Java tutorial
/* * 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.liulangf.pattern.gof.behavioral.chain.jakarta.simple; import org.apache.commons.chain.Command; import org.apache.commons.chain.Context; import org.apache.commons.chain.web.WebContext; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; /** * <p>Bar Command</p> * * @version $Revision: 532952 $ $Date: 2007-04-27 05:00:53 +0100 (Fri, 27 Apr 2007) $ */ public class CountCommand implements Command { private Log log = LogFactory.getLog(CountCommand.class); private int count; private String attribute = "count"; /** * Return the request attribute name to store the count under. * * @return The name of the request attribute */ public String getAttribute() { return attribute; } /** * Set the request attribute name to store the count under. * * @param attribute The name of the request attribute */ public void setAttribute(String attribute) { this.attribute = attribute; } /** * <p>Execute the command.</p> * * @param context The {@link Context} we are operating on * @return <code>false</code> so that processng will continue * @throws Exception If an error occurs during execution. */ @SuppressWarnings("unchecked") public boolean execute(Context context) throws Exception { count++; log.info("Executing: " + attribute + "=" + count); WebContext webContext = (WebContext) context; webContext.getSessionScope().put(attribute, new Integer(count)); return false; } }