case class - Page 77 - Developer IT

Dynamically add annotation to an existing class

- by ng

I have the following class public class Person { ... } I would like to create another class that would look like this. @SomeAnnotation public class Person { ... } Via a simple method like so. public static Class addAnnotation(Class originalType, Class<? extends Annotation> annotation) { // what goes here? } Is there an easy way to do this via ASM for example? What dependencies would I need. I have tried to Google this however the examples I have found are either incomplete or are doing something else. Other frameworks such as javassist would be just as good.

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Make password case unsensitive in shared ASP.Net membership tables web ap

- by bill

Hi all, i have two webapps.. that share ASP.Net membership tables. Everything works fine except i cannot remove case-sensitivity in one of the apps the way i am doing it in the other. in the non-working app void Login1_LoggingIn(object sender, LoginCancelEventArgs e) { string username = Login1.UserName.Trim(); if (!string.IsNullOrEmpty(username)) { MembershipUser user = Membership.GetUser(username); if (user != null) { // Only adjust the UserName if the password is correct. This is more secure // so a hacker can't find valid usernames if we adjust the case of mis-cased // usernames with incorrect passwords. string password = Login1.Password.ToUpper(); if (Membership.ValidateUser(user.UserName, password)) { Login1.UserName = user.UserName; } } } } is not working. the password is stored as all upper case. Converted at the time the membership user is created! So if the password is PASSWORD, typing PASSWORD allows me to authenticate. but typing password does not! Even though i can see the string being sent is PASSWORD (converted with toUpper()). I am at a complete loss on this.. in the other app i can type in lower or upper or mixed and i am able to authenticate. In the other app i am not using the textboxes from the login control though.. not sure if this is making the difference??

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How to extend WCF returned class properly?

- by vikasde

I am using a WCF service in my project. This service returns a class called "Store". I created a new local class which inherits from "Store". My class is called "ExtendedStore". My ExtendedStore looks like this: class ExtendedStore : StoreManagerService.Store { public int Id; .... } Now I am using the WCF service to cast to my class using the following code: StoreManagerService.StoreClient client = new StoreManagerService.StoreClient(); ExtendedStore store = (ExtendedStore) client.GetStore(); // bombs here I am not able to cast the returned Store class from the service to my ExtendedStore class. I get the below error message: Unable to cast object of type 'ConsoleApplication1.StoreManagerService.Store' to type 'ConsoleApplication1.ExtendedStore'. Shouldn't I be able to cast it? If not, is there a workaround?

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Table per subclass inheritance relationship: How to query against the Parent class without loading a

- by Arthur Ronald F D Garcia

Suppose a Table per subclass inheritance relationship which can be described bellow (From wikibooks.org - see here) Notice Parent class is not abstract @Entity @Inheritance(strategy=InheritanceType.JOINED) public class Project { @Id private long id; // Other properties } @Entity @Table(name="LARGEPROJECT") public class LargeProject extends Project { private BigDecimal budget; } @Entity @Table(name="SMALLPROJECT") public class SmallProject extends Project { } I have a scenario where i just need to retrieve the Parent class. Because of performance issues, What should i do to run a HQL query in order to retrieve the Parent class and just the Parent class without loading any subclass ???

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store in a variable only the first or only the second class of an element

- by shecky

I'm using this bit of jQ to add a class to two different elements based on the class of another (parent/grandparent, etc) element: $(document).ready(function(){ var containerClass = $('#main-content').attr('class'); $('#nav-primary li#'+containerClass).addClass('active'); $('#aux-left div[id$='+containerClass+']').addClass('active'); }); Brilliant, but I have two problems with it: First, when there's no class at all in <div id="main-content">, the 'active' class is added to all the #nav-primary LIs, and also to all the #aux-left DIVs; how can I modify this so that in the absence of any class on #main-content, do nothing? Second, how can I target only the first or second of multiple classes to store in the 'containerClass' variable, e.g., <div id="main-content" class="apples bananas">? Very much appreciated! svs

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Link a programmatic instantiation of class x in class y to a view controller of class x

- by Joel Derfner

I have classes Compose and Haiku, each connected to a view controller in IB. Haiku is instantiated in Compose as ghhaiku. Haiku has an array, self.arrayOfHaiku, with 117 members. But in Compose, self.ghhaiku.arrayOfHaiku has no members. I think the problem is that I haven't linked the instance of Haiku that has the 117-member array with the instance of Haiku created in Compose. But how do I do that? (I could of course be totally wrong and the problem could be something else, but that seems to make intuitive sense.) Any thoughts?

