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Many applications face the problem of communicating to external processes via stateful connections, for instance JDBC connections to databases, or SSH connections to a network server. Traditional manual connection handling a la JDBC places all the management burden on the client code, and is error prone.
For a recent project we designed – with prudent use of the Reader, Free and IO monads – a superior API that prevents misuse. This talk explores the evolution of this API and the challenges it presented and solved.
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