I believe the answer is that Drools implements sub-rule compilation for
rules containing "or".

So in essence your rulebase contains the following once compiled:-

rule "fire_twice_a"

       no-loop true
when
       eval(true)

then
       System.out.println("word");
end

rule "fire_twice_b"

       no-loop true
when
       eval(true)

then
       System.out.println("word");
end

-----Original Message-----
From: rules-users-bounces@lists.jboss.org
[mailto:rules-users-bounces@lists.jboss.org] On Behalf Of
sergey.olifirenko
Sent: 08 June 2009 13:39
To: rules-users@lists.jboss.org
Subject: Re: [rules-users] OR operator affects how many times Rule's
actionis executed


More simple example:


package continuated_rules

dialect "mvel"

rule "fire_twice"
       no-loop true
when
       eval(true) or eval(true)
then
       System.out.println("word");
end

output is:

word
word

why does it happens ?

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-is-executed-tp23910106p23923259.html
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