Java Doc for FileChangedReloadingStrategy.java in  » Library » Apache-commons-configuration-1.4-src » org » apache » commons » configuration » reloading » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Library » Apache commons configuration 1.4 src » org.apache.commons.configuration.reloading 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


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

All known Subclasses:   org.apache.commons.configuration.reloading.FileAlwaysReloadingStrategy,
FileChangedReloadingStrategy
public class FileChangedReloadingStrategy implements ReloadingStrategy(Code)

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.


author:
   Emmanuel Bourg
version:
   $Revision: 439648 $, $Date: 2006-09-02 22:42:10 +0200 (Sa, 02 Sep 2006) $
since:
   1.1


Field Summary
protected  FileConfigurationconfiguration
     Stores a reference to the configuration to be monitored.
protected  longlastChecked
     The last time the file was checked for changes.
protected  longlastModified
     The last time the configuration file was modified.
protected  longrefreshDelay
     The minimum delay in milliseconds between checks.


Method Summary
protected  FilegetFile()
     Returns the file that is monitored by this strategy.
public  longgetRefreshDelay()
     Return the minimal time in milliseconds between two reloadings.
protected  booleanhasChanged()
     Check if the configuration has changed since the last time it was loaded.
public  voidinit()
    
public  voidreloadingPerformed()
    
public  booleanreloadingRequired()
    
public  voidsetConfiguration(FileConfiguration configuration)
    
public  voidsetRefreshDelay(long refreshDelay)
     Set the minimal time between two reloadings.
protected  voidupdateLastModified()
     Update the last modified time.

Field Detail
configuration
protected FileConfiguration configuration(Code)
Stores a reference to the configuration to be monitored.



lastChecked
protected long lastChecked(Code)
The last time the file was checked for changes.



lastModified
protected long lastModified(Code)
The last time the configuration file was modified.



refreshDelay
protected long refreshDelay(Code)
The minimum delay in milliseconds between checks.





Method Detail
getFile
protected File getFile()(Code)
Returns the file that is monitored by this strategy. Note that the return value can be null under some circumstances. the monitored file



getRefreshDelay
public long getRefreshDelay()(Code)
Return the minimal time in milliseconds between two reloadings. the refresh delay (in milliseconds)



hasChanged
protected boolean hasChanged()(Code)
Check if the configuration has changed since the last time it was loaded. a flag whether the configuration has changed



init
public void init()(Code)



reloadingPerformed
public void reloadingPerformed()(Code)



reloadingRequired
public boolean reloadingRequired()(Code)



setConfiguration
public void setConfiguration(FileConfiguration configuration)(Code)



setRefreshDelay
public void setRefreshDelay(long refreshDelay)(Code)
Set the minimal time between two reloadings.
Parameters:
  refreshDelay - refresh delay in milliseconds



updateLastModified
protected void updateLastModified()(Code)
Update the last modified time.



Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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