[jira] [Created] (CODEC-174) Improve performance of Beider Morse encoder

["Thomas Champagne (JIRA)" <ji...@apache.org>]

Thomas Champagne created CODEC-174:
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             Summary: Improve performance of Beider Morse encoder
                 Key: CODEC-174
                 URL: https://issues.apache.org/jira/browse/CODEC-174
             Project: Commons Codec
          Issue Type: Improvement
    Affects Versions: 1.7, 1.6
            Reporter: Thomas Champagne


I use Beider Morse encoder with Solr. When it indexes a lot of documents using this encoder, the import time is multiplied by 30. So, I have decided to optimize the current implementation in the commons-codec.

Currently, I have created two patch. The first patch delete a "performance hack" about a subsequence cache. This cache doesn't optimize performance and after deleting it, you can win some milliseconds.

The second patch changes the storage of the rules in memory using a Map instead of List. With it, you can access to a rule directly with the beginning of pattern. This patch divide the encoding time by 2.

I will try to find more improvement. If you have any idea, please tell me it.



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