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update value of a variable outside a class in VB.NET

- by dpp

I have a class derived from a Form, it has textbox for username and password and an OK button. I want it to behave like an InputBox so I can use it like this: Dim Username As String = "" Dim Password As String = "" Dim authorization As New Authorization(Username, Password) authorization.ShowDialog() 'The user will click OK and I will expect the Username and Password to change based on the user input MsgBox(Username & " " & Password) The Authorization class: Public Class Authorization Dim RefUsername As String Dim RefPassword As String Public Sub New(ByRef Username As String, ByRef Password As String) InitializeComponent() RefUsername = Username 'I'm trying to pass reference instead of value RefPassword = Password 'I'm trying to pass reference instead of value End Sub Private Sub OKButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles AuthorizeButton.Click RefUsername = Username.Text 'I'm trying to change value of variable outside the class RefPassword = Password.Text 'I'm trying to change value of variable outside the class Me.Close() End Sub End Class In short, I want to change the value of variables outside the class when the user clicks the OK, how am I going to accomplish that?

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C++: Case statement within while loop?

- by Jason

I just started C++ but have some prior knowledge to other languages (vb awhile back unfortunately), but have an odd predicament. I disliked using so many IF statements and wanted to use switch/cases as it seemed cleaner, and I wanted to get in the practice.. But.. Lets say I have the following scenario (theorietical code): while(1) { //Loop can be conditional or 1, I use it alot, for example in my game char something; std::cout << "Enter something\n -->"; std::cin >> something; //Switch to read "something" switch(something) { case 'a': cout << "You entered A, which is correct"; break; case 'b': cout << "..."; break; } } And that's my problem. Lets say I wanted to exit the WHILE loop, It'd require two break statements? This obviously looks wrong: case 'a': cout << "You entered A, which is correct"; break; break; So can I only do an IF statement on the 'a' to use break;? Am I missing something really simple? This would solve a lot of my problems that I have right now.

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JQuery if/else statement matching a wildcard css name

- by Neokoenig

Hi All, I'm trying to write an if/else statement in jQuery which can change an elements class by matching 'IN' or 'OUT' (in this case). I.e, I have several Divs with class='IN-something' OR class='OUT-something'. The below would work if I new the exact CSS class, but all I'll know is whether it contains 'IN' or 'OUT'. So like this, but works: if ($(jRow).hasClass('IN-*')) {jRow.attr( "class", "OUT-foo" );} else {jRow.attr( "class", "IN-foo");} Ideas? Thanks!

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VB.Net Create Database table from class property

- by joeb

I'm trying to create an inheritable class(OF t) in vb.net that I will pass it a class of objects. Inside the class of objects I want to use the class properties to create a corresponding database table. Like below Public Class SampleClass #Region "Properties" Private newPropertyValue As String Public Property NewProperty() As String Get Return newPropertyValue End Get Set(ByVal value As String) newPropertyValue = value End Set End Property #End Region Public Sub New() End Sub End Class I'm new to vb.net so I don't know my way around exactly. I was looking into class attributes for this action but they do not fully make sense to me yet. Thanks in advance.

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How is does this module code work?

- by phsr

I'm new to ruby and I am trying to figure out how the following code works The following code is inside a class in a module. The method is called later with the following code: @something ||= Module::Class.config class << self def config &block options = OpenStruct.new yield options if block_given? init_client! Client.new(options) end def init_client!(client) base_eigenclass = class << Base; self; end base_eigenclass.send :define_method, :client do @client = client end client end end The class has some constants in it, and when the classes initialize is called, the instance member are set to option.variable || VARIABLE_CONSTANT. I understand that if there is no value for option.variable then VARIABLE_CONSTANT is used, but I don't understand that calling Module::Class.config do |options| #some block end set the @client until config is called again with options The code definitely works, but I want to understand how it does

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Java: Can't implement runnable on a test case: void run() collides

- by Zombies

So I have a test case that I want to make into a thread. I cannot extend Thread nor can I implement runnable since TestCase already has a method void run(). The compilation error I am getting is Error(62,17): method run() in class com.util.SeleneseTestCase cannot override method run() in class junit.framework.TestCase with different return type, was class junit.framework.TestResult. What I am trying to do is to scale a Selenium testcase up to perform stress testing. I am not able to use selenium grid/pushtotest.com/amazon cloud at this time (installation issues/install time/resource issues). So this really is more of a Java language issue for me.

