Application Delivery Management

Nested repeats

December 31, 2023

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With the nested repeat construct you can have more than one repeat construct in each component depending on the definition of the component. Consider a nested repeat of two levels. For each element in the outer list (first repeat-list), you can create a repeat list for all elements of the inner list (second repeat-list). The StyleBook compiler supports up to three nested repeats. Each repeat level has repeat-item and repeat-index attributes associated with it. Both repeat-item and repeat-index attributes are optional. In addition, each repeat can also specify a repeat-condition.

Example:


parameters:
  -
      name: vips
      type: ipaddress[]
  -
      name: vip-ports
      type: tcp-port[]
components:
  -
      name: lbvservers-comp  
      type: ns::lbvserver
      repeat:
         repeat-list: $parameters.vips
         repeat-item: ip
         repeat:
              repeat-list: $parameters.vip-ports
              repeat-item: port
      properties:
         name: str("lb-") + str($ip) + '-' + str($port)
         servicetype: HTTP
         ipv46: $ip
         port: $port
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In the above example, for each item in $parameters.vips, we iterate over all items of $parameters.vip-ports. Thus, for each ipaddress specified in $parameters.vips, we create lbvserver configuration objects for all ports specified in $parameters.vip-ports. The properties section define the name of the object with “lb” as a prefix for the combination of the IP address and the port. Therefore, for each iteration, $ip + $port defines a unique combination of the IP address and the port number.

If repeat-item attribute is not provided, the compiler generates a default value for it. The default values for repeat-item are: $repeat-item, $repeat-item-1, $repeat-item-2 respectively for each repeat level. Similarly, if repeat-index attribute is not provided, the compiler generates a default value for it. The default values for repeat-index are: $repeat-index, $repeat-index-1, and $repeat-index-2 respectively for each repeat level.

The following example describes the naming convention in the absence of repeat-item and repeat-index attributes in a nested repeat object.

Example:


components:
-
     name: lbvservers-comp  
     type: ns::lbvserver
     repeat:
         repeat-list: $parameters.vips
         repeat:
            repeat-list: $parameters.vip-ports
     properties:
        name: str("lb-") + str($repeat-item) + '-' + str($repeat-item-1)
        servicetype: HTTP
        ipv46: $repeat-item
        port: $repeat-item-1
<!--NeedCopy-->

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Nested repeats

December 31, 2023

Contributed by:

December 31, 2023

Contributed by:

Nested repeats

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