[infinispan-issues] [JBoss JIRA] (ISPN-9715) Update internal embedded listeners to be non blocking

Update internal embedded listeners to be non blocking ----------------------------------------------------- Key: ISPN-9715 URL: https://issues.jboss.org/browse/ISPN-9715 Project: Infinispan Issue Type: Sub-task Components: Core, Listeners Reporter: Will Burns Assignee: Will Burns Priority: Major Fix For: 10.0.0.Beta4 With ISPN-9714 it will be possible to have a listener perform non blocking operations. Also any listener that doesn't return a CompletionStage is invoked in a different thread. We should convert all of our internal listeners to return a CompletionStage if they can, so that we don't have to incur the cost of switching threads to execute them. We need to ensure that all embedded listeners return a CompletionStage and never block the current thread.