[jira] [Commented] (CAMEL-3686) Allow to share cache between bundles, and only clear cache when no more bundles access that cache

["Piotr Klimczak (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CAMEL-3686?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13047229#comment-13047229 ] 

Piotr Klimczak commented on CAMEL-3686:
---------------------------------------

Sorry for late answer but i haven't received email notification about your post.
So if you set your cache to be shared, then the cache manager will not be stopped during bundle shutdown. You have to care care about closing cacheManager by your self. This is because cache manager have to be shared across bundles as an osgi service.

It is a bit complicated. Let's take a look at simple example.
Let's say we have 3 bundles:
a) the one which instantiates cacheManagerFactory and exposes it as an osgi service
b) the first one, which uses exposed by bundle a) cacheManagerFactory and uses it's cacheManager in it's own cacheManagerFactory (as shown in above example: YourCacheManagerFactory)
c) the second one, same as b)

So b) and c) uses shared cacheManager of bundle a) and both are marked as shared. And because of cache manager is not closed during b) or c) shutdown.
BUT if you shutdown the a) bundle, then all caches used by b) and c) are gone.

This is how it suppose to work, but was not tested in full scenario yet. Only partially by some unit tests.
Please let me know if something is wrong with my idea.
Better ideas are welcome! :)

> Allow to share cache between bundles, and only clear cache when no more bundles access that cache
> -------------------------------------------------------------------------------------------------
>
>                 Key: CAMEL-3686
>                 URL: https://issues.apache.org/jira/browse/CAMEL-3686
>             Project: Camel
>          Issue Type: Improvement
>          Components: camel-cache
>    Affects Versions: 2.4.0
>         Environment: camel-cache 2.4.0-fuse-01-00
>            Reporter: Justas
>             Fix For: 2.9.0
>
>         Attachments: camel-cache.shared.patch, camel-cache.zip, diff.txt
>
>
> I am using camel-cache component in serviceMix. Cache endpoint uri is 
> "cache://elements?maxElementsInMemory=2&memoryStoreEvictionPolicy=MemoryStoreEvictionPolicy.FIFO&overflowToDisk=false&eternal=false&timeToLiveSeconds=800" 
> I have 2 bundles (core.jar, services.jar). Inside those bundles I use 
> @EndpointInject(uri = Constants.CACHE_URI) 
> ProducerTemplate cacheTemplate; 
> cacheTemplate.requestBodyAndHeaders(...) 
> core.jar puts and reads elements from cache. 
> services.jar only reads elements from cache. 
> After deploying both bundles it works fine, but if i uninstall services.jar, cache is "destroyed". core.jar (and all others) can't put objects into cache anymore. 
> How could I make all bundles to "share" the same cache? 

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