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 * obtain a copy of the License at
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// Portions Copyright [2019] Payara Foundation and/or affiliates

package com.sun.ejb.base.stats;

import com.sun.ejb.spi.stats.MonitorableSFSBStoreManager;
import com.sun.enterprise.admin.monitor.stats.*;
import org.glassfish.j2ee.statistics.CountStatistic;
import org.glassfish.j2ee.statistics.RangeStatistic;

/**
 * Implementation of StatefulSessionStoreStats
 *  There is once instance of this class per StatefulEJBContainer
 *
 * @author Mahesh Kannan
 */

public class StatefulSessionStoreStatsImpl
    extends StatsImpl
    implements com.sun.enterprise.admin.monitor.stats.StatefulSessionStoreStats
{

    private MonitorableSFSBStoreManager provider;

    private MutableBoundedRangeStatisticImpl	currentSize;

    private MutableCountStatisticImpl		activationCount;
    private MutableCountStatisticImpl		activationSuccessCount;
    private MutableCountStatisticImpl		activationErrorCount;

    private MutableCountStatisticImpl		passivationCount;
    private MutableCountStatisticImpl		passivationSuccessCount;
    private MutableCountStatisticImpl		passivationErrorCount;

    private MutableCountStatisticImpl		expiredSessionCount;

    private MutableAverageRangeStatisticImpl	activationSize;
    private MutableAverageRangeStatisticImpl	activationTime;

    private MutableAverageRangeStatisticImpl	passivationSize;
    private MutableAverageRangeStatisticImpl	passivationTime;

    private Object currentSizeLock = new Object();

    private Object activationCountLock = new Object();
    private Object activationSizeLock = new Object();
    private Object activationTimeLock = new Object();

    private Object passivationCountLock = new Object();
    private Object passivationSizeLock = new Object();
    private Object passivationTimeLock = new Object();

    private Object expiredSessionCountLock = new Object();

    private long    activationCountVal;
    private long    activationSuccessCountVal;
    private long    activationErrorCountVal;

    private long    passivationCountVal;
    private long    passivationSuccessCountVal;
    private long    passivationErrorCountVal;

    private long    expiredSessionCountVal;

    public StatefulSessionStoreStatsImpl(
	MonitorableSFSBStoreManager provider)
    {
	this.provider = provider;
	initialize();
    }

    protected StatefulSessionStoreStatsImpl(
	MonitorableSFSBStoreManager provider, String intfName)
    {
	this.provider = provider;
    }

    protected void initialize() {

	long now = System.currentTimeMillis();

	synchronized (currentSizeLock) {
	    currentSize = new MutableBoundedRangeStatisticImpl(
	    	new BoundedRangeStatisticImpl(0, 0, Long.MAX_VALUE,
			Long.MAX_VALUE, 0, "CurrentSize",
			"bytes", "Number of sessions in store", now, now)
	    );
	}

	synchronized (activationCountLock) {
	    activationCount = new MutableCountStatisticImpl(
		new CountStatisticImpl("ActivationCount"));
	    activationSuccessCount = new MutableCountStatisticImpl(
		new CountStatisticImpl("ActivationSuccessCount"));
	    activationErrorCount = new MutableCountStatisticImpl(
		new CountStatisticImpl("ActivationErrorCount"));
	}

	synchronized (activationSizeLock) {
	    activationSize = new MutableAverageRangeStatisticImpl(
	    	new BoundedRangeStatisticImpl(0, 0, Long.MAX_VALUE,
			Long.MAX_VALUE, 0, "ActivationSize",
			"bytes", "Number of bytes activated", now, now)
	    );
	}

	synchronized (passivationSizeLock) {
	    passivationSize = new MutableAverageRangeStatisticImpl(
	    	new BoundedRangeStatisticImpl(0, 0, Long.MAX_VALUE,
			Long.MAX_VALUE, 0, "PassivationSize",
			"bytes", "Number of bytes passivated", now, now)
	    );
	}

