mirror of https://github.com/grpc/grpc.git
Karthik Ravi Shankar
6 years ago
parent
6be0b06c69
commit
772a74aced
30 changed files with 138 additions and 226 deletions
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/*
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* |
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* Copyright 2015 gRPC authors. |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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* |
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*/ |
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#ifndef GRPCPP_CHANNEL_IMPL_H |
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#define GRPCPP_CHANNEL_IMPL_H |
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#include <memory> |
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#include <mutex> |
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#include <grpc/grpc.h> |
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#include <grpcpp/impl/call.h> |
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#include <grpcpp/impl/codegen/channel_interface.h> |
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#include <grpcpp/impl/codegen/client_interceptor.h> |
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#include <grpcpp/impl/codegen/config.h> |
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#include <grpcpp/impl/codegen/grpc_library.h> |
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#include <grpcpp/impl/codegen/sync.h> |
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struct grpc_channel; |
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namespace grpc { |
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std::shared_ptr<::grpc_impl::Channel> CreateChannelInternal( |
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const grpc::string& host, grpc_channel* c_channel, |
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std::vector< |
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std::unique_ptr<experimental::ClientInterceptorFactoryInterface>> |
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interceptor_creators); |
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} // namespace grpc
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namespace grpc_impl { |
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namespace experimental { |
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/// Resets the channel's connection backoff.
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/// TODO(roth): Once we see whether this proves useful, either create a gRFC
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/// and change this to be a method of the Channel class, or remove it.
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void ChannelResetConnectionBackoff(Channel* channel); |
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} // namespace experimental
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/// Channels represent a connection to an endpoint. Created by \a CreateChannel.
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class Channel final : public ::grpc::ChannelInterface, |
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public ::grpc::internal::CallHook, |
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public std::enable_shared_from_this<Channel>, |
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private ::grpc::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 class ::grpc::internal::BlockingUnaryCallImpl; |
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friend void experimental::ChannelResetConnectionBackoff(Channel* channel); |
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friend std::shared_ptr<Channel> grpc::CreateChannelInternal( |
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const grpc::string& host, grpc_channel* c_channel, |
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std::vector<std::unique_ptr< |
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::grpc::experimental::ClientInterceptorFactoryInterface>> |
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interceptor_creators); |
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friend class ::grpc::internal::InterceptedChannel; |
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Channel(const grpc::string& host, grpc_channel* c_channel, |
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std::vector<std::unique_ptr< |
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::grpc::experimental::ClientInterceptorFactoryInterface>> |
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interceptor_creators); |
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::grpc::internal::Call CreateCall(const ::grpc::internal::RpcMethod& method, |
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::grpc::ClientContext* context, |
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::grpc::CompletionQueue* cq) override; |
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void PerformOpsOnCall(::grpc::internal::CallOpSetInterface* ops, |
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::grpc::internal::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, |
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::grpc::CompletionQueue* cq, 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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::grpc::CompletionQueue* CallbackCQ() override; |
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::grpc::internal::Call CreateCallInternal( |
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const ::grpc::internal::RpcMethod& method, ::grpc::ClientContext* context, |
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::grpc::CompletionQueue* cq, size_t interceptor_pos) override; |
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const grpc::string host_; |
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grpc_channel* const c_channel_; // owned
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// mu_ protects callback_cq_ (the per-channel callbackable completion queue)
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grpc::internal::Mutex mu_; |
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// callback_cq_ references the callbackable completion queue associated
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// with this channel (if any). It is set on the first call to CallbackCQ().
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// It is _not owned_ by the channel; ownership belongs with its internal
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// shutdown callback tag (invoked when the CQ is fully shutdown).
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::grpc::CompletionQueue* callback_cq_ = nullptr; |
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std::vector< |
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std::unique_ptr<::grpc::experimental::ClientInterceptorFactoryInterface>> |
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interceptor_creators_; |
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}; |
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} // namespace grpc_impl
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#endif // GRPCPP_CHANNEL_IMPL_H
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