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  • Coding different states in Adventure Games

    - by Cardin
    I'm planning out an adventure game, and can't figure out what's the right way to implement the behaviour of a level depending on state of story progression. My single-player game features a huge world where the player has to interact with people in a town at various points in the game. However, depending on story progression, different things would be presented to the player, for e.g. the Guild Leader will change locations from the town square to various locations around the city; Doors would only unlock at certain times of the day after finishing a particular routine; Different cut-screen/trigger events happen only after a particular milestone has been reached. I naively thought of using a switch{} statement initially to decide what the NPC should say or which he could be found at, and making quest objectives interact-able only after checking a global game_state variable's condition. But I realised I would quickly run into a lot of different game states and switch-cases in order to change the behaviour of an object. That switch statement would also be massively hard to debug, and I guess it might also be hard to use in a level editor. So I thought, instead of having a single object with multiple states, maybe I should have multiple instances of the same object, with a single state. That way, if I use something like a level editor, I can put an instance of the NPC at all the different locations he could ever appear at, and also an instance for each conversation state he has. But that means there'll be a lot of inactive, invisible game objects floating around the level, which might be trouble for memory, or simply hard to see in a level editor, i don't know. Or simply, make an identical, but separate level for each game state. This feels the cleanest and bug-free way to do things, but it feels like massive manual work making sure each version of the level is really identical to each other. All my methods feel so inefficient, so to recap my question, is there a better or standardised way to implement behaviour of a level depending on state of story progression? PS: I don't have a level editor yet - thinking of using something like JME SDK or making my own.

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  • Reduce Repetitive Initialization Code in C++ Applications by Using Delegating Constructors

    You're often required to repeat identical pieces of initialization code in every constructor of a class that declares multiple constructors. That's because unlike a few other programming languages, The C++ programming language doesn't allow a constructor to call another constructor of the same class. Luckily, this problem is about to disappear with the recent approval of a new C++0x feature called delegating constructors which are explained in this C++ tutorial.

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  • Automating deployments with the SQL Compare command line

