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  • enable Dojo support for Forms just on demand in Zend Framework

    - by Mike
    How to have Dojo support disabled by default and just enable it if you want to use it ? I have the problem that dojo support is automaticly loaded when using any form. Even without any dojo elements. I have following configuration: Bootstrap file if($this->dojo()->isEnabled()){ $this-dojo()-setLocalPath($this-baseUrl().'/js/dojo/dojo/dojo.js') -addStyleSheetModule('dijit.themes.tundra') -setDjConfigOption('usePlainJson',true); echo $this-dojo();} I thought to enable dojo I had to use explicit use something like this in my template/view file: $this->dojo()->enable(); How the tell Zend Framework not to use Dojo by default for Forms ?

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  • CakePHP Bake association problem

    - by Apu
    I have only two tables in my database with a one-to-many relationship between them (user hasMany messages) and am trying to get basic CRUD functionality going. Bake detects the associations correctly and specifies them correctly inside the model classes, but in controllers and views it looks like Cake doesn't know anything about those associations -- I don't even get a select tag for user_id when I go add a new message. Has anyone come across this problem before? What can I be doing wrong? Table structure appears to be fine: CREATE TABLE users ( id int(11) NOT NULL AUTO_INCREMENT, username varchar(255) NOT NULL, `password` varchar(255) NOT NULL, email varchar(255) NOT NULL, created datetime NOT NULL, modified datetime NOT NULL, PRIMARY KEY (id) ) ENGINE=MyISAM DEFAULT CHARSET=utf8; CREATE TABLE IF NOT EXISTS `messages` ( `id` int(11) NOT NULL AUTO_INCREMENT, `user_id` int(11) NOT NULL, `content` varchar(255) NOT NULL, `created` datetime NOT NULL, `modified` datetime NOT NULL, PRIMARY KEY (`id`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=1 ;

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  • Is there anything else I can do to optimize this MySQL query?

    - by Legend
    I have two tables, Table A with 700,000 entries and Table B with 600,000 entries. The structure is as follows: Table A: +-----------+---------------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +-----------+---------------------+------+-----+---------+----------------+ | id | bigint(20) unsigned | NO | PRI | NULL | auto_increment | | number | bigint(20) unsigned | YES | | NULL | | +-----------+---------------------+------+-----+---------+----------------+ Table B: +-------------+---------------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +-------------+---------------------+------+-----+---------+----------------+ | id | bigint(20) unsigned | NO | PRI | NULL | auto_increment | | number_s | bigint(20) unsigned | YES | MUL | NULL | | | number_e | bigint(20) unsigned | YES | MUL | NULL | | | source | varchar(50) | YES | | NULL | | +-------------+---------------------+------+-----+---------+----------------+ I am trying to find if any of the values in Table A are present in Table B using the following code: $sql = "SELECT number from TableA"; $result = mysql_query($sql) or die(mysql_error()); while($row = mysql_fetch_assoc($result)) { $number = $row['number']; $sql = "SELECT source, count(source) FROM TableB WHERE number_s < $number AND number_e > $number GROUP BY source"; $re = mysql_query($sql) or die(mysql_error); while($ro = mysql_fetch_array($re)) { echo $number."\t".$ro[0]."\t".$ro[1]."\n"; } } I was hoping that the query would go fast but then for some reason, it isn't terrible fast. My explain on the select (with a particular value of "number") gives me the following: mysql> explain SELECT source, count(source) FROM TableB WHERE number_s < 1812194440 AND number_e > 1812194440 GROUP BY source; +----+-------------+------------+------+-------------------------+------+---------+------+--------+----------------------------------------------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +----+-------------+------------+------+-------------------------+------+---------+------+--------+----------------------------------------------+ | 1 | SIMPLE | TableB | ALL | number_s,number_e | NULL | NULL | NULL | 696325 | Using where; Using temporary; Using filesort | +----+-------------+------------+------+-------------------------+------+---------+------+--------+----------------------------------------------+ 1 row in set (0.00 sec) Is there any optimization that I can squeeze out of this? I tried writing a stored procedure for the same task but it doesn't even seem to work in the first place... It doesn't give any syntax errors... I tried running it for a day and it was still running which felt odd. CREATE PROCEDURE Filter() Begin DECLARE number BIGINT UNSIGNED; DECLARE x INT; DECLARE done INT DEFAULT 0; DECLARE cur1 CURSOR FOR SELECT number FROM TableA; DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1; CREATE TEMPORARY TABLE IF NOT EXISTS Flags(number bigint unsigned, count int(11)); OPEN cur1; hist_loop: LOOP FETCH cur1 INTO number; SELECT count(*) from TableB WHERE number_s < number AND number_e > number INTO x; IF done = 1 THEN LEAVE hist_loop; END IF; IF x IS NOT NULL AND x>0 THEN INSERT INTO Flags(number, count) VALUES(number, x); END IF; END LOOP hist_loop; CLOSE cur1; END

