// counters.h
/*
 *    Copyright (C) 2010 10gen 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/platform/basic.h"
#include "mongo/db/jsobj.h"
#include "mongo/platform/atomic_word.h"
#include "mongo/util/net/message.h"
#include "mongo/util/processinfo.h"
#include "mongo/util/concurrency/spin_lock.h"

namespace mongo {

    /**
     * for storing operation counters
     * note: not thread safe.  ok with that for speed
     */
    class OpCounters {
    public:

        OpCounters();
        void incInsertInWriteLock(int n);
        void gotInsert();
        void gotQuery();
        void gotUpdate();
        void gotDelete();
        void gotGetMore();
        void gotCommand();

        void gotOp( int op , bool isCommand );

        BSONObj getObj() const;
        
        // thse are used by snmp, and other things, do not remove
        const AtomicUInt32 * getInsert() const { return &_insert; }
        const AtomicUInt32 * getQuery() const { return &_query; }
        const AtomicUInt32 * getUpdate() const { return &_update; }
        const AtomicUInt32 * getDelete() const { return &_delete; }
        const AtomicUInt32 * getGetMore() const { return &_getmore; }
        const AtomicUInt32 * getCommand() const { return &_command; }

    private:
        void _checkWrap();
        
        // todo: there will be a lot of cache line contention on these.  need to do something 
        //       else eventually.
        AtomicUInt32 _insert;
        AtomicUInt32 _query;
        AtomicUInt32 _update;
        AtomicUInt32 _delete;
        AtomicUInt32 _getmore;
        AtomicUInt32 _command;
    };

    extern OpCounters globalOpCounters;
    extern OpCounters replOpCounters;

    class NetworkCounter {
    public:
        NetworkCounter() : _bytesIn(0), _bytesOut(0), _requests(0), _overflows(0) {}
        void hit( long long bytesIn , long long bytesOut );
        void append( BSONObjBuilder& b );
    private:
        long long _bytesIn;
        long long _bytesOut;
        long long _requests;

        long long _overflows;

        SpinLock _lock;
    };

    extern NetworkCounter networkCounter;
}