CHAPTER 4

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Understanding Controllers

A Grails controller is a class that is responsible for handling requests coming in to the application. The controller receives a request, potentially does some work with the request, and finally decides what should happen next. What happens next might include the following:

  • executing another controller action (possibly but not necessarily in the same controller)
  • rendering a view
  • rendering information directly to the response

A controller is prototyped by default, meaning that a new instance is created for each request, so developers don’t need to be as cautious about maintaining thread-safe code in a singleton ...

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