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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