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/**
* Copyright (C) 2017 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* 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 GNU Affero General 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/logical_session_id.h"
#include "mongo/stdx/functional.h"
#include "mongo/util/periodic_runner.h"
#include "mongo/util/time_support.h"
namespace mongo {
/**
* A service-dependent type for the LogicalSessionCache to use to find the
* current time, schedule periodic refresh jobs, and get a list of sessions
* that are being used for long-running queries on the service context.
*
* Mongod and mongos implement their own classes to fulfill this interface.
*/
class ServiceLiason {
public:
using SessionList = std::list<LogicalSessionId>;
virtual ~ServiceLiason();
/**
* Return a list of sessions that are currently being used to run operations
* on this service.
*/
virtual SessionList getActiveSessions() const = 0;
/**
* Schedule a job to be run at regular intervals until the server shuts down.
*
* The ServiceLiason should start its background runner on construction, and
* should continue fielding job requests through scheduleJob until join() is
* called.
*/
virtual void scheduleJob(PeriodicRunner::PeriodicJob job) = 0;
/**
* Stops the service liason from running any more jobs scheduled
* through scheduleJob. This method may block and wait for background threads to
* join. Implementations should make it safe for this method to be called
* multiple times, or concurrently by different threads.
*/
virtual void join() = 0;
/**
* Return the current time.
*/
virtual Date_t now() const = 0;
};
} // namespace mongo
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