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The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)
https://grpc.io/
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95 lines
3.8 KiB
95 lines
3.8 KiB
/* |
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* |
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* Copyright 2015, Google Inc. |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are |
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* met: |
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* |
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* * Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* * Redistributions in binary form must reproduce the above |
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* copyright notice, this list of conditions and the following disclaimer |
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* in the documentation and/or other materials provided with the |
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* distribution. |
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* * Neither the name of Google Inc. nor the names of its |
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* contributors may be used to endorse or promote products derived from |
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* this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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* |
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*/ |
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#ifndef GRPCXX_CHANNEL_H |
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#define GRPCXX_CHANNEL_H |
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#include <memory> |
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#include <grpc++/impl/call.h> |
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#include <grpc++/impl/codegen/channel_interface.h> |
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#include <grpc++/impl/codegen/config.h> |
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#include <grpc++/impl/codegen/grpc_library.h> |
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#include <grpc/grpc.h> |
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struct grpc_channel; |
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namespace grpc { |
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/// Channels represent a connection to an endpoint. Created by \a CreateChannel. |
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class Channel final : public ChannelInterface, |
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public CallHook, |
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public std::enable_shared_from_this<Channel>, |
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private GrpcLibraryCodegen { |
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public: |
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~Channel(); |
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/// Get the current channel state. If the channel is in IDLE and |
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/// \a try_to_connect is set to true, try to connect. |
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grpc_connectivity_state GetState(bool try_to_connect) override; |
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/// Returns the LB policy name, or the empty string if not yet available. |
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grpc::string GetLoadBalancingPolicyName() const; |
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/// Returns the service config in JSON form, or the empty string if |
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/// not available. |
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grpc::string GetServiceConfigJSON() const; |
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private: |
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template <class InputMessage, class OutputMessage> |
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friend Status BlockingUnaryCall(ChannelInterface* channel, |
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const RpcMethod& method, |
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ClientContext* context, |
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const InputMessage& request, |
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OutputMessage* result); |
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friend std::shared_ptr<Channel> CreateChannelInternal( |
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const grpc::string& host, grpc_channel* c_channel); |
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Channel(const grpc::string& host, grpc_channel* c_channel); |
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Call CreateCall(const RpcMethod& method, ClientContext* context, |
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CompletionQueue* cq) override; |
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void PerformOpsOnCall(CallOpSetInterface* ops, Call* call) override; |
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void* RegisterMethod(const char* method) override; |
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void NotifyOnStateChangeImpl(grpc_connectivity_state last_observed, |
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gpr_timespec deadline, CompletionQueue* cq, |
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void* tag) override; |
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bool WaitForStateChangeImpl(grpc_connectivity_state last_observed, |
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gpr_timespec deadline) override; |
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const grpc::string host_; |
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grpc_channel* const c_channel_; // owned |
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}; |
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} // namespace grpc |
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#endif // GRPCXX_CHANNEL_H
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