JDeferredDeferred/Promise 库

JDeferred 是一个 Java 的 Deferred/Promise 库，类似 jQuery 的 Deffered 对象。

示例代码：

Deferred deferred = new DeferredObject();

Promise promise = deferred.promise();

promise.done(new DoneCallback() {

  public void onDone(Object result) {

    ...

  }

}).fail(new FailCallback() {

  public void onFail(Object rejection) {

    ...

  }

}).progress(new ProgressCallback() {

  public void onProgress(Object progress) {

    ...

  }

}).always(new AlwaysCallback() {

  public void onAlways(State state, Object result, Object rejection) {

    ...

  }

});