Decision table creation query
by Kripa Nathwani
Hello Admin,
I am new to Drools.
Kindly let me know the steps to create a decision table in Drools Guvnor.
Best Regards,
Kripa
Mail: Kripa.Nathwani(a)lntinfotech.com<mailto:Biswajit.Sahoo@lntinfotech.com>
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16 years, 2 months
Not able to create object in [then] clause in DSL using Guvnor
by bbarani
Hi,
I am trying to execute a simple DSL as below. Decisions is the bean class
which I have imported in to Guvnor
[when] IMRR action requested is in one of {acts} = Action(action in {acts})
[then] permitted =dec:Decisions dec.setDecision("Granted")
Now I want the object for decision to be created and the value set in a
single mapping. I tried the above code and got the error as below.
[NamedParameterRule] Unable to build expression for 'consequence':
java.lang.Class cannot be cast to org.mvel2.util.MethodStub '
System.out.println("Rule Fired From Guvnor");
dec: Decisions () dec.setDecision("Granted")'
If I create the object in [when] clause it works fine. Any idea when this
error would pop up?? and how to resolve this?
Thanks,
Barani
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16 years, 2 months
fireAllRules() - multiply times.
by Maverickthe6
Hey!
I'm new to drools-expert and try to modell the following situation:
- I have a ruleflow
- I want to collect data and all few seconds (like 10 seconds), I want to
execute fireAllRules(). (Called by a timer).
FireUntilHalt() is not an option, and in the situation above the following
"problem" arises:
I lost some facts, because in a new fireAllRules() run, some of these facts
wasn't touched anymore and therefore didn't set on the agenda once more. So
they will be only regarded in the first fireAllRules() run... But - of
course - I want the facts to be regarded once more in later turns. At the
moment, I update the facts (as last rule that fires) per ruleflow-group,
even if they haven't had been modified. This is..ehm.. not so nice ;) (but
helps..), and the question is now: what is the state-of-the-art to model
this?
And a question that comes along is, how can I design a rule, that has no
condition at the LHS and will be executed each time I call fireAllRules().
Thanks!
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16 years, 2 months
Invocation Patterns
by Kenneth May
I am new to Drools, but am an experienced programmer. I was hoping
somebody with some Drools Flow experience could advise on a good
approach for dealing with the following requirements:
1) A large number of XML files are received: perhaps one every few
seconds (or more frequently). Each time a file is received I want to
process these according to a pre-defined business process. For
example:
- Calling a web service using some data contained in the file to do a
calculation
- Writing to a database
- Copying the file to another directory
- Sending an email
- Logging progress
NB Some of the logic in the flow may vary depending on data within the
file which is being processed.
2) The business process may vary slightly depending on the nature of
the file being received. For example I have four file types: A,B,C
&D. I’d want to invoke 4 slightly different processes. Each of these
may have slight variations depending on the contents of the file.
3) The business processes may be changed occasionally, but usually not
drastically. This doesn’t need to be done dynamically.
I already have code which monitors a folder for new files. With
drools, I’m just not sure what the best pattern is for how to deal
with this in an efficient manner. I was thinking:
Each time a file is received:
- Do an initial parse to determine which business process to invoke,
each of these would be built as a separate drools flow
- Construct the knowledgebase, session etc
- Start the relevant flow
I’m pretty sure this isn’t the easiest or most efficient approach
though! Any thoughts?
Thanks,
Ken
16 years, 2 months
Invocation Patterns
by Kenneth May
You are correct, Drools Flow may not be the best choice of technology.
I could certainly write what is required in core Java very easily!
However, there are a few reasons why this was my intended approach:
1) A large degree of flexibility may be required in the future. I
like the concept of being able to change or apply new logic fairly
easily.
2) Out of the box business activity monitorring is appealing
3) I'm keen to explore BPM and rules technology in more depth
4) The discussion in this (admittedly old) article suggested jBPM may
be a good fit: http://community.jboss.org/wiki/JBossRulesjBPMSQLorJava.
My understanding is that Drools Flow is an alternative to jBPM and
from what I can tell has a far better integration with rules.
