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/*
*
* Copyright 2015-2016, 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_CHANNEL_H
#define GRPCXX_CHANNEL_H
#include <memory>
#include <grpc/grpc.h>
#include <grpc++/impl/call.h>
#include <grpc++/impl/grpc_library.h>
#include <grpc++/support/config.h>
struct grpc_channel;
namespace grpc {
class CallOpSetInterface;
class ChannelArguments;
class CompletionQueue;
class ChannelCredentials;
class SecureChannelCredentials;
template <class R>
class ClientReader;
template <class W>
class ClientWriter;
template <class W, class R>
class ClientReaderWriter;
template <class R>
class ClientAsyncReader;
template <class W>
class ClientAsyncWriter;
template <class W, class R>
class ClientAsyncReaderWriter;
template <class R>
class ClientAsyncResponseReader;
/// Channels represent a connection to an endpoint. Created by \a CreateChannel.
class Channel GRPC_FINAL : public GrpcLibrary,
public CallHook,
public std::enable_shared_from_this<Channel> {
public:
~Channel();
/// Get the current channel state. If the channel is in IDLE and
/// \a try_to_connect is set to true, try to connect.
grpc_connectivity_state GetState(bool try_to_connect);
/// Return the \a tag on \a cq when the channel state is changed or \a
/// deadline expires. \a GetState needs to called to get the current state.
template <typename T>
void NotifyOnStateChange(grpc_connectivity_state last_observed, T deadline,
CompletionQueue* cq, void* tag) {
TimePoint<T> deadline_tp(deadline);
NotifyOnStateChangeImpl(last_observed, deadline_tp.raw_time(), cq, tag);
}
/// Blocking wait for channel state change or \a deadline expiration.
/// \a GetState needs to called to get the current state.
template <typename T>
bool WaitForStateChange(grpc_connectivity_state last_observed, T deadline) {
TimePoint<T> deadline_tp(deadline);
return WaitForStateChangeImpl(last_observed, deadline_tp.raw_time());
}
private:
template <class R>
friend class ::grpc::ClientReader;
template <class W>
friend class ::grpc::ClientWriter;
template <class W, class R>
friend class ::grpc::ClientReaderWriter;
template <class R>
friend class ::grpc::ClientAsyncReader;
template <class W>
friend class ::grpc::ClientAsyncWriter;
template <class W, class R>
friend class ::grpc::ClientAsyncReaderWriter;
template <class R>
friend class ::grpc::ClientAsyncResponseReader;
template <class InputMessage, class OutputMessage>
friend Status BlockingUnaryCall(Channel* channel, const RpcMethod& method,
ClientContext* context,
const InputMessage& request,
OutputMessage* result);
friend class ::grpc::RpcMethod;
friend std::shared_ptr<Channel> CreateChannelInternal(
const grpc::string& host, grpc_channel* c_channel);
Channel(const grpc::string& host, grpc_channel* c_channel);
Call CreateCall(const RpcMethod& method, ClientContext* context,
CompletionQueue* cq);
void PerformOpsOnCall(CallOpSetInterface* ops, Call* call);
void* RegisterMethod(const char* method);
void NotifyOnStateChangeImpl(grpc_connectivity_state last_observed,
gpr_timespec deadline, CompletionQueue* cq,
void* tag);
bool WaitForStateChangeImpl(grpc_connectivity_state last_observed,
gpr_timespec deadline);
const grpc::string host_;
grpc_channel* const c_channel_; // owned
};
} // namespace grpc
#endif // GRPCXX_CHANNEL_H
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