[jira] [Commented] (JCS-199) Disk cache directory and files not recreated after shutdown and restart

["Matthias Jordan (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/JCS-199?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17091448#comment-17091448 ] 

Matthias Jordan commented on JCS-199:
-------------------------------------

Thanks for fixing this!

> Disk cache directory and files not recreated after shutdown and restart
> -----------------------------------------------------------------------
>
>                 Key: JCS-199
>                 URL: https://issues.apache.org/jira/browse/JCS-199
>             Project: Commons JCS
>          Issue Type: Bug
>          Components: Composite Cache
>    Affects Versions: jcs-2.2.1
>            Reporter: Matthias Jordan
>            Assignee: Thomas Vandahl
>            Priority: Major
>             Fix For: jcs-3.0
>
>
> h1. How to repro
>  # Configure a composite cache with an indexed disk cache as the auxiliary.
>  # Now in one single JVM (e.g. in a single main method), do the following:
>  ## Create the cache, possibly putting something in.
>  ## Note that the disk cache files are created
>  ## JCS.shutdown()
>  ## Remove the files of the disk cache
>  ## Create the cache again.
>  ## Put stuff in
> h1. What to observe
> The disk cache files are not created again.
> In fact, the logging for the first run shows output like this:
> {noformat}
> INFORMATION: Constructed cache with name [CACHE] and cache attributes [ useLateral = true, useRemote = true, useDisk = true, maxObjs = 1, maxSpoolPerRun = 500, diskUsagePattern = SWAP, spoolChunkSize = 2 ]
> Jun 25, 2019 4:19:58 PM org.apache.commons.jcs.auxiliary.AuxiliaryCacheConfigurator parseCacheEventLogger
> INFORMATION: No cache event logger defined for auxiliary [jcs.auxiliary.DISK]
> Jun 25, 2019 4:19:58 PM org.apache.commons.jcs.auxiliary.AuxiliaryCacheConfigurator parseElementSerializer
> INFORMATION: Using standard serializer [org.apache.commons.jcs.utils.serialization.StandardSerializer@1ddf84b8] for auxiliary [jcs.auxiliary.DISK]
> [...]
> Jun 25, 2019 4:19:59 PM org.apache.commons.jcs.auxiliary.disk.indexed.IndexedDiskCache <init>
> INFORMATION: Region [CACHE] Indexed Disk Cache is alive.
> {noformat}
> The logging of the second run shows output like this:
> {noformat}
> INFORMATION: Constructed cache with name [CACHE] and cache attributes [ useLateral = true, useRemote = true, useDisk = true, maxObjs = 1, maxSpoolPerRun = 500, diskUsagePattern = SWAP, spoolChunkSize = 2 ]
> {noformat}
> Please note that in the latter case the lines about initializing the {{IndexedDiskCache}} are missing, event though the configuration states that a disk cache is to be used.
> h1. What is expected
> In the second run, the disk cache files should be created again as a consequence of creating new auxiliary caches. It is expected that shutting down the JCS will shut down every subsystem.
> h1. Relevance
> The issue comes up when restarting a web API system including deleting the contents of the temporary directory.
> h1. Note
> The bug may be fixed by setting the {{instance}} field in {{CompositeCacheManager}} to null at some point during the shutdown process. Maybe in {{CompositeCacheManager.shutdown()}}.
>  



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