testappender.java

comming logging 的源码 可以封装log4j等日志系统。 源码中使用了很多的设计模式

/*
 * 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 org.apache.commons.logging.log4j.log4j12;


import java.util.List;

import org.apache.commons.logging.log4j.StandardTests;
import org.apache.log4j.AppenderSkeleton;
import org.apache.log4j.spi.LoggingEvent;

/**
 * A custom implementation of <code>org.apache.log4j.Appender</code> which
 * converts the log4j-specific log event record into a representation that
 * doesn't have a dependency on log4j and stores that new representation into
 * an external list.
 */

public class TestAppender extends AppenderSkeleton {

    /**
     * Constructor.
     */
    public TestAppender(List logEvents) {
        events = logEvents;
    }

    // ----------------------------------------------------- Instance Variables


    // The set of logged events for this appender
    private List events;


    // ------------------------------------------------------- Appender Methods

    protected void append(LoggingEvent event) {
        StandardTests.LogEvent lev = new StandardTests.LogEvent();
        
        lev.level = event.getLevel().toString();

        if (event.getMessage() == null)
            lev.msg = null;
        else
            lev.msg = event.getMessage().toString();
        
        if (event.getThrowableInformation() == null)
            lev.throwable = null;
        else
            lev.throwable = event.getThrowableInformation().getThrowable();

        events.add(lev);
    }


    public void close() {
    }


    public boolean requiresLayout() {
        return (false);
    }


}