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How does this module code work?

- by phsr

I'm new to ruby and I am trying to figure out how the following code works The following code is inside a class in a module. The method is called later with the following code: @something ||= Module::Class.config class << self def config &block options = OpenStruct.new yield options if block_given? init_client! Client.new(options) end def init_client!(client) base_eigenclass = class << Base; self; end base_eigenclass.send :define_method, :client do @client = client end client end end The class has some constants in it, and when the classes initialize is called, the instance member are set to option.variable || VARIABLE_CONSTANT. I understand that if there is no value for option.variable then VARIABLE_CONSTANT is used, but I don't understand that calling Module::Class.config do |options| #some block end set the @client until config is called again with options The code definitely works, but I want to understand how it does

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PHP loading / including files only if class is used

- by MrMalayev

I have a couple of classes, and certain classes require only a part of an SDK. For example class a { /* requires filea.php*/ } class b { /*requires fileb.php*/ } Instead of including the files at the top like require_once 'filea.php'; require_once 'fileb.php'; class a { /*do stuff*/ } class b { /*do stuff*/ } Can I just include them in the class, so one only loads when an object is made? class a { require filea.php; /*do stuff*/ } class b { require fileb.php; /*do stuff*/ }

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XSLT - Adding a class to something with a class?

- by Probocop

When using XSLT how do I apply a class to an element which already has a class? The way I'm doing it it replaces the class that is already present? How would I add the class in addition to the existing class? My code is as follows: <xsl:if test="data[@alias = 'off'] = 1"> <xsl:attribute name="class">off</xsl:attribute> </xsl:if> <xsl:if test="$currentPage/ancestor-or-self::node/@id = current()/@id"> <xsl:attribute name="class">active</xsl:attribute> </xsl:if> Thanks.

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name of the class that contains the method code

- by kdlp

I'm trying to find the name of the class that contains method code. In the example underneath I use self.__class__.__name__, but of course this returns the name of the class of which self is an instance and not class that contains the test() method code. b.test() will print 'B' while I would like to get 'A'. I looked into the inspect module documentation but did not find anything directly useful. class A: def __init__(self): pass def test(self): print self.__class__.__name__ class B(A): def __init__(self): A.__init__(self) a = A() b = B() a.test() b.test()

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Motherboard Wiring

- by JT

HI All, I bought a new case to put a motherboard in. Everything fits, I have done this before, but not in a long time! The case has wires for - Power SW - Reset SW - Power LED - HDD LED On the motherboard (ASUS M2NPV-VM) it is clearly labeled where these go, but I cannot remember where the black wire for each goes versus the colored wire? I don't want to put it backwards, wont I blow the motherboard?

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Who uses Zimbra Collaboration Suite and why?

- by AlberT

I am really curious about other people experiences and choices. After a long scouting, I found ZCS to be a really impressive solution, maybe the only real alternative to M$ Exchange. I'm very interested in opinions and case histories from users having already deployed Zimbra on their infrastructure or planning to do it. Both Community and Network edition cases are appreciated, pro and cons explained too :) Zimlets, addons, useful skins, Zimbra Desktop and other apps or mobile integration use case too of course.

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Administering Team Foundation Server 2010 Class resource links

