[jboss-jira] [JBoss JIRA] (WFLY-8467) simple-election-policy is not sufficiently descriptive

[Paul Ferraro (JIRA)]

Paul Ferraro created WFLY-8467:
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             Summary: simple-election-policy is not sufficiently descriptive
                 Key: WFLY-8467
                 URL: https://issues.jboss.org/browse/WFLY-8467
             Project: WildFly
          Issue Type: Enhancement
          Components: Clustering
    Affects Versions: 11.0.0.Alpha1
            Reporter: Paul Ferraro
            Assignee: Paul Ferraro
             Fix For: 12.0.0.Alpha1


simple-election-policy was originally a port of http://anonsvn.jboss.org/repos/jbossas/trunk/cluster/src/main/java/org/jboss/ha/singleton/HASingletonElectionPolicySimple.java
It's time to revisit this.  
1. The term "simple" doesn't at all describe how the policy elects the primary node.
2. "position" isn't intuitive either - until you realize that it is a reference to the underlying data structure.
3. Is the ability to specify the nth youngest or oldest node a realistic requirement?

We can generalize this policy as doing 2 things:
  a. Sorts the candidates based on some criteria (e.g. age, name)
  b. Select the head of the sorted list
This is logically equivalent to:
members.stream().sort(comparator).findFirst();

Proposal:
<age-election-policy sort="DESCENDING|ASCENDING"/>
<name-election-policy sort="ASCENDING|DESCENDING"/>



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