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## org.apache.commons.configuration.reloading
Class FileChangedReloadingStrategy

    java.lang.Object
      org.apache.commons.configuration.reloading.FileChangedReloadingStrategy

All Implemented Interfaces:
  ReloadingStrategy

    public class FileChangedReloadingStrategy

extends Object
implements ReloadingStrategy

A reloading strategy that will reload the configuration every time its underlying file is changed.

This reloading strategy does not actively monitor a configuration file, but is triggered by its associated configuration whenever properties are accessed. It then checks the configuration file's last modification date and causes a reload if this has changed.

To avoid permanent disc access on successive property lookups a refresh delay can be specified. This has the effect that the configuration file's last modification date is only checked once in this delay period. The default value for this refresh delay is 5 seconds.

This strategy only works with FileConfiguration instances.

Since:
  1.1
Version:
  $Id: FileChangedReloadingStrategy.java 1210646 2011-12-05 21:25:01Z oheger $
Author:
  Emmanuel Bourg

Field Summary
`protected FileConfiguration` | `configuration` Stores a reference to the configuration to be monitored.
`protected long` | `lastChecked` The last time the file was checked for changes.
`protected long` | `lastModified` The last time the configuration file was modified.
`protected long` | `refreshDelay` The minimum delay in milliseconds between checks.

Constructor Summary
`FileChangedReloadingStrategy()`

Method Summary
`protected File` | `getFile()` Returns the file that is monitored by this strategy.
`long` | `getRefreshDelay()` Return the minimal time in milliseconds between two reloadings.
`protected boolean` | `hasChanged()` Check if the configuration has changed since the last time it was loaded.
`void` | `init()` Initialize the strategy.
`void` | `reloadingPerformed()` Notify the strategy that the file has been reloaded.
`boolean` | `reloadingRequired()` Tell if the evaluation of the strategy requires to reload the configuration.
`void` | `setConfiguration(FileConfiguration configuration)` Set the configuration managed by this strategy.
`void` | `setRefreshDelay(long refreshDelay)` Set the minimal time between two reloadings.
`protected void` | `updateLastModified()` Update the last modified time.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### configuration

    protected FileConfiguration configuration

  Stores a reference to the configuration to be monitored.

### lastModified

    protected long lastModified

  The last time the configuration file was modified.

### lastChecked

    protected long lastChecked

  The last time the file was checked for changes.

### refreshDelay

    protected long refreshDelay

  The minimum delay in milliseconds between checks.

Constructor Detail

### FileChangedReloadingStrategy

    public FileChangedReloadingStrategy()

Method Detail

### setConfiguration

    public void setConfiguration(FileConfiguration configuration)

  Description copied from interface: `ReloadingStrategy`
  Set the configuration managed by this strategy.

  Specified by:
    `setConfiguration` in interface `ReloadingStrategy`
  Parameters:
    `configuration` - the configuration to monitor

### init

    public void init()

  Description copied from interface: `ReloadingStrategy`
  Initialize the strategy.

  Specified by:
    `init` in interface `ReloadingStrategy`

### reloadingRequired

    public boolean reloadingRequired()

  Description copied from interface: `ReloadingStrategy`
  Tell if the evaluation of the strategy requires to reload the configuration.

  Specified by:
    `reloadingRequired` in interface `ReloadingStrategy`
  Returns:
    a flag whether a reload should be performed

### reloadingPerformed

    public void reloadingPerformed()

  Description copied from interface: `ReloadingStrategy`
  Notify the strategy that the file has been reloaded.

  Specified by:
    `reloadingPerformed` in interface `ReloadingStrategy`

### getRefreshDelay

    public long getRefreshDelay()

  Return the minimal time in milliseconds between two reloadings.

  Returns:
    the refresh delay (in milliseconds)

### setRefreshDelay

    public void setRefreshDelay(long refreshDelay)

  Set the minimal time between two reloadings.

  Parameters:
    `refreshDelay` - refresh delay in milliseconds

### updateLastModified

    protected void updateLastModified()

  Update the last modified time.

### hasChanged

    protected boolean hasChanged()

  Check if the configuration has changed since the last time it was loaded.

  Returns:
    a flag whether the configuration has changed

### getFile

    protected File getFile()

  Returns the file that is monitored by this strategy. Note that the return value can be null under some circumstances.

  Returns:
    the monitored file

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