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https://issues.apache.org/jira/browse/GROOVY-11650?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17949586#comment-17949586
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Paul King commented on GROOVY-11650:
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The iterator ordering is known behaviour for various queue classes and is
mentioned in their Javadocs. I think it is cleaner to have a new method,
otherwise Java code and Groovy code will behave differently and some folks
might be relying on that behaviour, and might request a method to get the old
behaviour back. I was more trying to make it convenient to use queues in their
current form than to try to fix the arguably slightly klunky design.
> Create drain extension method for Queues
> ----------------------------------------
>
> Key: GROOVY-11650
> URL: https://issues.apache.org/jira/browse/GROOVY-11650
> Project: Groovy
> Issue Type: New Feature
> Reporter: Paul King
> Assignee: Paul King
> Priority: Major
> Fix For: 5.x
>
>
> The standard iterator for queues like PriorityQueue don't iterate according
> to priority order. You have to use poll (or drainTo for blocking queues) to
> get the elements in priority order. It would be useful to have a "drain()" or
> "elements()" method to get a list of all the elements that successive calls
> to poll would return. The intention would be that the queue was drained upon
> completion of the call.
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