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WritesDone C++异步服务器如何区分GRPC和断开的连接

WritesDone是gRPC C++库中的一个类,用于在异步服务器中标识完成写操作。它主要用于区分gRPC请求的完成状态和断开的连接。

在gRPC中,服务器通过异步处理来处理客户端的请求。当服务器接收到一个请求时,它会启动一个异步操作来处理该请求,并在操作完成后通知客户端。WritesDone类用于在异步操作完成时通知服务器。

区分gRPC请求的完成状态和断开的连接非常重要。当客户端断开连接时,服务器需要知道是因为请求已完成还是客户端主动断开了连接。WritesDone类提供了一种机制,使服务器能够区分这两种情况。

WritesDone类的使用方法如下:

  1. 在服务器的异步处理函数中,创建一个WritesDone对象。
  2. 在异步操作完成时,调用WritesDone对象的NotifyOnCancel()方法。
  3. 在异步操作完成后,通过WritesDone对象的IsCancelled()方法来判断操作是否被取消。

如果IsCancelled()方法返回true,表示操作被取消,即客户端断开了连接。如果返回false,表示操作完成,即请求已完成。

WritesDone类的使用示例代码如下:

代码语言:txt
复制
void AsyncProcessRequest(ServerContext* context, RequestType* request,
    grpc::ServerAsyncResponseWriter<ResponseType>* responder,
    grpc::CompletionQueue* cq, void* tag) {
  // 处理请求的异步操作

  // 创建WritesDone对象
  grpc::ServerContext::WritesDone writes_done(context);

  // 在异步操作完成时通知服务器
  writes_done.NotifyOnCancel(cq, tag);

  // 异步操作的其他处理

  // 异步操作完成后判断是否被取消
  if (writes_done.IsCancelled()) {
    // 客户端断开了连接
  } else {
    // 请求已完成
  }
}

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