Andy Wilkinson created LOGBACK-1409:
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Summary: Compile and reuse a Pattern in
FileFilterUtil.computeCurrentPeriodsHighestCounterValue(String)
Key: LOGBACK-1409
URL: https://jira.qos.ch/browse/LOGBACK-1409
Project: logback
Issue Type: Improvement
Components: logback-core
Affects Versions: 1.2.3
Reporter: Andy Wilkinson
Assignee: Logback dev list
Priority: Minor
{{FileFilterUtil.filesInFolderMatchingStemRegex(String)}} currently calls
{{String.matches(stemRegex)}} once for each file or directory in the folder.
The is inefficient and noticeably so for folders with large numbers of files as
it causes the same {{Pattern}} to be compiled once for each file or directory
in the folder. The repeat compilation could be avoided by performing it once
outside of the filtering callback:
{code:java}
Pattern pattern = Pattern.compile(stemRegex);
return file.listFiles(new FilenameFilter() {
@Override
public boolean accept(File dir, String name) {
return pattern.matcher(name).matches();
}
});
{code}
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