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listener.cljc
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listener.cljc
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(ns clara.rules.listener
"Event listeners for analyzing the flow through Clara. This is for primarily for use by
tooling, but advanced users may use this to analyze sessions.")
(defprotocol IPersistentEventListener
(to-transient [listener]))
;; TODO: Handle add-accum-reduced
(defprotocol ITransientEventListener
(left-activate! [listener node tokens])
(left-retract! [listener node tokens])
(right-activate! [listener node elements])
(right-retract! [listener node elements])
(insert-facts! [listener node token facts])
(alpha-activate! [listener node facts])
(insert-facts-logical! [listener node token facts])
(retract-facts! [listener node token facts])
(alpha-retract! [listener node facts])
(retract-facts-logical! [listener node token facts])
(add-accum-reduced! [listener node join-bindings result fact-bindings])
(remove-accum-reduced! [listener node join-bindings fact-bindings])
(add-activations! [listener node activations])
(remove-activations! [listener node activations])
(fire-activation! [listener activation resulting-operations])
(fire-rules! [listener node])
(to-persistent! [listener]))
;; A listener that does nothing.
(deftype NullListener []
ITransientEventListener
(left-activate! [listener node tokens]
listener)
(left-retract! [listener node tokens]
listener)
(right-activate! [listener node elements]
listener)
(right-retract! [listener node elements]
listener)
(insert-facts! [listener node token facts]
listener)
(alpha-activate! [listener node facts]
listener)
(insert-facts-logical! [listener node token facts]
listener)
(retract-facts! [listener node token facts]
listener)
(alpha-retract! [listener node facts]
listener)
(retract-facts-logical! [listener node token facts]
listener)
(add-accum-reduced! [listener node join-bindings result fact-bindings]
listener)
(remove-accum-reduced! [listener node join-bindings fact-bindings]
listener)
(add-activations! [listener node activations]
listener)
(remove-activations! [listener node activations]
listener)
(fire-activation! [listener activation resulting-operations]
listener)
(fire-rules! [listener node]
listener)
(to-persistent! [listener]
listener)
IPersistentEventListener
(to-transient [listener]
listener))
(declare delegating-listener)
;; A listener that simply delegates to others
(deftype DelegatingListener [children]
ITransientEventListener
(left-activate! [listener node tokens]
(doseq [child children]
(left-activate! child node tokens)))
(left-retract! [listener node tokens]
(doseq [child children]
(left-retract! child node tokens)))
(right-activate! [listener node elements]
(doseq [child children]
(right-activate! child node elements)))
(right-retract! [listener node elements]
(doseq [child children]
(right-retract! child node elements)))
(insert-facts! [listener node token facts]
(doseq [child children]
(insert-facts! child node token facts)))
(alpha-activate! [listener node facts]
(doseq [child children]
(alpha-activate! child node facts)))
(insert-facts-logical! [listener node token facts]
(doseq [child children]
(insert-facts-logical! child node token facts)))
(retract-facts! [listener node token facts]
(doseq [child children]
(retract-facts! child node token facts)))
(alpha-retract! [listener node facts]
(doseq [child children]
(alpha-retract! child node facts)))
(retract-facts-logical! [listener node token facts]
(doseq [child children]
(retract-facts-logical! child node token facts)))
(add-accum-reduced! [listener node join-bindings result fact-bindings]
(doseq [child children]
(add-accum-reduced! child node join-bindings result fact-bindings)))
(remove-accum-reduced! [listener node join-bindings fact-bindings]
(doseq [child children]
(remove-accum-reduced! child node join-bindings fact-bindings)))
(add-activations! [listener node activations]
(doseq [child children]
(add-activations! child node activations)))
(remove-activations! [listener node activations]
(doseq [child children]
(remove-activations! child node activations)))
(fire-activation! [listener activation resulting-operations]
(doseq [child children]
(fire-activation! child activation resulting-operations)))
(fire-rules! [listener node]
(doseq [child children]
(fire-rules! child node)))
(to-persistent! [listener]
(delegating-listener (map to-persistent! children))))
(deftype PersistentDelegatingListener [children]
IPersistentEventListener
(to-transient [listener]
(DelegatingListener. (map to-transient children))))
(defn delegating-listener
"Returns a listener that delegates to its children."
[children]
(PersistentDelegatingListener. children))
(defn null-listener?
"Returns true if the given listener is the null listener, false otherwise."
[listener]
(instance? NullListener listener))
(defn get-children
"Returns the children of a delegating listener."
[^PersistentDelegatingListener listener]
(.-children listener))
;; Default listener.
(def default-listener (NullListener.))