获取当前的回拨计数？

Question

是否可以获得当前运行的下面多少个回调？

(new AsyncCallback<List<data>>()
    {

        @Override
        public void onFailure(Throwable caught)
        {
        }

        @Override
        public void onSuccess(List<PersonalData> result)
        {

        }
    });

Answer 1

我使用自己的ExtendedAsyncCallback。它允许我在一些回调仍处于活动状态时阻止UI。请注意，它还允许我避免在每个回调中剪切和粘贴onFailure。

public class ExtendedAsyncCallback<T> implements AsyncCallback<T> {

    private static int activeCallbacks;

    public ExtendedAsyncCallback() {
        // here I block the UI and show a nice spinner
        activeCallbacks++;
    }

    @Override
    public void onFailure(Throwable caught) {
        activeCallbacks--;
        // show an error message depending on exception
    }

    @Override
    public void onSuccess(T result) {
        activeCallbacks--;
        if (activeCallbacks == 0) {
            // here I hide my spinner
        }
        execute(result);
    }

    public void execute(T result) {
        // I use this method in presenters instead of 'onSuccess'
    }

然后你打电话给：

(new ExtendedAsyncCallback<Object>() {

    @Override
    public void execute(Object result) {

    }
});