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In this statement: ProcName: Represents the name of the stored procedure. SQL statements: Represents the set of SQL statements in the stored procedure. Return: Represents the end of the procedure. Each stored procedure must end with a Return statement. After the stored procedure is created, the SQL server scrutinizes it for any errors. The procedure can be executed by using the Execute or Exec keyword, as follows: Execute ProcName You can also pass parameters or arguments to a stored procedure to perform a specific task based on the parameter. For example, consider the following procedure that displays the price of a product whose ID is passed as a parameter: Create Procedure ProductPrice (@id char (4)) As Select UnitPrice From Products Where ProductID=@id Return This procedure takes a parameter, @id, at the time of execution. To display the price of the product whose ID is "P001", execute this procedure using the following code: Execute ProductPrice "P001"

class FileApplication implements FileReaderClient { // Fragments private String[] filenames; private int currentCompletion; // index of ready file { public synchronized void readCompleted(String fn, byte[] d) // wait until ready to process this callback while (!fnequals(filenames[currentCompletion])) { try { wait(); } catch(InterruptedException ex) { return; } } // process data // wake up any other thread waiting on this condition: ++currentCompletion; notifyAll(); } public synchronized void readFailed(String fn, IOException e){ // similar } public synchronized void readfiles() { currentCompletion = 0; for (int i = 0; i < filenameslength; ++i) readerread(filenames[i],this);

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While completion callbacks are very flexible, they are at best awkward to use when a caller just needs to wait out a particular task that it started If an operation occurring in some thread A cannot continue until some thread B completes, you can block thread A via any of the waiting and notification techniques discussed in 3 For example, assuming the existence of a Latch (see 342) named terminated accessible from both threads A and B, thread A may wait via terminatedacquire(), and thread B may execute terminatedrelease() upon otherwise completing its task However, there is usually no reason to set up your own waiting and notification constructions, since this functionality is already provided by Threadjoin: The join method blocks the caller while the target isAlive Terminating threads automatically perform notifications The monitor object used internally for this waiting and notification is arbitrary and may vary across JVM implementations In most, the target Thread object itself is used as the monitor object (This is one reason for not extending class Thread to add run methods that invoke waiting or notification methods) In cases where these details of Threadjoin don't fit the needs of a particular application, you can always fall back to the manual approach Either Threadjoin or explicitly coded variants can be used in designs where a client needs a service to be performed but does not immediately rely on its results or effects (This is sometimes known as deferred-synchronous invocation) This is often the case when the service task is timeconsuming and can benefit from CPU and/or IO parallelism, so that running it in a separate thread can improve overall throughput One common application is image processing Obtaining the raw data for an image from a file or socket and then converting it into a form that can be displayed are time-consuming operations that involve both CPU and IO processing Often, this processing can be overlapped with other displayrelated operations A version of this strategy is used by javaawtMediaTracker and related classes, which should be used when they apply Here, we'll illustrate a more generic version that can be extended and refined in various ways to support specialized applications To set this up, suppose there is a generic Pic interface for images, and a Renderer interface describing services that accept a URL pointing to image data and ultimately return a Pic (In a more.

Table 1-1: Fragment of an ASP.NET Page Trace Category aspx.page Message End ProcessPostD ata Page_Load event handler started Page_Load event handler exit From First(s) 0.000551 From Last(s) 0.000158

realistic setting, the render method would surely also throw various failure exceptions Here, we will assume that it simply returns null on any failure) Also, assume existence of a StandardRenderer class implementing interface Renderer

Threadjoin can be used to write clients such as the following PictureApp class (which invokes several made-up methods just for the sake of illustration) It creates a Runnable waiter

The last two entries in Table 1-1 are custom Trace messages written using the PageTraceWrite(..) method Easy application deployment and maintenance Applications are often made up of several components: Web pages Windows forms-based components Web services Components housed in DLLs The NET Framework makes it possible to install applications that use some or all of these components without having to register DLLs (using regsvr32exe) or to create Registration Database (also known as the system Registry) entries The NET Framework makes it easy to deploy applications using zero-impact installation often all that's required to install an application is to copy it into a directory along with the components it requires This is possible because the NET Framework handles the details of locating and loading components an application needs, even if you have several versions of the same component available on a single system.

While it is common practice, the use of unsynchronized (or direct) access of internal result fields as seen in the waiter object is a bit delicate Since access is not synchronized, correctness relies on the fact that both thread termination and the join method intrinsically employ synchronized methods or blocks (see 227)

interface Pic { byte[] getImage(); } interface Renderer {

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