[jira] [Created] (AUTOTAG-21) AbstractModelBody.evaluateAsString uses regular expression to replace the contents of the string. It should be able to use a pre compiled Pattern instead for performance reason

[Gagan Arora (JIRA)]

Gagan Arora created AUTOTAG-21:
----------------------------------

             Summary: AbstractModelBody.evaluateAsString uses regular 
expression to replace the contents  of the string. It should be able to use a 
pre compiled Pattern instead for performance reason
                 Key: AUTOTAG-21
                 URL: https://issues.apache.org/jira/browse/AUTOTAG-21
             Project: Tiles Autotag
          Issue Type: Improvement
    Affects Versions: 1.1.0
            Reporter: Gagan Arora


I am seeing high CPU utilization on AbstractModelBody.evaluateAsString method 
in my thread dumps. 

 java.lang.Thread.State: RUNNABLE
        at java.util.regex.Pattern$BmpCharProperty.match(Pattern.java:3715)
        at java.util.regex.Pattern$Curly.match0(Pattern.java:4158)
        at java.util.regex.Pattern$Curly.match(Pattern.java:4132)
        at java.util.regex.Pattern$Branch.match(Pattern.java:4502)
        at java.util.regex.Pattern$Start.match(Pattern.java:3408)
        at java.util.regex.Matcher.search(Matcher.java:1199)
        at java.util.regex.Matcher.find(Matcher.java:592)
        at 
org.apache.tiles.autotag.core.runtime.AbstractModelBody.evaluateAsString(AbstractModelBody.java:70)
        at 
org.apache.tiles.template.PutAttributeModel.execute(PutAttributeModel.java:96)
        at 
org.apache.tiles.jsp.taglib.PutAttributeTag.doTag(PutAttributeTag.java:226)


What I did 

1. Declared a compiled Pattern

private static Pattern pattern = Pattern.compile("^\\s*|\\s*$");

2. in evaluateAsString :
pattern.matcher(body).replaceAll("");







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