    - by Jonathan Hickford
    In my previous article, “Five Tips to Get Your Organisation Releasing Software Frequently” I looked at how teams can automate processes to speed up release frequency. In this post, I’m looking specifically at automating deployments using the SQL Compare command line. SQL Compare compares SQL Server schemas and deploys the differences. It works very effectively in scenarios where only one deployment target is required – source and target databases are specified, compared, and a change script is automatically generated and applied. But if multiple targets exist, and pressure to increase the frequency of releases builds, this solution quickly becomes unwieldy.   This is where SQL Compare’s command line comes into its own. I’ve put together a PowerShell script that loops through the Servers table and pulls out the server and database, these are then passed to sqlcompare.exe to be used as target parameters. In the example the source database is a scripts folder, a folder structure of scripted-out database objects used by both SQL Source Control and SQL Compare. The script can easily be adapted to use schema snapshots.     -- Create a DeploymentTargets database and a Servers table CREATE DATABASE DeploymentTargets GO USE DeploymentTargets GO CREATE TABLE [dbo].[Servers]( [id] [int] IDENTITY(1,1) NOT NULL, [serverName] [nvarchar](50) NULL, [environment] [nvarchar](50) NULL, [databaseName] [nvarchar](50) NULL, CONSTRAINT [PK_Servers] PRIMARY KEY CLUSTERED ([id] ASC) ) GO -- Now insert your target server and database details INSERT INTO dbo.Servers ( serverName , environment , databaseName) VALUES ( N'myserverinstance' , N'myenvironment1' , N'mydb1') INSERT INTO dbo.Servers ( serverName , environment , databaseName) VALUES ( N'myserverinstance' , N'myenvironment2' , N'mydb2') Here’s the PowerShell script you can adapt for yourself as well. # We're holding the server names and database names that we want to deploy to in a database table. # We need to connect to that server to read these details $serverName = "" $databaseName = "DeploymentTargets" $authentication = "Integrated Security=SSPI" #$authentication = "User Id=xxx;PWD=xxx" # If you are using database authentication instead of Windows authentication. # Path to the scripts folder we want to deploy to the databases $scriptsPath = "SimpleTalk" # Path to SQLCompare.exe $SQLComparePath = "C:\Program Files (x86)\Red Gate\SQL Compare 10\sqlcompare.exe" # Create SQL connection string, and connection $ServerConnectionString = "Data Source=$serverName;Initial Catalog=$databaseName;$authentication" $ServerConnection = new-object system.data.SqlClient.SqlConnection($ServerConnectionString); # Create a Dataset to hold the DataTable $dataSet = new-object "System.Data.DataSet" "ServerList" # Create a query $query = "SET NOCOUNT ON;" $query += "SELECT serverName, environment, databaseName " $query += "FROM dbo.Servers; " # Create a DataAdapter to populate the DataSet with the results $dataAdapter = new-object "System.Data.SqlClient.SqlDataAdapter" ($query, $ServerConnection) $dataAdapter.Fill($dataSet) | Out-Null # Close the connection $ServerConnection.Close() # Populate the DataTable $dataTable = new-object "System.Data.DataTable" "Servers" $dataTable = $dataSet.Tables[0] #For every row in the DataTable $dataTable | FOREACH-OBJECT { "Server Name: $($_.serverName)" "Database Name: $($_.databaseName)" "Environment: $($_.environment)" # Compare the scripts folder to the database and synchronize the database to match # NB. Have set SQL Compare to abort on medium level warnings. $arguments = @("/scripts1:$($scriptsPath)", "/server2:$($_.serverName)", "/database2:$($_.databaseName)", "/AbortOnWarnings:Medium") # + @("/sync" ) # Commented out the 'sync' parameter for safety, write-host $arguments & $SQLComparePath $arguments "Exit Code: $LASTEXITCODE" # Some interesting variations # Check that every database matches a folder. # For example this might be a pre-deployment step to validate everything is at the same baseline state. # Or a post deployment script to validate the deployment worked. # An exit code of 0 means the databases are identical. # # $arguments = @("/scripts1:$($scriptsPath)", "/server2:$($_.serverName)", "/database2:$($_.databaseName)", "/Assertidentical") # Generate a report of the difference between the folder and each database. Generate a SQL update script for each database. # For example use this after the above to generate upgrade scripts for each database # Examine the warnings and the HTML diff report to understand how the script will change objects # #$arguments = @("/scripts1:$($scriptsPath)", "/server2:$($_.serverName)", "/database2:$($_.databaseName)", "/ScriptFile:update_$($_.environment+"_"+$_.databaseName).sql", "/report:update_$($_.environment+"_"+$_.databaseName).html" , "/reportType:Interactive", "/showWarnings", "/include:Identical") } It’s worth noting that the above example generates the deployment scripts dynamically. This approach should be problem-free for the vast majority of changes, but it is still good practice to review and test a pre-generated deployment script prior to deployment. An alternative approach would be to pre-generate a single deployment script using SQL Compare, and run this en masse to multiple targets programmatically using sqlcmd, or using a tool like SQL Multi Script.  You can use the /ScriptFile, /report, and /showWarnings flags to generate change scripts, difference reports and any warnings.  See the commented out example in the PowerShell: #$arguments = @("/scripts1:$($scriptsPath)", "/server2:$($_.serverName)", "/database2:$($_.databaseName)", "/ScriptFile:update_$($_.environment+"_"+$_.databaseName).sql", "/report:update_$($_.environment+"_"+$_.databaseName).html" , "/reportType:Interactive", "/showWarnings", "/include:Identical") There is a drawback of running a pre-generated deployment script; it assumes that a given database target hasn’t drifted from its expected state. Often there are (rightly or wrongly) many individuals within an organization who have permissions to alter the production database, and changes can therefore be made outside of the prescribed development processes. The consequence is that at deployment time, the applied script has been validated against a target that no longer represents reality. The solution here would be to add a check for drift prior to running the deployment script. This is achieved by using sqlcompare.exe to compare the target against the expected schema snapshot using the /Assertidentical flag. Should this return any differences (sqlcompare.exe Exit Code 79), a drift report is outputted instead of executing the deployment script.  See the commented out example. # $arguments = @("/scripts1:$($scriptsPath)", "/server2:$($_.serverName)", "/database2:$($_.databaseName)", "/Assertidentical") Any checks and processes that should be undertaken prior to a manual deployment, should also be happen during an automated deployment. You might think about triggering backups prior to deployment – even better, automate the verification of the backup too.   You can use SQL Compare’s command line interface along with PowerShell to automate multiple actions and checks that you need in your deployment process. Automation is a practical solution where multiple targets and a higher release cadence come into play. As we know, with great power comes great responsibility – responsibility to ensure that the necessary checks are made so deployments remain trouble-free.  (The code sample supplied in this post automates the simple dynamic deployment case – if you are considering more advanced automation, e.g. the drift checks, script generation, deploying to large numbers of targets and backup/verification, please email me at [email protected] for further script samples or if you have further questions)

