Java多线程设计模式
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该文档探讨了Java多线程设计模式，包括线程安全、死锁、单线程执行以及多个线程间的协作方法。具体示例展示了如何使用synchronized、guarded suspension、balking和生产者消费者模式来管理线程间共享资源和任务。最后，文档提到了一些设计思想和思考，强调了未来模式在提高效率方面的潜力。
![ProducerConsumerpublic class Table { private final String[] buffer; private int count; // buffer内的蛋糕数public synchronized void put(String cake) throws InterruptedException {while (count >= buffer.length) { wait(); } //加一块蛋糕notifyAll(); } public synchronized String take() throws InterruptedException {while (count <= 0) {wait(); }notifyAll(); return cake; //减一块蛋糕 }}](https://image.slidesharecdn.com/random-100716034214-phpapp02/85/Java-16-320.jpg)
Java多线程设计模式
- 4. SingleThreadedExecutionpublic class Gate { private String people= "Nobody"; private String address = "Nowhere"; public synchronized void pass(String people) { //只有一个人通过这扇门 } public String getGateName() { // }}
- 5. Immutable典型代表:String类例子:public final class Person {privatefinal String name; //no setter public Person(String name) { this.name = name; } public String getName() { return name; }}
- 8. GuardedSuspension public synchronized Request getRequest() { while (queue.size() <= 0) { //guard condition try { wait(); } catch (InterruptedException e) { } } return (Request)queue.removeFirst(); } public synchronized void putRequest(Request request) {queue.addLast(request);notifyAll(); }
- 10. Balking
- 11. Balkingpublic class Data { private boolean changed; public synchronized void change(String newContent) { content = newContent; changed = true; } public synchronized void save() throws IOException { if (!changed) {// 内容没有变化,返回 return; } doSave(); //实际资料储存到挡案里用的方法 changed = false; } }
- 12. Balking使用场景不需要刻意执行(doSave)不想等待警戒条件变化警戒条件只有第一次成立,如下private boolean done;public synchronized void init(){if (done) { return;}doInit(); done=true;}
- 14. ProducerConsumer
- 15. ProducerConsumer
- 16. ProducerConsumerpublic class Table { private final String[] buffer; private int count; // buffer内的蛋糕数public synchronized void put(String cake) throws InterruptedException {while (count >= buffer.length) { wait(); } //加一块蛋糕notifyAll(); } public synchronized String take() throws InterruptedException {while (count <= 0) {wait(); }notifyAll(); return cake; //减一块蛋糕 }}
- 18. Thread-Per-Message private final Helper helper = new Helper(); public void request(final int p1, final char p2) { new Thread() { public void run() {helper.handle(p1, p2); } }.start(); }
- 21. Future
- 22. Futurepublic Data create(final int param1, final char param1) { // (1) 建立FutureData的实体 final FutureData future = new FutureData(); // (2) 为了建立RealData的实体，启动新的线程 new Thread() { public void run() { RealDatarealdata = new RealData(param1, param2);future.setRealData(realdata); } }.start(); // (3)返回FutureData实体 return future; }
- 23. Futurepublic class RealData implements Data { private final String content; public RealData(int param1, char param2) {//do something, burn timethis.content = new String(buffer); } public String getContent() { return content; }}
- 24. Futurepublic class FutureData implements Data { private RealDatarealdata = null; private booleanready = false; public synchronized void setRealData(RealDatarealdata) { if (ready) return; // balkingthis.realdata = realdata;this.ready= true;notifyAll(); } public synchronized String getContent() { while (!ready) { //garded try { wait(); } catch (InterruptedException e) { } } return realdata.getContent(); }}
- 25. Callback与Future
- 27. つづく
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- 31. The Final Flight of the Osiris
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- 36. Beyond
- 37. Beyond