Support datastore multitenancy
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Key: JDO-703
URL: https://issues.apache.org/jira/browse/JDO-703
Project: JDO
Issue Type: New Feature
Components: api, tck
Affects Versions: JDO 3 maintenance release 2 (3.2)
Reporter: Matthew T. Adams
Support database multitenancy as an optional feature (using standard JDO option
"javax.jdo.option.Multitenancy"), where different customers' data can be stored
in the same database and the implementation amends all query filters to include
a tenant identifier where instructed by the user via metadata. I forsee a
minimal need for only two pieces of metadata information: first, that & where
multitenancy should be used, and second, the multitenancy mapping information.
Multitenancy could be given by the developer at the PMF or PM level, where he
specifies a property, say "javax.jdo.multitenancy.discriminator" or similar,
corresponding to new PMF or PM property multitenantDiscriminator, whose value
represents the tenant discriminator. Then, queries, loads via id, or
dereferences including any entities identified via metadata as multitenant
would automatically include in the underlying datastore query filter a
condition that uses the tenant discriminator to include only those entities
that have the given tenant discriminator.
The entire persistence unit (PMF), persistence context (PM), individual
packages, or individual classes could be identified as multitenant via metadata
(a @Multitenant annotation or external metadata). Similarly, discriminator
mapping information could be defaulted or supplied in a manner similar to
existing mapping metadata.
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