1 // 2 // 3 // Copyright 2018 gRPC authors. 4 // 5 // Licensed under the Apache License, Version 2.0 (the "License"); 6 // you may not use this file except in compliance with the License. 7 // You may obtain a copy of the License at 8 // 9 // http://www.apache.org/licenses/LICENSE-2.0 10 // 11 // Unless required by applicable law or agreed to in writing, software 12 // distributed under the License is distributed on an "AS IS" BASIS, 13 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 // See the License for the specific language governing permissions and 15 // limitations under the License. 16 // 17 // 18 19 #ifndef GRPC_SRC_CORE_CLIENT_CHANNEL_LOCAL_SUBCHANNEL_POOL_H 20 #define GRPC_SRC_CORE_CLIENT_CHANNEL_LOCAL_SUBCHANNEL_POOL_H 21 22 #include <grpc/support/port_platform.h> 23 24 #include <map> 25 26 #include "src/core/client_channel/subchannel_pool_interface.h" 27 #include "src/core/util/ref_counted_ptr.h" 28 29 namespace grpc_core { 30 31 // The local subchannel pool that is owned by a single channel. It doesn't 32 // support subchannel sharing with other channels by nature. Nor does it support 33 // subchannel retention when a subchannel is not used. The only real purpose of 34 // using this subchannel pool is to allow subchannel reuse within the channel 35 // when an incoming resolver update contains some addresses for which the 36 // channel has already created subchannels. 37 // Thread-unsafe. 38 class LocalSubchannelPool final : public SubchannelPoolInterface { 39 public: LocalSubchannelPool()40 LocalSubchannelPool() {} ~LocalSubchannelPool()41 ~LocalSubchannelPool() override {} 42 43 // Implements interface methods. 44 // Thread-unsafe. Intended to be invoked within the client_channel work 45 // serializer. 46 RefCountedPtr<Subchannel> RegisterSubchannel( 47 const SubchannelKey& key, RefCountedPtr<Subchannel> constructed) override; 48 void UnregisterSubchannel(const SubchannelKey& key, 49 Subchannel* subchannel) override; 50 RefCountedPtr<Subchannel> FindSubchannel(const SubchannelKey& key) override; 51 52 private: 53 // A map from subchannel key to subchannel. 54 std::map<SubchannelKey, Subchannel*> subchannel_map_; 55 }; 56 57 } // namespace grpc_core 58 59 #endif // GRPC_SRC_CORE_CLIENT_CHANNEL_LOCAL_SUBCHANNEL_POOL_H 60