Plz reply : Descending order rule
by barath gunasagaran
Hi,
Can u explain me the rule flow for the below rule ?.
This will help me to get some clear idea about rules.
rule "Descending order"
when
$a : Order( $value : value )
not Order( value > $value)
then
System.out.println("value :"+$value);
retract($a);
end
I am having the following ,
1. Order value=1
2. Order value=2
3. Order value=3
4. Order value=4
5. Order value=5
Can u explain the flow(when part) for this 5 object ?
Note my understanding(in when) : 1st line take one order object
2nd line check for
any other object with grater 'value'
But i dont know
sequence in which the objects are taken.
Plz do reply......
Thanks in advance,
Barath.
17 years, 10 months
Packages using, drools-ant vs. brms?
by Małecki
Hi
How to correct load packages generated by drools-ant?
I got no problem with importing packages from brms.
I try method below. Rules are loaded but not all are executed as in
classic java test.
File pkgFile = new File("c:/(...)/drools_test.rules.pkg");
ObjectInputStream in = new
DroolsObjectInputStream(newFileInputStream(pkgFile));
RuleBase p1_ = (RuleBase) in.readObject();
Second test (below) give me error
"org.drools.compiler.PackageBuilder$MissingPackageNameException:
Missing package name for rule package."
ObjectInputStream is = new DroolsObjectInputStream(new
FileInputStream(pkgFile));
RuleBaseLoader loader = RuleBaseLoader.getInstance();
RuleBase ruleBase = loader.loadFromReader(new InputStreamReader(is));
Any solution?
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17 years, 10 months
modifying individual facts in rule drl file
by Mehak
Hi
I am using drool to put my application business logic
In my java service class, I am adding into an ArrayList objects: task1,task2
and task3.
list.add(task1);
list.add(task2);
list.add(task3);
new RuleRunner().runRules(new String[] { "ruleTraverseFacts.drl" }, list);
Code in the RuleRunner class is :
public void runRules(String[] rules, ArrayList facts) throws Exception {
// RuleBase contains the rules to be applied to facts
RuleBase ruleBase = RuleBaseFactory.newRuleBase();
PackageBuilder builder = new PackageBuilder();
for (int i = 0; i < rules.length; i++) {
String ruleFile = rules[i];
System.out.println("Loading file: " + ruleFile);
builder.addPackageFromDrl(new
InputStreamReader(RuleRunner.class
.getResourceAsStream("/BusinessRules/" + ruleFile)));
}
Package pkg = builder.getPackage();
ruleBase.addPackage(pkg);
//Facts are inserted in the working Memory of the ruleBase
WorkingMemory workingMemory = ruleBase.newStatefulSession();
Collection factList=new ArrayList();
for (int i = 0; i < facts.size(); i++) {
Object fact = facts.get(i);
System.out.println("Inserting fact: " +
fact.toString());
factList.add(workingMemory.insert(fact));
}
In my .drl class I have defined rules:
package BusinessRules
import model.*
import java.util.*
rule "traverse Collection"
when
$o1 : Task($child : childTasks , childTasks != null)
then
$o1.setWorkHours((getRollUp($child)) + $o1.getWorkHours());
update($o1);
System.out.println("estimated hours" + $o1.getWorkHours());
retract($o1);
end
function int getRollUp(ArrayList child) {
//some code
}
What I would want to do is identify and manipulate individual objects in the
working memory.
like task1.getId();.
All the rules in the drl file are applied to all the facts in working
memory. How can I access individual objects without specifying any
condition?
--
View this message in context: http://www.nabble.com/modifying-individual-facts-in-rule-drl-file-tp15605...
Sent from the drools - user mailing list archive at Nabble.com.
17 years, 10 months
Question about managing working memory facts
by Zoltan Farkas
I am looking to implement a system that has as facts "events" that happen randomly.
How is the best way to implement a "garbage collection" mechanism that if the number of "events" in the working memory reaches a limit value will retract the oldest event/s.
