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javaµÄÏ̳߳ØÊµÏÖ£¬ThreadPool
package net.zj.hz.yk.threadpool;
import java.util.LinkedList;
public class ThreadPool extends ThreadGroup {
private boolean isClosed = false; // Ï̳߳ØÊÇ·ñ¹Ø±Õ
private LinkedList workQueue; // ¹¤×÷¶ÓÁÐ
private static int threadPoolID = 1; // Ï̳߳صÄid
public ThreadPool(int poolSize) {
super(threadPoolID + "");// Ö¸¶¨ThreadGroupµÄÃû³Æ
setDaemon(true); // ¼Ì³Ðµ½µÄ·½·¨£¬ÉèÖÃÊÇ·ñÊØ»¤Ï̳߳Ø
workQueue = new LinkedList(); // ´´½¨¹¤×÷¶ÓÁÐ
for (int i = 0; i < poolSize; i++) {
new WorkThread(i).start(); // ´´½¨²¢Æô¶¯¹¤×÷Ïß³Ì,Ï̳߳ØÊýÁ¿ÊǶàÉپʹ´½¨¶àÉÙ¸ö¹¤×÷Ïß³Ì
}
}
/** µÈ´ý¹¤×÷Ḭ̈߳ÑËùÓÐÈÎÎñÖ´ÐÐÍê±Ï */
public void waitFinish() {
synchronized (this) {
isClosed = true;
notifyAll(); // »½ÐÑËùÓл¹ÔÚgetTask()·½·¨ÖеȴýÈÎÎñµÄ¹¤×÷Ïß³Ì
}
// activeCount() ·µ»Ø¸ÃÏß³Ì×éÖлÏ̵߳ĹÀ¼ÆÖµ¡£
Thread[] threads = new Thread[activeCount()];
// enumerate()·½·¨¼Ì³Ð×ÔThreadGroupÀ࣬¸ù¾Ý»î¶¯Ï̵߳ĹÀ¼ÆÖµ»ñµÃÏß³Ì×éÖе±Ç°ËùÓлµÄ¹¤×÷Ïß³Ì
int count = enumerate(threads);
for (int i = 0; i < count; i++) { // µÈ´ýËùÓй¤×÷Ï߳̽áÊø
try {
threads[i].join(); // µÈ´ý¹¤×÷Ï߳̽áÊø
} catch (InterruptedException ex) {
ex.printStackTrace();
}
}
}
/** ¹Ø±ÕÏß³Ì³Ø */
public synchronized void closePool() {
if (!isClosed) {
// µÈ´ý¹¤×÷Ïß³ÌÖ´ÐÐÍê±Ï
waitFinish();
isClosed = true;
// Çå¿Õ¹¤×÷¶ÓÁÐ
workQueue.clear();
// ÖжÏÏ̳߳ØÖеÄËùÓеŤ×÷Ïß³Ì,´Ë·½·¨¼Ì³Ð×ÔThreadGroupÀà
interrupt();
}
}
/** Ïò¹¤×÷¶ÓÁÐÖмÓÈëÒ»¸öÐÂÈÎÎñ,Óɹ¤×÷Ïß³ÌÈ¥Ö´ÐиÃÈÎÎñ */
public synchronized void execute(Runnable task) {
if (isClosed) {
throw new IllegalStateException();
}
if (task != null) {
// Ïò¶ÓÁÐÖмÓÈëÒ»¸öÈÎÎñ
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