- by John Alexander

Here are the resource links for the Administering Team Foundation Server 2010 Class from last week in Minneapolis. Microsoft® Visual Studio® 2010 and Team Foundation Server® 2010 RTM virtual machine for Microsoft® Virtual PC 2007 SP1 http://www.microsoft.com/downloads/en/details.aspx?FamilyID=5e13b15a-fd74-4cd7-b53e-bdf9456855bd Microsoft® Visual Studio® 2010 and Team Foundation Server® 2010 RTM virtual machine for Windows Virtual PC http://www.microsoft.com/downloads/en/details.aspx?FamilyID=509c3ba1-4efc-42b5-b6d8-0232b2cbb26e Microsoft® Visual Studio® 2010 and Team Foundation Server® 2010 RTM virtual machine for Windows Server 2008 Hyper-V http://www.microsoft.com/downloads/en/details.aspx?FamilyID=e0198b64-4acb-4709-b07f-359fb4d523bc Customizable process guidance http://blogs.msdn.com/b/allclark/archive/2010/08/12/customizable-process-guidance.aspx The 5 most read Visual Studio ALM help topics on MSDN http://blogs.msdn.com/b/allclark/archive/2010/11/12/the-5-most-read-visual-studio-alm-help-topics-on-msdn.aspx Inside TFS http://visualstudiomagazine.com/Articles/List/Inside-TFS.aspx Testing Topics http://msdn.microsoft.com/en-us/library/dd286594.aspx Blogs http://community.accentient.com http://geekswithblogs.net Branching Guide http://tfsbranchingguideiii.codeplex.com/ Great VSTS blog http://geekswithblogs.net/hinshelm/Default.aspx My Blog :D http://geekswithblogs.net/jalexander/Default.aspx Visual Studio Forums http://bit.ly/fE16u3 TFS Migration and Integration Solutions http://bit.ly/cLaBnT TFS Migration and Integration Tools (VS ALM Rangers) http://bit.ly/9tHWdG TFS Migration and Integration Platform (CodePlex) http://tfsintegration.codeplex.com Team Foundation Server SDK http://code.msdn.microsoft.com/TfsSdk Migrate and Integration Forum http://bit.ly/f4Lnps Team Foundation Server Widgets http://www.tfswidgets.com TFS Sdk http://code.msdn.microsoft.com/TfsSdk TFS Migration and Integration Solutions http://bit.ly/cLaBnT TFS Integration Tools Forum http://bit.ly/f4Lnps TFS Integration Tools http://bit.ly/9tHWdG TFS Integration Platform http://tfsintegration.codeplex.com VS Upgrade Guide http://vs2010upgradeguide.codeplex.com Updating an Upgraded Team Project to Access New Features http://bit.ly/9cCcMP Team Foundation Power Tools http://bit.ly/dfNVQk Team Foundation Administration Tool http://tfsadmin.codeplex.com Using Team Foundation Server Command-Line Tools http://bit.ly/hCyozJ Changing Groups and Permissions with TFSSecurity http://bit.ly/esIjgw Unofficial Prep guide for TFS 2010 Administration Exam (70-512) http://geekswithblogs.net/enriquelima/archive/2010/07/21/unofficial-prep-guide-for-tfs-2010-administration-exam-70-512.aspx Another Prep Guide http://bit.ly/bpO30R Professional Application Lifecycle Management with VS 2010 Book http://bit.ly/9rCIRj Search CodePlex for TFS related apps http://www.codeplex.com/site/search Visual Studio Gallery http://visualstudiogallery.com TFS Widgets http://tfswidgets.com Migrate from Visual SourceSafe http://bit.ly/8XPSRh Team Foundation Server MSSCCI Provider 2010 http://bit.ly/dst1OQ Attrice TFS Sidekicks www.attrice.info/cm/tfs Hosted TFS http://bit.ly/cMZdvp Manually Processing the Team Foundation Server 2010 Data Warehouse and Analysis Services Database http://bit.ly/aG5oEh TFS 2005, 2008 and 2010 Compatibility http://shrinkster.com/1dhj

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How To show document directory save image in thumbnail in cocos2d class

