Contributed by Jérémy Derussé in #44155.
In Symfony 5.2 we introduced a Semaphore component as an alternative to the existing Lock component. According to the Wikipedia definition, a semaphore is a variable or abstract data type used to control access to a common resource by multiple processes in a concurrent system such as a multitasking operating system. Broadly speaking, a semaphore allows N process to access a resource, and a lock is a semaphore where N = 1. In Symfony 6.1 we're improving Semaphore integration in Symfony applications thanks to the new framework.semaphore option. First, you can pass a string with the DSN of the store used by the semaphore:
# config/packages/framework.yamlframework: semaphore: redis://localhost
If your application uses multiple semaphores, configure each of them separately using the same configuration option:
# config/packages/framework.yamlframework: semaphore: invoices: redis://localhost/1 orders: redis://localhost/2
That's all! Symfony will create the configured semaphore(s) and will make them available to your application.
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