check if a Enum object is present in condition
by Martin A
Hello,
I try to put a condition in my LHS, such as:
rule "initial_playground_dialog"
#agenda-group "firstTimeUser"
#salience 99
when
$gst :
GameStateController(!hasEventOccurred("initial_playground_dialog"))
$list : List()
$screen : FrontendScreen.PLAYGROUND
then
....
end
where 'FrontendScreen' is an enum and PLAYGROUND is its property. However I
get a syntax error. What's the proper way to check for and assign such a
session object?
Any help is appreciated!
Best regards,
Martin
15 years
Rule content keyword search
by GPatel＠tsys.com
Is it possible to perform keyword search within rule content? For example:
show me all rules that contain the word "person".
Thanks
G. Patel
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15 years
Problem in adding a Class to PKG
by DerLonG
Hi,
I have a problem when i compile a spreadsheet into a PKG. Hope you can
help me.
(Bevor this i used Guvnor to create a PKG from Spreadsheet, but i decide to
do this by my own)
The question is, how do I add this class to the package builder?
This is my Programm:
public static void main(String[] args) {
try {
final SpreadsheetCompiler converter = new SpreadsheetCompiler();
FileInputStream fis = new FileInputStream(new
File("E:\\temp\\myfirstDecTable.xls"));
final String drl = converter.compile(fis, InputType.XLS);
PackageBuilder builder = new PackageBuilder();
builder.addPackageFromDrl(new StringReader(drl));
Package pkg = builder.getPackage();
} catch (Exception e) {
System.out.println("Error: " + e);
}
}
The Exception:
java.lang.ClassNotFoundException: Unable to find class 'KundenEntscheidung'
at
org.drools.base.ClassTypeResolver.resolveType(ClassTypeResolver.java:215)
at
org.drools.compiler.PackageBuilder.mergePackage(PackageBuilder.java:1002)
at org.drools.compiler.PackageBuilder.newPackage(PackageBuilder.java:971)
at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:684)
at
org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:336)
at de.ceg.tools.drools.xlsCompiler.main(xlsCompiler.java:48)
java.lang.ClassNotFoundException: Unable to find class 'KundenEntscheidung'
at
org.drools.base.ClassTypeResolver.resolveType(ClassTypeResolver.java:215)
at
org.drools.compiler.PackageBuilder.mergePackage(PackageBuilder.java:1002)
at org.drools.compiler.PackageBuilder.newPackage(PackageBuilder.java:971)
at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:684)
at
org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:336)
at de.ceg.tools.drools.xlsCompiler.main(xlsCompiler.java:48)
Yours faithfully,
DerLonG
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15 years
using variables in eval
by rahulkrishnan
Hi
1.i have a rule like this
rule "Function Call"
dialect "mvel"
when
PassThrough( $c : name)
eval(($c = hello("rahul"))!=null)
then
System.out.println($c);
end
in this my function will return the string as capital and am entering to
the consequence part but the $c is printed as null. am not getting what is
happend.
And if i want to assign the result of function call to a String declared as
(String s) how can it be done
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15 years
[planner] Performance question
by Guilherme Kunigami
Consider I have a set of N activities with a given start and end times and I
want to assign them to a set of rooms.
One of the main rules is to avoid two activities that have time conflicts,
to be assigned to the same room. I devised three modelling options:
[1] Do it entirely in Java code, checking whether there will be a conflict
before allowing an "Assignment move". This way, all solutions that the
algorithm works with are feasible.
[2] Do it using drools rules, like the following:
rule "Avoid conflicting activities"
when
Assignment($room1: room, $act1: activity, $id : activity.id)
Assignment(room == $room1, room!= null, $act2 : activity, activity.id >
$id)
eval(Activity.conflict($act1, $act2))
then
insertLogical(new IntConstraintOccurrence("conflictingActivities",
ConstraintType.NEGATIVE_HARD,
10, null));
end
Here I'm using Assignment as the only planning entity. There's an assignment
for each activity and it may point to a room or to null in the case the
activity is not assigned. In the case above, I have a static function that
checks whether two activities conflicts. This way, solutions may be
infeasible but with high penalties the best solution found will eventually
be feasible.
I also thought of a third option, which is to insert a fact "Conflict" for
each pair of conflicting activities in a preprocessing phase. This way we
would end up with:
rule "Avoid conflicting activities"
when
Assignment($room1 : room, $act1: activity, $id : activity.id)
Assignment(room== $room1, room != null, $act2 : activity, activity.id > $id)
Conflict(act1 == $act1, act2 == $act2)
then
insertLogical(new IntConstraintOccurrence("conflictingActivities",
ConstraintType.NEGATIVE_HARD,
10, null));
end
The problem is that there may be up to O(N^2) such objects.
I do not know the rules engine algorithm in depth, so I'd like to know: Is
any of these approaches more efficient than the others?
Thanks!
15 years
drools persistence contract
by Michal Bali
Hi all,
When persisting a session, process instance or workitem, Drools persists
some parts of the state as byte arrays.
I am trying to upgrade from 5.1 to 5.3 and I have some existing
sessions/processes persisted in the database. I am wondering if it is safe
to upgrade? Will the bytearrays created by 5.1 work fine with 5.3?
Is there any document describing persistence compatibility between versions?
I don’t see much in the “new and noteworthy” in relation to persistence.
Thanks.
Keep up the good work!
Best regards,
Michal
15 years
KnowledgeBuilder.add(Resource, ResourceType) thread problem?
by chriscarr
I have a rules server that will handle executing different flows as requests
come in. For each thread, the following snippet is used:
final KnowledgeBuilder builder =
KnowledgeBuilderFactory.newKnowledgeBuilder();
final Resource resource =
ResourceFactory.newClassPathResource(bpmnFile, Foo.class);
builder.add(resource, ResourceType.BPMN2);
if (builder.hasErrors())
System.out.println....
Unfortunately, it reports an error when there are simultaneous threads in
the "add" method of their respective builders.
This appears using Windows XP, Drools 5.1.1 and 5.2.0.Final, and either JDK
1.5 or 1.6. Attached is a small command-line project to reproduce the
problem.
-----------
Environment
-----------
OS: Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.
DOWNLOAD: http://www.jboss.org/drools/downloads.html -->
droolsjbpm-tools-distribution-5.2.0.Final.zip
JAVA: java version "1.6.0_24"
Java(TM) SE Runtime Environment (build 1.6.0_24-b07)
Java HotSpot(TM) Client VM (build 19.1-b02, mixed mode, sharing)
java version "1.5.0_19"
Java(TM) 2 Runtime Environment, Standard Edition (build
1.5.0_19-b02)
Java HotSpot(TM) Client VM (build 1.5.0_19-b02, mixed mode,
sharing)
------------------------------
Output from Drools 5.2.0.Final
------------------------------
This is the output that I was able to create on subsequent runs of the test
harness. The errors are different combinations of (but no limited to) the
messages below.
Message(s):
Process 'simple bpmn process #1' [simple.flow.id.one]: Process has no
start node. {where the "process" may vary}
Process 'simple bpmn process #2' [simple.flow.id.two]: Process has no
end node. {where the "process" may vary}
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15 years
