Path
public interface Watchable
This interface defines the register
method to register the object with a WatchService
returning a WatchKey
to represent the registration. An object may be registered with more than one watch service. Registration with a watch service is cancelled by invoking the key's cancel
method.
Modifier and Type | Method | Description |
---|---|---|
WatchKey |
register |
Registers an object with a watch service. |
WatchKey |
register |
Registers an object with a watch service. |
WatchKey register(WatchService watcher, WatchEvent.Kind<?>[] events, WatchEvent.Modifier... modifiers) throws IOException
If the file system object identified by this object is currently registered with the watch service then the watch key, representing that registration, is returned after changing the event set or modifiers to those specified by the events
and modifiers
parameters. Changing the event set does not cause pending events for the object to be discarded. Objects are automatically registered for the OVERFLOW
event. This event is not required to be present in the array of events.
Otherwise the file system object has not yet been registered with the given watch service, so it is registered and the resulting new key is returned.
Implementations of this interface should specify the events they support.
watcher
- the watch service to which this object is to be registeredevents
- the events for which this object should be registeredmodifiers
- the modifiers, if any, that modify how the object is registeredUnsupportedOperationException
- if unsupported events or modifiers are specifiedIllegalArgumentException
- if an invalid of combination of events are modifiers are specifiedClosedWatchServiceException
- if the watch service is closedIOException
- if an I/O error occursSecurityException
- if a security manager is installed and it denies an unspecified permission required to monitor this object. Implementations of this interface should specify the permission checks.WatchKey register(WatchService watcher, WatchEvent.Kind<?>... events) throws IOException
An invocation of this method behaves in exactly the same way as the invocation
register
.watcher, events, new WatchEvent.Modifier[0]);
watcher
- the watch service to which this object is to be registeredevents
- the events for which this object should be registeredUnsupportedOperationException
- if unsupported events are specifiedIllegalArgumentException
- if an invalid of combination of events are specifiedClosedWatchServiceException
- if the watch service is closedIOException
- if an I/O error occursSecurityException
- if a security manager is installed and it denies an unspecified permission required to monitor this object. Implementations of this interface should specify the permission checks.
© 1993, 2023, Oracle and/or its affiliates. All rights reserved.
Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
Various third party code in OpenJDK is licensed under different licenses (see Debian package).
Java and OpenJDK are trademarks or registered trademarks of Oracle and/or its affiliates.
https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/nio/file/Watchable.html