Thanks
--zoly
17 years, 10 months
OR condition in decision tables
by Mahesh Gadgil
Hi ALL, This is my first project on drools. I am using JBOSS rules 4.0.4 and wouldlike your help. I want to create a spreadsheet that will compile into drl file. I can notfigure out how I could create an OR condition in the spreadsheet. The drlcode I am looking to get finally will look like this. The documentation on JBOSS site does not provide any examples of OR condition in a spreadsheet. WHEN applicant : Applicant(applicantType == "authenticated" ||applicantType == "existing")............THEN applicant.setfundingType(internal") END. Thanking you in advanceMahesh
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17 years, 10 months
drools parser loops infinitely.
by Godmar Back
Hi,
here's a simple test for which Drools 4.0.4 w/ MVEL 1.4 loops infinitely:
----
package tests;
import java.util.Map;
import java.io.File;
dialect "mvel"
rule "Rule #1"
when
p : Map (this["path"] matches File.separator);
then
System.out.println("cgi path " + p.path);
end
----
It appears to be related to the use of static String variable on the
rhs of the match clause.
- Godmar
17 years, 10 months
drools fails to parse Array literals correctly when using MVEL
by Godmar Back
Consider this test:
---
package tests;
import java.lang.reflect.Method;
dialect "mvel"
rule "Rule #1"
when
then
Class clazz = Class.forName("java.lang.Class");
System.out.println("clazz = " + clazz);
Method m = clazz.getDeclaredMethod("forName", new Class [] {
java.lang.String.class });
System.out.println("m = " + m);
end
--
(which runs correctly when dialect "java" is given), fails in Drools
4.0.4/MVEL 1.4 with:
org.mvel.CompileException: could not create constructor:
java.lang.Class.<init>()
at org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeObjectCreation(ReflectiveAccessorOptimizer.java:688)
at org.mvel.ast.NewObjectNode.getReducedValueAccelerated(NewObjectNode.java:191)
at org.mvel.MVELRuntime.execute(MVELRuntime.java:88)
at org.mvel.CompiledExpression.getValue(CompiledExpression.java:111)
at org.mvel.CompiledExpression.getValue(CompiledExpression.java:106)
at org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.getMethod(ReflectiveAccessorOptimizer.java:521)
at org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:260)
at org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeAccessor(ReflectiveAccessorOptimizer.java:109)
at org.mvel.ast.VariableDeepPropertyNode.getReducedValueAccelerated(VariableDeepPropertyNode.java:29)
at org.mvel.ast.PropertyASTNode.initializePropertyNode(PropertyASTNode.java:77)
at org.mvel.ast.PropertyASTNode.getReducedValueAccelerated(PropertyASTNode.java:26)
at org.mvel.ExecutableAccessor.getValue(ExecutableAccessor.java:45)
at org.mvel.ast.TypedVarNode.getReducedValueAccelerated(TypedVarNode.java:43)
at org.mvel.MVELRuntime.execute(MVELRuntime.java:88)
at org.mvel.CompiledExpression.getValue(CompiledExpression.java:111)
at org.mvel.MVEL.executeExpression(MVEL.java:235)
at org.drools.base.mvel.MVELConsequence.evaluate(MVELConsequence.java:47)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:550)
at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:514)
at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:471)
at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:433)
at org.libx.autodetect.DroolsDriver$Host.fireAllRules(DroolsDriver.java:63)
at org.libx.autodetect.DroolsDriver.main(DroolsDriver.java:136)
It appears to be looking for a constructor for "new java.lang.Class()"
rather than constructing an array.)
Similarly, "o.method(new String [] { ... })" fails because it looks
for a method taking a String, rather than String[].
