| 1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889909192939495969798 | /* * * Copyright 2015 gRPC authors. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * *     http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * */#ifndef GRPCPP_CHANNEL_H#define GRPCPP_CHANNEL_H#include <memory>#include <grpc/grpc.h>#include <grpcpp/impl/call.h>#include <grpcpp/impl/codegen/channel_interface.h>#include <grpcpp/impl/codegen/config.h>#include <grpcpp/impl/codegen/grpc_library.h>struct grpc_channel;namespace grpc {namespace experimental {/// Resets the channel's connection backoff./// TODO(roth): Once we see whether this proves useful, either create a gRFC/// and change this to be a method of the Channel class, or remove it.void ChannelResetConnectionBackoff(Channel* channel);}  // namespace experimental/// Channels represent a connection to an endpoint. Created by \a CreateChannel.class Channel final : public ChannelInterface,                      public internal::CallHook,                      public std::enable_shared_from_this<Channel>,                      private GrpcLibraryCodegen { 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) override;  /// Returns the LB policy name, or the empty string if not yet available.  grpc::string GetLoadBalancingPolicyName() const;  /// Returns the service config in JSON form, or the empty string if  /// not available.  grpc::string GetServiceConfigJSON() const; private:  template <class InputMessage, class OutputMessage>  friend class internal::BlockingUnaryCallImpl;  friend void experimental::ChannelResetConnectionBackoff(Channel* channel);  friend std::shared_ptr<Channel> CreateChannelInternal(      const grpc::string& host, grpc_channel* c_channel);  Channel(const grpc::string& host, grpc_channel* c_channel);  internal::Call CreateCall(const internal::RpcMethod& method,                            ClientContext* context,                            CompletionQueue* cq) override;  void PerformOpsOnCall(internal::CallOpSetInterface* ops,                        internal::Call* call) override;  void* RegisterMethod(const char* method) override;  void NotifyOnStateChangeImpl(grpc_connectivity_state last_observed,                               gpr_timespec deadline, CompletionQueue* cq,                               void* tag) override;  bool WaitForStateChangeImpl(grpc_connectivity_state last_observed,                              gpr_timespec deadline) override;  CompletionQueue* CallbackCQ() override;  const grpc::string host_;  grpc_channel* const c_channel_;  // owned  // mu_ protects callback_cq_ (the per-channel callbackable completion queue)  std::mutex mu_;  // callback_cq_ references the callbackable completion queue associated  // with this channel (if any). It is set on the first call to CallbackCQ().  // It is _not owned_ by the channel; ownership belongs with its internal  // shutdown callback tag (invoked when the CQ is fully shutdown).  CompletionQueue* callback_cq_ = nullptr;};}  // namespace grpc#endif  // GRPCPP_CHANNEL_H
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