Design two-user communications handler with exceptions

Q: Design two-user communications handler with exceptions

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Question

Implement a two-user communications handler. Create: (A) CommsHandler(CommsHandlerABC) with methods connect(self, user1: Caller, user2: Caller) -> str, hangup(self, user1: Caller, user2: Caller) -> str, and clear_all(self) -> None; and (B) CommunicationException(Exception) that accepts a message string. Behavior: Only two users can communicate at any given time; no other users can connect until the current communication ends. connect: If user1 is the same as user2, raise CommunicationException with the message "{user1.name} cannot connect with {user2.name}". If user1 and user2 are different and the line is in use, raise CommunicationException("Connection in use. Please try later"). If the line is free, store the active pair and return "Connection established between {user1.name} and {user2.name}". hangup: If user1 is the same as user2, raise CommunicationException with the message "{user1.name} cannot hangup with {user2.name}". If user1 and user2 are different and currently communicating, disconnect them and return "{user1.name} and {user2.name} are disconnected". clear_all: Clear the communication channel regardless of current users. Assume a provided Caller class with a name attribute.

Design two-user communications handler with exceptions

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