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From "Oliver Heger (JIRA)" <j...@apache.org>
Subject [jira] Created: (LANG-609) Support lazy initialization using atomic variables
Date Tue, 16 Mar 2010 21:32:27 GMT
Support lazy initialization using atomic variables
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                 Key: LANG-609
                 URL: https://issues.apache.org/jira/browse/LANG-609
             Project: Commons Lang
          Issue Type: New Feature
          Components: lang.concurrent.*
            Reporter: Oliver Heger
            Priority: Minor


In the new concurrent package there is already the {{LazyInitializer}} class implementing
the double-check idiom for lazy initialization of instance fields. Another way to perform
initialization lazily would be the usage of atomic variables. This solution would not need
synchronization at all. If there is low contention (not many threads in parallel), it is more
efficient than synchronized access. Its drawback is that the initialization may be done multiple
times if multiple threads access the initializer almost at the same time (however, it can
be guaranteed that always the same object created by the initializer is returned).

This is a proposal to add an {{AtomicInitializer}} class as an alternative to {{LazyInitializer}}
that operates on {{AtomicReference}} variables.

In order to make the initializers smoothly exchangable, it would make sense for them to share
a common interface. This interface could also be implemented by the {{BackgroundInitializer}}
class.

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