/*
 * Copyright 2012-2017 Red Hat, Inc.
 *
 * This file is part of Thermostat.
 *
 * Thermostat is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published
 * by the Free Software Foundation; either version 2, or (at your
 * option) any later version.
 *
 * Thermostat 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
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Thermostat; see the file COPYING.  If not see
 * <http://www.gnu.org/licenses/>.
 *
 * Linking this code with other modules is making a combined work
 * based on this code.  Thus, the terms and conditions of the GNU
 * General Public License cover the whole combination.
 *
 * As a special exception, the copyright holders of this code give
 * you permission to link this code with independent modules to
 * produce an executable, regardless of the license terms of these
 * independent modules, and to copy and distribute the resulting
 * executable under terms of your choice, provided that you also
 * meet, for each linked independent module, the terms and conditions
 * of the license of that module.  An independent module is a module
 * which is not derived from or based on this code.  If you modify
 * this code, you may extend this exception to your version of the
 * library, but you are not obligated to do so.  If you do not wish
 * to do so, delete this exception statement from your version.
 */

package com.redhat.thermostat.vm.io.agent.internal;

import com.redhat.thermostat.common.Clock;
import com.redhat.thermostat.common.portability.PortableVmIoStat;
import com.redhat.thermostat.storage.core.WriterID;
import com.redhat.thermostat.vm.io.common.VmIoStat;

public class VmIoStatBuilderImpl implements VmIoStatBuilder {

    private final Clock clock;
    private final String writerId;

    VmIoStatBuilderImpl(Clock clock, WriterID writerId) {
        this.clock = clock;
        this.writerId = writerId.getWriterID();
    }

    public synchronized VmIoStat build(String vmId, Integer pid) {

        PortableVmIoStat data = PortableVmIoStat.build(clock, pid);
        return (data != null) ? new VmIoStat(writerId, vmId, data.getTimeStamp(), data.getCharactersRead(), data.getCharactersWritten(), data.getReadSyscalls(), data.getWriteSyscalls()) : null;
    }

}