AW: [rules-users] How to avoid circular rule activation for noncircular problems?

[Ralph Ammon]

Thank you Marcus,
with your constraint I got rid of the "no-loop true" and the endTime is
recalculated when needed. So my first problem is really solved!

So I tried a similar constraint for the rule "Calc StartTime with
redecessors" 

	rule "Calc StartTime with predecessors"
	    when
	        $t : Task(predecessorCount > 0, $predecessors : predecessors
)
	        forall ( 
	        			$succTask : Task( this == $t )
	        		 	$predTask : Task( this memberOf
$predecessors, endTime > 0 )
	        		)
	        $endTime : Number()
	      		from accumulate( $p : Task() from $predecessors, 
	
max($p.getEndTime()) )
			# new constraint
			Task(this == $t, eval($t.getStartTime() !=
$endTime.longValue()))
		then
			$t.setStartTime( $endTime.longValue() );
			System.out.println( "Drools: " + $t.toString() + "
has new StartTime" );
			# new update
			update( $t );
	end

The improvement is that I can do an update in the RHS without infinite
recursion. But the rule is still wrong, because it doesn't fire when the
maximum of predecessors endTimes changes. 

Best regards
Ralph