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The Java Execution Time Measurement Library core package
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/*
 *
 * Copyright (c) 2004, 2005, 2006, 2007 void.fm
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this list
 * of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice, this
 * list of conditions and the following disclaimer in the documentation and/or
 * other materials provided with the distribution.
 *
 * Neither the name void.fm nor the names of its contributors may be
 * used to endorse or promote products derived from this software without specific
 * prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

package etm.core.monitor;

import etm.core.aggregation.Aggregator;
import etm.core.timer.ExecutionTimer;

/**
 * 
 * The NestedMonitor records nested EtmPoints as a tree using ThreadLocals
 * to maintain the thread depend caller tree.
 * 
 * 
 * Be aware that leaking EtmPoints will lead to unexpected results - so
 * always ensure you call EtmPoint.collect() in a finally clause.
 * 
 *
 * @author Jens Schumann
 * @version $Revision: 150 $
 */
public class NestedMonitor extends EtmMonitorSupport {

  private static final String DESCRIPTION = "A monitor recording nested executions as a tree.";
  private ThreadLocal currentParent = new ThreadLocal();

  public NestedMonitor() {
    this(null, null);
  }

  public NestedMonitor(ExecutionTimer aTimer) {
    this(aTimer, null);
  }

  public NestedMonitor(Aggregator aAggregator) {
    this(null, aAggregator);
  }

  public NestedMonitor(ExecutionTimer aTimer, Aggregator aAggregator) {
    super(DESCRIPTION, aTimer, aAggregator);
  }

  protected void doVisitPreMeasurement(MeasurementPoint measurementPoint) {
    MeasurementPoint point = (MeasurementPoint) currentParent.get();
    currentParent.set(measurementPoint);
    measurementPoint.setParent(point);
  }

  protected void doVisitPostCollect(MeasurementPoint aPoint) {
    EtmPoint point = (EtmPoint) currentParent.get();
    if (point != null) {
      currentParent.set(point.getParent());
    }
  }

  public String toString() {
    return "etm.core.monitor.NestedMonitor{ timer=<" + timer + ">, aggregator=<" + aggregator + "> }";
  }

}