7 a.m.
Hi All,
Please help on this issue
I created a declarative model Person in personDetails package in Drools
Gunvor with 2 fields(age,amount).Now,I need to insert one field with name
gender and datatype String into that declarative model through POJO
class..Here is my code
RuleAgent agent = RuleAgent.newRuleAgent("/Guvnor.properties");
RuleBase rb = agent.getRuleBase();
WorkingMemory workingMemory = rb.newStatefulSession();
PackageBuilder pkgBuilder=new PackageBuilder(rb);
FactType personType = rb.getFactType( "persondetails.Person" );
ClassDefinition cDefinition=(ClassDefinition)
rb.getFactType("persondetails.Person");
FieldDefinition gen = new FieldDefinition( "gender",
"java.lang.String" );
product.setKey(true);
cDefinition.addField(product);
workingMemory.insert(cDefinition);
FactHandle fc=workingMemory.getFactHandle(cDefinition);
workingMemory.update(fc, cDefinition);
rb.newStatelessSession().execute(new Object[] {cDefinition});
}
String s1=cDefinition.getField(0).getTypeName();
String name1=cDefinition.getField(0).getName();
System.out.println(s1);
System.out.println(name1);
String s2=cDefinition.getField(1).getTypeName();
String name2=cDefinition.getField(1).getName();
System.out.println(s2);
System.out.println(name2);
String s3=cDefinition.getField(2).getTypeName();
String name3=cDefinition.getField(2).getName();
System.out.println(s3);
System.out.println(name3);
Output as Age---Java.lang.Integer
Amount-java.lang.Integer
Gender--Java.lang.String..
And when i am printing
It is executing successfuly first time without errors.but i could not find
gender in declarative model.It is failed to inserting.Can anyone help me in
this..plZzzzzz...I was struggling with this....
When Iam executing second time it is displaying as Exception:couldnot find
gender in declarative model..It means iam unable to commit Data into
Server..(Drools guvnor Model)
Please help on this....
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7:43 a.m.
Hi,
what you are trying to do is potentially very dangerous. When you declare a
type, Drools (re)creates a class on the fly whenever the package is compiled
to be added to a knowledge base.
Adding a field and reloading the class implies that any previously
instantiated object (or even
rule pattern!) will no longer be compatible with the new instances.
So, I wonder if you must do it online at all... can't you just go and modify
the declared model?
Moreover, the way you are trying to apply the modifications to the
ClassDefinition is wrong.
Indeed you have added a field definition to the definition, but the engine
will not be aware of
this change by simply inserting the definition in some session.
You should either use very low level APIs to "patch" the knowledgebase or
pass a Resource containing
the updated definition to the knowledge agent.
But again, I would not recommend it unless you absolutely must do it
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8:02 a.m.
Really Thank you Davidde for your reply.Yes,As you said,I can go to
declarative model and i can add the fields..But,I need it as dynamically.For
example,when user enters the field and Datatype it must be inserted into
FactModel.
By your reply,I came to know that it is not correct way to do it.How can i
insert that field to Declarative Model..Is it possible???in
Drools5.0..Please help me..Once again Thank you for your reply..Really
Thanks
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8:46 a.m.
The main issue here is whether you need to "hot-swap" the class definition or
not.
In the best scenario, you have two independent sub-applications: one is
managing the
fact type, the other is using it, and the two never run together.
In this case, you could just declare your datatype in a separate DRL file,
created programmatically.
The syntax is trivial enough:
package myPackage;
declare YourClass
field1 : type1
...
fieldN : typeN
end
Then, you can upload/update the resource in Guvnor: the next time your
package is compiled,
you will see the latest version of the fact type.
(sorry, but I dont' remember DroolsGuvnor 5.0 APIs, so this is all I can
tell you)
-----------
IF, instead, you have to modify the class AS YOU ARE using it, e.g.:
when Person( name == "x" ) then /* add field gender to Person */ end
then let me know, but the drawbacks might be more than the benefits.
Instances of the "old" version
will not be compatible with instances of the "new" one... Rules will likely
be updated as well, so they
would no longer work with the "old" facts. You'd have to manage the
migration manually.
You might as well opt for a completely dynamic data model? Uglier and you
lose strict typing, I know...
declare Person
attributes : Map
end
you'd have to change the way you write your rules, and I'm not sure that 5.0
already supported this:
Person( name == "x" ) ----> Person( attributes["name"] ==
"x" )
Consider also that 5.0 is a quite old version, many features related to this
functionality have been corrected and added in later versions
----
Btw, what's exactly the point in adding a field? Are you also adding rules
using that additional field?
Could you please provide more details on your app and requirements?
Thanks
D
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11:07 p.m.
Really Thanks for your valuable answers and support Davidde.The context where
I'm struggling is,I will explain you clearly.
I have a Declarative Model named Person with two Fact fields
Age,Amount.Now,I can add another fact field Gender here(By opening
console,Add fact field).But,I need it as dynamically.It means,Whenever name
of the attribute and type (gender-String)is passed to Eclipse drools
Project,that class must be executed and that gender with datatype String
must be inserted into Model Present in Drools Guvnor console.
Which Predefined Classes I must use to achieve this..Can you please guide me
in this to get rid of this issue..
Thanks in Advance Davidde..
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4:38 a.m.
Hi Davidde,
Let me explain our requirements in the lines below.
-----------------------------------------------------------------------------------------------
We are developing our CRM Application using Liferay portals. This
application would be used by the end users of the Bank/Telecom companies. We
intend to provide configuration of rules by the end users using Drool's
Guvnor, but what we don't want them to do is adding of facts directly in
declarative model.
