.

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• Platformer gravity where gravity is greater than tile size

  - by Sara

  I am making a simple grid-tile-based platformer with basic physics. I have 16px tiles, and after playing with gravity it seems that to get a nice quick Mario-like jump feel, the player ends up moving faster than 16px per second at the ground. The problem is that they clip through the first layer of tiles before collisions being detected. Then when I move the player to the top of the colliding tile, they move to the bottom-most tile. I have tried limiting their maximum velocity to be less than 16px but it does not look right. Are there any standard approaches to solving this? Thanks.

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• Cumulative Update packages for SQL Server 2008 are available now: CU7 for SQL2008 SP2 and CU2 for SQL2008 SP3

  - by ssqa.net

  Another instalment of Cumulative Update package for SQL Server 2008 SP3 is available now, which is CU2 and the build number is known as 10.00.5768.00. As usual this CU2 for SQL2008 SP3 contains hotfixes for issues that were fixed after the release of SQL Server 2008 Service Pack 3 (SP3). KBA2633143 list the following article numbers about more information on the fixes: VSTS bug number KB article number Description 794387 2522893 (http://support.microsoft.com/kb/2522893/ ) FIX: A backup operation...(read more)

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• Is code that terminates on a random condition guaranteed to terminate?

  - by Simon Campbell

  If I had a code which terminated based on if a random number generator returned a result (as follows), would it be 100% certain that the code would terminate if it was allowed to run forever. while (random(MAX_NUMBER) != 0): // random returns a random number between 0 and MAX_NUMBER print('Hello World') I am also interested in any distinctions between purely random and the deterministic random that computers generally use. Assume the seed is not able to be known in the case of the deterministic random. Naively it could be suggested that the code will exit, after all every number has some possibility and all of time for that possibility to be exercised. On the other hand it could be argued that there is the random chance it may not ever meet the exit condition-- the generator could generate 1 'randomly' until infinity. (I suppose one would question the validity of the random number generator if it was a deterministic generator returning only 1's 'randomly' though)

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• How can I generate a navigation mesh for a tile grid?

  - by Roflha

  I haven't actually started programming for this one yet, but I wanted to see how I would go about doing this anyway. Say I have a grid of tiles, all of the same size, some traversable and some not. How would I go about creating a navigation mesh of polygons from this grid? My idea was to take the non-traversable tiles out and extend lines from there edges to make polygons... that's all I have got so far. Any advice?

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• Informing Googlebot for deprecated pages

  - by trante

  I publish timetables in my website. For example last year I published Number 2 bus Summer 2013 timetable. I has pretty good ranking on Google SERPs for number 2 bus timetable But this year I added a new page with the name "Number 2 bus Summer 2014 timetable". When users search number 2 bus timetable in Google, they find 2013 timetable in first page of SERPs. But I want them to find 2014 timetable. Thy can reach 2014 page with the keywords number 2 bus timetable 2014. But most of the users doesn't write year name. So what's the proper way to say Googlebot that 2013 page is deprecated and newer version is 2014 page ? I created a link from 2013 page to 2013 page and added a deprecation alert for visitors. But I still see 2013 timetable in first page of Google SERPs. Of course it is possible to 301 redirect, 2013 page to 2014 page. But I want users to reach old pages to compare the differences between years. (As you would guess I have many pages like this.) Edit: Why I don't put timetables on same page and show different years' timetables with sorting. Because my old pages has good pagerank scores or SERPs. Removing these old page will remove them.

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• How to use Object Type Converter

  - by arun.x.sridharan(at)oracle.com

  UseCase Description A person form where in user will enter String which has to be converted to Number while persisting. From the User Interface we might be getting a String value which has to be persisted in the database as a number in that scenario we can use converters to map the java object which is of type String to its database value which is a Number. For example , there is a 'Person' table in database which is used to store the user details passed from the User Interface. It has a 'Status' column which is of the value  Number. But from the User Interface String values (Active/InActive) are passed . For persisting the user details we can use Object type converter and provide the mappings for status column corresponding to the String values. Object type converter can be used if you wanted to have a mapping for a field for example when departmentName on the entity was of String value and mapped to dept_name field on the database table which is of the value NUMBER.   Implementation steps Sample EJB API for setting the value of status on Person Entity as a String     public void createPerson(String status,String firstName,String lastName) {                Person person = new Person();                // status will be set as a String value received from the User Interface         person.setStatus(status);                person.setFirstname(firstName);        person.setLastname(lastName);                persistPerson(person);         } In the sample code shown above status is passed as a String, this has to be converted to Number. The String value obtained will be set on Person object and persistPerson API will be called for creating a new person from the values passed from the User Interface.  Steps to configure Object type converter: 1. Navigate to Person Entity from persistence.xml and navigate to status field2. Click on Conversion tab and select Converted check box3. Select Object Type Converter radio button and set the Data Type Class to      java.math.BigDecimal and Object Type Class to java.lang.String4. Specify the conversion values for all the values that can be passed from the user interface  as shown below5. Set the Default Object value

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• 2D pathfinding - finding smooth paths

  - by Kooi Nam Ng

  I was trying to implement a simple pathfinding, but the outcome is less satisfactory than what I intended to achieve. The thing is units in games like Starcraft 2 move in all directions whereas units in my case only move in at most 8 directions (Warcraft 1 style) as these 8 directions direct to next available nodes (they move from a tile to next neighboring tile). What should I do in order to achieve the result as in Starcraft 2? Shrink the tile size? On the picture you can see a horizontal line of rock tiles being obstacles, and the found path marked as green tiles. The red line is the path I want to achieve.