That said: I'm not adverse to alternative approaches if what I'm
planning doesn't sound like a good fit. What I need to do is
essentially pretty simple: take a file and process it through several
steps (with some logic deciding which steps are relevant).
Thanks for your help!
Ken
16 years, 2 months
Help : Enabling Role Base Authorization in Guvnor
by Han Ming Low
Hi all,
I try to enable the Role Base Authorization in Guvnor after it was running
fine with the default login mechanism.
But, encountered some problem with the attempt.
What I did was that in the components.xml,
- commented out the default <security:identity
authenticate-method="#{defaultAuthenticator.authenticate}"/>
- uncomment the <security:identity
authenticate-method="#{authenticator.authenticate}"
jaas-config-name="other"/>
- change the role base authorization to true,
<security:role-based-permission-resolver
enable-role-based-authorization="true"/>
And at the login-config.xml
I have changed the "other" application policy to
<application-policy name = "other">
<authentication>
<login-module code =
"org.jboss.security.auth.spi.UsersRolesLoginModule"
flag = "required" >
<module-option
name="usersProperties">props/guvnor-users.properties</module-option>
<module-option
name="rolesProperties">props/guvnor-roles.properties</module-option>
</login-module>
</authentication>
</application-policy>
guvnor-users.properties
admin=admin12
krisv=krisv
john=john
mary=mary
guvnor-roles.properties
admin=admin
krisv=admin,manager,user
john=admin,manager,user
mary=admin,manager,user
After restarting JBoss, I can login based on the user and password defined
in the guvnor-users.properties.
And, by changing the password in the properties, I verified that it is
taking in the value from the file itself.
However, when I login as user admin and tried to access the Administration |
User Permission or Event Log,
I'm prompt "Sorry, insufficient permissions to perform this action."
The error from the console is
11:15:36,046 INFO [STDOUT] ERROR 29-07 11:15:36,046
(LoggingHelper.java:error:76)
Service method 'public abstract java.util.Map
org.drools.guvnor.client.rpc.RepositoryService.listUserPermissions()
throws org.drools.guvnor.client.rpc.DetailedSerializationException'
threw an unexpected exception:
org.jboss.seam.security.AuthorizationException:
Authorization check failed for
permission[org.drools.guvnor.server.security.AdminType@bf7a4d,admin]
org.jboss.seam.security.AuthorizationException: Authorization check failed
for permission[org.drools.guvnor.server.security.AdminType@bf7a4d,admin]
at
org.jboss.seam.security.Identity.checkPermission(Identity.java:581)
at
org.drools.guvnor.server.ServiceImplementation.listUserPermissions(ServiceImplementation.java:2604)
.....
Checking on the org.drools.guvnor.server.security.RoleTypes code, the
available role should be
admin
analyst
analyst.readonly
package.admin
package.developer
package.readonly
Can anyone help to let me know what's wrong with my configuration?
Thanks.
Han Ming
16 years, 2 months
Need help to call method with input parameter and return type
by Sanjib Karmakar
Hi
I am new in drools. In my project I have to call the method define in xml
rule file using java
## Following is my rule xml
<?xml version="1.0" encoding="UTF-8"?>
<package name="com.sample"
xmlns="http://drools.org/drools-5.0"
xmlns:xs="http://www.w3.org/2001/XMLSchema-instance"
xs:schemaLocation="http://drools.org/drools-5.0 drools.org/drools-5.0.xsd">
<import name="com.skyfusion.dto.FlifoDTO" />
<global identifier="flifoDTO" type="com.skyfusion.dto.FlifoDTO" />
<function return-type="FlifoDTO" name="show">
<parameter identifier="appId" type="FlifoDTO.appId"/>
<body>
System.out.println("appId " + appId);
if(appId==2)
{
flifoDTO.setChnlName("SKYFUSION.UNI.SIMU.TXT.QUEUE");
}
if(appId==3)
{
