// counters.cpp
/*
 *    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.
 */

#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kDefault

#define MONGO_PCH_WHITELISTED
#include "mongo/platform/basic.h"
#include "mongo/pch.h"
#undef MONGO_PCH_WHITELISTED

#include "mongo/db/stats/counters.h"

#include "mongo/db/jsobj.h"
#include "mongo/util/log.h"

namespace mongo {
    OpCounters::OpCounters() {}

    void OpCounters::incInsertInWriteLock(int n) {
        RARELY _checkWrap();
        _insert.fetchAndAdd(n);
    }

    void OpCounters::gotInsert() {
        RARELY _checkWrap();
        _insert.fetchAndAdd(1);
    }

    void OpCounters::gotQuery() {
        RARELY _checkWrap();
        _query.fetchAndAdd(1);
    }

    void OpCounters::gotUpdate() {
        RARELY _checkWrap();
        _update.fetchAndAdd(1);
    }

    void OpCounters::gotDelete() {
        RARELY _checkWrap();
        _delete.fetchAndAdd(1);
    }

    void OpCounters::gotGetMore() {
        RARELY _checkWrap();
        _getmore.fetchAndAdd(1);
    }

    void OpCounters::gotCommand() {
        RARELY _checkWrap();
        _command.fetchAndAdd(1);
    }

    void OpCounters::gotOp( int op , bool isCommand ) {
        switch ( op ) {
        case dbInsert: /*gotInsert();*/ break; // need to handle multi-insert
        case dbQuery:
            if ( isCommand )
                gotCommand();
            else
                gotQuery();
            break;

        case dbUpdate: gotUpdate(); break;
        case dbDelete: gotDelete(); break;
        case dbGetMore: gotGetMore(); break;
        case dbKillCursors:
        case opReply:
        case dbMsg:
            break;
        default: log() << "OpCounters::gotOp unknown op: " << op << endl;
        }
    }

    void OpCounters::_checkWrap() {
        const unsigned MAX = 1 << 30;
        
        bool wrap =
            _insert.loadRelaxed() > MAX ||
            _query.loadRelaxed() > MAX ||
            _update.loadRelaxed() > MAX ||
            _delete.loadRelaxed() > MAX ||
            _getmore.loadRelaxed() > MAX ||
            _command.loadRelaxed() > MAX;
        
        if ( wrap ) {
            _insert.store(0);
            _query.store(0);
            _update.store(0);
            _delete.store(0);
            _getmore.store(0);
            _command.store(0);
        }
    }

    BSONObj OpCounters::getObj() const {
        BSONObjBuilder b;
        b.append( "insert" , _insert.loadRelaxed() );
        b.append( "query" , _query.loadRelaxed() );
        b.append( "update" , _update.loadRelaxed() );
        b.append( "delete" , _delete.loadRelaxed() );
        b.append( "getmore" , _getmore.loadRelaxed() );
        b.append( "command" , _command.loadRelaxed() );
        return b.obj();
    }

    void NetworkCounter::hit( long long bytesIn , long long bytesOut ) {
        const long long MAX = 1ULL << 60;

        // don't care about the race as its just a counter
        bool overflow = _bytesIn > MAX || _bytesOut > MAX;

        if ( overflow ) {
            _lock.lock();
            _overflows++;
            _bytesIn = bytesIn;
            _bytesOut = bytesOut;
            _requests = 1;
            _lock.unlock();
        }
        else {
            _lock.lock();
            _bytesIn += bytesIn;
            _bytesOut += bytesOut;
            _requests++;
            _lock.unlock();
        }
    }

    void NetworkCounter::append( BSONObjBuilder& b ) {
        _lock.lock();
        b.appendNumber( "bytesIn" , _bytesIn );
        b.appendNumber( "bytesOut" , _bytesOut );
        b.appendNumber( "numRequests" , _requests );
        _lock.unlock();
    }


    OpCounters globalOpCounters;
    OpCounters replOpCounters;
    NetworkCounter networkCounter;

}