Package org.elasticsearch.watcher

Class FileWatcher

java.lang.Object

org.elasticsearch.watcher.AbstractResourceWatcher<FileChangesListener>

org.elasticsearch.watcher.FileWatcher

All Implemented Interfaces:

ResourceWatcher

public class FileWatcher
extends AbstractResourceWatcher<FileChangesListener>

File resources watcher The file watcher checks directory and all its subdirectories for file changes and notifies its listeners accordingly

Constructor Summary

Constructors

Constructor	Description
FileWatcher(Path path)	Creates new file watcher on the given directory
FileWatcher(Path path, boolean checkFileContents)	Creates new file watcher on the given directory

Method Summary

Modifier and Type	Method	Description
void	clearState()	Clears any state with the FileWatcher, making all files show up as new
protected void	doCheckAndNotify()	Will be called periodically
protected void	doInit()	Will be called once on initialization

Methods inherited from class org.elasticsearch.watcher.AbstractResourceWatcher

addListener, checkAndNotify, init, listeners, remove

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

FileWatcher

public FileWatcher(Path path)

Creates new file watcher on the given directory

Parameters:

path - the directory to watch

FileWatcher

public FileWatcher(Path path,
 boolean checkFileContents)

Creates new file watcher on the given directory

Parameters:

path - the directory to watch

checkFileContents - whether to inspect the content of the file for changes (via a message digest) - this is a "best efforts" check and will err on the side of sending extra change notifications if the file might have changed.

Method Details

clearState

public void clearState()

Clears any state with the FileWatcher, making all files show up as new

doInit

protected void doInit()
               throws IOException

Description copied from class: AbstractResourceWatcher

Will be called once on initialization

Specified by:

doInit in class AbstractResourceWatcher<FileChangesListener>

Throws:

IOException

doCheckAndNotify

protected void doCheckAndNotify()
                         throws IOException

Description copied from class: AbstractResourceWatcher

Will be called periodically

Implementing watcher should check resource and notify all AbstractResourceWatcher.listeners().

Specified by:

doCheckAndNotify in class AbstractResourceWatcher<FileChangesListener>

Throws:

IOException