flifoDTO.setChnlName("SKYFUSION.BASE.MSGFLTR.TXT.TOPIC");
}
</body>
</function>
<rule name="Find Channel">
<lhs>
<pattern identifier="flDTO" object-type="FlifoDTO" >
<field-constraint field-name="flifoType">
<qualified-identifier-restriction
evaluator="==">FlifoDTO.FLIFO</qualified-identifier-restriction>
</field-constraint>
<field-binding field-name="appId" identifier="ruleDTO"/>
</pattern>
</lhs>
<rhs>
//System.out.println(ruleDTO);
System.out.println("Find Channel");
//show(appId);
</rhs>
</rule>
</package>
## Following is my DTO class
package com.skyfusion.dto;
public class FlifoDTO
{
public static final int FLIFO = 1;
private String ruleId;
private int appId;
private int flifoType;
private String chnlName;
public FlifoDTO() {
}
public int getAppId() {
return appId;
}
public void setAppId(int appId) {
this.appId = appId;
}
public String getChnlName() {
return chnlName;
}
public void setChnlName(String chnlName) {
this.chnlName = chnlName;
}
public void setRuleId(String ruleId) {
this.ruleId = ruleId;
}
public String getRuleId() {
return ruleId;
}
public int getFlifoType() {
return flifoType;
}
public void setFlifoType(int flifoType) {
this.flifoType = flifoType;
}
}
## Following is my rule execution class
package com.skyfusion.rule.handler;
import org.drools.KnowledgeBase;
import org.drools.KnowledgeBaseFactory;
import org.drools.builder.KnowledgeBuilder;
import org.drools.builder.KnowledgeBuilderError;
import org.drools.builder.KnowledgeBuilderErrors;
import org.drools.builder.KnowledgeBuilderFactory;
import org.drools.builder.ResourceType;
import org.drools.io.ResourceFactory;
import org.drools.runtime.StatefulKnowledgeSession;
import com.skyfusion.dto.FlifoDTO;
public class RuleHandler {
private StatefulKnowledgeSession ksession = null;
private KnowledgeBase kbase = null;
public RuleHandler()
{
try {
// load up the knowledge base
kbase = readKnowledgeBase();
ksession = kbase.newStatefulKnowledgeSession();
} catch (Exception t) {
t.printStackTrace();
}
}
private KnowledgeBase readKnowledgeBase()
throws Exception
{
KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
kbuilder.add(ResourceFactory.newClassPathResource("fliforule.xml"),
ResourceType.XDRL);
KnowledgeBuilderErrors errors = kbuilder.getErrors();
if (errors.size() > 0) {
for (KnowledgeBuilderError error: errors) {
System.out.println(error);
}
throw new IllegalArgumentException("Could not parse knowledge.");
}
KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());
return kbase;
}
public FlifoDTO initMessage(String ruleID, FlifoDTO flDTO, int appId, int
type)
throws Exception
{
FlifoDTO flifoDTO = flDTO;
try
{
flifoDTO.setRuleId(ruleID);
flifoDTO.setAppId(appId);
flifoDTO.setFlifoType(type);
ksession.insert(flifoDTO);
ksession.fireAllRules();
}catch(Exception t)
{
t.printStackTrace();
}
return flifoDTO;
}
public static void main(String args[]){
RuleHandler rh = new RuleHandler();
FlifoDTO flifoDTO = new FlifoDTO();
try {
flifoDTO = rh.initMessage("Find Channel",flifoDTO,2,1);
} catch (Exception e) {
e.printStackTrace();
}
System.out.println(flifoDTO.getChnlName());
}
}
## I am getting the following exception
java.lang.IllegalArgumentException: Could not parse knowledge.
at
com.skyfusion.rule.handler.RuleHandler.readKnowledgeBase(RuleHandler.java:45)
at com.skyfusion.rule.handler.RuleHandler.<init>(RuleHandler.java:28)
at com.skyfusion.rule.handler.RuleHandler.main(RuleHandler.java:71)
java.lang.NullPointerException
at com.skyfusion.rule.handler.RuleHandler.initMessage(RuleHandler.java:61)
at com.skyfusion.rule.handler.RuleHandler.main(RuleHandler.java:74)
(null: 29, 54): schema_reference.4: Failed to read schema document
'drools.org/drools-5.0.xsd', because 1) could not find the document; 2) the
document could not be read; 3) the root element of the document is not
<xsd:schema>.
