Java多线程-工具篇-BlockingQueue

• 使用BlockingQueue实现写入日志队列。
• 多用于生产者-消费者模式

<pre>
以下是基于典型的生产者-使用者场景的一个用例。注意，BlockingQueue 可以安全地与多个生产者和多个使用者一起使用。

class Producer implements Runnable {
private final BlockingQueue queue;
Producer(BlockingQueue q) { queue = q; }
public void run() {
try {
while(true) { queue.put(produce()); }
} catch (InterruptedException ex) { ... handle ...}
}
Object produce() { ... }
}

class Consumer implements Runnable {
private final BlockingQueue queue;
Consumer(BlockingQueue q) { queue = q; }
public void run() {
try {
while(true) { consume(queue.take()); }
} catch (InterruptedException ex) { ... handle ...}
}
void consume(Object x) { ... }
}

class Setup {
void main() {
BlockingQueue q = new SomeQueueImplementation();//某一个实现类
Producer p = new Producer(q);
Consumer c1 = new Consumer(q);
Consumer c2 = new Consumer(q);
new Thread(p).start();
new Thread(c1).start();
new Thread(c2).start();
}
}

</pre>
内存一致性效果：当存在其他并发 collection 时，将对象放入BlockingQueue
之前的线程中的操作 happen-before后通过另一线程从 BlockingQueue 中访问或移除该元素的操作。

实现类的对比--ArrayBlockingQueue vs ConcurrentLinkedQueue vs LinkedBlockingQueue vs LinkedList
As you can see from the provided performance results LinkedBlockingQueue achieved the best combined (adding and removing elements) performance results and should be your number one candidate for implementing producer – consumer schenarios.

• Java Best Practices – Queue battle and the Linked ConcurrentHashMap

参考文档

• Java多线程-工具篇-BlockingQueue
• 官方文档