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  • Android - Audio recorder FileNotFound

    - by david
    Hi, I'm trying to record audio this.recorder = new android.media.MediaRecorder(); this.recorder.setAudioSource(android.media.MediaRecorder.AudioSource.MIC); this.recorder.setOutputFormat(android.media.MediaRecorder.OutputFormat.DEFAULT); this.recorder.setAudioEncoder(android.media.MediaRecorder.AudioEncoder.DEFAULT); this.recorder.setOutputFile("pruebaAudioRecorder.mp4"); this.recorder.prepare(); this.recorder.start(); but when i call prepare method throws the FileNotFound exception. Should I create the file before prepare method? something like new File(...) If so, which should be the file path? thx a lot.

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  • Automate paster create -t plone3_buildout

    - by roopesh
    I want to automate the process of plone3_buildout. Explanation: The default(the one I use) way of building a plone site is using paster, like so: paster create -t plone3_buildout This asks me a few questions and then create a default buildout for the site. What I want: I want to automate this process using buildout. My buildout will execute this paster command, feed in my preconfigured values to the paster. I haven't found a recipe which can do this. If someone has an idea of how to do this, please share the info. If there is a recipe which can feed values to interactive commands(with known output, like with plone3_buildout command), that would be useful too.

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  • WCF Runtime Error while using Constructor

    - by Pranesh Nair
    Hi all, I am new to WCF i am using constructor in my WCF service.svc.cs file....It throws this error when i use the constructor The service type provided could not be loaded as a service because it does not have a default (parameter-less) constructor. To fix the problem, add a default constructor to the type, or pass an instance of the type to the host. When i remove the constructor its working fine....But its compulsory that i have to use constructor... This is my code namespace UserAuthentication { [ServiceBehavior(InstanceContextMode=System.ServiceModel.InstanceContextMode.Single)] public class UserAuthentication : UserRepository,IUserAuthentication { private ISqlMapper _mapper; private IRoleRepository _roleRepository; public UserAuthentication(ISqlMapper mapper): base(mapper) { _mapper = mapper; _roleRepository = new RoleRepository(_mapper); } public string EduvisionLogin(EduvisionUser aUser, int SchoolID) { UserRepository sampleCode= new UserRepository(_mapper); sampleCode.Login(aUser); return "Login Success"; } } } can anyone provide ideas or suggestions or sample code hw to resolve this issue...

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  • Ambiguous Generic restriction T:class vs T:struct

    - by Maslow
    This code generates a compiler error that the member is already defined with the same parameter types. private T GetProperty<T>(Func<Settings, T> GetFunc) where T:class { try { return GetFunc(Properties.Settings.Default); } catch (Exception exception) { SettingReadException(this,exception); return null; } } private TNullable? GetProperty<TNullable>(Func<Settings, TNullable> GetFunc) where TNullable : struct { try { return GetFunc(Properties.Settings.Default); } catch (Exception ex) { SettingReadException(this, ex); return new Nullable<TNullable>(); } } Is there a clean work around?

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  • Hibernate constraint ConstraintViolationException. Is there an easy way to ignore duplicate entries?

    - by vincent
    Basically I've got the below schema and I'm inserting records if they don't exists. However when it comes to inserting a duplicate it throws and error as I would expect. My question is whether there is an easy way to make Hibernate to just ignore inserts which would in effect insert duplicates? CREATE TABLE IF NOT EXISTS `method` ( `id` bigint(20) NOT NULL AUTO_INCREMENT, `name` varchar(10) DEFAULT NULL, PRIMARY KEY (`id`), UNIQUE KEY `name` (`name`) ) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=2 ; SEVERE: Duplicate entry 'GET' for key 'name' Exception in thread "pool-11-thread-4" org.hibernate.exception.ConstraintViolationException: could not insert:

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  • xsl key - multiple levels for an element

