Java EE 8 Design Patterns and Best Practices

Concurrency

A twelve-factor app must be designed to scale using a process model that allows execution of the processes in parallel mode. This is much like the UNIX process model used when executing daemons. Consequently, we can design processes that only deal with HTTP requests while we can also have processes that deal with tasks that are very long and executed in the background. The process model shows its importance when the application needs to scale, because, at that moment, the application is replicated, making copies of the processes instead of executing a new instance.