Creating a Business Rule Template

To create a business template using the Business Template editor, follow the procedure below:

1. Go to <SP_HOME> from the terminal and Access the Stream Processor Studio via the http://<HOST_NAME>:<EDITOR_PORT>/editor URL. 
   
   • On Windows:  editor.bat --run

   • On Linux/Mac OS:  ./editor.sh

2. Access the Business Rules Template Editor via the http://<HOST_NAME>:<PORT>/template-editor URL. 

   The default URL is http://localhost:9390/template-editor

3. The Template Editor opens as shown below. There are two views from which you can interact and create a template group. Design view allows you to visualize a template group and interact with it. Code view allows you to interact with a template group by typing content. (For more information about template group structure, see Business Rules Templates.)
   

   Do not template sensitive information such as passwords in a Siddhi application or expose them directly in a Siddhi application. For detailed instructions to protect sensitive data by obfuscating them, see Protecting Sensitive Data via the Secure Vault.

   
   
   The following sections explain the two methods of creating a template group.  to create a template group.
   

Create from Design View

To create a business rules template group from the design view, follow the procedure below:

1. Enter a UUID (Universally Unique Identifier), name and a description for the template group as follows.

   Field	Name
   UUID	sweet-factory
   Name	Sweet Factory
   Description	Analyzes Sweet Factory scenarios

   
   
   
   

2. Expand the first rule template that exists by default, and enter the following details. (Note that, you need to configure the deployment nodes as explained in Prerequisites for Business Rules)

   Field Name	Value
   UUID	identifying-continuous-production-decrease
   Name	Identify Continuous Production Decrease
   Description	Alert factory managers if the rate of production continuously decreases for a specified time period
   Type	Template
   Instance Count	One

   
   
   
   

3. To include a Siddhi application template, expand the first template that is displayed by default, and enter the following Siddhi application template.

   

   @App:name('SweetFactory-TrendAnalysis')
   
   @source(type='http', @map(type='json'))
   define stream SweetProductionStream (name string, amount double, factoryId int);
   
   @sink(type='log', @map(type='text', @payload("""
   Hi ${username},
   Production at Factory {{factoryId}} has gone
   from {{initalamout}} to {{finalAmount}} in ${timeInterval} seconds!""")))
   define stream ContinousProdReductionStream (factoryId int, initaltime long, finalTime long, initalamout double, finalAmount double);
   
   from SweetProductionStream#window.timeBatch(${timeInterval} sec)
   select factoryId, sum(amount) as amount, currentTimeMillis() as ts
   insert into ProdRateStream;
   
   partition with ( factoryId of ProdRateStream )
   begin
     from every e1=ProdRateStream,
     e2=ProdRateStream[ts - e1.ts <= ${timeRange} and e1.amount > amount ]*,
     e3=ProdRateStream[ts - e1.ts >= ${timeRange} and e1.amount > amount ]
     select e1.factoryId, e1.ts as initaltime, e3.ts as finalTime, e1.amount as initalamout, e3.amount as finalAmount
     insert into ContinousProdReductionStream;
   end;

4. To add variable attributes to the script, click Add Variables. 

   A script is a javascript that can be applied when the inputs provided by the business user who uses the template need to be processed before replacing the values for the template variables. e.g., If the average value is not provided, a function within the script can derive it by calculating it from the minimum value and the maximum value provided by the business user.

   
   
   
   

5. To specify the attributes that need to be considered as variables, select the relevant check boxes under Select templated elements. In this example, you can select the username and timeRange check boxes to to select the attributes with those names as the variables
   
   Then click Add Script to update the script with the selected variuables with auto-generated function bodies as shown below.
   
   
   

6. Edit the script to add the required functions. In this example, let's rename myFunction1(input) to getUsername(email), and myFunction2(input) to validateTimeRange(number).
   

   var username = getUsername('${userInputForusername}');
   var timeRange = validateTimeRange('${userInputFortimeRange}');
   /**
   * Extracts the username from given email
   * @returns Extracted username
   * @param email Provided email
   */
   function getUsername(email) {
   	if (email.match(/\S+@\S+/g)) {
   		if (email.match(/\S+@\S+/g)[0] === email) {
   			return email.split('@')[0];
   		}
   		throw 'Invalid email address provided';
   	}
   	throw 'Invalid email address provided';
   }
   
   
   /**
   * Validates the given value for time range
   * @returns Processed input
   * @param input User given value
   */
   function validateTimeRange(number) {
   	if (!isNaN(number) && (number > 0)) {
   		return number;
   	} else {
   		throw 'A positive number expected for time range';
   	}
   }

7. To generate properties, click Generate against Properties. 
   
   This expands the Properties section as follows.
    

8. Enter values for the available properties as follows. For this example, let's enter values as shown in the following table.

   A property is defined for each templated attribute (defined in the ${templatedElement} format) so that it is self descriptive for the business user who uses the template. The values configured for each property is as follows:

   • Field Name: The name with which the templated attribute is displayed to the business user.

   • Field Description: A description of the property for the business user to understand its purpose.

   • Default Value: The value assigned to the property by default. The business user can change this value if required.

   • Options: this is an optional configuration that allows you to define a set of values for a property so that the business user can select the required value from a list. This is useful when the the possible value for the property is a limited set options.

   Property	Field Name	Field Description	Default Value
   timeInterval	Time interval (in seconds)	Production amounts are considered per time interval	6
   userInputForusername	Manager Email ID	Email address to show in greeting	example@email.com
   userInputFortimeRange	Time Range (in milliseconds)	Time period in which, product amounts are analyzed for decrease	5

   
   

   
   

9. To save the template, click the save icon at the top of the page.
   

Create from code view

When you use the code view, the same parameters for which you enter values in the design view are represented as JSON keys. For each parameter, you can specify a value against the relevant JSON key as shown in the extract below.

When you update the code view with a valid template group definition, the design view is updated simultaneously as shown below.

However, if the content you enter in the code view is an invalid template group, the design view is not updated, and an error is displayed as follows.

When an error is detected in the entered template group structure, the Recover button is displayed with the error message.

When you click Recover, the code view is receted to the latest detected valid template group definition. At any given time, the design view displays information based on the latest detected valid template group definition.