(null: 31, 60): schema_reference.4: Failed to read schema document
'drools.org/drools-5.0.xsd', because 1) could not find the document; 2) the
document could not be read; 3) the root element of the document is not
<xsd:schema>.
(null: 34, 7): schema_reference.4: Failed to read schema document
'drools.org/drools-5.0.xsd', because 1) could not find the document; 2) the
document could not be read; 3) the root element of the document is not
<xsd:schema>.
Error importing : 'com.sample.Show.show'
[ show : unable to resolve type while building function
]
[ show : Function Compilation error
show (line:-2): FlifoDTO.appId cannot be resolved to a type
show (line:3): flifoDTO cannot be resolved
show (line:7): flifoDTO cannot be resolved
]
[ show : Function Compilation error
show (line:-2): FlifoDTO.appId cannot be resolved to a type
show (line:3): flifoDTO cannot be resolved
show (line:7): flifoDTO cannot be resolved
]
Rule Compilation error : [Rule name='Find Channel']
com/sample/Rule_Find_Channel_0.java (2:89) : The import com.sample.Show
cannot be resolved
Error importing : 'com.sample.Show.show'
null
## Please let me know I am missing.
Thanks in advance
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16 years, 2 months
Guvnor BRL format
by Sreenath Putta
Hi,
I have couples of questions regarding Guvnor BRL format:
We have a requirement to store the rules in XML format, for that we are
planning to use Guvnor Brl format.Right now Guvnor BRL format does not
support for defining Event correlation part (Temporal reasoning part). we
would end up something like putting these event correlation part in a
freeform.
First thing is will there be any support for event correlation in Guvnor in
near future?
If not we are willing to contribute for that effort. we just wanted to find
out what exactly is the process for going forward and defining these
elements?
Thanks,
Sreenath
16 years, 2 months
Failed to read schema document when trying to transform from XML to DRL
by Chang Liu
Hi there,
Error message:
(null: 5, 77): schema_reference.4: Failed to read schema document 'drools.org/drools-5.0.xsd', because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>.
I ran into this issue when experimenting a project that transforming the rules back and forth from DRL to XML with utility classes as documented in following link:
http://downloads.jboss.com/drools/docs/5.0.1.26597.FINAL/drools-expert/ht...
My code:
...
XmlPackageReader xmlReader = new XmlPackageReader(null);
StringReader sr = new StringReader(rulesInXml);
try {
PackageDescr packageDescr = xmlReader.read(sr);
DrlDumper drlDumper = new DrlDumper();
String drlString = drlDumper.dump(packageDescr);
}
catch (Exception ex) {
System.out.println(ex);
}
...
where string "rulesInXml" is the result xml string transformed from a valid .drl file. It looks like:
<?xml version="1.0" encoding="UTF-8"?>
<package name="com.sample"
xmlns="http://drools.org/drools-5.0"
xmlns:xs="http://www.w3.org/2001/XMLSchema-instance"
xs:schemaLocation="http://drools.org/drools-5.0 drools.org/drools-5.0.xsd">
<import name="com.sample.DroolsTest.Message" />
<rule name="Hello World">
<lhs><pattern identifier="m" object-type="Message" >
<field-constraint field-name="status">
<qualified-identifier-restriction evaluator="==">Message.HELLO </qualified-identifier-restriction>
</field-constraint>
<field-binding field-name="message" identifier="myMessage" />
</pattern>
</lhs>
<rhs> System.out.println( myMessage );
m.setMessage( "Goodbye cruel world" );
m.setStatus( Message.GOODBYE );
update( m );
</rhs>
</rule>
<rule name="GoodBye">
<lhs><pattern object-type="Message" >
<field-constraint field-name="status">
<qualified-identifier-restriction evaluator="==">Message.GOODBYE </qualified-identifier-restriction>
</field-constraint>
<field-binding field-name="message" identifier="myMessage" />
</pattern>
</lhs>
<rhs> System.out.println( myMessage );
</rhs>
</rule>
</package>
What did I miss here?
Moreover, the Drools 5.0 API's for XML support are poorly-documented. For example, the constructors of class "XmlPackageReader" has an arg of "SemanticModules" type which is not documented. :(
Any help would be highly appreciated!
Thanks,
Chang
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16 years, 2 months