- Godmar
17 years, 10 months
"unable to resolve token" in simple mvel RHS
by Godmar Back
Hi,
with Drools 4.0.4 and MVEL 1.4, simple RHS like this one fail for me:
---
package test;
dialect "mvel"
rule "Rule #1"
when
then
System.out.println("now computing 1+1...");
Integer two = new Integer(2);
System.out.println(two);
end
---
now computing 1+1...
org.mvel.CompileException: unable to resolve property: two
at org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:288)
at org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeAccessor(ReflectiveAccessorOptimizer.java:109)
at org.mvel.ast.ContextDeepPropertyNode.getReducedValueAccelerated(ContextDeepPropertyNode.java:26)
at org.mvel.ast.PropertyASTNode.initializePropertyNode(PropertyASTNode.java:123)
at org.mvel.ast.PropertyASTNode.getReducedValueAccelerated(PropertyASTNode.java:26)
at org.mvel.ExecutableAccessor.getValue(ExecutableAccessor.java:45)
at org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.getMethod(ReflectiveAccessorOptimizer.java:521)
at org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:260)
at org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeAccessor(ReflectiveAccessorOptimizer.java:109)
at org.mvel.ast.LiteralDeepPropertyNode.getReducedValueAccelerated(LiteralDeepPropertyNode.java:28)
at org.mvel.MVELRuntime.execute(MVELRuntime.java:88)
at org.mvel.CompiledExpression.getValue(CompiledExpression.java:111)
at org.mvel.MVEL.executeExpression(MVEL.java:235)
at org.drools.base.mvel.MVELConsequence.evaluate(MVELConsequence.java:47)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:550)
at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:514)
at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:471)
at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:433)
at org.libx.autodetect.DroolsDriver$Host.fireAllRules(DroolsDriver.java:63)
at org.libx.autodetect.DroolsDriver.main(DroolsDriver.java:136)
Caused by: org.mvel.PropertyAccessException: unable to resolve property: two
at org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.getBeanProperty(ReflectiveAccessorOptimizer.java:382)
at org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:257)
... 19 more
org.mvel.CompileException: unable to resolve token: two
at org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:297)
at org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeAccessor(ReflectiveAccessorOptimizer.java:109)
at org.mvel.ast.LiteralDeepPropertyNode.getReducedValueAccelerated(LiteralDeepPropertyNode.java:28)
at org.mvel.MVELRuntime.execute(MVELRuntime.java:88)
at org.mvel.CompiledExpression.getValue(CompiledExpression.java:111)
at org.mvel.MVEL.executeExpression(MVEL.java:235)
at org.drools.base.mvel.MVELConsequence.evaluate(MVELConsequence.java:47)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:550)
at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:514)
at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:471)
at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:433)
at org.libx.autodetect.DroolsDriver$Host.fireAllRules(DroolsDriver.java:63)
at org.libx.autodetect.DroolsDriver.main(DroolsDriver.java:136)
Caused by: org.mvel.UnresolveablePropertyException: unable to resolve token: two
at org.mvel.ast.PropertyASTNode.initializePropertyNode(PropertyASTNode.java:127)
at org.mvel.ast.PropertyASTNode.getReducedValueAccelerated(PropertyASTNode.java:26)
at org.mvel.ExecutableAccessor.getValue(ExecutableAccessor.java:45)
at org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.getMethod(ReflectiveAccessorOptimizer.java:521)
at org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:260)
... 12 more
Caused by: org.mvel.CompileException: unable to resolve property: two
at org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:288)
at org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeAccessor(ReflectiveAccessorOptimizer.java:109)
at org.mvel.ast.ContextDeepPropertyNode.getReducedValueAccelerated(ContextDeepPropertyNode.java:26)
at org.mvel.ast.PropertyASTNode.initializePropertyNode(PropertyASTNode.java:123)
... 16 more
Caused by: org.mvel.PropertyAccessException: unable to resolve property: two
at org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.getBeanProperty(ReflectiveAccessorOptimizer.java:382)
at org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:257)
... 19 more
etc.
It appears to be related to the use of MVEL - the same rule with
'dialect "java"' executes correctly.
- Godmar
17 years, 10 months
Pattern matching
by Jai Vasanth
Hi,
What is the difference between the following 2 statements
stmt1 : FactA( attrib1 == "X" || attrib1 =="Y")
stmt2: FactA( attrib1 =="X") or FactA(attrib1 =="Y")
Thanks
Jai
17 years, 10 months
