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/**
* Copyright (C) 2022-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/operation_context.h"
#include "mongo/db/repl/replica_set_aware_service.h"
#include "mongo/util/concurrency/thread_pool.h"
namespace mongo {
/**
* Service responsible for removing completed internal transactions persisted metadata when they can
* no longer be used. Only enabled on replica set primary nodes.
*/
class InternalTransactionsReapService
: public ReplicaSetAwareService<InternalTransactionsReapService> {
public:
InternalTransactionsReapService();
static InternalTransactionsReapService* get(ServiceContext* serviceContext);
static InternalTransactionsReapService* get(OperationContext* opCtx);
/**
* Adds the eagerly reaped sessions to the reap service to be buffered and later reaped. Does
* not verify they have actually expired, so callers must guarantee they are safe to remove.
*/
static void onEagerlyReapedSessions(ServiceContext* service,
std::vector<LogicalSessionId> lsidsToRemove);
/**
* Buffers the sessions to be reaped when the max batch size has been reached, upon which a task
* is scheduled to reap the transactions.
*/
void addEagerlyReapedSessions(ServiceContext* service,
std::vector<LogicalSessionId> lsidsToRemove);
/**
* Used in tests to wait for a kicked off drain to complete.
*/
void waitForCurrentDrain_forTest();
/**
* Used in tests to detect when the drain task is running.
*/
bool hasCurrentDrain_forTest();
private:
/**
* Will remove all currently buffered sessions ids from config.transactions and
* config.image_collection.
*/
void _reapInternalTransactions(ServiceContext* service);
void onStartup(OperationContext* opCtx) override final;
void onShutdown() override final;
void onStepUpComplete(OperationContext* opCtx, long long term) override final {
stdx::lock_guard lg(_mutex);
_enabled = true;
}
void onStepDown() override final {
stdx::lock_guard lg(_mutex);
_enabled = false;
_lsidsToEagerlyReap.clear();
}
void onInitialDataAvailable(OperationContext* opCtx,
bool isMajorityDataAvailable) override final {}
void onStepUpBegin(OperationContext* opCtx, long long term) override final {}
void onBecomeArbiter() override final {}
std::shared_ptr<ThreadPool> _threadPool;
// Protects the state below.
mutable Mutex _mutex = MONGO_MAKE_LATCH(HierarchicalAcquisitionLevel(1),
"InternalTransactionsReapService::_mutex");
bool _enabled{false};
boost::optional<ExecutorFuture<void>> _drainedSessionsFuture;
std::vector<LogicalSessionId> _lsidsToEagerlyReap;
};
} // namespace mongo
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