AEM - How to cache model for page scope?

Question

I have a sling-model that needs to do some costly operations at initialization. These are related to the page scope, meaning based on currentPage properties. Hence it would make sense that the model gets initialized only once per page call.

I found a nice article regarding this at how to call sling model only once where they are setting the cache property of the Model-annotation to true.

But this unfortunately only works per resource.

So setting the cache=true property the model gets initialized for every component that calls it via data-sly-use. It only helps wenn calling data-sly-use in the same component (resource), but that's not helpful.

Can I somehow have the model cached for the entire lifecycle of the page-request?

Answer 1

SlingHttpServletRequest is a wrapper around HttpServletRequest and supports setAttribute and getAttribute methods provided by servlet api.

Setting attributes:

slingRequest.setAttribute(ATTRIBUTE_NAME, myobject);

Retrieve:

//check for null
MyClass myobject = (MyClass) slingRequest.getAttribute(ATTRIBUTE_NAME);