wicket.util.concurrent

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Java Source Code / Java Documentation » J2EE » wicket » wicket.util.concurrent 
wicket.util.concurrent
wicket.util.concurrent package

Contains the classes for concurrency support.

This package provides standardized, efficient versions of utility classes commonly encountered in concurrent Java programming. This code consists of implementations of ideas that have been around for ages, and is merely intended to save you the trouble of coding them. Discussions of the rationale and applications of several of these classes can be found in the second edition of Concurrent Programming in Java. There are also pdf slides providing an overview of the package.

These classes were taken from concurrent.jar, version 1.3.4, provided by Doug Lea. Java 1.5 and later have these collections built in.

Java Source File NameTypeComment
ConcurrentHashMap.javaClass A version of Hashtable supporting concurrency for both retrievals and updates:
Retrievals
Retrievals may overlap updates.
ConcurrentReaderHashMap.javaClass A version of Hashtable that supports mostly-concurrent reading, but exclusive writing.
CopyOnWriteArrayList.javaClass This class implements a variant of java.util.ArrayList in which all mutative operations (add, set, and so on) are implemented by making a fresh copy of the underlying array.

This is ordinarily too costly, but it becomes attractive when traversal operations vastly overwhelm mutations, and, especially, when you cannot or don't want to synchronize traversals, yet need to preclude interference among concurrent threads.

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