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INT-3804: WatchServiceDirScan: Add OVERFLOW Event

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JIRA: https://jira.spring.io/browse/INT-3804

INT-3804: Polishing

Fix race conditions.
This commit is contained in:
Artem Bilan
2015-09-03 17:55:16 -04:00
committed by Gary Russell
parent 4f648a7e4f
commit f607f83bf2
3 changed files with 82 additions and 10 deletions
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8
src/reference/asciidoc/file.adoc
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@@ -217,6 +217,14 @@ On subsequent polls, files from new creation events are returned.
If a new subdirectory is added, its creation event is used to walk the new subtree to find existing files, as well
as registering any new subdirectories found.
NOTE: There is a case with `WatchKey`, when its internal events `queue` isn't drained by the program as quickly as
the directory modification events occur.
If the queue size is exceeded, a `StandardWatchEventKinds.OVERFLOW` is emitted to indicate that
some file system events may be lost.
In this case, the root directory is re-scanned completely.
To avoid duplicates consider using an appropriate `FileListFilter` such as the `AcceptOnceFileListFilter` and/or
remove files when processing is completed.
[source, xml]
----
<bean id="wsScanner" class="org.springframework.integration.file.WatchServiceDirectoryScanner">