Java多线程之Future设计模式
目录
- Future -> 代表的是未来的一个凭据
- AsynFuture -> Future具体实现类
- FutureService -> 桥接Future和FutureTask
- FutureTask -> 将你的调用逻辑进行了隔离
Future -> 代表的是未来的一个凭据
public interface Future<T> { T get() throws InterruptedException; }
AsynFuture -> Future具体实现类
public class AsynFuture<T> implements Future<T> { private volatile boolean done = false; private T result; public void done(T result){ synchronized (this){ this.result = result; this.done = true; this.notifyAll(); } } /** * 轮询 没有完成等待 */ @Override public T get() throws InterruptedException { synchronized (this) { while (!done) { this.wait(); } } return result; } }
FutureService -> 桥接Future和FutureTask
public class FutureService { /** * 需进程等待 */ public <T> Future<T> submit(final FutureTask<T> task) { AsynFuture<T> asynFuture = new AsynFuture<>(); new Thread(() -> { T result = task.call(); asynFuture.done(result); }).start(); return asynFuture; } /** * 运行完 自动回调 * 无需进程等待 */ public <T> Future<T> submit(final FutureTask<T> task, final Consumer<T> consumer) { AsynFuture<T> asynFuture = new AsynFuture<>(); new Thread(() -> { T result = task.call(); asynFuture.done(result); consumer.accept(result); }).start(); return asynFuture; } }
FutureTask -> 将你的调用逻辑进行了隔离
public interface FutureTask<T> { T call(); }
需要时回调:
/** * Future -> 代表的是未来的一个凭据 * FutureTask -> 将你的调用逻辑进行了隔离 * FutureService -> 桥接Future和FutureTask */ public class SyncInvoker { public static void main(String[] args) throws InterruptedException { FutureService futureService = new FutureService(); Future<String> future = futureService.submit(() -> { try { Thread.sleep(10001); } catch (InterruptedException e) { e.printStackTrace(); } return "FINISH"; }); System.out.println("=============="); System.out.println("do other thing."); Thread.sleep(1000); System.out.println("=============="); /** * 调用也形成了阻塞 */ System.out.println(future.get()); } }
运行:
==============
do other thing.
==============
FINISH
运行完自动回调:
//** * Future -> 代表的是未来的一个凭据 * FutureTask -> 将你的调用逻辑进行了隔离 * FutureService -> 桥接Future和FutureTask */ public class SyncInvoker { public static void main(String[] args) throws InterruptedException { FutureService futureService = new FutureService(); futureService.submit(() -> { try { Thread.sleep(10001); } catch (InterruptedException e) { e.printStackTrace(); } return "FINISH"; },System.out::println); System.out.println("=============="); System.out.println("do other thing."); Thread.sleep(1000); System.out.println("=============="); } }
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