Package org.spongepowered.configurate.reference

Class WatchServiceListener

java.lang.Object

org.spongepowered.configurate.reference.WatchServiceListener

All Implemented Interfaces:

AutoCloseable

public final class WatchServiceListener
extends Object
implements AutoCloseable

A wrapper around NIO's WatchService that uses the provided watch key to poll for changes, and calls listeners once an event occurs.

Some deduplication is performed because Windows can be fairly spammy with its events, so one callback may receive multiple events at one time.

Callback functions are Subscribers that take the WatchEvent as their parameter.

Listening to a directory provides updates on the directory's immediate children, but does not listen recursively.

Since:

4.0.0

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static final class	WatchServiceListener.Builder	Set the parameters needed to create a WatchServiceListener.

Method Summary

Modifier and Type	Method	Description
static WatchServiceListener.Builder	builder()	Returns a new builder for a WatchServiceListener to create a customized listener.
void	close()
static WatchServiceListener	create()	Create a new WatchServiceListener using a new cached thread pool executor and the default filesystem.
<N extends ScopedConfigurationNode<N>> ConfigurationReference<N>	listenToConfiguration(Function<Path,ConfigurationLoader<? extends N>> loaderFunc, Path path)	Create a new ConfigurationReference subscribed to FS updates.
Disposable	listenToDirectory(Path directory, Subscriber<WatchEvent<?>> callback)	Listen to a directory.
Disposable	listenToFile(Path file, Subscriber<WatchEvent<?>> callback)	Listen for changes to a specific file or directory.

Methods inherited from class java.lang.Object

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

Method Details

builder

public static WatchServiceListener.Builder builder()

Returns a new builder for a WatchServiceListener to create a customized listener.

Returns:

a new builder

Since:

4.0.0

create

public static WatchServiceListener create()
                                   throws IOException

Create a new WatchServiceListener using a new cached thread pool executor and the default filesystem.

Returns:

a new instance with default values

Throws:

IOException - if a watch service cannot be created

Since:

4.0.0

See Also:

• for customization

listenToFile

public Disposable listenToFile(Path file,
 Subscriber<WatchEvent<?>> callback)
                        throws ConfigurateException,
IllegalArgumentException

Listen for changes to a specific file or directory.

Parameters:

file - the path of the file or directory to listen for changes on.

callback - a subscriber that will be notified when changes occur.

Returns:

a Disposable that can be used to cancel this subscription

Throws:

ConfigurateException - if a filesystem error occurs.

IllegalArgumentException - if the provided path is a directory.

Since:

4.0.0

listenToDirectory

public Disposable listenToDirectory(Path directory,
 Subscriber<WatchEvent<?>> callback)
                             throws ConfigurateException,
IllegalArgumentException

Listen to a directory. Callbacks will receive events both for the directory and for its contents.

Parameters:

directory - the directory to listen to

callback - a subscriber that will be notified when changes occur.

Returns:

a Disposable that can be used to cancel this subscription

Throws:

ConfigurateException - when an error occurs registering with the underlying watch service.

IllegalArgumentException - if the provided path is not a directory

Since:

4.0.0

listenToConfiguration

public <N extends ScopedConfigurationNode<N>>
ConfigurationReference<N> listenToConfiguration(Function<Path,ConfigurationLoader<? extends N>> loaderFunc,
 Path path)
                                         throws ConfigurateException

Create a new ConfigurationReference subscribed to FS updates.

Type Parameters:

N - node type

Parameters:

loaderFunc - function that will create a new loader

path - path to to for changes

Returns:

new reference

Throws:

ConfigurateException - if unable to complete an initial load of the configuration.

Since:

4.0.0

close

public void close()
           throws IOException

Specified by:

close in interface AutoCloseable

Throws:

IOException