DMN Evaluation (A8Studio)

To enable external evaluation of DMN in DMN Hub, you require an API key and a DMN Hub URL. They are configured via A8config in A8Studio web.

• To Generate the API Key, (follow these steps).
• For the DMN Hub URL, check here.

Configurating the Evaluation Variables

To configure the variables (API key and DMN Hub URL), head to the Configuration section of your A8Studio App.

• Apps > Configuration
• Click the Add Variable button.

Setting Up - API Key & URL Variables

Mandatory

Ensure the "Key" for the API Key & URL variables are exactly as specified: dmn_hub_apiKey & dmn_hub_url.

Configuring the API Key Variable

• Enter (dmn_hub_apiKey) as your Key for the API Key variable.
• Enter the generated API Key as your Value.
• Click Create.

Configuring the DMN Hub URL Variable

• Enter (dmn_hub_url) as your Key for the URL variable.
• Enter this [DMN server url]/api/v1/dmn/evaluate as your Value.
• Click Create.

Methods for External Evaluation

There are two methods to evaluate the DMN outside of DMN Hub:

1. evaluateDMN

Using A8Flow SDK's evaluateDMN:

• Configure the data by creating a payload.
• Specify the DMN name.
• Add the version code.

Payload

const payload = {
    data: {},
    dmnName: "personalLoan",
    "version": 2
  }

Note: If the version code is not provided, it defaults to the latest one.

• Set the DMN Hub flag to true

DMN_Hub_Flag

const response = await a8flow.evaluateDMN("", payload, true)

2. Business Rule Task

Via Business Rule Task in Assisted flow:

• Place a Business Rule Task.
• Select DMN Hub in the Implementation field within the properties section.

• Set the DMN name in the Decision Ref field.
• Assign a Varaible name to the output in Result Variable.

The captured Result can then be used as required.

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