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## 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:
  Commons IO 2.0
Version:
  $Id: FileAlterationMonitor.java 1022799 2010-10-15 00:56:13Z niallp $
See Also:
  `FileAlterationObserver`

Constructor Summary
`FileAlterationMonitor()` Construct a monitor with a default interval of 10 seconds.
`FileAlterationMonitor(long interval)` Construct a monitor with the specified interval.
`FileAlterationMonitor(long interval, FileAlterationObserver... observers)` Construct a monitor with the specified interval and set of observers.

Method Summary
`void` | `addObserver(FileAlterationObserver observer)` Add a file system observer to this monitor.
`long` | `getInterval()` Return the interval.
`Iterable<FileAlterationObserver>` | `getObservers()` Returns the set of `FileAlterationObserver` registered with this monitor.
`void` | `removeObserver(FileAlterationObserver observer)` Remove a file system observer from this monitor.
`void` | `run()` Run.
`void` | `start()` Start monitoring.
`void` | `stop()` Stop monitoring.

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

Constructor Detail

### FileAlterationMonitor

    public FileAlterationMonitor()

  Construct a monitor with a default interval of 10 seconds.

### FileAlterationMonitor

    public FileAlterationMonitor(long interval)

  Construct a monitor with the specified interval.

  Parameters:
    `interval` - The amount of time in miliseconds to wait between checks of the file system

### FileAlterationMonitor

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

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

  Parameters:
    `interval` - The amount of time in miliseconds to wait between checks of the file system
    `observers` - The set of observers to add to the monitor.

Method Detail

### getInterval

    public long getInterval()

  Return the interval.

  Returns:
    the interval

### addObserver

    public void addObserver(FileAlterationObserver observer)

  Add a file system observer to this monitor.

  Parameters:
    `observer` - The file system observer to add

### removeObserver

    public void removeObserver(FileAlterationObserver observer)

  Remove a file system observer from this monitor.

  Parameters:
    `observer` - The file system observer to remove

### getObservers

    public Iterable<FileAlterationObserver> getObservers()

  Returns the set of `FileAlterationObserver` registered with this monitor.

  Returns:
    The set of `FileAlterationObserver`

### start

    public void start()
               throws Exception

  Start monitoring.

  Throws:
    `Exception` - if an error occurs initializing the observer

### stop

    public void stop()
              throws Exception

  Stop monitoring.

  Throws:
    `Exception` - if an error occurs initializing the observer

### run

    public void run()

  Run.

  Specified by:
    `run` in interface `Runnable`

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