Use a Thread Group in Java

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Use a Thread Group
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Classes javalangThread javalangThreadGroup int activeCount( ) int enumerate(Thread[ ] thrds) final void interrupt( ) Methods
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In a large application it is not uncommon to have several separate, but related threads of execution In such a case, it is sometimes useful to deal with these threads collectively as a group, rather than individually For example, consider a situation in which multiple users
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are accessing a database One possible implementation is to create a separate thread for each user This way, the database queries can easily be handled asynchronously and independently If these threads are managed as a group, then some event that affects all of them, such as the loss of the network connection, can be easily handled by interrupting all threads in the group To handle groups of threads Java provides the ThreadGroup class, which is packaged in javalang This recipe demonstrates its use
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Using a thread group involves the following steps: 1 Create a ThreadGroup 2 Create each thread that will be part of the group, using one of Thread s constructors that enables the thread group to be specified 3 To obtain a list of the threads in the group, call enumerate( ) 4 To obtain an estimate of the number of active threads in the group, call activeCount( ) 5 To interrupt all threads in a group, call interrupt( ) on the ThreadGroup instance
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ThreadGroup defines two constructors The one used by this recipe is shown here: ThreadGroup(String name) The name of the ThreadGroup is passed in name Threads are added to a thread group when they are created Thread supplies several constructors that take a ThreadGroup argument The one used by this recipe is shown here: Thread(ThreadGroup tg, Runnable thrdObj, String name) The thread will become part of the ThreadGroup specified by tg A reference to an instance of a class that implements Runnable is passed in thrdObj The name of the thread is passed in thrdName (See Multithreading Fundamentals for details on the other Thread constructors) You can obtain a list of all threads in a group by using this form of enumerate( ): int enumerate(Thread[ ] thrds, boolean all) It returns all threads in the invoking ThreadGroup in the array referred to by thrds The number of threads actually stored in thrds is returned Be careful, however No error is reported if thrds is not large enough to hold all threads Therefore, the length of thrds must be sufficient to hold all active threads to avoid trouble You can obtain the number of active (non-terminated) threads in the group by calling activeCount( ), shown here int activeCount( ) It returns the number of active threads in the invoking ThreadGroup (and in any child groups that have the invoking group as a parent) Be aware, however, that if threads are in
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7:
Multithreading
the process of being added to the group or the process of being terminated, then the number returned might be inaccurate by the time you receive it You can interrupt all threads in a group by calling interrupt( ), shown next: nal void interrupt( ) Calling interrupt( ) on a ThreadGroup instance results in Thread s version of interrupt( ) being called on each thread in the group See Interrupt a Thread for details
Example
The following example demonstrates a thread group It creates four threads, displays the active count, enumerates the threads, stops one thread, displays the updated active count, and then interrupts the remaining threads
// Use a ThreadGroup class MyThread implements Runnable { private volatile boolean stopped; MyThread() { stopped = false; } // Run the thread public void run() { String thrdName = ThreadcurrentThread()getName(); Systemoutprintln(thrdName + " starting"); try { for(int i = 1; i < 1000; i++) { // Display periods Systemoutprint(""); Threadsleep(250); synchronized(this) { if(stopped) break; } } } catch (InterruptedException exc) { Systemoutprintln(thrdName + " interrupted"); } Systemoutprintln(thrdName + " exiting"); } // Stop the thread synchronized void myStop() { stopped = true; } }
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