[jboss-jira] [JBoss JIRA] (WFLY-13001) Add user API to handle merging HttpSession attributes/metadata on partition merge

[Paul Ferraro (Jira)]

Paul Ferraro created WFLY-13001:
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             Summary: Add user API to handle merging HttpSession attributes/metadata on partition merge
                 Key: WFLY-13001
                 URL: https://issues.redhat.com/browse/WFLY-13001
             Project: WildFly
          Issue Type: Feature Request
          Components: Clustering
    Affects Versions: 18.0.1.Final
            Reporter: Paul Ferraro
            Assignee: Paul Ferraro


In the event of a detected network partition, the distributed web session manager's Infinispan cache behaves in one of 3 ways:

# Disallow both reads and writes from/to a web session in all partitions
# Allow reads from a web session in all partitions, but only allow writes to a web session if the partition contains all data owners.
# Allow both reads and writes to/from a web session in all partitions

For customers who opt for #3 (i.e. maximum availability), in the event that a web session is updated in both partitions, they need be able to provide a mechanism to resolve conflicts when the partitions eventually merge.
When partition handling of a web session cache is enabled, users need a mechanism to control how to resolve conflicting session attributes on merge.

Something like:

{code:java}
public interface SessionAttributeMergePolicy {
    Object merge(String attributeName, Object primaryPartitionAttributeValue, Iterable<Object> minorityPartitionAttributeValues); 
}
{code}



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