    - by user1004770
    My previous post was not very meaningful. reposting here. What i am looking for is the QueueManager element, under SORRegion name="default"(which is the parent), within inan.xml. I have used xsl key. In my xsl the value 'default' is hardcoded. here is the xsl i used <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" > <xsl:output omit-xml-declaration="yes" indent="yes" method="xml" /> <xsl:key name="CR-lookup" match="Service" use="concat(@ServiceName, '+', SOR/@SORname, '+', */CountryCode/@Ctrycd, '+', */*/SORRegion/@name, '+', */*/*/ConsumerName/@name)"/> <xsl:variable name="CRTable" select="document('inan.xml')"/> <xsl:template match="/"> <Contributor> <ContributorRole> <xsl:for-each select="$CRTable"> <!-- change context document --> <xsl:for-each select="key('CR-lookup', concat('StatementIndicatorsService', '+', 'Globestar', '+', '124', '+', 'default', '+', 'MYCA'))"> <a> <xsl:value-of select="*/*/*/*/QueueManager"/> </a> </xsl:for-each> </xsl:for-each> </ContributorRole> </Contributor> </xsl:template> </xsl:stylesheet> any input xml file is fine. here is my actual output <Contributor> <ContributorRole /> </Contributor> expected output <Contributor> <ContributorRole> <a>MAO1</a> </ContributorRole> </Contributor> inan.xml document <RoutingDetails> <Service ServiceName="StatementIndicatorsService"> <SOR SORname="Globestar"> <CountryCode Ctrycd="124"> <SORRegion name="Test"> <ConsumerName name="MYCA"> <AutomationIds> <PreAutoId> <AutomationId>XA1146A</AutomationId> <AutomationId>XA1146B</AutomationId> </PreAutoId> <DefaultAutoId> <AutomationId>XA1146C</AutomationId> </DefaultAutoId> </AutomationIds> </ConsumerName> <QueueDetails> <QueueManager>MAO1</QueueManager> <ReplyQueueManager>MAO1</ReplyQueueManager> <RequestQueue>GSTAR.ICS.DP.DHIPO211.REQUEST</RequestQueue> <ReplyQueue>ICS.DP.REPLY</ReplyQueue> </QueueDetails> </SORRegion> <SORRegion name="default"> <ConsumerName name="MYCA"> <AutomationIds> <PreAutoId> <AutomationId>XA1146A</AutomationId> <AutomationId>XA1146A</AutomationId> </PreAutoId> <DefaultAutoId> <AutomationId>XA1146A</AutomationId> </DefaultAutoId> </AutomationIds> </ConsumerName> <QueueDetails> <QueueManager>MAO1</QueueManager> <ReplyQueueManager>MAO1</ReplyQueueManager> <RequestQueue>GSTAR.ICS.DP.DHIPO211.REQUEST</RequestQueue> <ReplyQueue>ICS.DP.REPLY</ReplyQueue> </QueueDetails> </SORRegion> <SORRegion name="CICDKBX1"> <ConsumerName name="MYCA"> <AutomationIds> <PreAutoId> <AutomationId>XA1146A</AutomationId> <AutomationId>XA1146A</AutomationId> </PreAutoId> <DefaultAutoId> <AutomationId>XA1146A</AutomationId> </DefaultAutoId> </AutomationIds> </ConsumerName> <QueueDetails> <QueueManager>MAO1</QueueManager> <ReplyQueueManager>MAO1</ReplyQueueManager> <RequestQueue>GSTAR.ICS.DP.DHIPO211.REQUEST</RequestQueue> <ReplyQueue>ICS.DP.REPLY</ReplyQueue> </QueueDetails> </SORRegion> <SORRegion name="CICDKAX4"> <ConsumerName