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--- pub:software:heartdroid:tutorials:callbacks [2016/12/28 13:22]
admin [Compile and run]
+++ pub:software:heartdroid:tutorials:callbacks [2016/12/29 06:42]
admin [Actions]
@@ Line 94: / Line 94: @@
 ===== Actions =====
+Actions are based on the same concept as Callbacks.
+There are several differences though:
+  * Actions are associated with rules and are fired when the rule fires
+  * Each rule may have severl actions assigned
+  * Actions should implement Action interface, instead of Callback interface
+  * Action cannot modify the state of attributes, although have insight into the current state of the system (current values of all the attributes from the model)
+To add an action to your rule, use the ''<nowiki>**></nowiki>'' operator, like in the listing below:
+<code>
+xrule parkingReminder/1:
+  [
+     location eq pay_zone,
+     tariff eq pay
+  ]
+  ==>
+  [
+     notification set start_parking_fee
+  ]
+  **>
+  [
+    'ShowNotification',
+    'StartPayment'
+  ].#1
+</code>

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