Flowable subscribe流程介绍

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Flowable 的 subscribe 方法

public final Disposable subscribe() {
    return subscribe(Functions.emptyConsumer(), Functions.ON_ERROR_MISSING,
            Functions.EMPTY_ACTION, FlowableInternalHelper.RequestMax.INSTANCE);
}

public final Disposable subscribe(Consumer onNext) {
    return subscribe(onNext, Functions.ON_ERROR_MISSING,
            Functions.EMPTY_ACTION, FlowableInternalHelper.RequestMax.INSTANCE);
}

public final Disposable subscribe(Consumer onNext, Consumer onError) {
    return subscribe(onNext, onError, Functions.EMPTY_ACTION,
            FlowableInternalHelper.RequestMax.INSTANCE);
}

public final Disposable subscribe(Consumer onNext, Consumer onError,
                                  Action onComplete) {
    return subscribe(onNext, onError, onComplete,
            FlowableInternalHelper.RequestMax.INSTANCE);
}

public final Disposable subscribe(Consumer onNext, Consumer onError,
                                  Action onComplete, Consumer onSubscribe) {
    LambdaSubscriber ls = new LambdaSubscriber(onNext, onError, onComplete, onSubscribe);
    subscribe(ls);
    return ls;
}

public final void subscribe(Subscriber s) {
    if (s instanceof FlowableSubscriber) {
        subscribe((FlowableSubscriber)s);
    } else {
        ObjectHelper.requireNonNull(s, "s is null");
        subscribe(new StrictSubscriber(s));
    }
}

public final void subscribe(FlowableSubscriber s) {
    ObjectHelper.requireNonNull(s, "s is null");
    try {
        Subscriber z = RxJavaPlugins.onSubscribe(this, s);
        subscribeActual(z);
    } catch (...) {
       ...
    }
}

protected abstract void subscribeActual(Subscriber s);

前面四个方法都是调用了通过默认的：

• Functions.emptyConsumer() :

  static final class EmptyConsumer implements Consumer