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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 "src/core/ext/filters/client_channel/subchannel_pool_interface.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. 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.
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:
// The singleton instance. (It's a pointer to RefCountedPtr so that this
// non-local static object can be trivially destructible.)
static RefCountedPtr<GlobalSubchannelPool>* instance_;
// 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 */
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