name="MYCA"> <AutomationIds> <PreAutoId> <AutomationId>XA1146A</AutomationId> <AutomationId>XA1146A</AutomationId> </PreAutoId> <DefaultAutoId> <AutomationId>XA1146A</AutomationId> </DefaultAutoId> </AutomationIds> </ConsumerName> <QueueDetails> <QueueManager>MAO1</QueueManager> <ReplyQueueManager>MAO1</ReplyQueueManager> <RequestQueue>GSTAR.GDAS.DHIPO204.REQUEST</RequestQueue> <ReplyQueue>ICS.DP.REPLY</ReplyQueue> </QueueDetails> </SORRegion> <SORRegion name="CICDKEX7"> <ConsumerName name="MYCA"> <AutomationIds> <PreAutoId> <AutomationId>XA1146A</AutomationId> <AutomationId>XA1146A</AutomationId> </PreAutoId> <DefaultAutoId> <AutomationId>XA1146A</AutomationId> </DefaultAutoId> </AutomationIds> </ConsumerName> <QueueDetails> <QueueManager>MAO1</QueueManager> <ReplyQueueManager>MAO1</ReplyQueueManager> <RequestQueue>GSTAR.ICS.DP.DHIPO247.REQUEST</RequestQueue> <ReplyQueue>ICS.DP.REPLY</ReplyQueue> </QueueDetails> </SORRegion> </CountryCode> <CountryCode Ctrycd="826"> <SORRegion name="Test"> <ConsumerName name="MYCA"> <AutomationIds> <PreAutoId> <AutomationId>XA1146A</AutomationId> <AutomationId>XA1146A</AutomationId> </PreAutoId> <DefaultAutoId> <AutomationId>XA1146A</AutomationId> </DefaultAutoId> </AutomationIds> </ConsumerName> <QueueDetails> <QueueManager>MAO1</QueueManager> <ReplyQueueManager>MAO1</ReplyQueueManager> <RequestQueue>GSTAR.ICS.DP.DHIPO211.REQUEST</RequestQueue> <ReplyQueue>ICS.DP.REPLY</ReplyQueue> </QueueDetails> </SORRegion> <SORRegion name="default"> <ConsumerName name="MYCA"> <AutomationIds> <PreAutoId> <AutomationId>XA1146A</AutomationId> <AutomationId>XA1146A</AutomationId> </PreAutoId> <DefaultAutoId> <AutomationId>XA1146A</AutomationId> </DefaultAutoId> </AutomationIds> </ConsumerName> <QueueDetails> <QueueManager>MAO1</QueueManager> <ReplyQueueManager>MAO1</ReplyQueueManager> <RequestQueue>GSTAR.ICS.DP.DHIPO211.REQUEST</RequestQueue> <ReplyQueue>ICS.DP.REPLY</ReplyQueue> </QueueDetails> </SORRegion> <SORRegion name="CICDKBX1"> <ConsumerName name="MYCA"> <AutomationIds> <PreAutoId> <AutomationId>XA1146A</AutomationId> <AutomationId>XA1146A</AutomationId> </PreAutoId> <DefaultAutoId> <AutomationId>XA1146A</AutomationId> </DefaultAutoId> </AutomationIds> </ConsumerName> <QueueDetails> <QueueManager>MAO1</QueueManager> <ReplyQueueManager>MAO1</ReplyQueueManager> <RequestQueue>GSTAR.ICS.DP.DHIPO211.REQUEST</RequestQueue> <ReplyQueue>ICS.DP.REPLY</ReplyQueue> </QueueDetails> </SORRegion> <SORRegion name="CICDKAX4"> <ConsumerName name="MYCA"> <AutomationIds> <PreAutoId> <AutomationId>XA1146A</AutomationId> <AutomationId>XA1146A</AutomationId> </PreAutoId> <DefaultAutoId> <AutomationId>XA1146A</AutomationId> </DefaultAutoId> </AutomationIds> </ConsumerName> <QueueDetails> <QueueManager>MAO1</QueueManager> <ReplyQueueManager>MAO1</ReplyQueueManager> <RequestQueue>GSTAR.GDAS.DHIPO204.REQUEST</RequestQueue> <ReplyQueue>ICS.DP.REPLY</ReplyQueue> </QueueDetails> </SORRegion> <SORRegion name="CICDKEX7"> <ConsumerName