Squid internals

The Storage Manager (src/store*.c)
Replacement Policies - API
repl = createRemovalPolicy(policyname);
/* Create a repl object */
repl->Add(repl, object, replnode);
/* Add the object into the replacement policy */
repl->Remove(repl, object, replnode);
/* Remove the object from the replacement policy */
repl->Referenced(repl, object, replnode);
/* An object has been referenced */
repl->Dereferenced(repl, object, replnode);
/* An object has been dereferenced */
walker = repl->WalkInit(repl);
/* Create a walker (eg to flush the object list to disk) */
object = walker->Next(walker);
/* get the next object in the repl list */
walker = repl->PurgeInit(repl);
/* Create a purge walker (used when deleting the objects) */