- by Anil gupta

I have just implemented multiple photo selection from iphone photo library and i am saving all selected photo in document directory every time as a array, now i want to show all saved images in my class from document directory as a thumbnail, i have tried some logic but my game getting crashing, My code is below. Any help will be appreciate. Thanks in advance. -(id) init { // always call "super" init // Apple recommends to re-assign "self" with the "super" return value if( (self=[super init])) { CCSprite *photoalbumbg = [CCSprite spriteWithFile:@"photoalbumbg.png"]; photoalbumbg.anchorPoint = ccp(0,0); [self addChild:photoalbumbg z:0]; //Background Sound // [[SimpleAudioEngine sharedEngine]playBackgroundMusic:@"Background Music.wav" loop:YES]; CCSprite *photoalbumframe = [CCSprite spriteWithFile:@"photoalbumframe.png"]; photoalbumframe.position = ccp(160,240); [self addChild:photoalbumframe z:2]; CCSprite *frame = [CCSprite spriteWithFile:@"Photo-Frames.png"]; frame.position = ccp(160,270); [self addChild:frame z:1]; /*_____________________________________________________________________________________*/ CCMenuItemImage * upgradebtn = [CCMenuItemImage itemFromNormalImage:@"AlbumUpgrade.png" selectedImage:@"AlbumUpgrade.png" target:self selector:@selector(Upgrade:)]; CCMenu * fMenu = [CCMenu menuWithItems:upgradebtn,nil]; fMenu.position = ccp(200,110); [self addChild:fMenu z:3]; NSError *error; NSFileManager *fM = [NSFileManager defaultManager]; NSString *documentsDirectory = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"]; NSLog(@"Documents directory: %@", [fM contentsOfDirectoryAtPath:documentsDirectory error:&error]); NSArray *allfiles = [fM contentsOfDirectoryAtPath :documentsDirectory error:&error]; directoryList = [[NSMutableArray alloc] init]; for(NSString *file in allfiles) { NSString *path = [documentsDirectory stringByAppendingPathComponent:file]; [directoryList addObject:file]; } NSLog(@"array file name value ==== %@", directoryList); CCSprite *temp = [CCSprite spriteWithFile:[directoryList objectAtIndex:0]]; [temp setTextureRect:CGRectMake(160.0f, 240.0f, 50,50)]; // temp.anchorPoint = ccp(0,0); [self addChild:temp z:10]; for(UIImage *file in directoryList) { // NSData *pngData = [NSData dataWithContentsOfFile:file]; // image = [UIImage imageWithData:pngData]; NSLog(@"uiimage = %@",image); // UIImage *image = [UIImage imageWithContentsOfFile:file]; for (int i=1; i<=3; i++) { for (int j=1;j<=3; j++) { CCTexture2D *tex = [[[CCTexture2D alloc] initWithImage:file] autorelease]; CCSprite *selectedimage = [CCSprite spriteWithTexture:tex rect:CGRectMake(0, 0, 67, 66)]; selectedimage.position = ccp(100*i,350*j); [self addChild:selectedimage]; } } } } return self; }

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How to fix - Parse error: syntax error, unexpected T_CLASS

- by user557015

Hi, I'm new to PHP, and i'm making a forum. all the files work except one file, add_topic.php. It gives me an error saying: Parse error: syntax error, unexpected T_CLASS in /home/a3885465/public_html/add_topic.php on line 25 I know it is probably on the lines: } else{ echo "ERROR"; } mysql_close(); but the whole code is below just in case. If you have any idea, it would be really appreciated, thanks! The Code for add_topic.php <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <meta http-equiv="Content-Style-Type" content="text/css"> <title></title> <meta name="Generator" content="Cocoa HTML Writer"> <meta name="CocoaVersion" content="1038.32"> <style type="text/css"> p.p1 {margin: 0.0px 0.0px 12.0px 0.0px; font: 12.0px Verdana; color: #009901} p.p2 {margin: 0.0px 0.0px 12.0px 0.0px; font: 12.0px Verdana; color: #3a00ff} span.s1 {color: #3a00ff} span.s2 {font: 12.0px 'Lucida Grande'; color: #3a00ff} span.s3 {font: 13.0px Courier; color: #404040} span.s4 {font: 12.0px 'Lucida Grande'} span.s5 {color: #009901} td.td1 {width: 566.0px; margin: 0.5px 0.5px 0.5px 0.5px} </style> </head> <body> <table cellspacing="0" cellpadding="0"> <tbody> <tr> <td valign="middle" class="td1"> <?php $host=""host""; // Host name $username="username"; // Mysql username $password="password"; // Mysql password $db_name="database_name"; // Database name $tbl_name="forum_question"; // Table name // Connect to server and select database. mysql_connect("$host", "$username", "$password")or die("cannot connect"); mysql_select_db("$db_name")or die("cannot select DB"); // get data that sent from form $topic=$_POST['topic']; $detail=$_POST['detail']; $name=$_POST['name']; $email=$_POST['email']; $datetime=date("d/m/y h:i:s"); //create date time $sql="INSERT INTO $tbl_name(topic, detail, name, email, datetime)VALUES('$topic', '$detail', '$name', '$email', '$datetime')"; $result=mysql_query($sql); if($result){ echo "Successful "; echo "<a href=main_forum.php>View your topic</a>"; } else{ echo "ERROR"; } mysql_close(); ?> </td> </tr> </tbody> </table> </body> </html> Thanks again!

