Is there a way to config WLS to fail over from a primary RAC cluster to a DR RAC cluster?

Here's the situation:
We have two Oracle RAC clusters, one in a primary site, and the other in a DR site
Although they run active/active using some sort of replication (Oracle Streams? not sure), we are being asked to use only the one currently being used as the primary to prevent latency & conflict issues
We are using this only for read-only queries.
We are not concerned with XA
We're using WebLogic 10.3.5 with MultiDatasources, using the Oracle Thin driver (non-XA for this use case) for instances
I know how to set up MultiDatasources for an individual RAC cluster, and I have been doing that for years.
Question:
Is there a way to configure MultiDatasources (mDS) in WebLogic to allow for automatic failover between the two clusters, or does the app have to be coded to failover from an mDS that's not working to one that's working (with preference to a currently labelled "primary" site).
Note:
We still want to have load balancing across the current "primary" cluster's members
Is there a "best practice" here?

Hi Steve,
There are 2 ways to connect WLS to a Oracle RAC.
1. Use the Oracle RAC service URL which contains the details of all the RAC nodes and the respective IP address and DNS.
2. Connect to the primary cluster as you are currently doing and use a MDS to load-balance/failover between multiple nodes in the primary RAC (if applicable).
    In case of a primary RAC nodes failure and switch to DR RAC nodes, use WLST scripts to change the connection URL and restart the application to remove any old connections.
    Such DB fail-over tests can be conducted in a test/reference environment to set up the required log monitoring and subsequent steps to measure the timelines.
Thanks,
Souvik.

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