[JEXL-54] Light performance enhancements

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.1
• Fix Version/s: 2.0
• Assignee: Unassigned
• Reporter: Henri Biestro
• Created: 07/May/09 11:28
• Updated: 02/May/23 17:31
• Resolved: 13/Jun/09 17:47

Description

The ClassMap.MethodCache uses String as key to methods; these keys are forged by concatenating the name of the method & the argument classes names (converted to their object equivalent for primitive types). Replacing the key scheme & using a dedicated class to implement the keys yields some performance improvement. (aka 3x faster to get from a map).

The MethodMap uses an HashTable; by synchronizing MethodMap.

{add,get}

and synchronizing ClassMap.

{get,put}

on its MethodMap instance, it is possible to use a basic HashMap instead.

There are various places where a StringBuffer is used when a StringBuilder will suffice.

As a side note, there are a few places where the code readability can be improved by using strongly typed collections.

As a small "missing" feature, exposing access to the Introspector from the Uberspector (Introspector getIntrospector()) allows to re-use JEXL for some lower level introspection needs.