MonitorProbe.java

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package com.sun.tools.visualvm.modules.tracer.monitor;

import com.sun.tools.visualvm.application.Application;
import com.sun.tools.visualvm.application.jvm.MonitoredData;
import com.sun.tools.visualvm.modules.tracer.ProbeItemDescriptor;
import com.sun.tools.visualvm.modules.tracer.TracerProbe;
import java.util.Arrays;

/**
 *
 * @author Jiri Sedlacek
 */
abstract class MonitorProbe extends TracerProbe<Application> {

    private final MonitoredDataResolver resolver;

    private final int valuesCount;


    MonitorProbe(int valuesCount, ProbeItemDescriptor[] itemDescriptors,
                 MonitoredDataResolver resolver) {
        super(itemDescriptors);
        this.valuesCount = valuesCount;
        this.resolver = resolver;
    }


    public synchronized final long[] getItemValues(long timestamp) {
        MonitoredData data = resolver.getMonitoredData(timestamp);
        if (data != null) return getValues(data);
        
        long[] noData = new long[valuesCount];
        Arrays.fill(noData, ProbeItemDescriptor.VALUE_UNDEFINED);
        return noData;
    }

    abstract long[] getValues(MonitoredData data);


    static interface MonitoredDataResolver {
        public MonitoredData getMonitoredData(long timestamp);
    }

}