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https://issues.apache.org/jira/browse/JAMES-3926?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Benoit Tellier updated JAMES-3926:
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Attachment: adr-68-architecture-diagram.png
> Refactor quota for Cassandra
> ----------------------------
>
> Key: JAMES-3926
> URL: https://issues.apache.org/jira/browse/JAMES-3926
> Project: James Server
> Issue Type: New Feature
> Components: cassandra
> Reporter: Benoit Tellier
> Priority: Major
> Attachments: adr-68-architecture-diagram.png
>
>
> h3. Why?
> Quota is a generic concept, with generic storage, that is found all over the
> place.
> For instance, maximum definitions are generic:
> - Maximum definition for mailbox quota count/size per user
> - Maximum definition for mailbox quota count/size per domain
> - Maximum definition for mailbox quota count/size - global
> - Sieve definition for mailbox quota count/size per user
> - Sieve definition for mailbox quota count/size - global
> Idem, current value tracking is also generic:
> - Current value for mailbox quota
> - Current value for Sieve quota
> - Current value for JMAP uploads quota
> We could easily introduce an abstraction reducing the storage boiler plate
> here:
> - One for maximum definitions
> - One for current values
> h3. Expected benefits
> -> reduced boiler plate
> -> Less Cassandra tables: shrink from 8 tables to just 2
> -> Adding quota related features then becomes way easier. Sample usage:
> auota for future release? For the count of mailboxes? For identities? ETC...
> h3. How?
> We define the Cassandra quota helpers into backends/cassandra.
> Define a POJO wrapping a string called `Component`. Exemple value for
> `Component`: mailbox, sieve, jmapUploads.
> Define a POJO wrapping a string called `Scope`. Example value: user, domain,
> global.
> Define a POJO wrapping a string called `Identifier`. Example value: username,
> domain, placeHolder for global quotas, etc...
> Define a QuotaLimitsDAO: store and returns numeric nullable values for a
> triptic Component+Scope+Identifier.
> Define a QuotaCurrentValuesDAO: store and returns numeric counter values for
> a triptic Component+Scope+Identifier.
> This API will be generic enough in order to re-implement mailbox / sieve DAOs
> from it, and implement JAMES-3925.
> By default the old quota definitions should not be loaded when starting
> James. Migration from old POJOs to the new one can be done via a module
> chooser.
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