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/*
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 * 
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 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
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 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
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 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
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package org.glassfish.pfl.tf.timer.impl ;

import java.util.ArrayList ;
import java.util.Stack ;
import java.util.Map ;
import java.util.HashMap ;
import org.glassfish.pfl.tf.timer.spi.Controllable;
import org.glassfish.pfl.tf.timer.spi.NamedBase;
import org.glassfish.pfl.tf.timer.spi.Statistics;
import org.glassfish.pfl.tf.timer.spi.StatisticsAccumulator;
import org.glassfish.pfl.tf.timer.spi.StatsEventHandler;
import org.glassfish.pfl.tf.timer.spi.Timer;
import org.glassfish.pfl.tf.timer.spi.TimerEvent;
import org.glassfish.pfl.tf.timer.spi.TimerFactory;

public abstract class StatsEventHandlerBase extends NamedBase
    implements StatsEventHandler {
    protected static final String UNITS = "nanoseconds" ;
    
    // indexed by Timer.id()
    protected ArrayList saList ; 
    
    protected StatsEventHandlerBase( TimerFactory factory, String name ) {
	super( factory, name ) ;

	// Note that this implies that no timers or timergroups are created
	// after the StatsEventHandler is created.  We should probably fix this.
	int size = factory.numberOfIds() ;
	saList = new ArrayList( size ) ;
	for (int ctr=0; ctr teStack, TimerEvent event ) {
	Timer timer = event.timer() ;
	int id = timer.id() ;

	if (event.type() == TimerEvent.TimerEventType.ENTER) {
	    // push this event onto the Timer stack
	    teStack.push( event ) ;
	} else {
	    // pop off the ENTER event, record duration
	    if (teStack.empty()) {
		throw new IllegalStateException( 
		    "Unexpected empty stack for EXIT event on timer " + timer ) ;
	    } else {
		TimerEvent enter = teStack.pop() ;
		if (!timer.equals( enter.timer() ))
		    throw new IllegalStateException(
			"Expected timer " + timer + " but found timer "
			    + enter.timer() + " on the TimerEvent stack" ) ;

		long duration = event.time() - enter.time() ;

		// Remove the contribution of nested calls from
		// the time for all outer calls.
		for (TimerEvent ev : teStack) {
		    ev.incrementTime( duration ) ;
		}

		recordDuration( id, duration ) ;
	    }
	}
    }

    public Map stats() {
	Map result = new HashMap() ;
	for (int ctr=0; ctr