	synchronized (passivationCountLock) {
	    passivationCount = new MutableCountStatisticImpl(
		new CountStatisticImpl("PassivationCount"));
	    passivationSuccessCount = new MutableCountStatisticImpl(
		new CountStatisticImpl("PassivationSuccessCount"));
	    passivationErrorCount = new MutableCountStatisticImpl(
		new CountStatisticImpl("PassivationErrorCount"));
	}

	synchronized (expiredSessionCountLock) {
	    expiredSessionCount = new MutableCountStatisticImpl(
		new CountStatisticImpl("ExpiredSessionCount"));
	}

	synchronized (activationTimeLock) {
	    activationTime = new MutableAverageRangeStatisticImpl(
	    	new BoundedRangeStatisticImpl(0, 0, Long.MAX_VALUE,
			Long.MAX_VALUE, 0, "ActivationTime",
			"millis", "Time spent on activation", now, now)
	    );
	}

	synchronized (passivationTimeLock) {
	    passivationTime = new MutableAverageRangeStatisticImpl(
	    	new BoundedRangeStatisticImpl(0, 0, Long.MAX_VALUE,
			Long.MAX_VALUE, 0, "PassivationTime",
			"millis", "Time spent on passivation", now, now)
	    );
	}
    }

    /**
     * Returns the number of passivated / checkpointed sessions in the store
     */
    public RangeStatistic getCurrentSize() {
	synchronized (currentSizeLock) {
	    currentSize.setCount(provider.getCurrentStoreSize());
	    return (RangeStatistic) currentSize.unmodifiableView();
	}
    }

    /**
     * Returns the total number of sessions activated from the store
     */
    public CountStatistic getActivationCount() {
	synchronized (activationCountLock) {
	    activationCount.setCount(activationCountVal);
	   return (CountStatistic) activationCount.unmodifiableView();
	}
    }

    /**
     * Returns the total number of sessions successfully Activated from the store
     */
    public CountStatistic getActivationSuccessCount() {
	synchronized (activationCountLock) {
	    activationSuccessCount.setCount(activationSuccessCountVal);
	    return (CountStatistic) activationSuccessCount.unmodifiableView();
	}
    }

    /**
     * Returns the total number of sessions that couldn't be Activated from the store
     */
    public CountStatistic getActivationErrorCount() {
	synchronized (activationCountLock) {
	    activationErrorCount.setCount(activationErrorCountVal);
	    return (CountStatistic) activationErrorCount.unmodifiableView();
	}
    }

    /**
     * Returns the total number of sessions passivated using this store
     */
    public CountStatistic getPassivationCount() {
	synchronized (passivationCountLock) {
	    passivationCount.setCount(passivationCountVal);
	    return (CountStatistic) passivationSuccessCount.unmodifiableView();
	}
    }

    /**
     * Returns the total number of sessions successfully Passivated using the store
     */
    public CountStatistic getPassivationSuccessCount() {
	synchronized (passivationCountLock) {
	    passivationSuccessCount.setCount(passivationSuccessCountVal);
	    return (CountStatistic) passivationSuccessCount.unmodifiableView();
	}
    }

    /**
     * Returns the total number of sessions that couldn't be Passivated using the store
     */
    public CountStatistic getPassivationErrorCount() {
	synchronized (passivationCountLock) {
	    passivationErrorCount.setCount(passivationErrorCountVal);
	    return (CountStatistic) passivationSuccessCount.unmodifiableView();
	}
    }

    /**
     * Returns the total number of expired sessions that were removed by this store
     */
    public CountStatistic getExpiredSessionCount() {
	synchronized (expiredSessionCountLock) {
	    expiredSessionCount.setCount(expiredSessionCountVal);
	    return (CountStatistic) expiredSessionCount.unmodifiableView();

	}
    }

    /**
     * Returns the total number of bytes activated by this store including total, min, maximum
     */
    public AverageRangeStatistic getActivatedBeanSize() {
	synchronized (activationSizeLock) {
	    return (AverageRangeStatistic) activationSize.unmodifiableView();
	}
    }

    /**
     * Returns the time spent on activating beans from the store including total, min, max
     */
    public AverageRangeStatistic getActivationTime() {
	synchronized (activationTimeLock) {
	    return (AverageRangeStatistic) activationTime.unmodifiableView();
	}
    }

