[jboss-jira] [JBoss JIRA] Commented: (JGRP-1051) TimeScheduler: replace use of ScheduledThreadPoolExecutor with ConcurrentSkipListMap

[Brian Stansberry (JIRA)]

    [ https://jira.jboss.org/jira/browse/JGRP-1051?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12492211#action_12492211 ] 

Brian Stansberry commented on JGRP-1051:
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FYI, Trustin Lee has an implementation of a Hashed Timer Wheel in Netty.

> TimeScheduler: replace use of ScheduledThreadPoolExecutor with ConcurrentSkipListMap
> ------------------------------------------------------------------------------------
>
>                 Key: JGRP-1051
>                 URL: https://jira.jboss.org/jira/browse/JGRP-1051
>             Project: JGroups
>          Issue Type: Feature Request
>            Reporter: Bela Ban
>            Assignee: Bela Ban
>             Fix For: 2.9
>
>         Attachments: timer.zip, TimeScheduler.java, TimeScheduler.patch
>
>
> TimeScheduler currently extends ScheduledThreadPoolExecutor, which uses a DelayQueue for keeping an ordered list of tasks (ordered by their execution times).
> DelayQueue doesn't provide good speed, e.g. (IIRC) remove() requires a linear list scan.
> ConcurrentSkipListMap however provides O(log(n)) cost for get(), put(), remove() and containsKey(). Attached is a cursory impl of TimeScheduler based on ConcurrentSkipListMap. It is faster than the old version.
> Since ConcurrentSkipListMap requires JDK 1.6, we cannot use this in 2.6.x. It can be used in 3.0 only, or perhaps - after a discussion on the mailing list - in 2.9...

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