A companion Observer for DisposableManager.

DisposingObserver.java

public class DisposingObserver<T> implements Observer<T> {
    @Override
    @CallSuper
    public void onSubscribe(Disposable d) {
        DisposableManager.add(d);
    }

    @Override
    public void onNext(T next) {}

    @Override
    public void onError(Throwable e) {}

    @Override
    public void onComplete() {}
}