[infinispan-issues] [JBoss JIRA] (ISPN-9604) Support to run converters in the user requested format

[Gustavo Fernandes (Jira)]

     [ https://issues.jboss.org/browse/ISPN-9604?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gustavo Fernandes updated ISPN-9604:
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    Description: 
As described in the [docs|http://infinispan.org/docs/stable/user_guide/user_guide.html#event_marshalling], a filter/converter can optionally specify a {{MediaType}} to process events, and let Infinispan perform the conversion between the storage format and the chosen format. Once converters are applied, the last step, in case it's needed, it to convert the event to the request format, which is the format that the cache was decorated with the {{withMediaType(...)}} method when the listener registration was performed.

This is the basic mechanism that allow events to be received in a different MediaType than the data is stored, at the same time allowing the filter/converter to pick the best format to process data.

Some converters, such as {{org.infinispan.server.hotrod.KeyValueVersionConverter}} (used in NearCache and the Spark Connecor) cannot work in this scheme since as part of its operation, it reads the stored key and values and creates a new value which is the aggregation of the Key and the Value in the byte[] format, thus preventing the final transformation step to the request mediatype.

For this case it'd be interesting to have the possibility of applying the converters's convert() operation *after* having transformed the Key and Values to the final request format, therefore the final event value will be an aggregated byte[] but in the user requested format.

  was:
As described in the [docs|http://infinispan.org/docs/stable/user_guide/user_guide.html#event_marshalling], a filter/converter can optionally specify a {{MediaType}} to process events, and let Infinispan perform the conversion between the storage format and the chosen format. Once converters are applied, the last step, in case it's needed, it to convert the event to the request format, which is the format that the cache was decorated with the {{withMediaType(...)}} method when the listener registration was performed.

Some converters, such as {{org.infinispan.server.hotrod.KeyValueVersionConverter}} (used in NearCache and the Spark Connecor) cannot work in this scheme since as part of its operation, it reads the stored key and values and creates a new value which is the aggregation of the Key and the Value in the byte[] format, thus preventing the final transformation step to the request mediatype.

For this case it'd be interesting to have the possibility of applying the converters's convert() operation *after* having transformed the Key and Values to the final request format, therefore the final event value will be an aggregated byte[] but in the user requested format.



> Support to run converters in the user requested format
> ------------------------------------------------------
>
>                 Key: ISPN-9604
>                 URL: https://issues.jboss.org/browse/ISPN-9604
>             Project: Infinispan
>          Issue Type: Feature Request
>          Components: Listeners, Remote Protocols
>    Affects Versions: 9.4.0.Final
>            Reporter: Gustavo Fernandes
>            Assignee: Gustavo Fernandes
>            Priority: Major
>
> As described in the [docs|http://infinispan.org/docs/stable/user_guide/user_guide.html#event_marshalling], a filter/converter can optionally specify a {{MediaType}} to process events, and let Infinispan perform the conversion between the storage format and the chosen format. Once converters are applied, the last step, in case it's needed, it to convert the event to the request format, which is the format that the cache was decorated with the {{withMediaType(...)}} method when the listener registration was performed.
> This is the basic mechanism that allow events to be received in a different MediaType than the data is stored, at the same time allowing the filter/converter to pick the best format to process data.
> Some converters, such as {{org.infinispan.server.hotrod.KeyValueVersionConverter}} (used in NearCache and the Spark Connecor) cannot work in this scheme since as part of its operation, it reads the stored key and values and creates a new value which is the aggregation of the Key and the Value in the byte[] format, thus preventing the final transformation step to the request mediatype.
> For this case it'd be interesting to have the possibility of applying the converters's convert() operation *after* having transformed the Key and Values to the final request format, therefore the final event value will be an aggregated byte[] but in the user requested format.



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