Re: [hibernate-dev] multi-tenancy and ConnectionProvider
For info, I like #2 the best
ConnectionOptions can deal in the future with:
- schema based diff
- user based diff ala Oracle VPD
interface ConnectionOptions {
TenantType getTenantType();
String getDefaultSchema();
String getUser() //is that how VPD filters out?
..some more techniques later
}
enum TenantType {
NONE,
SCHEMA,
USER
}
With getTenantType, a ConnectionProvider can return the right connection or yell if it
does not support it. We could also imagine asking the ConnectionProvider to return the
array of supported tenantTypes so that we can raise the exception at startup time.
On 22 mars 2011, at 22:21, Steve Ebersole wrote:
reference
http://opensource.atlassian.com/projects/hibernate/browse/HHH-5697
For multi-tenancy implemented by sepaerate schema we need the ability to tell
the ConnectionProvider about the tenant for the given getConnection() request.
I really see 3 approaches to this:
1) Have 2 hierarchies here. The current ConnectionProvider contract remains
the same. Add a new MultiTenantConnectionProvider with methods accounting for
tenant
2) Just alter the ConnectionProvider contract to pass information in. If we
go this route I prefer the "parameter object" pattern where we pass in
ConnectionOptions interface (see issue).
3) Use contextual lookup. ConnentionProviders interested in (or capable of
understanding) mulit-tenancy would perform some kind of "contextual"
(ThreadLocal, etc) lookup for the needed information.
Thoughts? Discussions?
---
Steve Ebersole <steve(a)hibernate.org>
http://hibernate.org
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