拦截 GWT RequestFactory 请求

Question

有没有办法在客户端拦截RequestFactory请求？

我想拦截这样的调用：

dummyRequest.dummyOperation().fire( new Receiver<String>() {
  @Override
  public void onSuccess(String response) {        
  }
});

这个想法是在与服务器通信时显示一些加载指示。

Answer 1

您可以覆盖默认的传输实现并在 RF 初始化期间传递它：

SampleRequestFactory factory = GWT.create( SampleRequestFactory.class );
factory.initialize( new SimpleEventBus(), new DefaultRequestTransport() );

您可以继承 DefaultRequestTransport 并覆盖该方法

send(String payload, TransportReceiver receiver)

在调用超级实现之前进行一些处理并使用委托包装 TransportReceiver 来处理结果。

Answer 2

final DefaultRequestTransport requestTransport = new DefaultRequestTransport() {
        @Override
        public void send(final String payload, final TransportReceiver receiver) {
            GWT.log("making rpc");
            final TransportReceiver proxy = new TransportReceiver() {
                @Override
                public void onTransportFailure(final ServerFailure failure) {
                    GWT.log("rpc returned");
                    receiver.onTransportFailure(failure);
                }

                @Override
                public void onTransportSuccess(final String payload) {
                    GWT.log("rpc returned");
                    receiver.onTransportSuccess(payload);
                }
            };

            super.send(payload, proxy);

}