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  • Best Practices of SEO Web Development

    Custom SEO Web Development is a bit of a misnomer. This is because all web development should be regarded as custom, as there are no two companies in existence that are identical. Here best practices... [Author: Patrick Perkins - Web Design and Development - April 28, 2010]

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  • SQL Server Substr Equivalent

    - by Derek D.
    The oracle function equivalent to the SQL Server function of Substr is: Substring. All spelled out. This function is actually identical to Oracle’s function.DECLARE @BaseString varchar(max)SET @BaseString = 'My grandmothers pillows are blue'SELECT SUBSTRING ( @BaseString -- The base string to extract from ,4 -- Start Position ,5 -- Length of Characters )The above query returns the value ‘grand’. Related Posts:»SQL Server Contains [...]

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  • Does 3d modeling software *choice used during asset creation affect performance at runtime

    - by user134143
    Does software used to create 3d assets (for game development specifically) have an impact on the efficiency of the program? In other words, is it possible to reduce the operating footprint of an application merely by utilizing alternative development software during production of 3d assets? If you use two different applications to create a 3 dimensional image of a box, can one of them result in better performance if aspects of the image are identical? I am attempting to get the information I need without causing unnecessary debate over specific software choice.

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  • Prop Up Your Commerce With the Organic SEO Services

    When you are about to appoint a professional company for SEO services, you should always prefer a business provider who will be of your business level and share comparable competence as your business. This is because having a business partner with the identical caliber will permit the two organizations to work reciprocally with each other with the matching commitment levels and high work ethics.

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  • SEO penalty for "duplicate" content when a site's also accessible via another domain name?

    - by tog22
    While testing searches for keywords on my site, I notice that a mirror of it at http://a8.8d.344a.static.theplanet.com/ sometimes appears at the top result rather than my primary domain. It looks like this is an alternative address for my server. Will the presence of identical content at this domain and at my primary domain result in a Google penalty? If so, what can I do about it? Thanks for any help...

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  • 2 Hard Drives.One Partition

    - by Nick
    I have two hard drives (One 500 GB and the other 750 GB). I would like to create a single partition which will include these 2 hard drives. I guess it works only with identical hard drives, correct me if I am wrong. I have these 2 drives at an old computer which I tuned and may turn it into a web server,so I'm going to install ubuntu on them. How can I make 2 or more hard drives behave as one in one partition?

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  • Does one's choice of 3d modeling software used during asset creation affect performance at runtime?

    - by user134143
    Does software used to create 3d assets (for game development specifically) have an impact on the efficiency of the program? In other words, is it possible to reduce the operating footprint of an application merely by utilizing alternative development software during production of 3d assets? If you use two different applications to create a 3-dimensional image of a box, can one of them result in better performance if aspects of the image are identical? I am attempting to get the information I need without causing unnecessary debate over specific software choice.

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  • Install Ubuntu Desktop from Ubuntu Mini?

    - by chilicuil
    I've installed Ubuntu 12.10 from PXE, using the linux & initrd.gz files and I'd like to update it to Ubuntu Desktop (with unity, the shopping len and everything in between). I've heard that I can do it by installing the 'ubuntu-deskop' meta package, however I wonder if anyone has actually done it and if that's enough to get an identical Ubuntu installation as if I had installed it with the LiveDvd. Thanks in advance.