    /**
     * Returns the total number of bytes passivated by this store including total, min, maximum
     */
    public AverageRangeStatistic getPassivatedBeanSize() {
	synchronized (passivationSizeLock) {
	    return (AverageRangeStatistic) passivationSize.unmodifiableView();
	}
    }

    /**
     * Returns the time spent on passivating beans to the store including total, min, max
     */
    public AverageRangeStatistic getPassivationTime() {
	synchronized (passivationTimeLock) {
	    return (AverageRangeStatistic) passivationTime.unmodifiableView();
	}
    }

    //The following methods are called from StatefulSessionStoreMonitor
    //
    void incrementActivationCount(boolean success) {
	synchronized (activationCountLock) {
	    activationCountVal++;
	    if (success) {
		activationSuccessCountVal++;
	    } else {
		activationErrorCountVal++;
	    }
	}
    }

    void incrementPassivationCount(boolean success) {
	synchronized (passivationCountLock) {
	    passivationCountVal++;
	    if (success) {
		passivationSuccessCountVal++;
	    } else {
		passivationErrorCountVal++;
	    }
	}
    }

    void setActivationSize(long val) {
	synchronized (activationSizeLock) {
	    activationSize.setCount(val);
	}
    }

    void setActivationTime(long val) {
	synchronized (activationTimeLock) {
	    activationTime.setCount(val);
	}
    }

    void setPassivationSize(long val) {
	synchronized (passivationSizeLock) {
	    passivationSize.setCount(val);
	}
    }

    void setPassivationTime(long val) {
	synchronized (passivationTimeLock) {
	    passivationTime.setCount(val);
	}
    }

    void incrementExpiredSessionCountVal(long val) {
	synchronized (expiredSessionCountLock) {
	    expiredSessionCountVal += val;
	}
    }

    protected void appendStats(StringBuilder sbuf) {
	sbuf.append("currentSize=").append(provider.getCurrentStoreSize())
	    .append("; ")
	    .append("ActivationCount=").append(activationCountVal)
	    .append("; ")
	    .append("ActivationSuccessCount=").append(activationSuccessCountVal)
	    .append("; ")
	    .append("ActivationErrorCount=").append(activationErrorCountVal)
	    .append("; ")
	    .append("PassivationCount=").append(passivationCountVal)
	    .append("; ")
	    .append("PassivationSuccessCount=").append(passivationSuccessCountVal)
	    .append("; ")
	    .append("PassivationErrorCount=").append(passivationErrorCountVal)
	    .append("; ")
	    .append("ExpiredSessionsRemoved=").append(expiredSessionCountVal)
	    .append("; ");

	appendTimeStatistic(sbuf, "ActivationSize", activationSize);
	appendTimeStatistic(sbuf, "ActivationTime", activationTime);
	appendTimeStatistic(sbuf, "PassivationSize", passivationSize);
	appendTimeStatistic(sbuf, "PassivationTime", passivationTime);

    }

    protected static void appendTimeStatistic(StringBuilder sbuf, String name,
	    MutableAverageRangeStatisticImpl stat)
    {
	sbuf.append(name).append("(")
	    .append("min=").append(stat.getLowWaterMark()).append(", ")
	    .append("max=").append(stat.getHighWaterMark()).append(", ")
	    .append("avg=").append(stat.getAverage())
	    .append("); ");
    }


    //Some of the store attributes are (unfortunately) exposed through
    //	the LruSessionCache too
    //Called from LruSessionCache -> StatefulSessionStoreMonitor
    int getNumExpiredSessionCount() {
	synchronized (expiredSessionCountLock) {
	    return (int) expiredSessionCountVal;
	}
    }

    int getNumPassivationCount() {
	synchronized (passivationCountLock) {
	    return (int) passivationCountVal;
	}
    }

    int getNumPassivationSuccessCount() {
	synchronized (passivationCountLock) {
	    return (int) passivationSuccessCountVal;
	}
    }

    int getNumPassivationErrorCount() {
	synchronized (passivationCountLock) {
	    return (int) passivationErrorCountVal;
	}
    }


}