[rules-users] Efficiency of using inline evals in Drools 5

Hello! I have a question about how an inline eval function is or isn’t efficient in the algorithm- I have many User objects that I am inserting into Working Memory (in a stateful session), and each User object has as ArrayList of Messages The message class has 2 String fields: text and logid I have custom boolean function user.containsText(String keyword) function that takes in a string, and searches to see if that keyword contained in the text field of one of the message entries in the User message arraylist. If I use an inline eval statement to implement this: $user: User( eval (containsText ( “sample text”) ) ) Will it re-evaluate each time? Or will Drools cache the result and remember it/ create a node based on it so the node will have every user this is true for, and it doesn’t re-evaluate when the users or rules are modified? Will it create a "node" in the algorithm for all the users that this function is true for? On a similar note, if I use the “matches” comparator in a rule creation, does it create a node and cache the result? Will it automatically re-evaluate each time the field its matched against is modified? Thanks so much! Nancy