Commons pool implementation of the parser pool
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Key: VELOCITY-434
URL: http://issues.apache.org/jira/browse/VELOCITY-434
Project: Velocity
Type: Improvement
Components: Source
Reporter: Serge Knystautas
Priority: Minor
Now that with [Velocity-433] we can swap out the parser pool, here is a parser
pool that uses commons-pool (http://jakarta.apache.org/commons/pool/).
It is very primitive configuration and uses the same configuration name
(parser.pool.size) for maximum number of elements in the pool. It is also
configured to grow when the maximum number is exhausted, which means that it
scales the same way as the original parser, while actually providing some
better pool support.
One of the nicest parts about this is that you can set your maximum instances
to 0 and still get great performance. The first time you need a parser, it
will still add one even though the max is reached (since grow when exhausted is
set). Assuming the second time you need a parser is within a few seconds, that
first instance is still there.
Here is some sample code of how to use it your app.
Properties configuration = new Properties();
configuration.put("parser.pool.class",
"com.lokitech.util.pool.CommonsParserPool");
configuration.put("parser.pool.size", "0");
Velocity.init(configuration);
Since Velocity does not have an existing dependency on commons pool, I'm not
sure this code will get packaged into the main distribution. This code is
licensed using ASL 2.0, so please reuse however you want as long as attribution
is kept per the license.
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