org.jwall.log.LogMessageProcessorPipeline Maven / Gradle / Ivy

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/*
 *  Copyright (C) 2007-2014 Christian Bockermann 
 *
 *  This file is part of the  web-audit  library.
 *
 *  web-audit library is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  The  web-audit  library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see .
 *
 */
package org.jwall.log;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.Map;

import org.jwall.audit.EventProcessor;
import org.jwall.audit.EventProcessorException;
import org.jwall.audit.EventProcessorPipeline;

public class LogMessageProcessorPipeline 
implements EventProcessorPipeline 
{
	final Order> order = new Order>();
	ArrayList> eventProcessors = new ArrayList>();

	/**
	 * @see org.jwall.audit.EventProcessorPipeline#process(org.jwall.audit.Event)
	 */
	@Override
	public void process(LogMessage event) throws EventProcessorException {
		Map context = new HashMap();

		for( EventProcessor proc : eventProcessors ){
			try {
				proc.processEvent( event, context );
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}


	/**
	 * @see org.jwall.audit.EventProcessorPipeline#register(java.lang.Double, org.jwall.audit.EventProcessor)
	 */
	@Override
	public void register(Double priority, EventProcessor proc) {
		synchronized( eventProcessors ){
			order.set( proc, priority );
			eventProcessors.add( proc );
			Collections.sort( eventProcessors, order );
		}
	}


	/**
	 * @see org.jwall.audit.EventProcessorPipeline#unregister(org.jwall.audit.EventProcessor)
	 */
	@Override
	public void unregister(EventProcessor proc) {
		synchronized( eventProcessors ){
			order.unset( proc );
			eventProcessors.remove( proc );
			Collections.sort( eventProcessors, order );
		}
	}


	protected final class Order implements Comparator {

		Map prios;

		public Order(){
			prios = new HashMap();
		}

		public Order( Map prios ){
			this.prios = prios;
		}

		public void set( T key, Double prio ){
			prios.put( key, prio );
		}

		public void unset( T key ){
			prios.remove( key );
		}


		@Override
		public int compare(T arg0, T arg1) {

			if(arg0 == arg1 || arg0.equals( arg1 ) )
				return 0;

			Double p1 = prios.get( arg0 );
			Double p2 = prios.get( arg1 );

			if( p1 == null && p2 == null )
				return -1;

			if( p1 == null )
				return -1;

			if( p2 == null )
				return 1;

			int rc = p1.compareTo( p2 );
			if( rc == 0 )
				return arg0.toString().compareTo( arg1.toString() );
			return rc;
		}

	}


	@Override
	public Double getPriority(EventProcessor proc) {
		return Double.NaN;
	}
}