java.lang.Object
- org.springframework.boot.devtools.filewatch.FileSystemWatcher

```
public class FileSystemWatcher
extends Object
```
Watches specific folders for file changes.
Since:
1.3.0
See Also:
FileChangeListener

Constructor Summary

Constructors
Constructor	Description
`FileSystemWatcher()`	Create a new `FileSystemWatcher` instance.
`FileSystemWatcher(boolean daemon, Duration pollInterval, Duration quietPeriod)`	Create a new `FileSystemWatcher` instance.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`addListener(FileChangeListener fileChangeListener)`	Add listener for file change events.
`void`	`addSourceFolder(File folder)`	Add a source folder to monitor.
`void`	`addSourceFolders(Iterable<File> folders)`	Add source folders to monitor.
`void`	`setTriggerFilter(FileFilter triggerFilter)`	Set an optional `FileFilter` used to limit the files that trigger a change.
`void`	`start()`	Start monitoring the source folder for changes.
`void`	`stop()`	Stop monitoring the source folders.

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

- Constructor Detail
  - FileSystemWatcher
```
public FileSystemWatcher()
```
    Create a new FileSystemWatcher instance.
  - FileSystemWatcher
```
public FileSystemWatcher(boolean daemon,
                         Duration pollInterval,
                         Duration quietPeriod)
```
    Create a new FileSystemWatcher instance.
    Parameters:
    daemon - if a daemon thread used to monitor changes
    pollInterval - the amount of time to wait between checking for changes
    quietPeriod - the amount of time required after a change has been detected to ensure that updates have completed
- Method Detail
  - addListener
```
public void addListener(FileChangeListener fileChangeListener)
```
    Add listener for file change events. Cannot be called after the watcher has been started.
    Parameters:
    fileChangeListener - the listener to add
  - addSourceFolders
```
public void addSourceFolders(Iterable<File> folders)
```
    Add source folders to monitor. Cannot be called after the watcher has been started.
    Parameters:
    folders - the folders to monitor
  - addSourceFolder
```
public void addSourceFolder(File folder)
```
    Add a source folder to monitor. Cannot be called after the watcher has been started.
    Parameters:
    folder - the folder to monitor
  - setTriggerFilter
```
public void setTriggerFilter(FileFilter triggerFilter)
```
    Set an optional FileFilter used to limit the files that trigger a change.
    Parameters:
    triggerFilter - a trigger filter or null
  - start
```
public void start()
```
    Start monitoring the source folder for changes.
  - stop
```
public void stop()
```
    Stop monitoring the source folders.

Class FileSystemWatcher

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

FileSystemWatcher

FileSystemWatcher

Method Detail

addListener

addSourceFolders

addSourceFolder

setTriggerFilter

start

stop