[jboss-jira] [JBoss JIRA] Created: (BPEL-313) Prepare jBPM-BPEL for performance-enhancing laziness changes in upcoming Jaxen-1.1.3

Fri Oct 23 18:37:06 EDT 2009

Prepare jBPM-BPEL for performance-enhancing laziness changes in upcoming Jaxen-1.1.3
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                 Key: BPEL-313
                 URL: https://jira.jboss.org/jira/browse/BPEL-313
             Project: jBPM BPEL
          Issue Type: Patch
      Security Level: Public (Everyone can see)
          Components: Engine
            Reporter: Aleksander Adamowski
            Assignee: Alejandro Guizar
            Priority: Minor

There's a change coming up in Jaxen that has the potential to significantly increase its performance by making returned lists lazy:
http://jira.codehaus.org/browse/JAXEN-31

However, to take advantage of this performance-enhancing laziness, one has to employ special techniques when using Jaxen's APIs - most notably, avoid calling size() on Jaxen-returned node lists or sorting them - where possible, using isEmpty(),  iterators, and get().

I'm doing proof of concept work on jBPM-BPEL sources right now. The progress can be tracked on GitHub in the jbpm-bpel project on the perf-jaxen-laziness branch:
http://github.com/aadamowski/jbpm-bpel/commits/perf-jaxen-laziness

Over there there's currently an untested commit there that demonstrates the aforementioned techniques:
http://github.com/aadamowski/jbpm-bpel/commit/6feb2d1a0434e73e47f57e2151bbfcb59d7283c5

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