Workers pool
One problem we may face with some of the previous approaches to concurrency is their unbounded context. We cannot let an app create an unlimited amount of Goroutines. Goroutines are light, but the work they perform could be very heavy. A workers pool helps us to solve this problem.
Description
With a pool of workers, we want to bound the amount of Goroutines available so that we have a deeper control of the pool of resources. This is easy to achieve by creating a channel for each worker and having workers with either an idle or busy status. The task can seem daunting, but it's not at all.
Objectives
Creating a Worker pool is all about resource control: CPU, RAM, time, connections, and so on. The workers pool design pattern helps us to do the following:
Control access to shared resources using quotas
Create a limited amount of Goroutines per app
Provide more parallelism capabilities to other concurrent structures
A pool of pipelines
In the previous chapter, we saw how to work with a...
