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From "Timothy Bish (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (AMQ-2932) A little optimization to IdGenerator and a potential issue with the counter
Date Thu, 23 Sep 2010 22:25:40 GMT

     [ https://issues.apache.org/activemq/browse/AMQ-2932?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Timothy Bish resolved AMQ-2932.
-------------------------------

    Fix Version/s: 5.5.0
       Resolution: Fixed

Applied your change to the trunk IdGenerator.  Nice catch.

> A little optimization to IdGenerator and a potential issue with the counter
> ---------------------------------------------------------------------------
>
>                 Key: AMQ-2932
>                 URL: https://issues.apache.org/activemq/browse/AMQ-2932
>             Project: ActiveMQ
>          Issue Type: Improvement
>          Components: Broker
>    Affects Versions: 5.4.1
>            Reporter: Claus Ibsen
>            Priority: Minor
>             Fix For: 5.5.0
>
>
> At Apache Camel we have a copy of the ActiveMQ IdGenerator
> Camel generator is here
> https://svn.apache.org/repos/asf/camel/trunk/camel-core/src/main/java/org/apache/camel/impl/ActiveMQUuidGenerator.java
> ActiveMQ generator is here
> https://svn.apache.org/repos/asf/activemq/trunk/activemq-core/src/main/java/org/apache/activemq/util/IdGenerator.java
> During some work to introduce pluggable id generators in Camel I did look at the source
a bit more.
> 1) sequence counter
> The sequence counter is a long primitive which uses ++ to increment. Its actually not
guaranteed to be an atomic operation across all JVMs and OSs.
> Solution: Use a AtomicLong
> 2) Optimize generateUuid() method
> The generator method concat strings using +
> I did some testing on my laptop and by using StringBuilder I could get it to be slightly
faster. And I computed the max size the generated id could be so the string builder has allocated
the space on start.
> Solution: Use StringBuilder
> See the Camel source code for example.

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