content: /*
   *  Copyright Beijing 58 Information Technology Co.,Ltd.
   *
   *  Licensed to the Apache Software Foundation (ASF) under one
   *  or more contributor license agreements.  See the NOTICE file
   *  distributed with this work for additional information
   *  regarding copyright ownership.  The ASF licenses this file
   *  to you under the Apache License, Version 2.0 (the
   *  "License"); you may not use this file except in compliance
   *  with the License.  You may obtain a copy of the License at
   *
   *        http://www.apache.org/licenses/LICENSE-2.0
   *
   *  Unless required by applicable law or agreed to in writing,
   *  software distributed under the License is distributed on an
   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   *  KIND, either express or implied.  See the License for the
   *  specific language governing permissions and limitations
   *  under the License.
   */
  package com.bj58.spat.gaea.server.performance;
  
  import java.nio.ByteBuffer;
  import java.util.concurrent.ExecutorService;
  import java.util.concurrent.Executors;
  
  import org.jboss.netty.buffer.ChannelBuffer;
  import org.jboss.netty.channel.Channel;
  import org.jboss.netty.channel.MessageEvent;
  
  import com.bj58.spat.gaea.server.contract.context.Global;
  import com.bj58.spat.gaea.server.contract.context.GaeaContext;
  import com.bj58.spat.gaea.server.contract.filter.IFilter;
  import com.bj58.spat.gaea.server.contract.log.ILog;
  import com.bj58.spat.gaea.server.contract.log.LogFactory;
  import com.bj58.spat.gaea.server.filter.MonitorRequestFilter;
  import com.bj58.spat.gaea.server.filter.MonitorResponseFilter;
  
  /**
   * 
   * @author Service Platform Architecture Team (spat@58.com)
   */
  public class MonitorCenter {
  
  	/**
  	 * thread pool
  	 */
  	private static ExecutorService executor = Executors.newCachedThreadPool();
  	
  	/**
  	 * MonitorRequestFilter
  	 */
  	private static IFilter monitorRequestFilter = new MonitorRequestFilter();
  	
  	/**
  	 * MonitorResponseFilter
  	 */
  	private static IFilter monitorResponseFilter = new MonitorResponseFilter();
  
  	/**
  	 * log
  	 */
  	private static ILog logger = LogFactory.getLogger(MonitorCenter.class);
  	
  	private static Command command = null;
  
  	/**
  	 * monitor event receive
  	 * 
  	 * @param e
  	 * @throws Exception
  	 * 
  	 */
  	public static void messageReceived(MessageEvent e) throws Exception {
  		ByteBuffer buffer = ((ChannelBuffer) e.getMessage()).toByteBuffer();
  		byte[] reciveByte = buffer.array();
  		String msg = new String(reciveByte, "utf-8");
  		
  		command = Command.create(msg);
  		logger.info("command:" + msg + "--commandType:" + command.getCommandType());
  		command.exec(e);
  		
  		removeChannel(e.getChannel());
  	}
  
  	/**
  	 * add monitor filter
  	 */
  	public synchronized static void addFilter() {
  		if (!Global.getSingleton().getGlobalRequestFilterList().contains(monitorRequestFilter)) {
  			logger.info("add monitorRequestFilter");
  			Global.getSingleton().addGlobalRequestFilter(monitorRequestFilter);
  		}
  		if (!Global.getSingleton().getGlobalResponseFilterList().contains(monitorResponseFilter)) {
  			logger.info("add monitorResponseFilter");
  			Global.getSingleton().addGlobalResponseFilter(monitorResponseFilter);
  		}
  	}
  
  	/**
  	 * remove monitor filter
  	 */
  	public synchronized static void removeFilter() {
  		Global.getSingleton().removeGlobalRequestFilter(monitorRequestFilter);
  		Global.getSingleton().removeGlobalResponseFilter(monitorResponseFilter);
  		logger.info("remove monitorRequestFilter");
  		logger.info("remove monitorResponseFilter");
  	}
  
  
  	/**
  	 * add monitor task
  	 * @param context
  	 */
  	public static void addMonitorTask(final GaeaContext context) {
  		executor.execute(new Runnable() {
  			public void run() {
  				if(command != null) {
  					command.messageReceived(context);
  				}
  			}
  		});
  	}
  	
  	
  	public static void removeChannel(Channel channel) {
  		if(command != null) {
  			command.removeChannel(channel);
  			
  			if(command.getChannelCount() <= 0) {
  				removeFilter();
  			}
  		}
  	}
  }