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A ReaderWriterLock selectively allows access to data It allows multiple threads to acquire a reader lock, which is acquired when the thread will be performing only read operations Nothing keeps an errant thread from acquiring a reader lock and performing write operations Care should be taken to ensure that only read operations occur in a region guarded by a read lock The power of a ReaderWriterLock is that it allows read operations to be logically separated from write operations Since multiple read operations do not result in data corruption, there is no reason that multiple threads cannot simultaneously read a variable without ill effects To acquire a read lock, we invoke the AcquireReadLock method on the instance of the lock we wish to acquire AcquireReadLock accepts a timeout value as its only parameter.

We have three primary goals in this chapter:

In this section, we walk you through the process of building a web service to be used in the contacts-management system you built in chapter 3 The web service simply returns an ADONET DataSet object to be processed by your application One of the really neat things about building web services with Visual Studio NET is that if you know how to write a function (or subroutine in Visual Basic NET), you already know how to build a web service Other development platforms require a little more work, but the end result is the same: a request comes into a web server, the request is processed, and the response is generated and returned to the caller in XML format For simplicity, our web service contains one method called GetAllContacts, which returns an ADONET DataSet object.

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The following TestSessionBean session bean class makes use of the session bean adapter class:

Filter filter = new QueryWrapperFilter( query ); return filter; }

To begin, first create a web service project, and then add a web service item named Contactasmx to the solution When the project is created, Visual Studio NET automatically creates a virtual directory inside IIS and places your files into that virtual directory The web service integration with Visual Studio NET is unique to the product Though you can create web services easily with any Java integrated development environment (IDE), the deployment and testing features of Java web services is not as robust as in Visual Studio NET Our Contactasmx file is a special type of web page that is designed to expose web services over your intranet or the Internet As you can see in listing 78, the web service is simply a class called Contact that inherits the SystemWebServicesWebService NET Framework class.

As with many other synchronization methods, the timeout can either be an integer specifying the number of milliseconds to wait or an instance of the TimeSpan class In listing 91, we pass in the constant TimeoutInfinite to indicate we wish to wait indefinitely until we are able to acquire a read lock We are assured that when the method returns we have acquired a read lock As a general rule, using TimeoutInfinite is a bad idea A better approach is to supply a timeout value because it removes the possibility of a ReaderWriterLock-related deadlock To keep this chapter s examples simple, we use TimeoutInfinite Once a thread has acquired a read lock, it can perform any reads that are required, and once those reads are complete it should release the lock using the ReleaseReadLock method.

Equation 12.28 Lucene s interpretation of the vector space scoring formula, which takes much more into account

This will give your web service all of the methods and properties it needs to execute as a web service Notice in the VBNET code example that we applied the WebService attribute to the class This step is not required but allows you to specify metadata about the class stored with its manifest We only specified the default namespace, but you could also set values for a description and a name..

Syntax element Categories Classes Messages Properties Protocols @

The number of calls to ReleaseReadLock must match the number of calls to AcquireReadLock If a thread fails to release the lock the same number of times it acquires the lock a write lock will not be granted to other threads This will lead to deadlock if TimeoutInfinite is being used, as well as stopping the granting of any write locks..

When you re using the Microsoft Ajax Library, the pageLoad function is the best place to execute the client code. Handling the window.load event isn t safe because the library handles it to perform the runtime initialization. It's always safe to run the code during the load stage of the client-page lifecycle, because the runtime initialization is complete, all the script files referenced through the ScriptManager control have been loaded, and all the client components have been created and initialized.

PS (5) > [reflection.assembly]::Load( >> "System.Windows.Forms, Version=2.0.0.0, Culture=neutral," + >> "PublicKeyToken=b77a5c561934e089") >> GAC --True Version ------v2.0.50727 Location -------C:\WINDOWS\assembly\GAC_MSIL\System.Win...

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