Regarding option #1--you probably don't want to simply include a "where client
id = ?" in all your queries--what if you forget in once place, and expose data
improperly?
Instead, look at the restricted entity manager in the wiki example, which
applies a filter to all queries that use it. The configuration of the
restricted entity manger is in components.xml, as follows:
<core:managed-persistence-context name="restrictedEntityManager"
auto-create="true"
entity-manager-factory="#{wikiEntityManagerFactory}">
<core:filters>#{accessLevelFilter}</core:filters>
</core:managed-persistence-context>
Setting up a filter is described starting on page 540 of the Java Persistence
with Hibernate book--I highly recommend it.
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