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• Understanding binary numbers in terms of real world objects

  - by Kaushik

  When I represent a number in the decimal system, I have an intuitive knowledge of what it amounts to. For example take the number '10': I understand that it means 10 apples or 10 people... i.e I can count in the real world. But as soon as the number is converted to any other system, this understanding no longer applies. For example 10 when converted to binary will be 1010...now what does this represent? Is there a way to understand this number 1010 in terms of counting objects in the real world?

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• Unity GUI not in build, but works fine in editor

  - by Darren

  I have: GUITexture attached to an object A script that has GUIStyles created for the Textfield and Buttons that are created in OnGUI(). This script is attached to the same object in number 1 3 GUIText objects each separate from the above. A script that enables the GUITexture and the script in number 1 and 2 respectively This is how it is supposed to work: When I cross the finish line, number 4 script enables number 1 GUITexture component and number 2 script component. The script component uses one of number 3's GUIText objects to show you your best lap time, and also makes a GUI.Textfield for name entry and 2 GUI.Buttons for "Submit" and "Skip". If you hit "Submit" the script will submit the time. No matter which button you press, The remaining 2 GUIText objects from number 3 will show you the top 10 best times. For some reason, when I run it in editor, everything works 100%, but when I'm in different kinds of builds, the results vary. When I am in a webplayer, The GUITexture and the textfield and buttons appear, but the textfield and buttons are plain and have no evidence of GUIStyles. When I click one of the buttons, the score gets submitted but I do not get the fastest times showing. When I am in a standalone build, the GUITexture shows up, but nothing else does. If I remove the GUIStyle parameter of the GUI.Textfield and GUI.Button, they show up. Why am I getting these variations and how can I fix it? Code below: void Start () { Names.text = ""; Times.text = ""; YourBestTime.text = "Your Best Lap: " + bestTime + "\nEnter your name:"; //StartCoroutine(GetTimes("Test")); } void Update() { if (!ShowButtons && !GettingTimes) { StartCoroutine(GetTimes()); GettingTimes = true; } } IEnumerator GetTimes () { Debug.Log("Getting times"); YourBestTime.text = "Loading Best Lap Times"; WWW times_get = new WWW(GetTimesUrl); yield return times_get; WWW names_get = new WWW(GetNamesUrl); yield return names_get; if(times_get.error != null || names_get.error != null) { print("There was an error retrieiving the data: " + names_get.error + times_get.error); } else { Times.text = times_get.text; Names.text = names_get.text; YourBestTime.text = "Your Best Lap: " + bestTime; } } IEnumerator PostLapTime (string Name, string LapTime) { string hash= MD5.Md5Sum(Name + LapTime + secretKey); string bestTime_url = SubmitTimeUrl + "&Name=" + WWW.EscapeURL(Name) + "&LapTime=" + LapTime + "&hash=" + hash; Debug.Log (bestTime_url); // Post the URL to the site and create a download object to get the result. WWW hs_post = new WWW(bestTime_url); //label = "Submitting..."; yield return hs_post; // Wait until the download is done if (hs_post.error != null) { print("There was an error posting the lap time: " + hs_post.error); //label = "Error: " + hs_post.error; //show = false; } else { Debug.Log("Posted: " + hs_post.text); ShowButtons = false; PostingTime = false; } } void OnGUI() { if (ShowButtons) { //makes text box nameString = GUI.TextField( new Rect((Screen.width/2)-111, (Screen.height/2)-130, 222, 25), nameString, 20, TextboxStyle); if (GUI.Button( new Rect( (Screen.width/2-74.0f), (Screen.height/2)- 90, 64, 32), "Submit", ButtonStyle)) { //SUBMIT TIME if (nameString == "") { nameString = "Player"; } if (!PostingTime) { StartCoroutine(PostLapTime(nameString, bestTime)); PostingTime = true; } } else if (GUI.Button( new Rect( (Screen.width/2+10.0f), (Screen.height/2)- 90, 64, 32), "Skip", ButtonStyle)) { ShowButtons = false; } } } }

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• LightSwitch Tutorial - Adding Image to a LightSwitch Screen

  - by ChrisD

  Last week, I have discussed how to control Screen Layouts in LightSwitch. Now, I will talk about how to add an image to the LightSwitch screen. In this demo, I will try to upload the image to the screen and will save the image into the database. The first step we need to do is start the VS 2010, create LightSwitch Desktop application with the name “AddingImageIntoScreenInLSBeta2” as shown in the following figure. The second steps, create a table as shown in the screen by selecting the "create a table" option in the start up screen. Then, we need to add a New Data Screen to our demo application. See the following figure which is the default screen layouts for the screen we have created. So we have to change the layout of this screen so that the uploading and using the image in the screen can be easily explained. Before adding the Model Window we have to prepare the layout. So delete the Highlighted fields as shown in the above figure. After preparing the layout to add the image, just add a new Group to the Person Property Rows Layout. To add a new group, [No: 1] – Select the Rows layout, it will shows you the Add button. [No: 2] – Click the Add button to select the new group. [No: 3] – Select the New Group. After adding the new group change the Layout type to Columns Layout. Here, -          Change the rows layout to columns layouts and give the display name as Uploading Image Example. -          Click on the add button to add the Photo field under the column layout. Add a new group under the Column layout group. Follow the [No: #] to create a new group under the columns layout group. After adding a new group of rows layout add the fields to the newly created group. [No: 1] – Select the Rows Layout group and change the display name as Details. [No: 2] – Click on Add button to select the appropriate fields to add to the group. [No: 3] – Add the fields to the group The above snippet shows the complete layout tree for our screen. Now the screen for uploading the image is ready. Just press the Play button. And see the result.

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