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https://issues.apache.org/jira/browse/OPENJPA-2220?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13405972#comment-13405972
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Rick Curtis commented on OPENJPA-2220:
--------------------------------------
I committed revision 1356860 to trunk.
This first iteration of this tool is limited in usage. Currently it is not
configurable. Once it is on the classpath, it starts running. When you take it
off the classpath, it stops running. It is also depended upon runtime (ie:
javaagent or container enhancement) enhancement.
I modified a number of things from the original patch to make it more usable...
When the code first gets loaded up you'll see this message[1] so a user is
notified when it is running. Also, when the statistics are dumped you'll see a
message along these lines[2].
I'll also note that I modified the pom to spit out another jar file that allows
this tool to work in a WebSphere environment.
[1] 3094 fetchStatisticPU INFO [main] openjpa.Runtime - The
FetchStatisticsAuxEnhancer has been loaded and is tracking persistent field
usage.
[2] 4226 fetchStatisticPU INFO [Thread-5] openjpa.Runtime - Successfully
collected fetch statistics from Entities
[org.apache.openjpa.enhance.stats.AEntity,...,
org.apache.openjpa.enhance.stats.EEntity]. The following fields are
FetchType.EAGER and were never fetched [ total 10 ] :
org.apache.openjpa.enhance.stats.AEntity.checked
org.apache.openjpa.enhance.stats.AEntity.desc
org.apache.openjpa.enhance.stats.AEntity.extraInfo
org.apache.openjpa.enhance.stats.AEntity.name
...
> Persistent field fetching statistic tool
> ----------------------------------------
>
> Key: OPENJPA-2220
> URL: https://issues.apache.org/jira/browse/OPENJPA-2220
> Project: OpenJPA
> Issue Type: Improvement
> Components: tooling
> Affects Versions: 2.3.0, 2.2.1
> Reporter: Helen Xu
> Assignee: Rick Curtis
> Attachments: OPENJPA-2220Patch.txt, statisticToolDocPatch.txt
>
>
> This task is to create a statistic tool which monitors the persistent fields
> fetching and finds out the fields which are never accessed. Based on the
> statistic data, user can set the field access type to LAZY to improve the
> performance by eliminating the data loading and processing time.
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