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     */
017    package org.apache.logging.log4j.core.appender.rolling;
018    
019    import org.apache.logging.log4j.core.LogEvent;
020    import org.apache.logging.log4j.core.config.plugins.Plugin;
021    import org.apache.logging.log4j.core.config.plugins.PluginFactory;
022    
023    import java.lang.management.ManagementFactory;
024    
025    /**
026     * Trigger a rollover on every restart. The target file's timestamp is compared with the JVM start time
027     * and if it is older isTriggeringEvent will return true. After isTriggeringEvent has been called it will
028     * always return false.
029     */
030    
031    @Plugin(name = "OnStartupTriggeringPolicy", category = "Core", printObject = true)
032    public class OnStartupTriggeringPolicy implements TriggeringPolicy {
033        private static final long JVM_START_TIME = ManagementFactory.getRuntimeMXBean().getStartTime();
034    
035        private boolean evaluated = false;
036    
037        private RollingFileManager manager;
038    
039        /**
040         * Provide the RollingFileManager to the policy.
041         * @param manager The RollingFileManager.
042         */
043        @Override
044        public void initialize(final RollingFileManager manager) {
045            this.manager = manager;
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            if (evaluated) {
056                return false;
057            }
058            evaluated = true;
059            return manager.getFileTime() < JVM_START_TIME;
060        }
061    
062        @Override
063        public String toString() {
064            return "OnStartupTriggeringPolicy";
065        }
066    
067        @PluginFactory
068        public static OnStartupTriggeringPolicy createPolicy() {
069            return new OnStartupTriggeringPolicy();
070        }
071    }