/*
 * Copyright 2012-2015 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.thread.harvester;

import java.util.logging.Level;
import java.util.logging.Logger;

import com.redhat.thermostat.backend.VmUpdate;
import com.redhat.thermostat.backend.VmUpdateException;
import com.redhat.thermostat.backend.VmUpdateListener;
import com.redhat.thermostat.common.Clock;
import com.redhat.thermostat.common.SystemClock;
import com.redhat.thermostat.common.utils.LoggingUtils;
import com.redhat.thermostat.thread.dao.ThreadDao;
import com.redhat.thermostat.thread.model.ThreadSummary;

public class ThreadCountUpdater implements VmUpdateListener {

    private static final Logger logger = LoggingUtils.getLogger(ThreadCountUpdater.class);

    private final Clock clock;
    private final ThreadSummaryHelper summaryHelper;

    public ThreadCountUpdater(ThreadDao threadDao, String writerId, String vmId) {
        this(new SystemClock(), new ThreadSummaryHelper(threadDao, writerId, vmId));
    }

    ThreadCountUpdater(Clock clock, ThreadSummaryHelper summaryHelper) {
        this.clock = clock;
        this.summaryHelper = summaryHelper;
    }

    @Override
    public void countersUpdated(VmUpdate update) {
        long timeStamp = clock.getRealTimeMillis();

        try {
            int liveThreads = (int) (long)
                    update.getPerformanceCounterLong("java.threads.live");
            int daemonThreads = (int) (long)
                    update.getPerformanceCounterLong("java.threads.daemon");

            ThreadSummary summary = summaryHelper.createThreadSummary(timeStamp, liveThreads, daemonThreads);

            summaryHelper.saveSummary(summary);
        } catch (VmUpdateException e) {
            logger.log(Level.WARNING, "Unable to get counter", e);
        }
    }
}