name="MYCA"> <AutomationIds> <PreAutoId> <AutomationId>XA1146A</AutomationId> <AutomationId>XA1146A</AutomationId> </PreAutoId> <DefaultAutoId> <AutomationId>XA1146A</AutomationId> </DefaultAutoId> </AutomationIds> </ConsumerName> <QueueDetails> <QueueManager>MAO1</QueueManager> <ReplyQueueManager>MAO1</ReplyQueueManager> <RequestQueue>GSTAR.GDAS.DHIPO247.REQUEST</RequestQueue> <ReplyQueue>ICS.DP.REPLY</ReplyQueue> </QueueDetails> </SORRegion> </CountryCode> <CountryCode Ctrycd="724"> <SORRegion name="Test"> <ConsumerName name="MYCA"> <AutomationIds> <PreAutoId> <AutomationId>XA4248A</AutomationId> <AutomationId>XA1146A</AutomationId> </PreAutoId> <DefaultAutoId> <AutomationId>XA4248A</AutomationId> </DefaultAutoId> </AutomationIds> </ConsumerName> <QueueDetails> <QueueManager>MAO1</QueueManager> <ReplyQueueManager>MAO1</ReplyQueueManager> <RequestQueue>GSTAR.GDAS.DHIPO239.REQUEST</RequestQueue> <ReplyQueue>ICS.DP.REPLY</ReplyQueue> </QueueDetails> </SORRegion> <SORRegion name="default"> <ConsumerName name="MYCA"> <AutomationIds> <PreAutoId> <AutomationId>XA4248A</AutomationId> <AutomationId>XA1146A</AutomationId> </PreAutoId> <DefaultAutoId> <AutomationId>XA4248A</AutomationId> </DefaultAutoId> </AutomationIds> </ConsumerName> <QueueDetails> <QueueManager>MAO1</QueueManager> <ReplyQueueManager>MAO1</ReplyQueueManager> <RequestQueue>GSTAR.GDAS.DHIPO239.REQUEST</RequestQueue> <ReplyQueue>ICS.DP.REPLY</ReplyQueue> </QueueDetails> </SORRegion> <SORRegion name="CICDKBX1"> <ConsumerName name="MYCA"> <AutomationIds> <PreAutoId> <AutomationId>XA4248A</AutomationId> <AutomationId>XA1146A</AutomationId> </PreAutoId> <DefaultAutoId> <AutomationId>XA4248A</AutomationId> </DefaultAutoId> </AutomationIds> </ConsumerName> <QueueDetails> <QueueManager>MAO1</QueueManager> <ReplyQueueManager>MAO1</ReplyQueueManager> <RequestQueue>GSTAR.ICS.DP.DHIPO211.REQUEST</RequestQueue> <ReplyQueue>ICS.DP.REPLY</ReplyQueue> </QueueDetails> </SORRegion> <SORRegion name="CICDKAX4"> <ConsumerName name="MYCA"> <AutomationIds> <PreAutoId> <AutomationId>XA4248A</AutomationId> <AutomationId>XA1146A</AutomationId> </PreAutoId> <DefaultAutoId> <AutomationId>XA4248A</AutomationId> </DefaultAutoId> </AutomationIds> </ConsumerName> <QueueDetails> <QueueManager>MAO1</QueueManager> <ReplyQueueManager>MAO1</ReplyQueueManager> <RequestQueue>GSTAR.GDAS.DHIPO204.REQUEST</RequestQueue> <ReplyQueue>ICS.DP.REPLY</ReplyQueue> </QueueDetails> </SORRegion> <SORRegion name="CICDKEX7"> <ConsumerName name="MYCA"> <AutomationIds> <PreAutoId> <AutomationId>XA4248A</AutomationId> <AutomationId>XA1146A</AutomationId> </PreAutoId> <DefaultAutoId> <AutomationId>XA4248A</AutomationId> </DefaultAutoId> </AutomationIds> </ConsumerName> <QueueDetails> <QueueManager>MAO1</QueueManager> <ReplyQueueManager>MAO1</ReplyQueueManager> <RequestQueue>GSTAR.GDAS.DHIPO247.REQUEST</RequestQueue> <ReplyQueue>ICS.DP.REPLY</ReplyQueue> </QueueDetails> </SORRegion> </CountryCode> </SOR> </Service> </RoutingDetails>

