public void assertJoined(final UUID serviceId){
  m_triggers.add(new QuorumEventInvariant(QuorumEventEnum.SERVICE_LEAVE,serviceId));
  assertMembership(m_quorum.getJoined(),serviceId);
}

public void assertJoined ( final UUID serviceId ) { m_triggers . add ( new QuorumEventInvariant ( QuorumEventEnum . SERVICE_LEAVE , serviceId ) ) ; assertMembership ( m_quorum . getJoined ( ) , serviceId ) ; }
establish an invariant that the specified service is joined with the met quorum .
