/**
 *    Copyright (C) 2016 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 <vector>

#include "mongo/base/disallow_copying.h"
#include "mongo/platform/atomic_word.h"
#include "mongo/transport/service_entry_point.h"

namespace mongo {

namespace transport {
class Session;
class TransportLayer;
}  // namespace transport

/**
 * The entry point from the TransportLayer into Mongod. startSession() spawns and
 * detaches a new thread for each incoming connection (transport::Session).
 */
class ServiceEntryPointMongod final : public ServiceEntryPoint {
    MONGO_DISALLOW_COPYING(ServiceEntryPointMongod);

public:
    explicit ServiceEntryPointMongod(transport::TransportLayer* tl);

    virtual ~ServiceEntryPointMongod() = default;

    void startSession(transport::SessionHandle session) override;

    std::size_t getNumberOfActiveWorkerThreads() const {
        return _nWorkers.load();
    }

private:
    void _sessionLoop(const transport::SessionHandle& session);

    transport::TransportLayer* _tl;
    AtomicWord<std::size_t> _nWorkers;
};

}  // namespace mongo