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  • Toggle CNAME entries using PHP?

    - by skibulk
    Is it possible with PHP to dynamically toggle CNAME entries? For example I have two mirrors with media to be served on my website. Mirror 1 has a monthly bandwidth cap so upon reaching it I want to automatically toggle to mirror 2. I want to use CNAME because the resulting urls appear to be identical to search engines, an SEO friendly approach. If there are SEO friendly alternatives I'd like to hear them as well.

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  • Types in Lisp and Scheme

    - by user2054900
    I see now that Racket has types. At first glance it seems to be almost identical to Haskell typing. But is Lisp's CLOS covering some of the space Haskell types cover? Creating a very strict Haskell type and an object in any OO language seems vaguely similar. It's just that I've drunk some of the Haskell kool-aid and I'm totally paranoid that if I go down the Lisp road, I'll be screwed due to dynamic typing.

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  • Unique Content is the Best Way to Win the SEO Game

    It has always been the case that in the world of search engine optimisation content is king - well almost always and it affects search engine ranking. Gone are the days when you could saturate your website with keywords and hide them by using identical font and background colours. And you certainly cannot create articles with so many keywords that they don't actually make sense any more.

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  • How would one build a relational database on a key-value store, a-la Berkeley DB's SQL interface?

    - by coleifer
    I've been checking out Berkeley DB and was impressed to find that it supported a SQL interface that is "nearly identical" to SQLite. http://docs.oracle.com/cd/E17076_02/html/bdb-sql/dbsqlbasics.html#identicalusage I'm very curious, at a high-level, how this kind of interface might have been architected. For instance: since values are "transparent", how do you efficiently query and sort by value how are limits and offsets performed efficiently on large result sets how would the keys be structured and serialized for good average-case performance

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  • Rotate a vector relative to itself

    - by Paul Manta
    I have a plane defined by transform.forward and transform.right, with 0 degrees corresponding to the forward vector and positive 90 degrees to the right vector. How can I create a third vector rotated in this plane. A rotation of 0 degrees would mean the vector is identical to transform.forward, a rotation of 30 degrees would mean it forms a 30 degree angle with the forward vector. In other words, I want to rotate the forward vector relative to itself, in the plane it defines with the right vector.

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  • How do I prevent ISPs from killing downloads of files in mid-transfer?

    - by Gorchestopher H
    I run a small website with a few users, low traffic, mostly to share personal mp3 files with a small community. Depending on their ISP, my users can't always download or stream larger files. By larger I mean larger than 1MB. Essentially the host either stops sending, or the client stops receiving. One of the links along the connection chain simply ends its connection before the transfer completes Trace-route shows no connection issues. There are no connection issues with short transfers that don't take more than a few seconds. It's these 10 second transfers that just end up ending. Just doing a straight download with a direct link can yield this error if you have the wrong ISP. Strangely enough, this is most common with users with ISPs who are essentially independent providers that buy service via a fiber link. Unfortunately these providers aren't very knowledgeable, are unable to do any testing, and insist it's a problem with the host. I have gotten my host to transfer my site to different servers of their, to the same effect. Nearly identical sites (affiliate sites actually) experience no such issue. What can I be doing to further troubleshoot this matter? How can I prove that someone is dropping the ball, and identify who that party is? Can I do a 5Mb traceroute? EDIT Maybe I can clear up some misconceptions with my question: The files are not very large. They are simply over 2Mb. The users do not have "slow" connections, they are at least 5mbps. This "time out" happens very quickly, in the realm of 5 seconds, so I don't know if it's a timeout or not. The user often gets 1 or 2Mb in this chunk of time. I have tried streaming with a flash player. I have tried saving the target. Forcing the download. I have tried allowing the browser to stream the file. I have tried different browsers (FF, IE, Chrome). Users are able to download identical files when on different hosts.

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  • Eclipse Multitenancy. Now with a screencast.