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Switch Statement C++ - error C2046: illegal case, error C2043: illegal break

- by user318095

#include <iostream> #include <string> using namespace std; //void multiply(int b); int main() { float total = 0; float b = 0; cout << "Enter number: " << endl; cin >> b; char TorD; cout << "Would you like to times (*), divide (/), add (+) or minus (-) this number?" << endl; cin >> TorD; switch (TorD) case '*' : { int c=0; cout << "by how many?" << endl; cin >> c; total = b * c; cout <> c; total = b / c; cout <> c; total = b + c; cout <> c; total = b - c; cout << b << " - " << c << " = " << total << endl; } break; default: cout << "You did not correctly enter /, *, +, or - !!" << endl; //multiply(b); system("pause"); return 0; }

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Cheap desktop computer in 19" rack-mountable form-factor?

- by Alex Basson

I'm a high school teacher at a small private school. As of this year, we have SMARTBoards in every classroom (though I've had one in the class I share for two years now). The classrooms themselves don't have computers in them, so we teachers bring our laptops to class and connect them to the boards. This has several disadvantages: This takes a few minutes while we wait for the board to boot up and then orient the board to our individual laptop -- we have to do this every time b/c different teachers have different laptops requiring different orientations. This isn't ideal because when you only have 43 minutes per class period, waiting five minutes just to get started is a real waste. Carrying your laptop to class doesn't sound so bad until you consider that we're also carrying textbooks and piles of student papers, and we're carrying it all through crowded high school hallways. More than one laptop has fallen THUNK to the floor, with dire consequences. We feel we could eliminate the need to use our laptops with the SMARTBoards if we had a dedicated computer in each classroom hooked up to the board at all times. Each board set-up is connected to a podium with a standard 19" rack in it, currently housing a power supply and DVD player. There're plenty of rack spaces available. So I'm thinking: maybe we could get some inexpensive computers in a 19" rack-mountable form factor, install them in the podiums, and connect them to the boards on a permanent basis. Any suggestions?

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Parallelism in .NET – Part 10, Cancellation in PLINQ and the Parallel class

- by Reed

Many routines are parallelized because they are long running processes. When writing an algorithm that will run for a long period of time, its typically a good practice to allow that routine to be cancelled. I previously discussed terminating a parallel loop from within, but have not demonstrated how a routine can be cancelled from the caller’s perspective. Cancellation in PLINQ and the Task Parallel Library is handled through a new, unified cooperative cancellation model introduced with .NET 4.0. Cancellation in .NET 4 is based around a new, lightweight struct called CancellationToken. A CancellationToken is a small, thread-safe value type which is generated via a CancellationTokenSource. There are many goals which led to this design. For our purposes, we will focus on a couple of specific design decisions: Cancellation is cooperative. A calling method can request a cancellation, but it’s up to the processing routine to terminate – it is not forced. Cancellation is consistent. A single method call requests a cancellation on every copied CancellationToken in the routine. Let’s begin by looking at how we can cancel a PLINQ query. Supposed we wanted to provide the option to cancel our query from Part 6: double min = collection .AsParallel() .Min(item => item.PerformComputation()); .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; } We would rewrite this to allow for cancellation by adding a call to ParallelEnumerable.WithCancellation as follows: var cts = new CancellationTokenSource(); // Pass cts here to a routine that could, // in parallel, request a cancellation try { double min = collection .AsParallel() .WithCancellation(cts.Token) .Min(item => item.PerformComputation()); } catch (OperationCanceledException e) { // Query was cancelled before it finished } .