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Enterprise Job Scheduler
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package org.quartz.core;

import java.util.Timer;

import org.quartz.JobDetail;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;
import org.quartz.JobListener;
import org.quartz.SchedulerListener;
import org.quartz.Trigger;
import org.quartz.listeners.SchedulerListenerSupport;
import org.quartz.utils.counter.CounterConfig;
import org.quartz.utils.counter.CounterManager;
import org.quartz.utils.counter.CounterManagerImpl;
import org.quartz.utils.counter.sampled.SampledCounter;
import org.quartz.utils.counter.sampled.SampledCounterConfig;
import org.quartz.utils.counter.sampled.SampledRateCounterConfig;

public class SampledStatisticsImpl extends SchedulerListenerSupport implements SampledStatistics, JobListener, SchedulerListener {
    @SuppressWarnings("unused")
    private final QuartzScheduler scheduler;
    
    private static final String NAME = "QuartzSampledStatistics";
    
    private static final int DEFAULT_HISTORY_SIZE = 30;
    private static final int DEFAULT_INTERVAL_SECS = 1;
    private final static SampledCounterConfig DEFAULT_SAMPLED_COUNTER_CONFIG = new SampledCounterConfig(DEFAULT_INTERVAL_SECS,
            DEFAULT_HISTORY_SIZE, true, 0L);
    @SuppressWarnings("unused")
    private final static SampledRateCounterConfig DEFAULT_SAMPLED_RATE_COUNTER_CONFIG = new SampledRateCounterConfig(DEFAULT_INTERVAL_SECS,
            DEFAULT_HISTORY_SIZE, true);

    private volatile CounterManager counterManager;
    private final SampledCounter jobsScheduledCount;
    private final SampledCounter jobsExecutingCount;
    private final SampledCounter jobsCompletedCount;
    
    SampledStatisticsImpl(QuartzScheduler scheduler) {
        this.scheduler = scheduler;
        
        counterManager = new CounterManagerImpl(new Timer(NAME+"Timer"));
        jobsScheduledCount = createSampledCounter(DEFAULT_SAMPLED_COUNTER_CONFIG);
        jobsExecutingCount = createSampledCounter(DEFAULT_SAMPLED_COUNTER_CONFIG);
        jobsCompletedCount = createSampledCounter(DEFAULT_SAMPLED_COUNTER_CONFIG);
        
        scheduler.addInternalSchedulerListener(this);
        scheduler.addInternalJobListener(this);
    }
    
    public void shutdown() {
        counterManager.shutdown(true);
    }
    
    private SampledCounter createSampledCounter(CounterConfig defaultCounterConfig) {
        return (SampledCounter) counterManager.createCounter(defaultCounterConfig);
    }
    
    /**
     * Clears the collected statistics. Resets all counters to zero
     */
    public void clearStatistics() {
        jobsScheduledCount.getAndReset();
        jobsExecutingCount.getAndReset();
        jobsCompletedCount.getAndReset();
    }
    
    public long getJobsCompletedMostRecentSample() {
        return jobsCompletedCount.getMostRecentSample().getCounterValue();
    }

    public long getJobsExecutingMostRecentSample() {
        return jobsExecutingCount.getMostRecentSample().getCounterValue();
    }

    public long getJobsScheduledMostRecentSample() {
        return jobsScheduledCount.getMostRecentSample().getCounterValue();
    }

    public String getName() {
        return NAME;
    }

    @Override
    public void jobScheduled(Trigger trigger) {
        jobsScheduledCount.increment();
    }
    
    public void jobExecutionVetoed(JobExecutionContext context) {
        /**/
    }

    public void jobToBeExecuted(JobExecutionContext context) {
        jobsExecutingCount.increment();
    }

    public void jobWasExecuted(JobExecutionContext context,
            JobExecutionException jobException) {
        jobsCompletedCount.increment();
    }

    @Override
    public void jobAdded(JobDetail jobDetail) {
        /**/
    }

    public void jobDeleted(String jobName, String groupName) {
        /**/
    }
}