September 2025
Intermediate to advanced
336 pages
9h 1m
Spanish
Content preview from Concurrencia moderna en Java
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Capítulo 5. Valores de ámbito
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Quien no coloca las cosas en su sitio ha cometido una injusticia.
Ali ibn Abi Talib (que Dios esté complacido con él)
En este capítulo exploraremos ScopedValue, una potente adición a Java que se finalizó en el JDK 25. Proporciona una forma estructurada de vincular valores a un ámbito específico sin dejar de ser accesible y coherente con el contexto. A diferencia de las variables tradicionales ThreadLocal, que pueden ser engorrosas y propensas a fugas de memoria, esto ofrece un enfoque más limpio y eficiente cuando se trata de aplicaciones multihilo. En este capítulo, examinaremos por qué ScopedValue es un mejor sustituto de ThreadLocal y su API y, a continuación, recorreremos casos prácticos de uso.
Comencemos.
La carga de pasar el contexto
En a menudo hay situaciones en las que necesitamos compartir datos entre varias partes del código en las que no es factible utilizar simplemente argumentos de método. Esto es especialmente frecuente cuando nuestra aplicación depende de un framework. Para ilustrar la idea, veamos un ejemplo.
Imagina un marco de programación de trabajos en el que el código de usuario registra tareas que el marco ejecutará. Cada vez que el marco ejecuta un trabajo, crea un objeto JobContext que contiene metadatos como el nombre del trabajo, la prioridad y las restricciones de programación. Este contexto es esencial ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.