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  • MPMediaickerController memory leak

    - by Joe
    This is code from Apple's Addmusic example. MPMediaPickerController *picker = [[MPMediaPickerController alloc] initWithMediaTypes: MPMediaTypeMusic]; picker.delegate = self; picker.allowsPickingMultipleItems = YES; picker.prompt = NSLocalizedString (@"Add songs to play", "Prompt in media item picker"); // The media item picker uses the default UI style, so it needs a default-style // status bar to match it visually [[UIApplication sharedApplication] setStatusBarStyle: UIStatusBarStyleDefault animated: YES]; [self presentModalViewController: picker animated: YES]; [picker release]; I'm using this code in my app and the Leaks instrument highlights a leak on the line: [self presentModalViewController: picker animated: YES]; I think that this is because this line retains a reference to picker which cannot be subsequently released. Is there any way around this?

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  • Using Application Settings and reading defaults from app.config

    - by Peter Goras
    Hi, I need to deploy a Windows Forms application using ClickOnce deployment. (VS2008, .NET 3.5) And I need to provide a configuration file for this app that any user can modify. For this reason, I am using Application Settings instead of standard appSetttings in app.config so I can separate the the user config from app config. see http://msdn.microsoft.com/en-us/library/ms228995(VS.80).aspx Creating a Settings.settings file using VS generated a class with hard-coded default values like this: [global::System.Configuration.DefaultSettingValueAttribute("blahblah")] public string MyProperty ... WTF? I want to read the default values from the app.config! So I created my own class deriving from ApplicationSettingsBase but I cannot get this to read values from the app.config. Any ideas?

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  • Master-slave vs. peer-to-peer archictecture: benefits and problems

    - by Ashok_Ora
    Normal 0 false false false EN-US X-NONE X-NONE Almost two decades ago, I was a member of a database development team that introduced adaptive locking. Locking, the most popular concurrency control technique in database systems, is pessimistic. Locking ensures that two or more conflicting operations on the same data item don’t “trample” on each other’s toes, resulting in data corruption. In a nutshell, here’s the issue we were trying to address. In everyday life, traffic lights serve the same purpose. They ensure that traffic flows smoothly and when everyone follows the rules, there are no accidents at intersections. As I mentioned earlier, the problem with typical locking protocols is that they are pessimistic. Regardless of whether there is another conflicting operation in the system or not, you have to hold a lock! Acquiring and releasing locks can be quite expensive, depending on how many objects the transaction touches. Every transaction has to pay this penalty. To use the earlier traffic light analogy, if you have ever waited at a red light in the middle of nowhere with no one on the road, wondering why you need to wait when there’s clearly no danger of a collision, you know what I mean. The adaptive locking scheme that we invented was able to minimize the number of locks that a transaction held, by detecting whether there were one or more transactions that needed conflicting eyou could get by without holding any lock at all. In many “well-behaved” workloads, there are few conflicts, so this optimization is a huge win. If, on the other hand, there are many concurrent, conflicting requests, the algorithm gracefully degrades to the “normal” behavior with minimal cost. We were able to reduce the number of lock requests per TPC-B transaction from 178 requests down to 2! Wow! This is a dramatic improvement in concurrency as well as transaction latency. The lesson from this exercise was that if you can identify the common scenario and optimize for that case so that only the uncommon scenarios are more expensive, you can make dramatic improvements in performance without sacrificing correctness. So how does this relate to the architecture and design of some of the modern NoSQL systems? NoSQL systems can be broadly classified as master-slave sharded, or peer-to-peer sharded systems. NoSQL systems with a peer-to-peer architecture have an interesting way of handling changes. Whenever an item is changed, the client (or an intermediary) propagates the changes synchronously or asynchronously to multiple copies (for availability) of the data. Since the change can be propagated asynchronously, during some interval in time, it will be the case that some copies have received the update, and others haven’t. What happens if someone tries to read the item during this interval? The client in a peer-to-peer system will fetch the same item from multiple copies and compare them to each other. If they’re all the same, then every copy that was queried has the same (and up-to-date) value of the data item, so all’s good. If not, then the system provides a mechanism to reconcile the discrepancy and to update stale copies. So what’s the problem with this? There are two major issues: First, IT’S HORRIBLY PESSIMISTIC because, in the common case, it is unlikely that the same data item will be updated and read from different locations at around the same time! For every read operation, you have to read from multiple copies. That’s a pretty expensive, especially if the data are stored in multiple geographically separate locations and network latencies are high. Second, if the copies are not all the same, the application has to reconcile the differences and propagate the correct value to the out-dated copies. This means that the application program has to handle discrepancies in the different versions of the data item and resolve the issue (which can further add to cost and operation latency). Resolving discrepancies is only one part of the problem. What if the same data item was updated independently on two different nodes (copies)? In that case, due to the asynchronous nature of change propagation, you might land up with different versions of the data item in different copies. In this case, the application program also has to resolve conflicts and then propagate the correct value to the copies that are out-dated or have incorrect versions. This can get really complicated. My hunch is that there are many peer-to-peer-based applications that don’t handle this correctly, and worse, don’t even know it. Imagine have 100s of millions of records in your database – how can you tell whether a particular data item is incorrect or out of date? And what price are you willing to pay for ensuring that the data can be trusted? Multiple network messages per read request? Discrepancy and conflict resolution logic in the application, and potentially, additional messages? All this overhead, when all you were trying to do was to read a data item. Wouldn’t it be simpler to avoid this problem in the first place? Master-slave architectures like the Oracle NoSQL Database handles this very elegantly. A change to a data item is always sent to the master copy. Consequently, the master copy always has the most current and authoritative version of the data item. The master is also responsible for propagating the change to the other copies (for availability and read scalability). Client drivers are aware of master copies and replicas, and client drivers are also aware of the “currency” of a replica. In other words, each NoSQL Database client knows how stale a replica is. This vastly simplifies the job of the application developer. If the application needs the most current version of the data item, the client driver will automatically route the request to the master copy. If the application is willing to tolerate some staleness of data (e.g. a version that is no more than 1 second out of date), the client can easily determine which replica (or set of replicas) can satisfy the request, and route the request to the most efficient copy. This results in a dramatic simplification in application logic and also minimizes network requests (the driver will only send the request to exactl the right replica, not many). So, back to my original point. A well designed and well architected system minimizes or eliminates unnecessary overhead and avoids pessimistic algorithms wherever possible in order to deliver a highly efficient and high performance system. If you’ve every programmed an Oracle NoSQL Database application, you’ll know the difference! /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin-top:0in; mso-para-margin-right:0in; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0in; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin;}

