Configuring singleton proxy services in OSB clustered environment

The way things work in a clustered environment is way different . At times it is required to poll for the services only once even on a high available environment. I would like to take some time to explain where singleton is supported in OSB.
Unlike in the BPEL services OSB doesn't support singleton behaviour for all of the services
These are the following services that are supported for singleton in OSB.

1. File
2. FTP
3. Email

The respective configuration can be done from eclipse or from osbconsole . For more details refer to the oracle documentation
Link to oracle doc