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Question 29/150
An application is waiting for notification of changes to a tmp directory using the following code statements:
Path dir = Paths.get("tmp")
WatchKey key = dir.register (watcher, ENTRY_CREATE, ENTRY_DELETE, ENTRY_MODIFY) ;
In the tmp directory, the user renames the file testA to testB,
Which statement is true?
Path dir = Paths.get("tmp")
WatchKey key = dir.register (watcher, ENTRY_CREATE, ENTRY_DELETE, ENTRY_MODIFY) ;
In the tmp directory, the user renames the file testA to testB,
Which statement is true?
Correct Answer: A
Explanation/Reference:
Explanation:
Most file system implementations have native support for file change notification. The WatchService API
takes advantage of this support where available.
However, when a file system does not support this mechanism, the WatchService will poll the file system,
waiting for events.
Note:
WatchKey : When a Watchable entity is registered with a WatchService a key which is a WatchKey is
generated. Initially the key is in ready state waiting to be notified of any events on the Watchable entity.
Once an event occurs the key goes into signaled state and allows to access the events using its pollEvents
method.
After processing the poll events the key has to be reset by invoking its reset method.
Reference: The Java Tutorials,Watching a Directory for Changes
Explanation:
Most file system implementations have native support for file change notification. The WatchService API
takes advantage of this support where available.
However, when a file system does not support this mechanism, the WatchService will poll the file system,
waiting for events.
Note:
WatchKey : When a Watchable entity is registered with a WatchService a key which is a WatchKey is
generated. Initially the key is in ready state waiting to be notified of any events on the Watchable entity.
Once an event occurs the key goes into signaled state and allows to access the events using its pollEvents
method.
After processing the poll events the key has to be reset by invoking its reset method.
Reference: The Java Tutorials,Watching a Directory for Changes
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