    - by alexismp
    As a follow-up to the previous EclipseLink's mutitenancy blog post and the recent Eclipse Indigo release train and the recent GlassFish Podcast interview on EclipseLink, we now have a short screencast showing it all in action. You can also find it on the GlassFish YouTube Channel. The scenario is pretty simple with two simple and identical web applications deployed with different tenant identifiers via persistence.xml customization (just one of the means of identifying tenants with EclipseLink). Hopefully this'll help people understand what Java EE 7 multitenancy might look like.

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  • Database Mirroring Performance Monitoring

    Many people deploy performance monitoring solutions in a "one-size-fits-all" manner. That is, they tend to build a solution that can be easily deployed to multiple servers and capture basic information from each server. The trouble is that not every server is identical, not even within the same shop. For example, not every server may have database mirroring deployed, which means your performance monitoring solution may be missing some critical pieces of information with regards to monitoring database mirroring.

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  • How to Document and Configure SQL Server Instance Settings

    Occasionally, when you install identical databases on two different SQL Server instances, they will behave in surprisingly different ways. Why? Most likely, it is down to different configuration settings. There are around seventy of these settings and the DBA needs to be aware of the effect that many of them have. Brad McGehee explains them all in enough detail to help with most common configuration problems, and suggests some best practices.

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  • Directory structure and script arguments

    - by felwithe
    I'll often see a URL that looks something like this: site.com/articles/may/05/02/2011/article-name.php Surely all of those subdirectories don't actually exist? It seems like it would be a huge redundancy, even if it was only an identical index file in every directory. To change anything you'd have to change every single one. I guess my question is, is there some more elegant way that sites usually accomplish this?

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  • How can I fix my corrupted RAID1 ext4 partition on a Synology DS212 NAS?

    - by Neil
    I have two identical 3 TB disks that were in a RAID1 array, where one disk crashed. I replaced the failed disk, but not after the RAID partitions got messed up. I need to figure out how to restore the RAID array and get at my ext4 partition. Here are the properties of the surviving disk: # fdisk -l /dev/sda fdisk: device has more than 2^32 sectors, can't use all of them Disk /dev/sda: 2199.0 GB, 2199023255040 bytes 255 heads, 63 sectors/track, 267349 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sda1 1 267350 2147483647+ ee EFI GPT # parted /dev/sda print Model: ATA ST3000DM001-9YN1 (scsi) Disk /dev/sda: 3001GB Sector size (logical/physical): 512B/512B Partition Table: gpt Disk Flags: Number Start End Size File system Name Flags 1 131kB 2550MB 2550MB ext4 raid 2 2550MB 4698MB 2147MB linux-swap(v1) raid 5 4840MB 3001GB 2996GB raid I replaced the failed drive, and cloned the surviving drive to it so I have something to work with. I cloned the drives with dd if=/dev/sdb of=/dev/sda conv=noerror bs=64M, and now /dev/sda and /dev/sdb are identical. Here is the RAID information: # cat /proc/mdstat Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] md1 : active raid1 sdb2[1] 2097088 blocks [2/1] [_U] md0 : active raid1 sdb1[1] 2490176 blocks [2/1] [_U] unused devices: <none> It seems that md2 is missing. Here is what testdisk 6.14-WIP finds: Disk /dev/sda - 3000 GB / 2794 GiB - CHS 364801 255 63 Current partition structure: Partition Start End Size in sectors 1 P Linux Raid 256 4980735 4980480 [md0] 2 P Linux Raid 4980736 9175039 4194304 [md1] Invalid RAID superblock 5 P Linux Raid 9453280 5860519007 5851065728 5 P Linux Raid 9453280 5860519007 5851065728 # After a quick search Disk /dev/sda - 3000 GB / 2794 GiB - CHS 364801 255 63 Partition Start End Size in sectors D MS Data 256 4980607 4980352 [1.41.12-2197] D Linux Raid 256 4980735 4980480 [md0] D Linux Swap 4980736 9174895 4194160 D Linux Raid 4980736 9175039 4194304 [md1] >P MS Data 9481056 5858437983 5848956928 [1.41.12-2228] And listing the files on the last partition in the list shows all of my files intact. What should I do?

