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From "james strachan (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CAMEL-6509) add a cache get() or getOrUpdate() pattern to Camel?
Date Thu, 04 Jul 2013 09:05:20 GMT

     [ https://issues.apache.org/jira/browse/CAMEL-6509?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

james strachan updated CAMEL-6509:
----------------------------------

    Summary: add a cache get() or getOrUpdate() pattern to Camel?  (was: add a cache lookup-or-update
type pattern to Camel?)
    
> add a cache get() or getOrUpdate() pattern to Camel?
> ----------------------------------------------------
>
>                 Key: CAMEL-6509
>                 URL: https://issues.apache.org/jira/browse/CAMEL-6509
>             Project: Camel
>          Issue Type: New Feature
>            Reporter: james strachan
>
> See the example 7 on the cache page:
> http://camel.apache.org/cache.html
> it'd be nice if we could easily add a 'lookup in the cache for a given key expression,
use it as the payload if its found, otherwise invoke some remote endpoint, update the cache
and return that new value'; so folks can easily add caching in front of endpoints.
> I'm wondering if this might be more intuitive if its an actual pattern? e.g.
> {code}
> from("seda:foo").
>   cache("myCacheName").xpath("/foo/customerId").
>      getOrUpdate("http://the.remote.thingy").
>   // now carry on doing normal camel stuff...
> {code}
> We can then use expressions for the key to use (and possibly for the cache name - or
a constant string can be defaulted), then the operations are either get() or getOrUpdate()
- the latter taking an Endoint or URI to invoke if there is no value in the cache.
> e.g. to just do a cache lookup...
> {code}
> from("seda:foo").
>   cache("myCacheName").xpath("/foo/customerId").
>      get().
>   // now carry on doing normal camel stuff...
> {code}

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