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/*
*
* Copyright 2014, 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 __GRPCPP_INTERNAL_STREAM_STREAM_CONTEXT_H__
#define __GRPCPP_INTERNAL_STREAM_STREAM_CONTEXT_H__
#include <grpc/grpc.h>
#include <grpc++/status.h>
#include <grpc++/stream_context_interface.h>
namespace google {
namespace protobuf {
class Message;
}
}
namespace grpc {
class ClientContext;
class RpcMethod;
class StreamContext : public StreamContextInterface {
public:
StreamContext(const RpcMethod& method, ClientContext* context,
const google::protobuf::Message* request, google::protobuf::Message* result);
StreamContext(const RpcMethod& method, grpc_call* call,
grpc_completion_queue* cq, google::protobuf::Message* request,
google::protobuf::Message* result);
~StreamContext();
// Start the stream, if there is a final write following immediately, set
// buffered so that the messages can be sent in batch.
void Start(bool buffered) override;
bool Read(google::protobuf::Message* msg) override;
bool Write(const google::protobuf::Message* msg, bool is_last) override;
const Status& Wait() override;
void FinishStream(const Status& status, bool send) override;
google::protobuf::Message* request() override { return request_; }
google::protobuf::Message* response() override { return result_; }
private:
// Unique tags for plucking events from the c layer. this pointer is casted
// to char* to create single byte step between tags. It implicitly relies on
// that StreamContext is large enough to contain all the pointers.
void* finished_tag() { return reinterpret_cast<char*>(this); }
void* read_tag() { return reinterpret_cast<char*>(this) + 1; }
void* write_tag() { return reinterpret_cast<char*>(this) + 2; }
void* halfclose_tag() { return reinterpret_cast<char*>(this) + 3; }
void* invoke_tag() { return reinterpret_cast<char*>(this) + 4; }
void* client_metadata_read_tag() { return reinterpret_cast<char*>(this) + 5; }
grpc_call* call() { return call_; }
grpc_completion_queue* cq() { return cq_; }
bool is_client_;
const RpcMethod* method_; // not owned
grpc_call* call_; // not owned
grpc_completion_queue* cq_; // not owned
google::protobuf::Message* request_; // first request, not owned
google::protobuf::Message* result_; // last response, not owned
bool peer_halfclosed_;
bool self_halfclosed_;
Status final_status_;
};
} // namespace grpc
#endif // __GRPCPP_INTERNAL_STREAM_STREAM_CONTEXT_H__
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