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  • Adding tables to a herd in bucardo

    - by Joseph the Dreamer
    Forgive my ignorance, I am a JS programmer given the task to do DB replication using bucardo. I understand the concept of how bucardo works, but setting it up is a bit confusing. The set-up is: Lubuntu Linux Two databases test_master and test_slave, using PostgreSQL Each DB has a table named test, containing 2 columns: id (PK) and test (int) I use pgAdmin3 I have already added them to bucardo's list of databases and added all tables. Table: public.test DB: test_slave PK: id (int4) Table: public.test DB: test_master PK: id (int4) As you see, due to the fact that the DBs are identical, even the schema names are identical. So when I do: bucardo_ctl add herd sample_herd public.test Ok, so it got added to the herd. But this command gets confused which database public.test comes from. So when I add a sync: $ bucardo_ctl add sync sample_sync source=sample_herd targetdb=test_slave type=fullcopy Failed to add sync: DBD::Pg::st execute failed: ERROR: Source and target databases cannot be the same: test_slave at line 118. at line 30. CONTEXT: PL/Perl function "validate_sync" at /usr/bin/bucardo_ctl line 3362. What does it mean that source and target cannot be the same? If it got confused as to which public.test to use as source, how do I differentiate?

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  • Windows 7 disk backup and clone for deployment to multiple systems

    - by gregmac
    I'm in the process of deploying some new PCs (there's only 8), all identical hardware. What I'd like to do is install Windows 7 (64bit), join to domain etc, install a bunch of other software, and then clone that drive to multiple other machines. I'd also like to be able to use it as a backup image, so the machine can be restored back to that image at some future date. I understand this involves at least sysprep, but I am confused after reading some tutorials that talk about using Windows Automated Installation Kit, or hacks with the registry and custom-build batch files. This process seems overly complex to me: I did something similar 10+ years ago, and and don't remember it being this bad. Surely things have improved in a decade? There's also some products that involve having network servers running deployment software, network boot, etc etc.. this is way more than I want to set up. My systems are all identical hardware. Is there a simplified way to clone PCs? Preferably (since I'm a lazy developer, and not an IT admin) I'd like to find some off-the-shelf product that I can run after I get the machine setup, that will spit out a bootable DVD I can run on all the other systems, which will boot up, ask for a computer name, join it to the domain, and that's it. Does such as product exist?

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  • cPanel web server redundancy advice?

    - by crgnz
    At present I operate a (reasonably low volume) web-hosting service with a Centos 5.3 server running cPanel/WHM. I would like to implement a level of redundancy such that in the event of server failure, I can restore service with a minimum of effort in less than 60 minutes. I also want to setup a secondary DNS that cPanel will replicate with. My current idea is to kill two birds with one stone by: My current server is called "www1" Purchase an identical server (HP DL360 G4) with mirrored disks. Call this server "www2" Install Centos 5.4 (or perhaps I should install 5.3 to be identical with www1) Install cPanel/WHM on this server and fully license it Setup www1 and www2 cPanel to replicate DNS with each other Setup a nightly replication script that does the following: a) rsync's the /home directory from www1 to www2 b) dumps all MySQL databases on www1 and copies them to a temp folder (with root access only) on www2 c) triggers a script to run on www2 that restores the MySQL dumps Thus each night a fully working copy of all the websites and MySQL databases is copied to www2. I do not have enough knowledge of MySQL replication to understand if it works safely and transparently with cPanel. Thus I propose the mysql dump/copy/restore due to not knowing any better! In the event that www1 dies a horrible death, I envisage that I could login to www2, change the IP addresses to those that www1 had, and presto, the websites are available again. The advantage of this idea is that it is fairly simple and "low tech" and thus does not require an expert sysadmin to setup and monitor (I am NOT an expert sysadmin) The disadvantage of this idea is that up to a full days worth of data changes would be lost. I think this would be acceptable to the sorts of customers I host at the moment. The other disadvantage would be having to pay for a full cPanel license, but I am comfortable with that cost, so for now all I want to discuss are technical considerations. Is this a sound scheme?

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