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  • Iphone video subtitles programmatic selection

    - by Marek
    I have some videos (mp4) with multiple language subtitles that can be read by an iphone. Users can select to view the subtitle and the language from the default iphone button in the video ui. I would like to be able to set a defalut programmatically, so that, for instance, an user can select a language just one time in the main screen and, from then on, all the videos will have that language subtitles on by default. I can't find anything in the official documentation. I tought about some workarounds like renaming srt files but i don't think it's possible witouht copying all the video files in the user documents dir (not an option).

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  • Window Size when SizeToContent is not specified

    - by moogs
    When the following XAML used, the window size is not 5000x5000, but some small window where the button is cropped. <Window x:Class="WpfApplication1.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Window1" > <Button Width="5000" Height="5000">XXX</Button> </Window> From what I can tell, size I did not specify the SizeToContent attribute, the default is "Manual", so it will use *size of a window is determined by other properties, including Width, Height, MaxWidth, MaxHeight, MinWidth, and MinHeight. * From the WPF Windows Overview, it seems those other properties are FrameworkElement::MinHeight/Width, and FrameworkElement::MaxHeight. But since the default for the Mins are 0, the Maxs are Infinity and the Width/Height is Nan....what's going on? Where is WPF getting the window size? Any pointers to the right direction would be appreciated.

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  • How to merge VB.NET WEB Project with C#.NET MVC project

    - by Thushara Perera
    Hi All, I've got an existing asp.net project written in vb.net need to merge into C# ASP.NET MVC 1.0 application. I couldn't find a good article on this. I have successfully created a sample project and merge it. It works successfully. But when merge it into my real project it does not work. I've used C#.csproj project file and deleted VB project file. for the merging i could find a good article this link successful on sample project not with the real project. good one: http://www.packtpub.com/article/mixing-asp.net-webforms-and-asp.net-mvc how it is possible to merge VB Default.aspx, C# Default.aspx and VB Global.asax, C# Global.asax. Can I used VB.vbproj file insted of csproj Thanks Thushara Perera

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  • Selected Item not being updated?

    - by iTayb
    I've got the following DropDownList control: <asp:DropDownList ID="SubjectFilter" runat="server" AutoPostBack="True" onselectedindexchanged="SubjectFilter_SelectedIndexChanged"></asp:DropDownList> SubjectFilter data: BookStore b = new BookStore(); b.LoadFromXML(Server.MapPath("list.xml")); SubjectFilter.DataSource = b.BooksList.Select(x => x.Subject).Distinct().ToArray(); SubjectFilter.DataBind(); SubjectFilter.Items.Insert(0, new ListItem("???", "Default")); Everything loads just fine. However in the SubjectFilter_SelectedIndexChanged method, SubjectFilter.SelectedValue is always Default, even though I'm selecting different options. What is the problem? Thank you very much.

