produceÈÕÖ¾Ö®ºó£¬¼´£ºÍ¬Ò»ÈÎÎñµÄÏû·ÑÐÐΪһ¶¨·¢ÉúÔÚÉú²úÐÐΪ֮ºó¡£»º³åÇøµÄÈÝÁ¿Áô¸ø¶ÁÕßÑéÖ¤¡£·ûºÏÁ½¸öÑéÖ¤Ìõ¼þ¡£
BlockingQueueд·¨µÄºËÐÄÖ»ÓÐÁ½ÐдúÂ룬²¢·¢ºÍÈÝÁ¿¿ØÖƶ¼·â×°ÔÚÁËBlockingQueueÖУ¬ÕýÈ·ÐÔÓÉBlockingQueue±£Ö¤¡£ÃæÊÔÖÐÊ×Ñ¡¸Ãд·¨£¬×ÔÈ»ÃÀ¹Û¼òµ¥¡£
ʵÏÖ¶þ£ºwait && notify
Èç¹û²»Äܽ«²¢·¢ÓëÈÝÁ¿¿ØÖƶ¼·â×°ÔÚ»º³åÇøÖУ¬¾ÍÖ»ÄÜÓÉÏû·ÑÕßÓëÉú²úÕßÍê³É¡£×î¼òµ¥µÄ·½°¸ÊÇʹÓÃÆÓËصÄwait && notify»úÖÆ¡£
public class WaitNotifyModel implements Model {
private final Object BUFFER_LOCK = new Object();
private final Queue<Task> buffer = new LinkedList<>();
private final int cap;
private final AtomicInteger increTaskNo = new AtomicInteger(0);
public WaitNotifyModel(int cap) {
this.cap = cap;
}
@Override
public Runnable newRunnableConsumer() {
return new ConsumerImpl();
}
@Override
public Runnable newRunnableProducer() {
return new ProducerImpl();
}
private class ConsumerImpl extends AbstractConsumer implements Consumer, Runnable {
@Override
public void consume() throws InterruptedException {
synchronized (BUFFER_LOCK) {
while (buffer.size() == 0) {
BUFFER_LOCK.wait();
}
Task task = buffer.poll();
assert task != null;
// ¹Ì¶¨Ê±¼ä·¶Î§µÄÏû·Ñ£¬Ä£ÄâÏà¶ÔÎȶ¨µÄ·þÎñÆ÷´¦Àí¹ý³Ì
Thread.sleep(500 + (long) (Math.random() * 500));
System.out.println("consume: " + task.no);
BUFFER_LOCK.notifyAll();
}
}
}
private class ProducerImpl extends AbstractProducer implements Producer, Runnable {
@Override
public void produce() throws InterruptedException {
// ²»¶¨ÆÚÉú²ú£¬Ä£ÄâËæ»úµÄÓû§ÇëÇó
Thread.sleep((long) (Math.random() * 1000));
synchronized (BUFFER_LOCK) {
while (buffer.size() == cap) {
BUFFER_LOCK.wait();
}
Task task = new Task(increTaskNo.getAndIncrement());
buffer.offer(task);
System.out.println("produce: " + task.no);
BUFFER_LOCK.notifyAll();
}
}
}
public static void main(String[] args) {
Model model = new WaitNotifyModel(3);
for (int i = 0; i < 2; i++) {
new Thread(model.newRunnableConsumer()).start();
}
for (int i = 0; i < 5; i++) {
new Thread(model.newRunnableProducer()).start();
}
}
}
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ÆÓËصÄwait && notify»úÖƲ»ÄÇôÁé»î£¬µ«×ã¹»¼òµ¥¡£synchronized¡¢wait¡¢notifyAllµÄÓ÷¨¿É²Î¿¼¡¾Java²¢·¢±à³Ì¡¿Ö®Ê®£ºÊ¹ÓÃwait/notify/notifyAllʵÏÖÏ̼߳äͨÐŵļ¸µãÖØҪ˵Ã÷£¬×ÅÖØÀí½â»½ÐÑÓëËø¾ºÕùµÄÇø±ð¡£
ʵÏÖÈý£º¼òµ¥µÄLock && Condition
ÎÒÃÇÒª±£Ö¤Àí½âwait && notify»úÖÆ¡£ÊµÏÖʱ¿ÉÒÔʹÓÃObjectÀàÌṩµÄwait()·½·¨ÓënotifyAll()·½·¨£¬µ«¸üÍƼöµÄ·½Ê½ÊÇʹÓÃjava.util.concurrent°üÌṩµÄLock && Condition¡£
public class LockConditionModel1 implements Model {
private final Lock BUFFER_LOCK = new ReentrantLock();
private final Condition BUFFER_COND = BUFFER_LOCK.newCondition();
private final Queue<Task> buffer = new LinkedList<>();
private final int cap;
private final AtomicInteger increTaskNo = new AtomicInteger(0);
public LockConditionModel1(int cap) {
this.cap = cap;
}
@Override
public Runnable newRunnableConsumer() {
return new ConsumerImpl();
}
@Override
public Runnable newRunnableProducer() {
return new ProducerImpl();
}
private class ConsumerImpl extends AbstractConsumer implements Consumer, Runnable {
@Override
public void consume() throws InterruptedException {
BUFFER_LOCK.lockInterruptibly();
try {
while (buffer.size() == 0) {
BUFFER_COND.await();
}
Task task = buffer.poll();
assert task != null;
// ¹Ì¶¨Ê±¼ä·¶Î§µÄÏû·Ñ£¬Ä£ÄâÏà¶ÔÎȶ¨µÄ·þÎñÆ÷´¦Àí¹ý³Ì
Thread.sleep(500 + (long) (Math.random() * 500));
System.out.println("consume: " + task.no);
BUFFER_COND.signalAll();