Mage_Index examination notes

mage_index.txt

Mage::getSingleton('index/indexer')->processEntityAction($entity, $entityType, $eventType)
  'index/indexer'->logEvent($entity, $entityType, $eventType)
    If indexer is locked, nothing happens
    Creates a new 'index/event' instance, sets entity, type, data object, and primary key
    Runs 'register' method of each 'index/process' which loads the indexer based on the xml config from 'global/index/indexer/<INDEXER>/model'
      If event matches indexer using matchEvent method: (checks if the appropriate key/value is in indexer's _matchedEntities property)
	    Sets the event's namespace to the name of the indexer class
	    Calls the indexer's register method which matches the event again and calls the abstract method _registerEvent($event)
	    The indexer implementation now needs to add data to the eventusing addNewData
	    Adds the process id of the process to the event
	    Resets the event namespace
  If event has process ids (a process indexer matched the event) index/indexer->indexEvent is called
    Runs 'processEvent' method of each 'index/process'
	  If event matches indexer
	    Calls the indexer's _processEvent abstract method to process the event
		  callEventHandler is a provided method of calling a method named after the entity and event type using the indexer's resource model
  The event is saved to the database