statisticsservice.java

来自「spring的WEB开发插件,支持多状态WEB开发」· Java 代码 · 共 155 行

/*
 * Copyright 2002-2005 the original author or authors.
 *
 * Licensed 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 org.springframework.webflow.execution.jmx;

import java.util.List;

import javax.management.MBeanServer;
import javax.management.MBeanServerFactory;
import javax.management.ObjectName;

import org.springframework.beans.factory.DisposableBean;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.webflow.FlowSession;
import org.springframework.webflow.RequestContext;
import org.springframework.webflow.execution.FlowExecutionListener;
import org.springframework.webflow.execution.FlowExecutionListenerAdapter;
import org.springframework.webflow.execution.FlowExecutionManager;

/**
 * Managed service that collects statistics on the web flow system.
 * 
 * @author Keith Donald
 */
public class StatisticsService implements InitializingBean, DisposableBean {
	
	private FlowExecutionManager flowExecutionManager;

	private GlobalStatistics globalStats = new GlobalStatistics();

	private FlowExecutionListener statisticsCollector = new StatisticsCollector();

	private MBeanServer mbeanServer;

	private ObjectName globalStatsMBeanName;

	public StatisticsService(FlowExecutionManager flowExecutionManager) {
		this.flowExecutionManager = flowExecutionManager;
	}

	public void setMBeanServer(MBeanServer mbeanServer) {
		this.mbeanServer = mbeanServer;
	}
	
	public void setEnabled(boolean enabled) {
		this.globalStats.setStatisticsEnabled(enabled);
	}

	public void afterPropertiesSet() throws Exception {
		// register global stats mbean
		if (mbeanServer == null) {
			List servers = MBeanServerFactory.findMBeanServer(null);
			mbeanServer = (MBeanServer) servers.get(0);
		}
		globalStatsMBeanName = new ObjectName("spring-webflow", "type",	"globalStatistics");
		mbeanServer.registerMBean(globalStats, globalStatsMBeanName);
		this.flowExecutionManager.addListener(statisticsCollector);
	}

	public void destroy() throws Exception {
		mbeanServer.unregisterMBean(globalStatsMBeanName);
		this.flowExecutionManager.removeListener(statisticsCollector);
	}

	protected final class StatisticsCollector extends FlowExecutionListenerAdapter {
		
		protected boolean statisticsEnabled(RequestContext context) {
			return globalStats.statisticsEnabled;
		}

		public void paused(RequestContext context) {
			if (statisticsEnabled(context)) {
				globalStats.pausedFlowExecutionCount++;
			}
		}

		public void requestProcessed(RequestContext context) {
			if (statisticsEnabled(context)) {
				globalStats.requestsInProcessCount--;
			}
		}

		public void requestSubmitted(RequestContext context) {
			if (statisticsEnabled(context)) {
				globalStats.totalRequestCount++;
				globalStats.requestsInProcessCount++;
			}
		}

		public void resumed(RequestContext context) {
			if (statisticsEnabled(context)) {
				globalStats.pausedFlowExecutionCount--;
				globalStats.activeFlowExecutionCount++;
			}
		}

		public void sessionEnded(RequestContext context,
				FlowSession endedSession) {
			if (statisticsEnabled(context)) {
				if (endedSession.isRoot()) {
					globalStats.endedFlowExecutionCount++;
					globalStats.managedFlowExecutionCount--;
					globalStats.activeFlowExecutionCount--;
					/* TODO try {
						Hashtable keys = new Hashtable();
						keys.put("id", endedSession.getFlow().getId());
						keys.put("type", "flowExecution");
						ObjectName name = new ObjectName("spring-webflow", keys);
						mbeanServer.unregisterMBean(name);
					} catch (JMException e) {
						System.out.println(e);
					}
					*/
				}
			}
		}

		public void sessionStarted(RequestContext context) {
			if (statisticsEnabled(context)) {
				if (context.getFlowExecutionContext().isRootFlowActive()) {
					globalStats.totalFlowExecutionCount++;
					globalStats.managedFlowExecutionCount++;
					/* TODO
					try {
						FlowExecution execution = (FlowExecution) context
								.getFlowExecutionContext();
						FlowExecutionMBean mbean = new FlowExecutionMBeanAdapter(
								execution);
						Hashtable keys = new Hashtable();
						// temp
						keys.put("id", execution.getActiveFlow().getId());
						keys.put("type", "flowExecution");
						ObjectName name = new ObjectName("spring-webflow", keys);
						mbeanServer.registerMBean(new StandardMBean(mbean, FlowExecutionMBean.class), name);
					} catch (JMException e) {
						System.out.println(e);
					}
					*/
				}
			}
		}
	}
}