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  • Manipulate Page Theme Programatically

    - by Aren B
    I've got the following Setup in my Theme: \App_Themes\Default\StyleSheet.css \App_Themes\Default\PrintStyleSheet.css The PrintStyleSheet.css file has a set of printing css rules set in them wrapped in an @Media Print { } block. I need a way to programmatically remove the PrintStyleSheet.css from the list of css files for ASP.NET to inject based on some flags. (Some instances we want to print the site verbatim without custom formatting). I know i could build a seperate theme without the PrintStyleSheet.css in it and switch the theme programmatically, however this would introduce duplication of my master stylesheet which is not acceptable. Any ideas?

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  • MySQL Column Value Pivot

    - by manyxcxi
    I have a MySQL InnoDB table laid out like so: id (int), run_id (int), element_name (varchar), value (text), line_order, column_order `MyDB`.`MyTable` ( `id` bigint(20) NOT NULL, `run_id` int(11) NOT NULL, `element_name` varchar(255) NOT NULL, `value` text, `line_order` int(11) default NULL, `column_order` int(11) default NULL It is used to store data generated by a Java program that used to output this in CSV format, hence the line_order and column_order. Lets say I have 2 entries (according to the table description): 1,1,'ELEMENT 1','A',0,0 2,1,'ELEMENT 2','B',0,1 I want to pivot this data in a view for reporting so that it would look like more like the CSV would, where the output would look this: --------------------- |ELEMENT 1|ELEMENT 2| --------------------- | A | B | --------------------- The data coming in is extremely dynamic; it can be in any order, can be any of over 900 different elements, and the value could be anything. The Run ID ties them all together, and the line and column order basically let me know where the user wants that data to come back in order.

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  • ICalendar parser in PHP that supports timezones

    - by Vincent Robert
    I am looking for a PHP class that can parse an ICalendar (ICS) file and correctly handle timezones. I already created an ICS parser myself but it can only handle timezones known to PHP (like 'Europe/Paris'). Unfortunately, ICS file generated by Evolution (default calendar software of Ubuntu) does not use default timezone IDs. It exports events with its a specific timezone ID exporting also the full definition of the timezone: daylight saving dates, recurrence rule and all the hard stuff to understand about timezones. This is too much for me. Since it was only a small utility for my girlfriend, I won't have time to investigate further the ICalendar specification and create a full blown ICalendar parser myself. So is there any known implementation in PHP of ICalendar file format that can parse timezones definitions?

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  • Is ASP.Net Server Control, Postback Architecture failed in current Web 2.0 World.

    - by Lalit
    What i am looking around me is the drastically change in ASP.Net Architecture. More and more company are following the approach of JSON based wcf service in middle tier. Plain HTML based UI tier with JQuery/Ajax. No Postback at all, This contradicts the Default behaviour of Asp.Net Server Control/Code Behind Event handler/Postback. I am a Asp.Net Web Developer for around 4 years, and concerned about the future of ASP.Net. Is the Default Architecture of ASP.Net is Outdated at all? Does MVC or ASP.Net 4.0 Tries to solve the Issue?

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  • RNDC fails: permission denied

    - by pawz
    Named works great. It creates a pid in /var/run/named/named.pid as expected. It is listening on port 953 as shown by the log: Apr 20 14:42:38 guchuko named[9115]: command channel listening on 127.0.0.1#953 But whenever I try to run "rndc reload" I get: rndc: 'reload' failed: permission denied What file is it being denied permission to ? It doesn't log anything so I don't know why it's not working. I've compiled bind 9.4-ESV-R1 from source and I've patched it with the mysql mod. my named.conf: options { directory "/var/bind"; forwarders { 203.82.213.101; 203.188.144.1; }; listen-on-v6 { none; }; listen-on { 127.0.0.1; 192.168.0.6; }; pid-file "/var/run/named/named.pid"; }; logging { channel simple_log { file "/var/log/named.log" versions 3 size 5m; severity debug 5; print-time yes; print-severity yes; print-category yes; }; category default { simple_log; }; }; zone "." IN { type hint; file "named.ca"; }; zone "localhost" IN { type master; file "pri/localhost.zone"; allow-update { none; }; notify no; }; include "/etc/rndc.key" my rndc.conf options { default-server 127.0.0.1; default-key "rndc-key"; }; server 127.0.0.1 { key "rndc-key"; }; include "/etc/rndc.key"; my rndc.key: key "rndc-key" { algorithm hmac-md5; secret "XFc8C+yCLK0mIheTSBj41g=="; };

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