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From "Seth Weiner (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HTTPCORE-311) Retrieval of primitive connection pool stat values
Date Fri, 14 Sep 2012 21:04:07 GMT
Seth Weiner created HTTPCORE-311:
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             Summary: 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: 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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