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User input: Queues and Delayed Processing

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Scott Delap

Posts: 1154
Nickname: scottdelap
Registered: Sep, 2004

Client / Server application developer.
User input: Queues and Delayed Processing Posted: Oct 20, 2004 12:29 PM
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This post originated from an RSS feed registered with Java Buzz by Scott Delap.
Original Post: User input: Queues and Delayed Processing
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Feed Description: Client/Desktop Related Java Development 		Latest Java Buzz Posts
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I've ran across a number of cases that I've needed to delay mouse or keyboard input. For instance a user presses the down arrow while in a list repeatedly. Most times I do not want to fire an event for every list selection change. I do want to fire an event when the finally stop on a selection. Well it looks like there are new ways to handle this in JDK 5.0. There is now a new Queue interface that adds the following methods over collection

  • E element()
  • boolean offer(E o)
  • E peek()
  • E poll()
  • E remove()
There are a number of implementions including one called DelayQueue. The offer method can fail on some condition. An example would be that you are already processing input since the queue size is one. The poll and peek methods also fail by returning null instead of throwing exceptions. This would allow you to periodically check the queue for values without exceptions being thrown everywhere. Check out the full article on java.sun.com.

Queues and Delayed Processing

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