[jira] [Commented] (JAMES-3140) Provide a CachedDumbBlobStore

["Raphael Ouazana (Jira)" <se...@james.apache.org>]

    [ https://issues.apache.org/jira/browse/JAMES-3140?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17077026#comment-17077026 ] 

Raphael Ouazana commented on JAMES-3140:
----------------------------------------

What's happening if there are 2 requests for the same uncached value at the same it?

Can you forecast to make one of the 2 requests waiting for the cache to be loaded instead of reading both at the same time in the blobstore?

> Provide a CachedDumbBlobStore
> -----------------------------
>
>                 Key: JAMES-3140
>                 URL: https://issues.apache.org/jira/browse/JAMES-3140
>             Project: James Server
>          Issue Type: Improvement
>            Reporter: René Cordier
>            Priority: Major
>
> {{This DumbBlobStore wraps another dumbBlobStore and compose it with a Cache.}}
> Blobs are cached upon writes
> Only blobs of the default bucket are cached.
> Upon reads:
>  * the cache is queried
>  * if the cache is empty then load it's value from the blobStore
>  * and populate the cache
> Provide guice bindings in james-distributed guice product:
>  * configure CassandraBlobStoreCache
>  * enable caching if {{blobStore.cache.enabled=true}}



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