Android RXJava2内存性能 [英] Android RXJava2 memory performance

问题描述

我创建了一个Observable(RxJava2 + Volley)，每5秒重复一次，
它可以工作，但是当我转储 Java堆(内存)时，我的 Model JAVA类的实例很多，并且每当Observable重复执行一次，它就会增加. br> 为什么RX创建我的模型的几个实例?我怎么只能使用它的一个实例?

I created an Observable(RxJava2 + Volley) that repeat for each 5 seconds,
It works but when I Dump Java Heap(memory),there are many Instance of my Model JAVA class,and it will increase for each time that the Observable get repeating.
Why RX create several instance of my model? How can I use only ONE instance of it?

模型

public RequestFuture<String> getLiveRefreshFuture() {
        RequestFuture<String> future = RequestFuture.newFuture();
        VolleyStringRequest request = new VolleyStringRequest(Request.Method.POST
                , REFRESH_URL
                , future
                , future) {
            @Override
            protected Map<String, String> getParams() throws AuthFailureError {
                return getRefreshParams();
            }
        };

        VolleySingleton.getInstance().addToRequestQueue(request);
        return future;
    }    

---

活动

    private final CompositeDisposable disposables = new CompositeDisposable();

final LiveRemoteModel model = DaggerLiveComponent.builder().build().getModel();

        Observable<LiveResponse> observable = Observable
                .interval(Constants.TOOLBAR_BADGES_REFRESH_DELAY, TimeUnit.SECONDS)
                .subscribeOn(Schedulers.io())
                .map(dummy -> model.getLiveRefreshFuture())
                .map(RequestFuture::get)
                .map(LiveResponse::new)
                .observeOn(AndroidSchedulers.mainThread());

        DisposableObserver<LiveResponse> disposableObserver =
                new DisposableObserver<LiveResponse>() {
                    @Override
                    public void onNext(@NonNull LiveResponse liveResponse) {
                        setToolbarBadges(liveResponse.getToolbarBadges());
                    }

                    public void onError(@NonNull Throwable e) {
                        Log.e("RX", "onError: ", e);
                    }

                    @Override
                    public void onComplete() {
                        Log.d("RX", "onComplete: ");
                    }
                };

        disposables.add(observable.subscribeWith(disposableObserver));    

推荐答案

为什么RX创建我的模型的几个实例?我怎么只能使用它的一个实例?

Why RX create several instance of my model? How can I use only ONE instance of it?

如果仔细看，堆转储中的对象是LiveRemoteModel$2，表明它是LiveRemoteModel中的匿名类.

If you look carefully the object in the heapdump is LiveRemoteModel$2 which indicates it is an anonymous class within LiveRemoteModel.

查看您的代码，这很可能是每次调用model.getLiveRefreshFuture()时都会创建的VolleyStringRequest对象.在RX管道中没有保留该对象的任何东西，因此Volley中一定有保留它的对象.

Looking at your code this is probably the VolleyStringRequest object that gets created each time model.getLiveRefreshFuture() is called. There is nothing retaining that object within the RX pipeline so there must be something within Volley retaining it.

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