March 2025
Intermediate to advanced
240 pages
5h 54m
Spanish
Content preview from Eficiente Node.js
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Capítulo 3. Asincronía y eventos
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Hemos aprendido que el concepto más importante de Node es su modelo basado en eventos, que también se conoce como modelo no bloqueante. Node asocia las operaciones asíncronas a eventos e internamente se encarga de ejecutarlas independientemente de otras operaciones. Una vez que una operación asíncrona termina de ejecutarse, Node programa la ejecución de tu código que depende de esa operación.
En este capítulo, ampliaremos los conceptos importantes de los eventos y sus funciones manejadoras como devoluciones de llamada, promesas y escuchadores. Aprenderemos cómo gestiona Node la programación de operaciones asíncronas con su bucle de eventos y sus colas de eventos, y veremos ejemplos de cómo crear y utilizar emisores de eventos y funciones de escucha personalizados.
Sincronización frente a asincronización
Un navegador web es un entorno de un solo hilo en el que todo el código relacionado con el usuario se ejecuta en un hilo principal. Si tienes una función lenta en tu sitio web, los usuarios no podrán ni siquiera desplazarse mientras esa función se esté ejecutando. Esto se debe a que el desplazamiento necesita utilizar el único hilo ocupado.
También dispones de un único hilo para tu código Node. Node trabaja con otros hilos internamente, y también puedes crear manualmente tus propios hilos cuando lo necesites, pero es extremadamente ...
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