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Drools Deep Dive

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A method must be called directly ... … specifying the argument passed to it A rule cannot be called directly Specific instances cannot be passed but are automatically selected with pattern-matching

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Core Engine

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Entry-point All facts are inserted here Type Nodes Discriminate on fact type Alpha Network Evaluate Terminal Nodes Put activated rule into the agenda Beta Network Evaluate

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INACTIVE FIRING_ALL_RULES FIRING_UNTIL_HALT endFiring fireAllRules / fireUntilHalt fireUntilHalt FORCE_HALTING halt REST_HALTING tryHalt tryHalt endFiring fireUntilHalt EXECUTING_TASK fireAllRules executeTask endExecution FIRING or REST_HALTING PropagationQueue yes => enqueue no => execute WAIT fireAllRules fireAllRules

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Indexes and reactivity explicitly defined

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● ● ● ● ○ ○ ● ● RULES

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