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package com.sun.enterprise.management.monitor;

import java.lang.reflect.Method;
import java.lang.reflect.InvocationTargetException;

import javax.management.ObjectName;
import javax.management.MBeanServer;
import javax.management.Attribute;
import javax.management.MBeanAttributeInfo;
import javax.management.MBeanException;
import javax.management.ReflectionException;
import javax.management.AttributeNotFoundException;
import javax.management.InvalidAttributeValueException;
import javax.management.monitor.Monitor;

import com.sun.appserv.management.base.XTypes;
import com.sun.appserv.management.base.AMX;
import com.sun.appserv.management.base.Util;
import com.sun.appserv.management.monitor.JMXMonitorMgr;

import com.sun.enterprise.management.support.AMXImplBase;
import com.sun.enterprise.management.support.Delegate;

import com.sun.appserv.management.util.misc.ClassUtil;
import com.sun.appserv.management.util.jmx.JMXUtil;


/**
	Implementation of javax.management.monitor.StringMonitor which is an AMX.
*/
public class JMXMonitorBase extends AMXImplBase
	// implements AMXStringMonitor
{
	final Monitor	mMonitor;
	
	/**
		Because we want our implementation to be an AMX, we will extend appropriately,
		but this means that we must delegate javax.management.StringMonitor functionality
		to an instance of that class.
	 */

		protected
	JMXMonitorBase( final Monitor mon )
	{
		mMonitor	= mon;
	}
	
	
	
		public String
	getGroup()
	{
		return( AMX.GROUP_UTILITY );
	}
	
	
		protected Object
	getAttributeManually( String name )
		throws AttributeNotFoundException
	{
		final MBeanAttributeInfo	attrInfo	= (MBeanAttributeInfo)getAttributeInfos().get( name );
		assert( attrInfo != null );	// getAttributeManually() should not have been called otherwise
		
		final String	prefix	= attrInfo.isIs() ? JMXUtil.IS : JMXUtil.GET;
		final String	operationName	= prefix + name;
		
		Object	result	= null;
		try
		{
			result	= invokeManually( operationName, null, null );
		}
		catch( Exception e )
		{
			throw new AttributeNotFoundException( name );
		}
		
		return( result );
	}
	
		protected void
	setAttributeManually( final Attribute attr )
		throws AttributeNotFoundException, InvalidAttributeValueException
	{
		final String	operationName	= JMXUtil.SET + attr.getName();
		final MBeanAttributeInfo	attrInfo	= (MBeanAttributeInfo)getAttributeInfos().get( attr.getName() );
		
		Object	result	= null;
		try
		{
			final Object	value	= attr.getValue();
			// won't work to get the class from the value; must use MBeanInfo
			final Class	theClass	= ClassUtil.getClassFromName( attrInfo.getType() );
			
			result	= invokeSig( operationName,
				new Object[] { value }, new Class[] { theClass } );
			assert( result == null );
		}
		catch( Exception e )
		{
			throw new AttributeNotFoundException( attr.getName() );
		}
	}
	
		private Object
	invokeSig(
		String 		operationName,
		Object[]	args,
		Class[]		sig )
		throws MBeanException, ReflectionException, NoSuchMethodException
	{
		Object	result	= null;
		
		try
		{
			final Method	m	= mMonitor.getClass().getMethod( operationName, sig );
			
			result	= m.invoke( mMonitor, args );
		}
		catch( Exception e )
		{
			throw new RuntimeException( e );
		}

		return( result );
	}
	
	
		protected Object
	invokeManually(
		String 		operationName,
		Object[]	args,
		String[]	types )
		throws MBeanException, ReflectionException, NoSuchMethodException
	{
		Object	result	= null;
		
		try
		{
			final Class[]	sig	= ClassUtil.signatureFromClassnames( types );
			
			result	= invokeSig( operationName, args, sig );
		}
		catch( Exception e )
		{
			e.printStackTrace();
			throw new RuntimeException( e );
		}

		return( result );
	}
	
		public void
	preRegisterDone()
		throws Exception
	{
		final ObjectName	x	= mMonitor.preRegister( getMBeanServer(), getObjectName() );
	}
	
		public void
	postRegisterHook( Boolean registrationDone )
	{
		super.postRegisterHook( registrationDone );
		
		mMonitor.postRegister( registrationDone );
	}
	
		public void
	preDeregisterHook()
	{
		super.preDeregisterHook( );
		
		try
		{
		    mMonitor.preDeregister( );
		}
		catch( Exception e )
		{
		    throw new RuntimeException( e );
		}
	}
	
		public void
	postDeregisterHook()
	{
		super.postDeregisterHook( );
		
		mMonitor.postDeregister( );
	}
	
	
	
}