What Is an Application Server?
An application server is a different kind of platform from what most Rubyists are familiar with. Traditionally, a Ruby application is responsible for gathering together the libraries and tools it needs to run. This kind of architecture is illustrated in the following figure:
Ruby applications deal with many concerns like messaging and caching that are really outside the scope of their business requirements. When an MRI-based Ruby app needs to run a process asynchronously in the background, it must pull in Resque or SideKiq and integrate with it. Even worse, the developers need to manage and monitor the auxiliary ...
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