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gwt - 如果失败,如何重新发送 GWT RPC 请求(或如何创建持久的 RPC 请求)?

转载 作者:行者123 更新时间:2023-12-04 13:54:59 38 4
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如果失败(除 HTTP 200 之外的任何响应代码),我需要重试发送 GWT RPC 请求。原因很复杂,所以我不会详细说明。到目前为止,我在同一个地方处理所有请求响应,如下所示:

    // We override the RpcRequestBuilder.doSetCallback method and force your service to use it
// With this we can read the response headers if we need to.
((ServiceDefTarget)serviceRPC).setRpcRequestBuilder(new RpcRequestBuilder() {

@Override
protected void doSetCallback(RequestBuilder rb, final RequestCallback callback) {
super.doSetCallback(rb, new RequestCallback() {

@Override
public void onResponseReceived(Request request,
Response response) {
httpResponseOkHandler(callback, request, response);
}

@Override
public void onError(Request request, Throwable exception) {
httpResponseErrorHandler(callback, request, exception);
}
});
}
});

因此,使用 httpResponseOkHandler 方法,我可以捕获 HTTP 故障。但是,有没有办法“重新抛出”请求,即再试一次?我不想存储 RPC 请求的高级参数,我更愿意使用已经流式传输并准备重新发送的请求内容。

有任何想法吗?

最佳答案

嗯,自己找到了答案。所以它毕竟很整洁。在负载重的医院环境中工作,网络往往不可靠。所以这就是为什么我需要在放弃之前重新发送 rpc 请求几次。这是解决方案:

1- 设置您的特殊请求构建器以捕获所有请求响应,但保留请求构建器。

    ((ServiceDefTarget)serviceRPC).setRpcRequestBuilder(new RpcRequestBuilder() {

@Override
protected void doSetCallback(RequestBuilder rb, final RequestCallback callback) {
final RequestBuilder requestBuilder = rb;
super.doSetCallback(rb, new RequestCallback() {

@Override
public void onResponseReceived(Request request,
Response response) {
httpResponseOkHandler(requestBuilder, callback, request, response);
}

@Override
public void onError(Request request, Throwable exception) {
httpResponseErrorHandler(requestBuilder, callback, request, exception);
}
});
}
});

2- 现在使用请求构建器根据需要多次发送请求。一件很棒的事情是请求构建器已经设置并且数据被序列化,这避免了必须存储 POJO 未序列化的数据。
    // We had some server HTTP error response (we only expect code 200 from server when using RPC)
if (response.getStatusCode() != Response.SC_OK) {
Integer requestTry = requestValidation.get(requestBuilder.getRequestData());
if (requestTry == null) {
requestValidation.put(requestBuilder.getRequestData(), 1);
sendRequest(requestBuilder, callback, request);
}
else if (requestTry < MAX_RESEND_RETRY) {
requestTry += 1;
requestValidation.put(requestBuilder.getRequestData(), requestTry);
sendRequest(requestBuilder, callback, request);
} else {
InvocationException iex = new InvocationException("Unable to initiate the asynchronous service invocation -- check the network connection", null);
callback.onError(request, iex);
}
} else {
callback.onResponseReceived(request, response);
}

这对我来说很好用,请自行承担风险!

关于gwt - 如果失败,如何重新发送 GWT RPC 请求(或如何创建持久的 RPC 请求)?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/11056324/

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