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//Portions Copyright [2016-2017] [Payara Foundation]

package org.glassfish.jdbc.pool.monitor;

import org.glassfish.external.probe.provider.annotations.ProbeListener;
import org.glassfish.external.probe.provider.annotations.ProbeParam;
import org.glassfish.external.statistics.CountStatistic;
import org.glassfish.external.statistics.RangeStatistic;
import org.glassfish.external.statistics.impl.CountStatisticImpl;
import org.glassfish.external.statistics.impl.RangeStatisticImpl;
import org.glassfish.external.statistics.impl.StatisticImpl;
import org.glassfish.gmbal.AMXMetadata;
import org.glassfish.gmbal.Description;
import org.glassfish.gmbal.ManagedAttribute;
import org.glassfish.gmbal.ManagedObject;
import org.glassfish.resourcebase.resources.api.PoolInfo;

/**
 * StatsProvider object for Jdbc pool monitoring grouped by application names.
 *
 * Implements various events related to jdbc pool monitoring and provides
 * objects to the calling modules that retrieve monitoring information.
 *
 * @author Shalini M
 */
@AMXMetadata(type="jdbc-connection-pool-app-mon", group="monitoring")
@ManagedObject
@Description("JDBC Connection pool Application based Statistics")
public class JdbcConnPoolAppStatsProvider {

    private RangeStatisticImpl numConnUsed = new RangeStatisticImpl(
            0, 0, 0,
            "NumConnUsed", StatisticImpl.UNIT_COUNT, "Provides connection usage " +
            "statistics. The total number of connections that are currently being " +
            "used, as well as information about the maximum number of connections " +
            "that were used (the high water mark).",
            System.currentTimeMillis(), System.currentTimeMillis());
    private CountStatisticImpl numConnAcquired = new CountStatisticImpl(
            "NumConnAcquired", StatisticImpl.UNIT_COUNT, "Number of logical " +
            "connections acquired from the pool.");
    private CountStatisticImpl numConnReleased = new CountStatisticImpl(
            "NumConnReleased", StatisticImpl.UNIT_COUNT, "Number of logical " +
            "connections released to the pool.");
    private static final String JDBC_APP_PROBE_LISTENER = "glassfish:jdbc-pool:applications:";
    private String appName;
    private String poolName;

    public JdbcConnPoolAppStatsProvider(PoolInfo poolInfo, String appName) {
        this.poolName = poolInfo.getName();
        this.appName = appName;
    }

    public String getPoolName() {
        return this.poolName;
    }

    public String getAppName() {
        return this.appName;
    }

    @ProbeListener(JDBC_APP_PROBE_LISTENER + "decrementConnectionUsedEvent")
    public void decrementConnectionUsedEvent(
            @ProbeParam("poolName") String poolName,
            @ProbeParam("appName") String appName) {
        // handle the num conn used decrement event
        if((poolName != null) && (poolName.equals(this.poolName))) {
            if (appName != null && appName.equals(this.appName)) {
                //Decrement numConnUsed counter
                synchronized (numConnUsed) {
                    long numConnUsedSafe = (numConnUsed.getCurrent() >= 0) ? numConnUsed.getCurrent() - 1 : 0;
                    numConnUsed.setCurrent(numConnUsedSafe);
                }
            }
        }
    }

    /**
     * Connection used event
     * @param poolName
     * @param appName
     */
    @ProbeListener(JDBC_APP_PROBE_LISTENER + "connectionUsedEvent")
    public void connectionUsedEvent(
            @ProbeParam("poolName") String poolName,
            @ProbeParam("appName") String appName) {
        // handle the connection used event
        if((poolName != null) && (poolName.equals(this.poolName))) {
            if (appName != null && appName.equals(this.appName)) {
                //increment numConnUsed
                synchronized (numConnUsed) {
                    numConnUsed.setCurrent(numConnUsed.getCurrent() + 1);
                }
            }
        }
    }

    /**
     * When a connection is acquired increment counter
     */
    @ProbeListener(JDBC_APP_PROBE_LISTENER + "connectionAcquiredEvent")
    public void connectionAcquiredEvent(
            @ProbeParam("poolName") String poolName,
            @ProbeParam("appName") String appName) {
        if((poolName != null) && (poolName.equals(this.poolName))) {
            if (appName != null && appName.equals(this.appName)) {
                numConnAcquired.increment();
            }
        }
    }

    /**
     * When a connection is released increment counter
     */
    @ProbeListener(JDBC_APP_PROBE_LISTENER + "connectionReleasedEvent")
    public void connectionReleasedEvent(
            @ProbeParam("poolName") String poolName,
            @ProbeParam("appName") String appName) {
        if((poolName != null) && (poolName.equals(this.poolName))) {
            if (appName != null && appName.equals(this.appName)) {
                numConnReleased.increment();
            }
        }
    }

    @ManagedAttribute(id="numconnused")
    public RangeStatistic getNumConnUsed() {
        return numConnUsed;
    }

    @ManagedAttribute(id="numconnacquired")
    public CountStatistic getNumConnAcquired() {
        return numConnAcquired;
    }

    @ManagedAttribute(id="numconnreleased")
    public CountStatistic getNumConnReleased() {
        return numConnReleased;
    }

}