How django-cachalot works¶
Reverse engineering¶
It’s a lot of Django reverse engineering combined with a strong test suite. Such a test suite is crucial for a reverse engineering project. If some important part of Django changes and breaks the expected behaviour, you can be sure that the test suite will fail.
Monkey patching¶
Django-cachalot modifies Django in place during execution to add a caching tool
just before SQL queries are executed.
When a SQL query reads data, we save the result in cache. If that same query is
executed later, we fetch that result from cache.
When we detect INSERT
, UPDATE
or DELETE
, we know which tables are
modified. All the previous cached queries can therefore be safely invalidated.