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; } Here, if the user calls cts.Cancel() before the PLINQ query completes, the query will stop processing, and an OperationCanceledException will be raised. Be aware, however, that cancellation will not be instantaneous. When cts.Cancel() is called, the query will only stop after the current item.PerformComputation() elements all finish processing. cts.Cancel() will prevent PLINQ from scheduling a new task for a new element, but will not stop items which are currently being processed. This goes back to the first goal I mentioned – Cancellation is cooperative. Here, we’re requesting the cancellation, but it’s up to PLINQ to terminate. If we wanted to allow cancellation to occur within our routine, we would need to change our routine to accept a CancellationToken, and modify it to handle this specific case: public void PerformComputation(CancellationToken token) { for (int i=0; i<this.iterations; ++i) { // Add a check to see if we've been canceled // If a cancel was requested, we'll throw here token.ThrowIfCancellationRequested(); // Do our processing now this.RunIteration(i); } } With this overload of PerformComputation, each internal iteration checks to see if a cancellation request was made, and will throw an OperationCanceledException at that point, instead of waiting until the method returns. This is good, since it allows us, as developers, to plan for cancellation, and terminate our routine in a clean, safe state. This is handled by changing our PLINQ query to: try { double min = collection .AsParallel() .WithCancellation(cts.Token) .Min(item => item.PerformComputation(cts.Token)); } catch (OperationCanceledException e) { // Query was cancelled before it finished } PLINQ is very good about handling this exception, as well. There is a very good chance that multiple items will raise this exception, since the entire purpose of PLINQ is to have multiple items be processed concurrently. PLINQ will take all of the OperationCanceledException instances raised within these methods, and merge them into a single OperationCanceledException in the call stack. This is done internally because we added the call to ParallelEnumerable.WithCancellation. If, however, a different exception is raised by any of the elements, the OperationCanceledException as well as the other Exception will be merged into a single AggregateException. The Task Parallel Library uses the same cancellation model, as well. Here, we supply our CancellationToken as part of the configuration. The ParallelOptions class contains a property for the CancellationToken. This allows us to cancel a Parallel.For or Parallel.ForEach routine in a very similar manner to our PLINQ query. As an example, we could rewrite our Parallel.ForEach loop from Part 2 to support cancellation by changing it to: try { var cts = new CancellationTokenSource(); var options = new ParallelOptions() { CancellationToken = cts.Token }; Parallel.ForEach(customers, options, customer => { // Run some process that takes some time... DateTime lastContact = theStore.GetLastContact(customer); TimeSpan timeSinceContact = DateTime.Now - lastContact; // Check for cancellation here options.CancellationToken.ThrowIfCancellationRequested(); // If it's been more than two weeks, send an email, and update... if (timeSinceContact.Days > 14) { theStore.EmailCustomer(customer); customer.LastEmailContact = DateTime.Now; } }); } catch (OperationCanceledException e) { // The loop was cancelled } Notice that here we use the same approach taken in PLINQ. The Task Parallel Library will automatically handle our cancellation in the same manner as PLINQ, providing a clean, unified model for cancellation of any parallel routine. The TPL performs the same aggregation of the cancellation exceptions as PLINQ, as well, which is why a single exception handler for OperationCanceledException will cleanly handle this scenario. This works because we’re using the same CancellationToken provided in the ParallelOptions. If a different exception was thrown by one thread, or a CancellationToken from a different CancellationTokenSource was used to raise our exception, we would instead receive all of our individual exceptions merged into one AggregateException.

