@Override
    public PrincipalResolver getPrincipalResolver(final AuthenticationHandler handler,
                                                  final AuthenticationTransaction transaction) {
        return authenticationHandlerPrincipalResolverMap.get(handler);
    }
This is {@link DefaultAuthenticationEventExecutionPlan}.

@author Misagh Moayyed
@since 5.1.0
core/cas-server-core-authentication-api/src/main/java/org/apereo/cas/authentication/DefaultAuthenticationEventExecutionPlan.java