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("==============");
}
}