We would like to control this creation from Application Front end (developed
in Liferay). In the front end we would be providing options to add new facts
(AGE, Income, Occupation) and associate with Customer's Profile. The moment
we add this, the same should be available in Drools Guvnor for configuring
new rules.
Hence we are looking at some kind of API/Webservices using which we can
create the facts. We would not give either modify/delete operation from our
Application GUI.
-----------------------------------------------------------------------------------------------
Thanks for valuable suggestions previously which you have given.Please give
us your valuable inputs to solve this problem.Once again Thank you for ur
support and guidance.
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2:40 p.m.
I would include the "declarations" in a "technical asset" and update
it from
your front-end gui.
This, in conjunction with a knowledge-agent to monitor resource changes in
guvnor.
Remember that, while feasible for new sessions, it is quite dangerous to
modify declared types when there exist active sessions
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12:28 a.m.
Hi David,
Let me explain our requirement in a better picture through the
images.Image1: http://drools.46999.n3.nabble.com/file/n3563593/Capture.png
Now,My requirement is to add new field.For this,as shown in the below
image Image2:
http://drools.46999.n3.nabble.com/file/n3563593/Capture11.png I would add
the field by "Add Field" option located in that respective model(as shown in
the Image2).
Our requirement is to add these fields using our Application front end into
the Drools Engine. We are looking for some APIs exposed by Drools to create
these facts from Portal Application.
I thank you for advising me and giving suggestions so far.
Thanks
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1:40 a.m.
Guvnor's screens to define a declarative Fact Model simply generate DRL.
Guvnor isn't as dynamic as the use-case you describe and hence we don't
have the same issues.
The API is what has already been discussed: create a DRL, use
KnowledgeBuilder or KnowledgeAgent to load these resources into your
application.
There is a private API in Guvnor used to transform its model into DRL. If
this is what you seek please advise and I'll dig out some class names.
With kind regards,
Mike
On 6 December 2011 06:28, srinivasasanda <srinivasasanda(a)gmail.com> wrote:
Hi David,
Let me explain our requirement in a better picture through the
images.Image1: http://drools.46999.n3.nabble.com/file/n3563593/Capture.png
Now,My requirement is to add new field.For this,as shown in the below
image Image2:
http://drools.46999.n3.nabble.com/file/n3563593/Capture11.png I would add
the field by "Add Field" option located in that respective model(as shown
in
the Image2).
Our requirement is to add these fields using our Application front end into
the Drools Engine. We are looking for some APIs exposed by Drools to create
these facts from Portal Application.
I thank you for advising me and giving suggestions so far.
Thanks
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6:26 a.m.
Yes Manstis,That is my requirement.Can you suggest me the API and classes
used to insert that dynamic facts into the model through a small piece of
code.Really Thanks for your reply and Please suggest me in this context.
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6:34 a.m.
Package org.drools.guvnor.client.asseteditor.drools.factmodel contains the
model (class FactMetaModel represents a Fact type).
org.drools.guvnor.server.contenthandler.drools.FactModelContentHandler
handles the conversion to DRL.
These packages are as they are named in the current git master branch. They
will be different pre-5.4.0-beta1, but the class names remain the same.
On 6 December 2011 12:26, srinivasasanda <srinivasasanda(a)gmail.com> wrote:
Yes Manstis,That is my requirement.Can you suggest me the API and
classes
used to insert that dynamic facts into the model through a small piece of
code.Really Thanks for your reply and Please suggest me in this context.
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11:32 p.m.
Hi Manstis,
I couldn't find any of the packages.Unable to import them in Drools
5.0.1.I've searched github,grepcode.com but unable to find those
packages.Could you please help me with the small piece of code,how to do
dynamic field generation.Thanks for your valuable replies till now.
Thanks
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3:22 a.m.
I've spent some time trawling grepcode and to be honest cannot find any
classes that look to achieve what you need in 5.0.1.
Why use such an old version? Your like if going to be difficult, asproven
by the general lack of answers to the many questions you have been asking.
On 7 December 2011 05:32, srinivasasanda <srinivasasanda(a)gmail.com> wrote:
Hi Manstis,
I couldn't find any of the packages.Unable to import them in Drools
5.0.1.I've searched github,grepcode.com but unable to find those
packages.Could you please help me with the small piece of code,how to do
dynamic field generation.Thanks for your valuable replies till now.
Thanks
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7:13 a.m.
Thank you Manstis,
I'll update the version and get back you
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7:33 a.m.
Hi Manstis,
I've updated the version to 5.3.0.Could you please suggest me in one of the
context which I was struggling.There is a REST API to GET and POST the
packages present at server side in Drools Guvnor.In the same way,Is there
REST API to GET the facts present in the declarative model of a specified
package.If it is,can you suggest me how to achieve.
The main objective is I need to retrieve the facts present in the
declarative model of a package.
Thanks
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7:55 a.m.
Section 9.2 REST API of Guvnor's documentation gives examples.
The URL pattern /packages/{packageName}/assets will provide a list of
assets.
You'll probably have to iterate the result to find an asset of the correct
format (org.drools.guvnor.client.common.AssetFormats contains a list).
URL pattern packages/{packageName}/assets/{assetName}/source can then use
used to retrieve the DRL.
On 8 December 2011 13:33, srinivasasanda <srinivasasanda(a)gmail.com> wrote:
Hi Manstis,
I've updated the version to 5.3.0.Could you please suggest me in one of the
context which I was struggling.There is a REST API to GET and POST the
packages present at server side in Drools Guvnor.In the same way,Is there
REST API to GET the facts present in the declarative model of a specified
package.If it is,can you suggest me how to achieve.
The main objective is I need to retrieve the facts present in the
declarative model of a package.
Thanks
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