| /* |
| * |
| * Copyright 2018 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 GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_GLOBAL_SUBCHANNEL_POOL_H |
| #define GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_GLOBAL_SUBCHANNEL_POOL_H |
| |
| #include <grpc/support/port_platform.h> |
| |
| #include "src/core/ext/filters/client_channel/subchannel_pool_interface.h" |
| |
| namespace grpc_core { |
| |
| // The global subchannel pool. It shares subchannels among channels. There |
| // should be only one instance of this class. Init() should be called once at |
| // the filter initialization time; Shutdown() should be called once at the |
| // filter shutdown time. |
| // TODO(juanlishen): Enable subchannel retention. |
| class GlobalSubchannelPool final : public SubchannelPoolInterface { |
| public: |
| // The ctor and dtor are not intended to use directly. |
| GlobalSubchannelPool(); |
| ~GlobalSubchannelPool() override; |
| |
| // Should be called exactly once at filter initialization time. |
| static void Init(); |
| // Should be called exactly once at filter shutdown time. |
| static void Shutdown(); |
| |
| // Gets the singleton instance. |
| static RefCountedPtr<GlobalSubchannelPool> instance(); |
| |
| // Implements interface methods. |
| Subchannel* RegisterSubchannel(SubchannelKey* key, |
| Subchannel* constructed) override; |
| void UnregisterSubchannel(SubchannelKey* key) override; |
| Subchannel* FindSubchannel(SubchannelKey* key) override; |
| |
| private: |
| // The singleton instance. (It's a pointer to RefCountedPtr so that this |
| // non-local static object can be trivially destructible.) |
| static RefCountedPtr<GlobalSubchannelPool>* instance_; |
| |
| // The vtable for subchannel operations in an AVL tree. |
| static const grpc_avl_vtable subchannel_avl_vtable_; |
| // A map from subchannel key to subchannel. |
| grpc_avl subchannel_map_; |
| // To protect subchannel_map_. |
| gpr_mu mu_; |
| }; |
| |
| } // namespace grpc_core |
| |
| #endif /* GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_GLOBAL_SUBCHANNEL_POOL_H */ |