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Easy Learn Java: Programming Articles, Examples and Tips - Page 194


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''Using Web Services Effectively'' - the online tutorial

Go to all tips in Good To Know

Good to read: "Using Web Services Effectively" - the online tutorial begins with a discussion of the Web service processing and interaction models. It describes the two principal Web service models -- a document-oriented model and a Remote Procedure Call-oriented model -- from which the synchronous and asynchronous Web service architectures are derived. Some of the issues to be considered for designing a Web service interface, including granularity of services, the Java API for XML-based Remote Procedure Call (JAX-RPC), and object-centric and document-centric parameter binding. After covering design issues, the document gives some guidelines on how to architect a Web service. It covers receiving and responding to requests, delegating to business logic, and exposing a Web service. To help illustrate, the document shows how the Java Pet Store sample application has implemented Web services using the J2EE technologies. Whenever possible, recommended practices are highlighted.
http://java.sun.com/blueprints/webservices/using/webservbp.html




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Posted by jalex on Friday, April 02, 2004 (00:00:00) (3435 reads)

Can I combine the two techniques to produce a thread that may be safely ''stoppe

Go to all tips in Threads

Question: Can I combine the two techniques to produce a thread that may be safely "stopped" or "suspended"?

Answer: Yes; it's reasonably straightforward. The one subtlety is that the target thread may already be suspended at the time that another thread tries to stop it. If the stop method merely sets the state variable (blinker) to null, the target thread will remain suspended (waiting on the monitor), rather than exiting gracefully as it should. If the applet is restarted, multiple threads could end up waiting on the monitor at the same time, resulting in erratic behavior.
To rectify this situation, the stop method must ensure that the target thread resumes immediately if it is suspended. Once the target thread resumes, it must recognize immediately that it has been stopped, and exit gracefully. Here's how the resulting run and stop methods look:

public void run() {
Thread thisThread = Thread.currentThread();
while (blinker == thisThread) {
try {
thisThread.sleep(interval);
synchronized(this) {
while (threadSuspended && blinker==thisThread)
wait();
}
} catch (InterruptedException e){
}
repaint();
}
}

public synchronized void stop() {
blinker = null;
notify();
}

If the stop method calls Thread.interrupt, as described above, it needn't call notify as well, but it still must be synchronized. This ensures that the target thread won't miss an interrupt due to a race condition.

this question/answer was published in SUN's article


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Posted by jalex on Thursday, April 01, 2004 (00:00:00) (3618 reads)

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