Drools Expert
Code Examples
Flexible use of field constraint connectives:
Person(age > 30 && < 40 || hair == "black")
Auto vivification of field constraints in evals and return value constraints, without previous bindings to the field:
Cheese(newPrice == ( oldPrice * 1.10 ))
Supports both infix and prefix and/or conditional elements:
Person(name == "matthew") or Person(name == "john")
(or Person(name == "matthew") Person(name == "john") )
Field constraints on bound pattern's fields, without having to explicitly bind the field first:
p: Person() i: Item(id == p.id, value > 100)
Map accessor:
Person(pets["rover"].type == "dog")
Forall:
forall(Bus (color=="red"))
From used to reason over a nested collection:
$owner : Person( name == "mark" ) Pet( name == "rover" ) from $owner.pets
From used to reason over an expression result:
$zipCode : ZipCode() Person( ) from $hbn.getNamedQuery("Find People") .setParameters( [ "zipCode" : $zipCode ] ) .list()
From used to constrain the results of an accumulate
Number( intValue > 100 ) from accumulate( Bus( color == "red", $t : takings ), sum( $t ) )
Advanced syntaxing showing the nesting of conditional elements using from using from
$zipCode : ZipCode() $list : Number( intValue > 100 ) from accumulate( Bus( color == "red", $t : takings ) from $hbn.getNamedQuery("Find Buses") .setParameters( [ "zipCode", $zipCode ] ) .list(), sum( $t ) )
Eclipse authoring with DSL code completion
Side by side ruleflow authoring with rules
Interactive Debugging
Guided Editor
Decision Tables
