Package org.apache.commons.io.monitor

Class FileAlterationMonitor

java.lang.Object

org.apache.commons.io.monitor.FileAlterationMonitor

All Implemented Interfaces:

Runnable

public final class FileAlterationMonitor
extends Object
implements Runnable

A runnable that spawns a monitoring thread triggering any registered FileAlterationObserver at a specified interval.

Since:

2.0

See Also:

• FileAlterationObserver

Constructor Summary

Constructors

Constructor	Description
FileAlterationMonitor()	Constructs a monitor with a default interval of 10 seconds.
FileAlterationMonitor(long intervalMillis)	Constructs a monitor with the specified interval.
FileAlterationMonitor(long interval, Collection<FileAlterationObserver> observers)	Constructs a monitor with the specified interval and collection of observers.
FileAlterationMonitor(long interval, FileAlterationObserver... observers)	Constructs a monitor with the specified interval and set of observers.

Method Summary

Modifier and Type	Method	Description
void	addObserver(FileAlterationObserver observer)	Adds a file system observer to this monitor.
long	getInterval()	Returns the interval.
Iterable<FileAlterationObserver>	getObservers()	Returns the set of FileAlterationObserver registered with this monitor.
void	removeObserver(FileAlterationObserver observer)	Removes a file system observer from this monitor.
void	run()	Runs this monitor.
void	setThreadFactory(ThreadFactory threadFactory)	Sets the thread factory.
void	start()	Starts monitoring.
void	stop()	Stops monitoring.
void	stop(long stopInterval)	Stops monitoring.

Methods inherited from class java.lang.Object

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

Constructor Details

FileAlterationMonitor

public FileAlterationMonitor()

Constructs a monitor with a default interval of 10 seconds.

FileAlterationMonitor

public FileAlterationMonitor(long intervalMillis)

Constructs a monitor with the specified interval.

Parameters:

intervalMillis - The amount of time in milliseconds to wait between checks of the file system.

FileAlterationMonitor

public FileAlterationMonitor(long interval,
 Collection<FileAlterationObserver> observers)

Constructs a monitor with the specified interval and collection of observers.

Parameters:

interval - The amount of time in milliseconds to wait between checks of the file system.

observers - The collection of observers to add to the monitor.

Since:

2.9.0

FileAlterationMonitor

public FileAlterationMonitor(long interval,
 FileAlterationObserver... observers)

Constructs a monitor with the specified interval and set of observers.

Parameters:

interval - The amount of time in milliseconds to wait between checks of the file system.

observers - The set of observers to add to the monitor.

Method Details

addObserver

public void addObserver(FileAlterationObserver observer)

Adds a file system observer to this monitor.

Parameters:

observer - The file system observer to add

getInterval

public long getInterval()

Returns the interval.

Returns:

the interval

getObservers

public Iterable<FileAlterationObserver> getObservers()

Returns the set of FileAlterationObserver registered with this monitor.

Returns:

The set of FileAlterationObserver

removeObserver

public void removeObserver(FileAlterationObserver observer)

Removes a file system observer from this monitor.

Parameters:

observer - The file system observer to remove

run

public void run()

Runs this monitor.

Specified by:

run in interface Runnable

setThreadFactory

public void setThreadFactory(ThreadFactory threadFactory)

Sets the thread factory.

Parameters:

threadFactory - the thread factory

start

public void start()
           throws Exception

Starts monitoring.

Throws:

Exception - if an error occurs initializing the observer

stop

public void stop()
          throws Exception

Stops monitoring.

Throws:

Exception - if an error occurs initializing the observer

stop

public void stop(long stopInterval)
          throws Exception

Stops monitoring.

Parameters:

stopInterval - the amount of time in milliseconds to wait for the thread to finish. A value of zero will wait until the thread is finished (see Thread.join(long)).

Throws:

Exception - if an error occurs initializing the observer

Since:

2.1