CodeReady Containers - Exploring a Node.js Front End with Decision Management Back End

There are two options to install and run this project on the OpenShift Container Platform (OCP) or using your own existing installation or to install on CodeReady Containers which provides you with a local OCP cluster.

• your own CodeReady Containers installation, if using this you just need to set the variables to point to it in init.{sh|bat} script.

• CodeReady Containers Easy Install

2. Download and unzip this demo.

3. Run 'init.sh' or 'init.bat' file. 'init.bat' must be run with Administrative privileges:

# If using the CodeReady Containers installation, just ensure a correctly set cluster 
# address for the HOST_IP variable at the top of the init.{sh|bat} files, for example: 
# 
# HOST_IP=api.crc.testing 
# 
# Now just run the script without arguments and it picks up that hostname as follows: 
# 
$ ./init.sh 

Now log in to Red Hat Decision Manager to start developing containerized process automation projects (the address will be generated by OCP):

• CodeReady Container example: https://crc-quick-loan-bank-demo-appdev-in-cloud.apps-crc.testing ( u:erics / p:redhatdm1! )

Testing API access

Prior to running the Node.js front-end application, let's explore the API and confirm that it's working:

1. Log in to the decision manager business central dashboard at: http://insecure-quick-loan-bank-rhdmcentr-appdev-in-cloud.apps-crc.testing with u:erics and p:redhatdm1!

2. Click on the "loan-application" project to open the Loan Application Demo project.

3. The project has simple data model (Loan & Applicant) and single decision table (loan-application) which contains the loan approval rule set.

4. Build and deploy version 1.0 of the project. Click on the "Build and Deploy" in the upper right corner.

5. Go to "Menu -> Deploy -> Execution Servers" repository to see the 'loan-application_1.0' KIE Container deployed on the Decision Server.

6. The decision server provides a Swagger UI that documents the full RESTful interface exposed by the server at: http://insecure-quick-loan-bank-kieserver-appdev-in-cloud.apps-crc.testing/docs

7. In the Swagger UI:

   • navigate to "KIE Server and KIE containers"
   • expand the "GET" operation for resource "/server/containers"
   • click on "Try it out"
   • leave the parameters blank and click on "Execute"
   • when asked for credentials use: Username: erics, Password: redhatdm!
   • observe the response, which lists the KIE Containers deployed on the server and their status (STARTED, STOPPED).

8. We can use the Swagger UI to test our Loan Approval Decision Service. In the Swagger UI:

   • navigate to "KIE session assets"
   • expand the "POST" operation for resource "/server/containers/instances/{id}"
   • click on "Try it out"
   • set the "id" parameter to the name of the KIE Container that hosts our rules, in this case loan-application_1.0.
   • set "Parameter content type" to application/json.
   • set "Response content type" to application/json
   • use the following request as the "body" parameter. Note that the Loan object has its approved attribute set to false:

9. { 
     "lookup": "default-stateless-ksession", 
     "commands": [ 
       { 
         "insert": { 
           "object": { 
             "com.redhat.demo.qlb.loan_application.model.Applicant": { 
               "creditScore":410, 
               "name":"Billy Bob", 
               "age":40, 
               "yearlyIncome":90000 
             } 
           }, 
           "out-identifier":"applicant" 
         }
       }, 
       { 
         "insert": { 
           "object": { 
             "com.redhat.demo.qlb.loan_application.model.Loan": { 
               "amount":250000, 
               "duration":10 
             } 
           }, 
           "out-identifier":"loan" 
         } 
       }, 
       { 
         "start-process" : { 
           "processId" : "loan-application.loan-application-decision-flow", 
           "parameter" : [ ], 
           "out-identifier" : null 
          } 
       } 
     ] 
   } 
   
   

• Observe the result. The Quick Loan Bank rules have fired and determined that, based on the credit score of the application, and the amount of the loan, the loan can be approved. The approved attribute of the Loan has been set totrue.

Exploring the front end UI

1. Log in to the decision manager business central dashboard at: http://insecure-quick-loan-bank-rhdmcentr-appdev-in-cloud.apps-crc.testing with u:erics and p:redhatdm1!

2. Click on the "loan-application" project to open the Loan Application Demo project.

3. The project has simple data model (Loan & Applicant) and single decision table (loan-application) which contains the loan approval rule set.

4. Build and deploy version 1.0 of the project. Click on the "Build and Deploy" in the upper right corner.

5. Go to "Menu -> Deploy -> Execution Servers" repository to see the 'loan-application_1.0' KIE Container deployed on the Decision Server.

6. Open the deployed Quick Loan Bank application form: http://qlb-client-application-appdev-in-cloud.apps-crc.testing

7. Fill in the form as follows and submit for evaluation:

       
   
        Name: Eric D. Schabell 
       
   Age: 40 
   
   Credit Score: 410 
   
   Yearly Income: 90000 
   
   Amount: 250000 
   
   Duration: 10 

Try to enter different values to see a loan get disapproved, for example, change above applicant age from 40 to 80 for rejection based on age.

This concludes the tour of our Quick Loan Bank example with a Node.js front end and decision management back end. Looking for more content to get started with Red Hat Decision Manager? 

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