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From "Seth Weiner (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HTTPCORE-311) Retrieval of primitive connection pool stat values
Date Wed, 19 Sep 2012 19:41:07 GMT

     [ https://issues.apache.org/jira/browse/HTTPCORE-311?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Seth Weiner updated HTTPCORE-311:
---------------------------------

    Attachment: httpcomponents-monitoring-patch3.diff

Joe raised a good point that using an AtomicInteger is overkill. Simply using volatile ints
should be safe here since we're just using 32 bit numbers. This patch is updated accordingly.
                
> Retrieval of primitive connection pool stat values
> --------------------------------------------------
>
>                 Key: HTTPCORE-311
>                 URL: https://issues.apache.org/jira/browse/HTTPCORE-311
>             Project: HttpComponents HttpCore
>          Issue Type: New Feature
>          Components: HttpCore
>    Affects Versions: 4.2.1
>            Reporter: Seth Weiner
>         Attachments: httpcomponents-monitoring-patch2.diff, httpcomponents-monitoring-patch3.diff,
httpcomponents-monitoring-patch.diff, PollingPrimitivePoolControl.java, PollingPrimitivePoolControlTest.java,
PrimitiveConnPoolControl.java
>
>
> The org.apache.http.pool.ConnPoolControl interface exposes valuable runtime metrics for
a connection pool's individual routes and global values. However, it uses a bean class, org.apache.http.pool.PoolStats,
to exposes the global values. This is problematic when trying to monitor these connection
pool values at runtime since PoolStats is not Serializable and many jmx monitoring agents
only support primitive values well. The value of the PoolStats class seems to be in trying
to minimize the amount of locking of the pool required to get stats.
> The attached patch includes an interface that extends ConnPoolControl to add four methods
to return the primitive value for global pool stats. There's an implementation of this interface
that will delegate all of the ConnPoolControl methods to a delegate instance, and support
retrieving the primitive global values by periodically retrieving and caching a PoolStats
instance internally. This minimizes the amount of locking required while also making it easy
to monitor these values.
> It would probably be ideal to incorporate this functionality directly into the existing
ConnPoolControl interface, but the attached code provides a non-invasive way to achieve the
desired effect.

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