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SQL Server Master class winner

- by Testas

The winner of the SQL Server MasterClass competition courtesy of the UK SQL Server User Group and SQL Server Magazine! Steve Hindmarsh There is still time to register for the seminar yourself at: www.regonline.co.uk/kimtrippsql More information about the seminar Where: Radisson Edwardian Heathrow Hotel, London When: Thursday 17th June 2010 This one-day MasterClass will focus on many of the top issues companies face when implementing and maintaining a SQL Server-based solution. In the case where a company has no dedicated DBA, IT managers sometimes struggle to keep the data tier performing well and the data available. This can be especially troublesome when the development team is unfamiliar with the affect application design choices have on database performance. The Microsoft SQL Server MasterClass 2010 is presented by Paul S. Randal and Kimberly L. Tripp, two of the most experienced and respected people in the SQL Server world. Together they have over 30 years combined experience working with SQL Server in the field, and on the SQL Server product team itself. This is a unique opportunity to hear them present at a UK event which will: Debunk many of the ingrained misconceptions around SQL Server's behaviour Show you disaster recovery techniques critical to preserving your company's life-blood - the data Explain how a common application design pattern can wreak havoc in the database Walk through the top-10 points to follow around operations and maintenance for a well-performing and available data tier! Please Note: Agenda may be subject to change Sessions Abstracts KEYNOTE: Bridging the Gap Between Development and Production Applications are commonly developed with little regard for how design choices will affect performance in production. This is often because developers don't realize the implications of their design on how SQL Server will be able to handle a high workload (e.g. blocking, fragmentation) and/or because there's no full-time trained DBA that can recognize production problems and help educate developers. The keynote sets the stage for the rest of the day. Discussing some of the issues that can arise, explaining how some can be avoided and highlighting some of the features in SQL 2008 that can help developers and DBAs make better use of SQL Server, and troubleshoot when things go wrong. SESSION ONE: SQL Server Mythbusters It's amazing how many myths and misconceptions have sprung up and persisted over the years about SQL Server - after many years helping people out on forums, newsgroups, and customer engagements, Paul and Kimberly have heard it all. Are there really non-logged operations? Can interrupting shrinks or rebuilds cause corruption? Can you override the server's MAXDOP setting? Will the server always do a table-scan to get a row count? Many myths lead to poor design choices and inappropriate maintenance practices so these are just a few of many, many myths that Paul and Kimberly will debunk in this fast-paced session on how SQL Server operates and should be managed and maintained. SESSION TWO: Database Recovery Techniques Demo-Fest Even if a company has a disaster recovery strategy in place, they need to practice to make sure that the plan will work when a disaster does strike. In this fast-paced demo session Paul and Kimberly will repeatedly do nasty things to databases and then show how they are recovered - demonstrating many techniques that can be used in production for disaster recovery. Not for the faint-hearted! SESSION THREE: GUIDs: Use, Abuse, and How To Move Forward Since the addition of the GUID (Microsoft’s implementation of the UUID), my life as a consultant and "tuner" has been busy. I’ve seen databases designed with GUID keys run fairly well with small workloads but completely fall over and fail because they just cannot scale. And, I know why GUIDs are chosen - it simplifies the handling of parent/child rows in your batches so you can reduce round-trips or avoid dealing with identity values. And, yes, sometimes it's even for distributed databases and/or security that GUIDs are chosen. I'm not entirely against ever using a GUID but overusing and abusing GUIDs just has to be stopped! Please, please, please let me give you better solutions and explanations on how to deal with your parent/child rows, round-trips and clustering keys! SESSION 4: Essential Database Maintenance In this session, Paul and Kimberly will run you through their top-ten database maintenance recommendations, with a lot of tips and tricks along the way. These are distilled from almost 30 years combined experience working with SQL Server customers and are geared towards making your databases more performant, more available, and more easily managed (to save you time!). Everything in this session will be practical and applicable to a wide variety of databases. Topics covered include: backups, shrinks, fragmentation, statistics, and much more! Focus will be on 2005 but we'll explain some of the key differences for 2000 and 2008 as well. Speaker Biographies Kimberley L. Tripp Paul and Kimberly are a husband-and-wife team who own and run SQLskills.com, a world-renowned SQL Server consulting and training company. They are both SQL Server MVPs and Microsoft Regional Directors, with over 30 years of combined experience on SQL Server. Paul worked on the SQL Server team for nine years in development and management roles, writing many of the DBCC commands, and ultimately with responsibility for core Storage Engine for SQL Server 2008. Paul writes extensively on his blog (SQLskills.com/blogs/Paul) and for TechNet Magazine, for which he is also a Contributing Editor. Kimberly worked on the SQL Server team in the early 1990s as a tester and writer before leaving to found SQLskills and embrace her passion for teaching and consulting. Kimberly has been a staple at worldwide conferences since she first presented at TechEd in 1996, and she blogs at SQLskills.com/blogs/Kimberly. They have written Microsoft whitepapers and books for SQL Server 2000, 2005 and 2008, and are regular, top-rated presenters worldwide on database maintenance, high availability, disaster recovery, performance tuning, and SQL Server internals. Together they teach the SQL MCM certification and throughout Microsoft.In their spare time, they like to find frogfish in remote corners of the world. Speaker Testimonials "To call them good trainers is an epic understatement. They know how to deliver technical material in ways that illustrate it well. I had to stop Paul at one point and ask him how long it took to build a particular slide because the animations were so good at conveying a hard-to-describe process." "These are not beginner presenters, and they put an extreme amount of preparation and attention to detail into everything that they do. Completely, utterly professional." "When it comes to the instructors themselves, Kimberly and Paul simply have no equal. Not only are they both ultimate authorities, but they have endless enthusiasm about the material, and spot on delivery. If either ever got tired they never showed it, even after going all day and all week. We witnessed countless demos over the course of the week, some extremely involved, multi-step processes, and I can’t recall one that didn’t go the way it was supposed to." "You might think that with this extreme level of skill comes extreme levels of egotism and lack of patience. Nothing could be further from the truth. ... They simply know how to teach, and are approachable, humble, and patient." "The experience Paul and Kimberly have had with real live customers yields a lot more information and things to watch out for than you'd ever get from documentation alone." “Kimberly, I just wanted to send you an email to let you know how awesome you are! I have applied some of your indexing strategies to our website’s homegrown CMS and we are experiencing a significant performance increase. WOW....amazing tips delivered in an exciting way! Thanks again”

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