21.5. Fibonacci Example: Bootstrap Rule

rule Bootstrap
    when
        f : Fibonacci( sequence == 1 || == 2, value == -1 ) // multi-restriction
    then 
        modify ( f ){ value = 1 };
        System.out.println( f.sequence + " == " + f.value );
end
  • When a Fibonacci object with a sequence field of 2 is asserted the Bootstrap rule is matched and activated along with the Recurse rule.
  • Note the multi-restriction on field sequence, testing for equality with 1 or 2.
  • When a Fibonacci object with a sequence of 1 is asserted the Bootstrap rule is matched again, causing two activations for this rule. The Recurse rule does not match and activate because the not conditional element stops the rule's matching as soon as a Fibonacci object with a sequence of 1 exists.
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