Can we write a Mule custom connector which can act as a Message Source?
I know we can write a connector using which a flow can integrate with the relevant system/endpoint. Can any please tell me if I can write a connector which act as a Message Source?
Yes you can, see here: it has an example of how it's done in the Salesforce connector for the Streaming API Message Source: http://www.mulesoft.org/documentation-3.2/display/32X/Creating+Message+Sources