如何在Java中异步调用方法 [英] How to asynchronously call a method in Java

问题描述

我最近一直在查看 Go的goroutines ，认为这会很好在Java中有类似的东西。至于我搜索的并行化方法调用的常见方法是做一些类似的事情：

I've been looking at Go's goroutines lately and thought it would be nice to have something similar in Java. As far as I've searched the common way to parallelize a method call is to do something like:

final String x = "somethingelse";
new Thread(new Runnable() {
           public void run() {
                x.matches("something");             
    }
}).start();

这不是很优雅。 有更好的方法吗？我需要这样一个解决方案，所以我决定在异步方法调用实现自己的包装类。

Thats not very elegant. Is there a better way of doing this? I needed such a solution in a project so I decided to implement my own wrapper class around a async method call.

我在 J-Go 中发布了我的包装类。但我不知道这是否是一个很好的解决方案。用法很简单：

I published my wrapper class in J-Go. But I don't know if it is a good solution. The usage is simple:

SampleClass obj = ...
FutureResult<Integer> res = ...
Go go = new Go(obj);
go.callLater(res, "intReturningMethod", 10);         //10 is a Integer method parameter
//... Do something else
//...
System.out.println("Result: "+res.get());           //Blocks until intReturningMethod returns

或更少verbose：

or less verbose:

Go.with(obj).callLater("myRandomMethod");
//... Go away
if (Go.lastResult().isReady())                //Blocks until myRandomMethod has ended
    System.out.println("Method is finished!");

在内部我使用一个实现Runnable的类，并做一些Reflection工作来获得正确的方法对象并调用它。

Internally I'm using a class that implements Runnable and do some Reflection work to get the correct method object and invoking it.

我想对我的小库和关于在Java中进行这样的异步方法调用的主题。它是安全吗？

I want some opinion about my tiny library and on the subject of making async method calls like this in Java. Is it safe? Is there already a simplier way?

推荐答案

我刚刚发现有一个更干净的方法来做你的

I just discovered that there is a cleaner way to do your

new Thread(new Runnable() {
    public void run() {
        //Do whatever
    }
}).start();

（至少在Java 8中），可以使用lambda表达式将其缩短为：

(At least in Java 8), you can use a lambda expression to shorten it to:

new Thread(() -> {
    //Do whatever
}).start();

就像在JS中创建一个函数一样简单！

As simple as making a function in JS!

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