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Java多线程之Future设计模式

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这篇文章主要介绍了Java多线程之Future设计模式，Future 代表的是未来的一个凭据，文章主要附上Future具体实现类、桥接Future和FutureTask的代码,需要的朋友可以参考一下

Future -> 代表的是未来的一个凭据

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public interface Future<T> {
    T get() throws InterruptedException;
}

AsynFuture -> Future具体实现类

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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

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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

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public interface FutureTask<T> {
 
    T call();
}

需要时回调：

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/**
 * 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:

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//**
 * 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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原文链接：https://juejin.cn/post/7022215197204938783