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https://issues.apache.org/jira/browse/DERBY-6733?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Knut Anders Hatlen updated DERBY-6733:
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Attachment: d6733-2a-statement-cache.diff
[^d6733-2a-statement-cache.diff] adds an MBean that allow users to monitor the
statement cache.
While writing tests for it, I realized that the previous patch had confused the
AllocatedEntries attribute and the UsedEntries attribute. AllocatedEntries
actually returned what UsedEntries was supposed to return, and, because of
that, UsedEntries accounted the free entries twice and therefore gave a too low
number. The patch also fixes this problem.
It makes the following changes:
*impl/sql/conn/GenericLanguageConnectionFactory.java*: register the statement
cache MBean in boot() and deregister it in stop()
*iapi/services/cache/CacheManager.java*: add a method for deregistering the
MBean at shutdown, used by GenericLanguageConnectionFactory.stop()
*iapi/store/raw/data/DataFactory.java,
impl/store/raw/data/BaseDataFileFactory.java*: expose the getRootDirectory()
method to allow GenericLanguageConnectionFactory.boot() to set the db name
property of the MBean
*impl/services/cache/ReplacementPolicy.java,
impl/services/cache/ClockPolicy.java*: expose the size of the clock data
structure
*impl/services/cache/ConcurrentCache.java*: add method to deregister the MBean,
and adjust previously incorrect calculations of AllocatedEntries and UsedEntries
*tests/management/CacheManagerMBeanTest.java*: add functional tests for the
statement cache MBean
All regression tests ran cleanly with the patch.
> Implement an MBean for monitoring caches
> ----------------------------------------
>
> Key: DERBY-6733
> URL: https://issues.apache.org/jira/browse/DERBY-6733
> Project: Derby
> Issue Type: Improvement
> Components: JMX
> Affects Versions: 10.12.0.0
> Reporter: Knut Anders Hatlen
> Assignee: Knut Anders Hatlen
> Attachments: d6733-1a-page-and-container.diff,
> d6733-2a-statement-cache.diff
>
>
> Add an MBean that allows users to monitor Derby's CacheFactory instances, as
> discussed in DERBY-5772.
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