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

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

Matthias Jordan created JCS-199:
-----------------------------------

             Summary: 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


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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