JBoss/JMS Close Interceptor

This is a two phase valve. When close() is invoked on the facade object, the logic is as follows:

• Invokes closing() on the api and any sub objects (e.g. the closing a session closes the browsers, consumers and producers). This prevents any new requests on these objects.

• Waits for inflight requests to finish (on sub objects first).

• Invokes closed() on the api which tidies up the resources.

NOTE: Only one thread is allowed to actually perform the close.