rxjava多线程切换

最新推荐文章于 2022-05-19 12:46:08 发布

Pizza_Lawson

最新推荐文章于 2022-05-19 12:46:08 发布

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本文通过四个示例展示了RxJava中不同线程调度器的使用方式，包括操作符和订阅者运行在不同线程上的情况。这些示例帮助理解Observable、操作符及订阅者如何在不同线程间交互。

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public static void main(String[] args) {
    Observable.fromCallable(thatReturnsNumberOne())     // the Observable
            .map(numberToString())                      // the Operator
            .subscribe(printResult());                  // the Subscriber
}

/*
    Output of the above program:
    ---------------------------
    Observable thread: main
    Operator thread: main
    Subscriber thread: main
    Result: 1
*/

        
private Callable<Integer> thatReturnsNumberOne() {
    return () -> {
        System.out.println("Observable thread: " + Thread.currentThread().getName());
        return 1;
    };
}

private Func1<Integer, String> numberToString() {
    return number -> {
        System.out.println("Operator thread: " + Thread.currentThread().getName());
        return String.valueOf(number);
    };
}

private Action1<String> printResult() {
    return result -> {
        System.out.println("Subscriber thread: " + Thread.currentThread().getName());
        System.out.println("Result: " + result);
    };
}

public static void main(String[] args) {
    Observable.fromCallable(thatReturnsNumberOne())
            .map(numberToString())
            .observeOn(Schedulers.newThread())      // subscriber on different thread
            .subscribe(printResult());
}
/*
    Output of the above program:
    ---------------------------
    Observable thread: main
    Operator thread: main
    Subscriber thread: RxNewThreadScheduler-1
    Result: 1
*/

public static void main(String[] args) {
    Observable.fromCallable(thatReturnsNumberOne())
            .observeOn(Schedulers.newThread())      // operator on different thread
            .map(numberToString())
            .subscribe(printResult());
}
/*
    Output of the above program:
    ---------------------------
    Observable thread: main
    Operator thread: RxNewThreadScheduler-1
    Subscriber thread: RxNewThreadScheduler-1
    Result: 1
*/

public static void main(String[] args) {
    Observable.fromCallable(thatReturnsNumberOne())
            .observeOn(Schedulers.newThread())      // operator on different thread
            .map(numberToString())
            .observeOn(Schedulers.newThread())      // subscriber on different thread
            .subscribe(printResult());
}
/*
    Output of the above program:
    ---------------------------
    Observable thread: main
    Operator thread: RxNewThreadScheduler-2
    Subscriber thread: RxNewThreadScheduler-1
    Result: 1
*/