001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache license, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the license for the specific language governing permissions and
015 * limitations under the license.
016 */
017package org.apache.logging.log4j.core.appender.rolling;
018
019import java.lang.reflect.Method;
020
021import org.apache.logging.log4j.core.LogEvent;
022import org.apache.logging.log4j.core.config.plugins.Plugin;
023import org.apache.logging.log4j.core.config.plugins.PluginFactory;
024import org.apache.logging.log4j.core.util.Loader;
025import org.apache.logging.log4j.status.StatusLogger;
026
027/**
028 * Triggers a rollover on every restart, but only if the file size is greater than zero.
029 */
030@Plugin(name = "OnStartupTriggeringPolicy", category = "Core", printObject = true)
031public class OnStartupTriggeringPolicy implements TriggeringPolicy {
032    private RollingFileManager manager;
033
034    /**
035     * Provide the RollingFileManager to the policy.
036     * @param manager The RollingFileManager.
037     */
038    @Override
039    public void initialize(final RollingFileManager manager) {
040        this.manager = manager;
041        if (manager.getFileSize() > 0) {
042            manager.skipFooter(true);
043            manager.rollover();
044            manager.skipFooter(false);
045        }
046    }
047
048    /**
049     * Determine if a rollover should be triggered.
050     * @param event   A reference to the current event.
051     * @return true if the target file's timestamp is older than the JVM start time.
052     */
053    @Override
054    public boolean isTriggeringEvent(final LogEvent event) {
055        return false;
056    }
057
058    @Override
059    public String toString() {
060        return "OnStartupTriggeringPolicy";
061    }
062
063    @PluginFactory
064    public static OnStartupTriggeringPolicy createPolicy() {
065        return new OnStartupTriggeringPolicy();
066    }
067}