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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.
//
//
#include <grpc/support/port_platform.h>
#include "src/core/ext/filters/client_channel/global_subchannel_pool.h"
#include "src/core/ext/filters/client_channel/subchannel.h"
namespace grpc_core {
#define GRPC_REGISTER_SUBCHANNEL_CALM_DOWN_AFTER_ATTEMPTS 100
#define GRPC_REGISTER_SUBCHANNEL_CALM_DOWN_MICROS 10
void GlobalSubchannelPool::Init() {
instance_ = new RefCountedPtr<GlobalSubchannelPool>(
MakeRefCounted<GlobalSubchannelPool>());
}
void GlobalSubchannelPool::Shutdown() {
// To ensure Init() was called before.
GPR_ASSERT(instance_ != nullptr);
// To ensure Shutdown() was not called before.
GPR_ASSERT(*instance_ != nullptr);
instance_->reset();
delete instance_;
}
RefCountedPtr<GlobalSubchannelPool> GlobalSubchannelPool::instance() {
GPR_ASSERT(instance_ != nullptr);
GPR_ASSERT(*instance_ != nullptr);
return *instance_;
}
RefCountedPtr<Subchannel> GlobalSubchannelPool::RegisterSubchannel(
const SubchannelKey& key, RefCountedPtr<Subchannel> constructed) {
MutexLock lock(&mu_);
auto it = subchannel_map_.find(key);
if (it != subchannel_map_.end()) {
RefCountedPtr<Subchannel> existing = it->second->RefIfNonZero();
if (existing != nullptr) return existing;
}
subchannel_map_[key] = constructed.get();
return constructed;
}
RefCountedPtr<GlobalSubchannelPool>* GlobalSubchannelPool::instance_ = nullptr;
void GlobalSubchannelPool::UnregisterSubchannel(const SubchannelKey& key,
Subchannel* subchannel) {
MutexLock lock(&mu_);
auto it = subchannel_map_.find(key);
// delete only if key hasn't been re-registered to a different subchannel
// between strong-unreffing and unregistration of subchannel.
if (it != subchannel_map_.end() && it->second == subchannel) {
subchannel_map_.erase(it);
}
}
RefCountedPtr<Subchannel> GlobalSubchannelPool::FindSubchannel(
const SubchannelKey& key) {
MutexLock lock(&mu_);
auto it = subchannel_map_.find(key);
if (it == subchannel_map_.end()) return nullptr;
return it->second->RefIfNonZero();
}
} // namespace grpc_core
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