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/**
* Copyright (C) 2019-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#pragma once
#include "mongo/db/client.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/service_context.h"
#include "mongo/platform/mutex.h"
#include "mongo/stdx/unordered_map.h"
namespace mongo {
/**
* OperationKeyManager maps OperationKeys to OperationIds
*
* To make this simpler to reason about, this class is a decoration on a ServiceContext with its own
* synchronization. This class is currently expected to be used at 3 points:
* - Before Command execution, the OperationKey from the client application is added.
* - During a killop-like operation, it is used to find the OperationContext to kill.
* - During OperationContext destruction, the OperationKey from the client application is removed.
*/
class OperationKeyManager {
public:
static OperationKeyManager& get(ServiceContext* serviceContext = getCurrentServiceContext());
static OperationKeyManager& get(Client* client) {
return get(client->getServiceContext());
}
static OperationKeyManager& get(OperationContext* opCtx) {
return get(opCtx->getServiceContext());
}
~OperationKeyManager();
/**
* Add a mapping from OperationKey to OperationId
*/
void add(const OperationKey& key, OperationId id);
/**
* Remove any mapping from OperationKey
*/
bool remove(const OperationKey& key);
/**
* Get the OperationId for OperationKey, or boost::none
*/
boost::optional<OperationId> at(const OperationKey& key) const;
/**
* Get the total count of OperationKeys currently being tracked
*/
size_t size() const;
private:
mutable Mutex _mutex = MONGO_MAKE_LATCH("OperationKeyManager::_mutex");
stdx::unordered_map<OperationKey, OperationId, OperationKey::Hash> _idByOperationKey;
};
} // namespace mongo
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