[jira] [Resolved] (LANG-1358) Improve StringUtils#replace throughput

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[jira] [Resolved] (LANG-1358) Improve StringUtils#replace throughput

JIRA jira@apache.org

     [ https://issues.apache.org/jira/browse/LANG-1358?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Pascal Schumacher resolved LANG-1358.
-------------------------------------
       Resolution: Fixed
         Assignee: Pascal Schumacher
    Fix Version/s: 3.7

> Improve StringUtils#replace throughput
> --------------------------------------
>
>                 Key: LANG-1358
>                 URL: https://issues.apache.org/jira/browse/LANG-1358
>             Project: Commons Lang
>          Issue Type: Improvement
>    Affects Versions: 3.6
>            Reporter: Pascal Schumacher
>            Assignee: Pascal Schumacher
>            Priority: Minor
>             Fix For: 3.7
>
>
> {quote}
> StringUtils#replace uses substring to append a String region into a StringBuilder. This causes useless copies, as StringBuilder#append can take start and end indexes.
> Modification:
> Use proper StringBuilder#append overload (https://docs.oracle.com/javase/8/docs/api/java/lang/StringBuilder.html#append-java.lang.CharSequence-int-int-).
> Result:
> Based on benchmark from JOOQ’s post (https://blog.jooq.org/2017/10/11/benchmarking-jdk-string-replace-vs-apache-commons-stringutils-replace):
> Benchmark Mode Cnt Score Error Units
> StringReplaceBenchmark.testFastStringReplaceLongStringOneMatch thrpt 21
> 7546534,219 ± 145523,962 ops/s
> StringReplaceBenchmark.testStringUtilsReplaceLongStringOneMatch thrpt
> 21 7353512,552 ± 124498,228 ops/s
> StringReplaceBenchmark.testFastStringReplaceLongStringSeveralMatches
> thrpt 21 5077255,810 ± 62358,937 ops/s
> StringReplaceBenchmark.testStringUtilsReplaceLongStringSeveralMatches
> thrpt 21 4108357,612 ± 92909,038 ops/s
> StringReplaceBenchmark.testFastStringReplaceShortStringOneMatch thrpt
> 21 15911221,949 ± 541064,693 ops/s
> StringReplaceBenchmark.testStringUtilsReplaceShortStringOneMatch thrpt
> 21 10677897,475 ± 491091,973 ops/s
> StringReplaceBenchmark.testFastStringReplaceShortStringSeveralMatches
> thrpt 21 9271742,251 ± 220150,121 ops/s
> StringReplaceBenchmark.testStringUtilsReplaceShortStringSeveralMatches
> thrpt 21 6158829,188 ± 99637,607 ops/s
> {quote}
> source: https://github.com/apache/commons-lang/pull/300



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