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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements. See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache license, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License. You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the license for the specific language governing permissions and
15   * limitations under the license.
16   */
17  package org.apache.logging.log4j.core.appender.rolling;
18  
19  import java.lang.reflect.Method;
20  
21  import org.apache.logging.log4j.core.LogEvent;
22  import org.apache.logging.log4j.core.config.plugins.Plugin;
23  import org.apache.logging.log4j.core.config.plugins.PluginFactory;
24  import org.apache.logging.log4j.core.util.Loader;
25  import org.apache.logging.log4j.status.StatusLogger;
26  
27  /**
28   * Triggers a rollover on every restart, but only if the file size is greater than zero.
29   */
30  @Plugin(name = "OnStartupTriggeringPolicy", category = "Core", printObject = true)
31  public class OnStartupTriggeringPolicy implements TriggeringPolicy {
32      private RollingFileManager manager;
33  
34      /**
35       * Provide the RollingFileManager to the policy.
36       * @param manager The RollingFileManager.
37       */
38      @Override
39      public void initialize(final RollingFileManager manager) {
40          this.manager = manager;
41          if (manager.getFileSize() > 0) {
42              manager.skipFooter(true);
43              manager.rollover();
44              manager.skipFooter(false);
45          }
46      }
47  
48      /**
49       * Determine if a rollover should be triggered.
50       * @param event   A reference to the current event.
51       * @return true if the target file's timestamp is older than the JVM start time.
52       */
53      @Override
54      public boolean isTriggeringEvent(final LogEvent event) {
55          return false;
56      }
57  
58      @Override
59      public String toString() {
60          return "OnStartupTriggeringPolicy";
61      }
62  
63      @PluginFactory
64      public static OnStartupTriggeringPolicy createPolicy() {
65          return new OnStartupTriggeringPolicy();
66      }
67  }