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/*
*
* Copyright 2016, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#ifndef GRPCXX_IMPL_CODEGEN_SERVER_STREAMED_UNARY_H
#define GRPCXX_IMPL_CODEGEN_SERVER_STREAMED_UNARY_H
#include <grpc++/impl/codegen/call.h>
#include <grpc++/impl/codegen/completion_queue.h>
#include <grpc++/impl/codegen/core_codegen_interface.h>
#include <grpc++/impl/codegen/server_context.h>
#include <grpc++/impl/codegen/sync_stream.h>
namespace grpc {
/// A class to represent a flow-controlled unary call. This is something
/// of a hybrid between conventional unary and streaming. This is invoked
/// through a unary call on the client side, but the server responds to it
/// as though it were a single-ping-pong streaming call. The server can use
/// the \a NextMessageSize method to determine an upper-bound on the size of
/// the message.
/// A key difference relative to streaming: ServerUnaryStreamer
/// must have exactly 1 Read and exactly 1 Write, in that order, to function
/// correctly. Otherwise, the RPC is in error.
template <class RequestType, class ResponseType>
class ServerUnaryStreamer GRPC_FINAL
: public ServerReaderWriterInterface<ResponseType, RequestType> {
public:
ServerUnaryStreamer(Call* call, ServerContext* ctx)
: ServerReaderWriterInterface<ResponseType, RequestType>(call, ctx),
read_done_(false),
write_done_(false) {}
~ServerUnaryStreamer() {}
bool Read(RequestType* request) GRPC_OVERRIDE {
if (read_done_) {
return false;
}
read_done_ = true;
return ServerReaderWriterInterface<ResponseType, RequestType>::Read(
request);
}
using WriterInterface<ResponseType>::Write;
bool Write(const ResponseType& response,
const WriteOptions& options) GRPC_OVERRIDE {
if (write_done_ || !read_done_) {
return false;
}
write_done_ = true;
return ServerReaderWriterInterface<ResponseType, RequestType>::Write(
response, options);
}
private:
bool read_done_;
bool write_done_;
};
} // namespace grpc
#endif // GRPCXX_IMPL_CODEGEN_SERVER_STREAMED_UNARY_H
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