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From Mike Zaccardo <mike.zacca...@cloudsoftcorp.com>
Subject Nice-to-have: Built-in Cluster Sensor List Generator
Date Fri, 06 May 2016 00:44:55 GMT
Hi all,

I've encountered the following task numerous times when authoring
`DynamicCluster` blueprints: write a sensor that returns a comma separated
list of values for each member of a cluster (e.g. the host address of each
member).

This is currently how to achieve such a task:

      brooklyn.enrichers:
      - type: org.apache.brooklyn.enricher.stock.Aggregator
        brooklyn.config:
          uniqueTag: member-address-aggregator
          enricher.aggregator.excludeBlank: true
          enricher.aggregating.fromMembers: true
          enricher.sourceSensor: $brooklyn:sensor("member.host.address")
          enricher.targetSensor:
$brooklyn:sensor("member.host.address.list")

      - type: org.apache.brooklyn.enricher.stock.Joiner
        brooklyn.config:
          uniqueTag: member-address-joiner
          enricher.sourceSensor:
$brooklyn:sensor("member.host.address.list")
          enricher.targetSensor:
$brooklyn:sensor("member.host.address.list.comma_separated")
          minimum: $brooklyn:config("cluster.size")
          separator: ","
          quote: false

And here[1] is a specific example in a real blueprint.

That's pretty verbose for a commonly required task.  Instead, it would be
nice to have something resembling the following:

      brooklyn.enrichers:
      - type: org.apache.brooklyn.enricher.stock.ClusterListGenerator
        brooklyn.config:
          uniqueTag: member-address-list-generator
          enricher.sourceSensor: $brooklyn:sensor("member.host.address")
          enricher.targetSensor:
$brooklyn:sensor("member.host.address.list")

Short and sweet!  WDYT?

-Mike

[1]
https://github.com/cloudsoft/brooklyn-tendermint/blob/master/tendermint-mintnet.bom#L82

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