class Server

Hanging get for an interface addition/deletion change.

Clients should only have one call of this method at a time; a second

call to this method while a call is already pending will cause the

server end of the protocol to be closed.

If there are N interfaces present at the time the server end of the

protocol is initialized, then the first N invocations of this method

will return [`Event.existing`] followed by a single [`Event.idle`]

indicating that all existing interfaces have been sent. Subsequent calls

will immediately return if there is a change to be reported, or block

until a change occurs.

The server may choose to coalesce property change events, e.g. when

multiple independent property changes occur. As a result, clients cannot

assume that the order in which they observe the interface changes is the

order in which the changes occurred.

- response `event` the interface change event.

|bind_handler| returns a handler that binds incoming connections to this

server implementation.

The returned handler borrows the server instance.

The server must outlive the provided |dispatcher|. Only after

the dispatcher is shutdown will it be safe to destroy the servers.

The server should not be moved.