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XWork is an command-pattern framework that is used to power WebWork as well as other applications. XWork provides an Inversion of Control container, a powerful expression language, data type conversion, validation, and pluggable configuration.

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/*
 * Copyright (c) 2002-2006 by OpenSymphony
 * All rights reserved.
 */
package com.opensymphony.xwork2.interceptor;

import com.opensymphony.xwork2.ActionInvocation;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;


/**
 * 
 * This interceptor logs the the start and end of the execution an action (in English-only, not internationalized).
 * 
 *
 * 
 * There are no parameters for this interceptor.
 * 
 *
 * 
 * There are no obvious extensions to the existing interceptor.
 * 
 *
 *  * 
 * <!-- prints out a message before and after the immediate action execution -->
 * <action name="someAction" class="com.examples.SomeAction">
 *     <interceptor-ref name="completeStack"/>
 *     <interceptor-ref name="logger"/>
 *     <result name="success">good_result.ftl</result>
 * </action>
 *
 * <!-- prints out a message before any more interceptors continue and after they have finished -->
 * <action name="someAction" class="com.examples.SomeAction">
 *     <interceptor-ref name="logger"/>
 *     <interceptor-ref name="completeStack"/>
 *     <result name="success">good_result.ftl</result>
 * </action>
 * 
 * 
 *
 * @author Jason Carreira
 */
public class LoggingInterceptor extends AbstractInterceptor {
    private static final Log log = LogFactory.getLog(LoggingInterceptor.class);
    private static final String FINISH_MESSAGE = "Finishing execution stack for action ";
    private static final String START_MESSAGE = "Starting execution stack for action ";

    public String intercept(ActionInvocation invocation) throws Exception {
        logMessage(invocation, FINISH_MESSAGE);
        String result = invocation.invoke();
        logMessage(invocation, START_MESSAGE);
        return result;
    }

    private void logMessage(ActionInvocation invocation, String baseMessage) {
        if (log.isInfoEnabled()) {
            StringBuffer message = new StringBuffer(baseMessage);
            String namespace = invocation.getProxy().getNamespace();

            if ((namespace != null) && (namespace.trim().length() > 0)) {
                message.append(namespace).append("/");
            }

            message.append(invocation.getProxy().getActionName());
            log.info(message.toString());
        }
    }

}