What version are you using? (I recommend the latest temp build.)
Try shutting down in an orderly fashion. Call shutdown on the
CompositeCacheManager. In any case, the disk cache registers a vm shutdown
listener. It should write the data.
Are there errors in the log?
Do you see any .data file? If not, there may be a configuration or a file
permission problem. Check the logs. Set the memory size to 0 and see if the
data goes to disk during normal usage.
Aaron
--- On Wed, 8/19/09, Stuart Maclean <stu...@apl.washington.edu> wrote:
> From: Stuart Maclean <stu...@apl.washington.edu>
> Subject: memory cache not written out to disk on shutdown?
> To: jcs-users@jakarta.apache.org
> Date: Wednesday, August 19, 2009, 12:04 PM
> Hi all, I am trying to use JCS in a
> mapping application. I have a Swing map tool, which
> retrieves and displays map tile images from eg
> openstreetmap.org. Logically my cache objects are
> Images, though I am converting to and from int[] for
> serialization. My cache keys are a string encoding of
> the map tile components z,y,x, e.g z-y-x.
>
> In my cache.ccf, I am specifying properties just for
> default regions. I am right in assuming that my named
> regions in my code 'inherit' their configuration from the
> defaults? Is it true also that if I use two regions,
> R1 and R2, that EACH region gets its own 10 objects
> (MaxObjects) or is 10 the total number of in-memory cached
> objects?
>
> What I want to happen is this. When cache empty, go
> to map tile server and get tiles. Store to JCS cache.
> Mainatin say 50 in memory for each tile 'layer' (where a
> layer maps to a tile set from one map server). When my
> app requires the 51st image, flush LRU to disk cache. When
> my app exits, serialize the entire memory cache to disk,
> effectively using the cache as a persistence engine.
> When restart my app, get Images from local disk before going
> to remote map server.
>
> Alas, when I call shutdown (from a VM shutdown listener,is
> this the problem???) my .key and .data files on disk never
> seem to be updated. It's as though the in memory cache
> is never 'flushed' to disk? Should it be?
>
> I seem to be missing something here? Any help
> appreciated.
>
> Stuart
>
> My cache.ccf is here...
>
> jcs.default=DC
> jcs.default.cacheattributes=org.apache.jcs.engine.CompositeCacheAttributes
> jcs.default.cacheattributes.MaxObjects=10
> jcs.default.cacheattributes.MemoryCacheName=org.apache.jcs.engine.memory.lru.LRUMemoryCache
>
> jcs.default.elementattributes.IsEternal=true
> jcs.default.elementattributes.MaxLifeSeconds=1000000
> jcs.default.elementattributes.IdleTime=1800
> jcs.default.elementattributes.IsSpool=true
> jcs.default.elementattributes.IsRemote=true
> jcs.default.elementattributes.IsLateral=true
>
> jcs.auxiliary.DC=org.apache.jcs.auxiliary.disk.indexed.IndexedDiskCacheFactory
> jcs.auxiliary.DC.attributes=org.apache.jcs.auxiliary.disk.indexed.IndexedDiskCacheAttributes
> jcs.auxiliary.DC.attributes.DiskPath=${user.home}/.sgDesktop/map/cache3
> jcs.auxiliary.DC.attributes.MaxKeySize=100000
> jcs.auxiliary.DC.attributes.MaxPurgatorySize=100000
> #jcs.auxiliary.DC.attributes.ShutdownSpoolTimeLimit=60
>
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