global_subchannel_pool.h

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/*
 *
 * 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 <map>
 
#include "absl/base/thread_annotations.h"
 
#include "src/core/ext/filters/client_channel/subchannel_pool_interface.h"
#include "src/core/lib/gprpp/ref_counted_ptr.h"
#include "src/core/lib/gprpp/sync.h"
 
namespace grpc_core {
 
// The global subchannel pool. It shares subchannels among channels. There
// should be only one instance of this class.
class GlobalSubchannelPool final : public SubchannelPoolInterface {
 public:
  // Gets the singleton instance.
  static RefCountedPtr<GlobalSubchannelPool> instance();
 
  // Implements interface methods.
  RefCountedPtr<Subchannel> RegisterSubchannel(
      const SubchannelKey& key, RefCountedPtr<Subchannel> constructed) override
      ABSL_LOCKS_EXCLUDED(mu_);
  void UnregisterSubchannel(const SubchannelKey& key,
                            Subchannel* subchannel) override
      ABSL_LOCKS_EXCLUDED(mu_);
  RefCountedPtr<Subchannel> FindSubchannel(const SubchannelKey& key) override
      ABSL_LOCKS_EXCLUDED(mu_);
 
 private:
  GlobalSubchannelPool() {}
  ~GlobalSubchannelPool() override {}
 
  // A map from subchannel key to subchannel.
  std::map<SubchannelKey, Subchannel*> subchannel_map_ ABSL_GUARDED_BY(mu_);
  // To protect subchannel_map_.
  Mutex mu_;
};
 
}  // namespace grpc_core
 
#endif /* GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_GLOBAL_SUBCHANNEL_POOL_H */