October 2024
Intermediate to advanced
482 pages
15h 41m
Spanish
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Capítulo 6. Máquinas de estados finitos
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Ahora que nos hemos convertido en expertos en escribir servidores genéricos, ha llegado el momento de dominar nuestro siguiente comportamiento. Cuando prototipaban sistemas con lo que finalmente se convirtió en Erlang, los inventores del lenguaje Joe Armstrong, Mike Williams y Robert Virding estaban implementando un conmutador de telefonía suave que les permitía llamarse por teléfono y saludarse.1 Cada teléfono que accedía al conmutador se prototipó como un proceso que actuaba como un FSM. En un momento dado, la función representaría el estado en que se encontraba el teléfono (colgado, descolgado, marcando, sonando, etc.) y recibiría eventos asociados a ese estado (llamada entrante, marcación, descolgado, colgado, etc.).
Uno de los resultados de esta actividad de creación de prototipos fue garantizar que Erlang se convirtiera en un lenguaje adecuado y optimizado para construir FSM no triviales y escalables, un componente clave en muchos sistemas complejos. Los desarrolladores utilizan los FSM de para programar pilas de protocolos, conectores, proxies, sistemas de flujo de trabajo, motores de juegos y simulaciones, por mencionar sólo algunos ejemplos. Así que no fue ninguna sorpresa que, cuando aparecieron los comportamientos OTP, incluyeran FSM genéricos.
En este capítulo, presentamos los FSM implementados en Erlang puro. Dividimos ...
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