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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