/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
 * 
 * The contents of this file are subject to the terms of either the GNU
 * 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 https://glassfish.dev.java.net/public/CDDL+GPL.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 * 
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
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 * elects to include this software in this distribution under the [CDDL or GPL
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 * its licensees as provided above.  However, if you add GPL Version 2 code
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package com.sun.appserv.management.util.jmx;

import javax.management.*;
import java.io.IOException;
import java.io.PrintStream;
import java.util.Map;
import java.util.HashMap;
import java.util.Collections;

import com.sun.appserv.management.util.misc.Output;



/**
	This class allows use of MBeanServerConnection methods with ObjectName patterns
	that resolve to a single MBean.  This is useful to avoid hard-coupling to specific
	ObjectNames; instead an ObjectName pattern may be used which resolves to a 
	single MBean.
	
	For example, if you know the 'name' property is unique (at least for your MBean),
	you could use the ObjectName "*:name=myname,*" instead of a possibly much longer
	and complicated name (which potentially could change each time the MBean is registered).
 */
public class MBeanServerConnection_Perf
	extends MBeanServerConnection_Hook
{
	private final PerfHook	mHook;
	private final Output	mOutput;
	private  boolean		mPerfEnabled;
	
		public
	MBeanServerConnection_Perf(
		MBeanServerConnection	impl,
		Output					output )
	{
		super( impl );
		
		mOutput			= output;
		mHook			= new PerfHook();
		mPerfEnabled	= true;
	}
	
		public final boolean
	getPerf()
	{
		return( mPerfEnabled );
	}
	
		public final void
	setPerf( final boolean perfEnabled)
	{
		mPerfEnabled	= perfEnabled;
	}
	
		protected final Hook
	getHook()
	{
		return( mHook );
	}
	
	private final static Object []	EMPTY_ARRAY	= new Object [ 0 ];
		
	private final class PerfHook extends MBeanServerConnection_Hook.HookImpl
	{
		private final Map<Long,Long>	mTimers;
		
			public
		PerfHook()
		{
			mTimers	= Collections.synchronizedMap( new HashMap<Long,Long>() );
		}
		
			private final void
		print( Object o )
		{
			if ( getPerf() )
			{
				mOutput.printDebug( o );
			}
		}
		
			public long
		preHook( String methodName )
		{
			return( preHook( methodName, EMPTY_ARRAY ) );
		}
		
			public long
		preHook( String methodName, Object [] args )
		{
			final long	id	= super.preHook( methodName, args);

			final Long	start	= new Long( System.currentTimeMillis() );
			mTimers.put( new Long( id ), start );
			
			return( id );
		}
		
			private void
		printTime( final long id, final String methodName, final Object[] args )
		{
			final long	curTime	= System.currentTimeMillis();
			final Long	start	= (Long)mTimers.remove( new Long( id ) );
			if ( start != null )
			{
				mOutput.println( getInvocationString( methodName, args ) + ": " +
					(curTime - start.longValue()) );
			}
		}
		
			public void
		postHook( long id, String methodName )
		{
			printTime( id, methodName, null);
		}
		
			public void
		postHook( long id, String methodName, Object [] args )
		{
			printTime( id, methodName, args);
		}
		
			public void
		postHook( long id, String methodName, Object [] args, Object result )
		{
			printTime( id, methodName, args);
		}
	}
};