[jira] [Updated] (GEODE-3676) Add WriteInterceptor to modify a value before being put into the cache

["Lynn Gallinat (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/GEODE-3676?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Lynn Gallinat updated GEODE-3676:
---------------------------------
    Summary: Add WriteInterceptor to modify a value before being put into the cache  (was: Add a new callback to modify a value before being put into the cache)

> Add WriteInterceptor to modify a value before being put into the cache
> ----------------------------------------------------------------------
>
>                 Key: GEODE-3676
>                 URL: https://issues.apache.org/jira/browse/GEODE-3676
>             Project: Geode
>          Issue Type: New Feature
>          Components: regions
>            Reporter: Fred Krone
>            Assignee: Lynn Gallinat
>
> Create a new callback called WriteInterceptor to allow a user to change the value to be written during a write operation.
> Use cases:
> # Needing to update an entry when doing write behind caching.  For example -- inserting into a DB and needed to add the auto generated id to the domain object entry.
> # Needing to update an entry when doing inline-caching.  Example: needing to update a PdxInstance on-the-fly.
> Requirements:
> # This callback should not be invoked while holding locks on the RegionEntry.
> # Each Region will only support one instance of WriteInterceptor.
> # Callback should be invoked:
> #* before CacheWriter
> #* before value constraint checks
> #* before null checks on a put
> #* after CacheLoader
> # The WriteInterceptor must be mutable at runtime so that a user can change the WriteInterceptor on an existing region.
> # The WriteInterceptor can be installed or changed via APIs and gfsh commands.
> # The WriteInterceptor should be invoked only in the member that initiated the write operation and should not be invoked at subsequent distribution points.



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