As of WF8 (incl. EAP7), the cluster-ha-singleton quickstart can be implemented using only public API found in public modules.
The API is here: https://github.com/wildfly/wildfly/tree/master/clustering/singleton/src/main/java/org/wildfly/clustering/singleton
This test demonstrates its usage: https://github.com/wildfly/wildfly/tree/master/testsuite/integration/clustering/src/test/java/org/jboss/as/test/clustering/cluster/singleton
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