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From "Volodymyr Buell (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CAMEL-2603) support get operation for cache
Date Wed, 12 May 2010 09:25:49 GMT

    [ https://issues.apache.org/activemq/browse/CAMEL-2603?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=59303#action_59303
] 

Volodymyr Buell commented on CAMEL-2603:
----------------------------------------

Example of GET command usage:

                   from("direct:start")
                   // Prepare headers
                   .setHeader(CacheConstants.CACHE_OPERATION, constant(CacheConstants.CACHE_OPERATION_GET))
                   .setHeader(CacheConstants.CACHE_KEY, constant("Ralph_Waldo_Emerson")).
                   .to("cache://TestCache1").
                   // Check if entry was not found
                   .choice().when(header(CacheConstants.CACHE_ELEMENT_WAS_FOUND).isNull()).
                   // If not found, get the payload and put it to cache
                   .to("cxf:bean:someHeavyweightOperation").
                   .setHeader(CacheConstants.CACHE_OPERATION, constant(CacheConstants.CACHE_OPERATION_ADD))
                   .setHeader(CacheConstants.CACHE_KEY, constant("Ralph_Waldo_Emerson"))
                   .to("cache://TestCache1")
                   .end()
                   .to("direct:nextPhase");

Example of CHECK command usage:

                   from("direct:start")
                   // Prepare headers
                   .setHeader(CacheConstants.CACHE_OPERATION, constant(CacheConstants.CACHE_OPERATION_CHECK))
                   .setHeader(CacheConstants.CACHE_KEY, constant("Ralph_Waldo_Emerson")).
                   .to("cache://TestCache1").
                   // Check if entry was not found
                   .choice().when(header(CacheConstants.CACHE_ELEMENT_WAS_FOUND).isNull()).
                   // If not found, get the payload and put it to cache
                   .to("cxf:bean:someHeavyweightOperation").
                   .setHeader(CacheConstants.CACHE_OPERATION, constant(CacheConstants.CACHE_OPERATION_ADD))
                   .setHeader(CacheConstants.CACHE_KEY, constant("Ralph_Waldo_Emerson"))
                   .to("cache://TestCache1")
                   .end();


Note: CHECK command tests existence of the entry in the cache but doesn't place message to
the body.

> support get operation for cache
> -------------------------------
>
>                 Key: CAMEL-2603
>                 URL: https://issues.apache.org/activemq/browse/CAMEL-2603
>             Project: Apache Camel
>          Issue Type: Improvement
>    Affects Versions: 2.2.0
>            Reporter: Anand
>            Assignee: Claus Ibsen
>             Fix For: 2.3.0
>
>         Attachments: camel-cache_get_refactoring-vb.patch
>
>
> Please support get operation on cache component.
> here is the discussion.
> http://old.nabble.com/read-from-cache-component-ts28071593.html

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