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class Handler: (source)
Handle a XML-RPC request and store the state for a request in progress.
Override the run() method and return result using self.result, a Deferred.
We require this class since we're not using threads, so we can't encapsulate state in a running function if we're going to have to wait for results.
For example, lets say we want to authenticate against twisted.cred, run a LDAP query and then pass its result to a database query, all as a result of a single XML-RPC command. We'd use a Handler instance to store the state of the running command.