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/*
*
* Copyright 2017 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_LIB_CHANNEL_CHANNELZ_REGISTRY_H
#define GRPC_CORE_LIB_CHANNEL_CHANNELZ_REGISTRY_H
#include <grpc/impl/codegen/port_platform.h>
#include "src/core/lib/avl/avl.h"
#include "src/core/lib/channel/channel_trace.h"
#include <stdint.h>
namespace grpc_core {
// singleton registry object to track all objects that are needed to support
// channelz bookkeeping. All objects share globally distributed uuids.
class ChannelzRegistry {
public:
// To be called in grpc_init()
static void Init();
// To be callen in grpc_shutdown();
static void Shutdown();
// globally registers a channelz Object. Returns its unique uuid
template <typename Object>
static intptr_t Register(Object* object) {
return Default()->InternalRegister(object);
}
// globally unregisters the object that is associated to uuid.
static void Unregister(intptr_t uuid) { Default()->InternalUnregister(uuid); }
// if object with uuid has previously been registered, returns the
// Object associated with that uuid. Else returns nullptr.
template <typename Object>
static Object* Get(intptr_t uuid) {
return Default()->InternalGet<Object>(uuid);
}
private:
GPRC_ALLOW_CLASS_TO_USE_NON_PUBLIC_NEW
GPRC_ALLOW_CLASS_TO_USE_NON_PUBLIC_DELETE
ChannelzRegistry();
~ChannelzRegistry();
// Returned the singleton instance of ChannelzRegistry;
static ChannelzRegistry* Default();
// globally registers a channelz Object. Returns its unique uuid
template <typename Object>
intptr_t InternalRegister(Object* object) {
intptr_t prior = gpr_atm_no_barrier_fetch_add(&uuid_, 1);
gpr_mu_lock(&mu_);
avl_ = grpc_avl_add(avl_, (void*)prior, object, nullptr);
gpr_mu_unlock(&mu_);
return prior;
}
// globally unregisters the object that is associated to uuid.
void InternalUnregister(intptr_t uuid);
// if object with uuid has previously been registered, returns the
// Object associated with that uuid. Else returns nullptr.
template <typename Object>
Object* InternalGet(intptr_t uuid) {
gpr_mu_lock(&mu_);
Object* ret =
static_cast<Object*>(grpc_avl_get(avl_, (void*)uuid, nullptr));
gpr_mu_unlock(&mu_);
return ret;
}
// private members
gpr_mu mu_;
grpc_avl avl_;
gpr_atm uuid_;
};
} // namespace grpc_core
#endif /* GRPC_CORE_LIB_CHANNEL_CHANNELZ_REGISTRY_H */
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