Multiple Command Objects per Controller

[krishnan.1000]

Hi,

I have a controller which basically has to perform depending upon user input.

I wanted to ask if there was a way to set multiple commands to the controller. If yes, how. I was thinking if there would be a command factory, but I dont know.

Please help me here.

[Chris Lee]

Could you be more specific about your needs? Perhaps an example?

Since a Controller instantiates a command object to show the form, and then binds the submitted values to that object on form submission, the command object type is obviously fixed; perhaps choosing an appropriate controller is a better solution?

[krishnan.1000]

I have a page, which has multiple form asynchronous form submissions. Each submission invokes a unique business service. Hence, I wanted to know if there was a way map separate command to it. Perhaps, it would be better to map a different controller for a unique form submission. I dont know how to do it. Is there a way to do this then?

If yes, does each controller have to have a separate command object associated with the controller?


Thanks,

Karthik Krishnan

[Chris Lee]

Spring's MVC controller's are stateless; each request is against the same instance of the controller and will maintain it's own state (i.e. command object) - so multiple asynchronous form submissions aren't a problem.

Be careful about maintaining your own state (i.e. member variables in the controller manipulated per-request or HTTP session attributes); these are best avoided if possible, otherwise appropriate synchronization is required.