Struts 2
  1. Struts 2
  2. WW-3750

ScopesHashModel calls OgnlValueStack.findValue too many times during rendering freemarker templates


    • Type: Improvement Improvement
    • Status: Closed
    • Priority: Minor Minor
    • Resolution: Fixed
    • Affects Version/s:
    • Fix Version/s: 2.3.3
    • Component/s: Value Stack
    • Labels:
    • Flags:


      I saw using a profiler, that OgnlValueStack.findValue(String) gets called about a thousand times during rendering a page. Most of the calls are coming from ScopesHashModel.
      All freemarker templates contain a lot of references to e.g. "parameters". This variable is evaluated in ScopesHashModel over and over again, which takes about 10% time of total page load.
      I think we can assume, that the top-level objects on the value stack will not change during rendering a single struts2 tag. So with a little caching, we can eliminate most of the findValue method calls.

      In my application I tested this modification and didn't notice any side effects or bugs. The OgnlValueStack.findValue(String) calls on a test page went down from a thousand to a hundred. This improved overall page rendering time from about 400ms to 360ms.

      Patch is attached.
      Please review it.

      1. WW-3750-parameters.diff
        2 kB
        Pelladi Gabor
      2. WW-3750-2.diff
        2 kB
        Pelladi Gabor
      3. WW-3750.diff
        1 kB
        Pelladi Gabor

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            • Assignee:
              Johannes Geppert
              Pelladi Gabor
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