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/*
 * TeleStax, Open Source Cloud Communications
 * Copyright 2011-2016, TeleStax Inc. and individual contributors
 * by the @authors tag.
 *
 * This program is free software: you can redistribute it and/or modify
 * under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation; either version 3 of
 * the License, or (at your option) any later version.
 *
 * 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 
 *
 * This file incorporates work covered by the following copyright and
 * permission notice:
 *
 *   JBoss, Home of Professional Open Source
 *   Copyright 2007-2011, Red Hat, Inc. and individual contributors
 *   by the @authors tag. See the copyright.txt in the distribution for a
 *   full listing of individual contributors.
 *
 *   This is free software; you can redistribute it and/or modify it
 *   under the terms of the GNU Lesser General Public License as
 *   published by the Free Software Foundation; either version 2.1 of
 *   the License, or (at your option) any later version.
 *
 *   This software 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
 *   Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public
 *   License along with this software; if not, write to the Free
 *   Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 *   02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.jdiameter.common.impl.concurrent;

import org.jdiameter.common.api.statistic.IStatistic;
import org.jdiameter.common.api.statistic.IStatisticRecord;

/**
 * @author  Alexandre Mendonca 
 * @author  Bartosz Baranowski 
 */
abstract class AbstractTask {

    protected L parentTask;
    protected long createdTime = System.nanoTime();

    protected IStatistic statistic;

    protected IStatisticRecord execTimeSumm;
    protected IStatisticRecord execTimeCount;

    protected IStatisticRecord waitTimeSumm;
    protected IStatisticRecord waitTimeCount;

    AbstractTask(L task, final IStatistic statistic, IStatisticRecord... statisticRecords) {
        this.parentTask = task;
        execTimeSumm = statisticRecords[0];
        execTimeCount = statisticRecords[1];
        waitTimeSumm = statisticRecords[2];
        waitTimeCount = statisticRecords[3];
        this.statistic = statistic;
    }

    protected IStatisticRecord getCounter(IStatisticRecord.Counters counter) {
        return statistic.getRecordByName(counter.name());
    }

    protected void updateTimeStatistic(long time, long waitTime) {
        if (statistic.isEnabled()) {
            execTimeSumm.inc((System.nanoTime() - time) / 999999);
            execTimeCount.inc();
            waitTimeSumm.inc(waitTime / 999999);
            waitTimeCount.inc();
        }
    }

    @Override
    @SuppressWarnings("EqualsWhichDoesntCheckParameterClass")
    public boolean equals(Object o) {
        return this == o || parentTask.equals(o);
    }

    @Override
    public int hashCode() {
        return parentTask.hashCode();
    }

    public static class AverageValueHolder implements IStatisticRecord.ValueHolder {
        private IStatistic statistic;
        private IStatisticRecord.Counters counter;

        AverageValueHolder(IStatistic statistic, IStatisticRecord.Counters counter) {
            this.statistic = statistic;
            this.counter = counter;
        }

        public double getValueAsDouble() {

            IStatisticRecord record = statistic.getRecordByName(counter.name());
            if (statistic.isEnabled() && (record.getChilds().length == 2 || record.getChilds()[1].getValueAsLong() != 0)) {
                long count = record.getChilds()[1].getValueAsLong();
                return ((float) record.getChilds()[0].getValueAsLong()) / ((float) (count != 0 ? count : 1));
            } else {
                return 0;
            }
        }

        @Override
        public String getValueAsString() {
            return String.valueOf(getValueAsDouble());
        }
    }
}