[hibernate-dev] multi-tenancy and ConnectionProvider

[Emmanuel Bernard]

Yes but on top of Oracle, I could use the VPD approach or the more portable but less integrated schema approach, right? Somehow the user will be able to chose and the connection provider will do different magic tricks. Or am I missing some step?

On 29 mars 2011, at 17:43, Steve Ebersole wrote:

> VPD is really the same notion as a tenant.  So the ConnectionProvider having 
> access to the tenant already solves that
> 
> On Tuesday, March 29, 2011, at 10:31 am, Emmanuel Bernard wrote:
>> 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 at hibernate.org>
>>> http://hibernate.org
>>> _______________________________________________
>>> hibernate-dev mailing list
>>> hibernate-dev at lists.jboss.org
>>> https://lists.jboss.org/mailman/listinfo/hibernate-dev
> 
> ---
> Steve Ebersole <steve at hibernate.org>
> http://hibernate.org
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