code: protected void addUserToRole(String user, String role) {
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled()) {
              SibTr.entry(tc, CLASS_NAME + "addUserToRole", new Object[] { user, role });
          }
          Set<String> usersForTheRole = roleToUserMap.get(role);
          if (usersForTheRole != null) {
              usersForTheRole.add(user);
          } else {
              usersForTheRole = new HashSet<String>();
              usersForTheRole.add(user);
          }
          roleToUserMap.put(role, usersForTheRole);
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled()) {
              SibTr.exit(tc, CLASS_NAME + "addUserToRole");
          }
      }
docs: Add a User to the particular role
  
  @param user
  @param role