Coverage report

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org.apache.commons.configuration.reloading.FileChangedReloadingStrategy
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 1  
 /*
 2  
  * Copyright 2001-2005 The Apache Software Foundation.
 3  
  *
 4  
  * Licensed under the Apache License, Version 2.0 (the "License")
 5  
  * you may not use this file except in compliance with the License.
 6  
  * You may obtain a copy of the License at
 7  
  *
 8  
  *     http://www.apache.org/licenses/LICENSE-2.0
 9  
  *
 10  
  * Unless required by applicable law or agreed to in writing, software
 11  
  * distributed under the License is distributed on an "AS IS" BASIS,
 12  
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 13  
  * See the License for the specific language governing permissions and
 14  
  * limitations under the License.
 15  
  */
 16  
 
 17  
 package org.apache.commons.configuration.reloading;
 18  
 
 19  
 import org.apache.commons.configuration.FileConfiguration;
 20  
 
 21  
 /**
 22  
  * A reloading strategy that will reload the configuration every time its
 23  
  * underlying file is changed. The file is not reloaded more than once
 24  
  * every 5 seconds by default, this time can be changed by setting the refresh
 25  
  * delay. This strategy only works with FileConfiguration instances.
 26  
  *
 27  
  * @author Emmanuel Bourg
 28  
  * @version $Revision: 155945 $, $Date: 2005-03-02 20:29:39 +0100 (Mi, 02 Mrz 2005) $
 29  
  * @since 1.1
 30  
  */
 31  42
 public class FileChangedReloadingStrategy implements ReloadingStrategy
 32  
 {
 33  9
     protected FileConfiguration configuration;
 34  
 
 35  
     /** The last time the configuration file was modified. */
 36  
     protected long lastModified;
 37  
 
 38  
     /** The last time the file was checked for changes. */
 39  
     protected long lastChecked;
 40  
 
 41  
     /** The minimum delay in milliseconds between checks. */
 42  42
     protected long refreshDelay = 5000;
 43  
 
 44  9
     public void setConfiguration(FileConfiguration configuration)
 45  
     {
 46  28
         this.configuration = configuration;
 47  28
     }
 48  9
 
 49  9
     public void init()
 50  
     {
 51  28
         updateLastModified();
 52  28
     }
 53  9
 
 54  9
     public boolean reloadingRequired()
 55  
     {
 56  84
         boolean reloading = false;
 57  
 
 58  120
         long now = System.currentTimeMillis();
 59  
 
 60  120
         if ((now > lastChecked + refreshDelay) && hasChanged())
 61  
         {
 62  64
             lastChecked = now;
 63  28
             reloading = true;
 64  18
         }
 65  18
 
 66  84
         return reloading;
 67  
     }
 68  36
 
 69  
     public void reloadingPerformed()
 70  
     {
 71  28
         updateLastModified();
 72  28
     }
 73  18
 
 74  18
     /**
 75  
      * Return the minimal time in milliseconds between two reloadings.
 76  
      */
 77  
     public long getRefreshDelay()
 78  
     {
 79  14
         return refreshDelay;
 80  
     }
 81  
 
 82  
     /**
 83  
      * Set the minimal time between two reloadings.
 84  
      *
 85  
      * @param refreshDelay refresh delay in milliseconds
 86  
      */
 87  
     public void setRefreshDelay(long refreshDelay)
 88  
     {
 89  42
         this.refreshDelay = refreshDelay;
 90  42
     }
 91  
 
 92  
     /**
 93  
      * Update the last modified time.
 94  
      */
 95  
     protected void updateLastModified()
 96  
     {
 97  56
         lastModified = configuration.getFile().lastModified();
 98  56
     }
 99  27
 
 100  27
     /**
 101  27
      * Check if the configuration has changed since the last time it was loaded.
 102  
      */
 103  
     protected boolean hasChanged()
 104  
     {
 105  56
         if (!configuration.getFile().exists())
 106  
         {
 107  14
             return false;
 108  
         }
 109  18
 
 110  42
         return (configuration.getFile().lastModified() > lastModified);
 111  
     }
 112  
 
 113  
 }

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