CloseInterceptor

Acts as a valve to stop requests on closed objects. It 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.

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