Caching scheme for two sites that share DB

Let's assume I have two sites around one DB. The first is based on FatFreeCRM and handles the business logic, let's call it site_1 and the second one is based on RadiantCMS and handles presentation logic. Let's call it site_2 Some of the pages in RadiantCMS use models from FatFreeCRM (mostly to show them, not to modify).开发者_Go百科 And from FatFreeCRM I am able to add/remove/modify some instances of models.

The problem is that I want these pages in RadiantCMS to be cached. But I can't expire cache directly from FatFreeCRM.

What is the best cache strategy for this case?

Thank you.

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I would suggest creating an API on RadiantCMS that allows you to expire certain cached pages. For example:

site_1.com/api/expire/sldfj2389283kd

You could then call this expire action from FatFreeCRM anytime you want to expire a certain key or collection of keys, and perform the actual cache expiration on RadiantCMS.