UserService { public Role getRole(ByteBuffer username) { lock.readLock().lock(); try { if(ByteBuffers.encodeAsHex(username).equals(SERVICE_USERNAME_HEX)) { return Role.SERVICE; } else { User user = getUserStrict(username); return user.role(); } } finally { lock.readLock().unlock(); } } @SuppressWarnings("unchecked") private  UserService(String backingStore, int accessTokenTtl,
            TimeUnit accessTokenTtlUnit); static UserService create(String backingStore); boolean authenticate(ByteBuffer username, ByteBuffer password); boolean can(ByteBuffer username, Permission permission,
            String environment); void create(ByteBuffer username, ByteBuffer password, Role role); void delete(ByteBuffer username); void disable(ByteBuffer username); void enable(ByteBuffer username); boolean exists(ByteBuffer username); void forEachUser(Consumer<ByteBuffer> consumer); Role getRole(ByteBuffer username); void grant(ByteBuffer username, Permission permission,
            String environment); boolean isEnabled(ByteBuffer username); void revoke(ByteBuffer username, String environment); void setPassword(ByteBuffer username, ByteBuffer password); void setRole(ByteBuffer username, Role role); final AccessTokenManager tokens; }
@Test public void testRoleOfServiceUserTokenIsAlwaysServiceRole() { AccessToken token = service.tokens.serviceIssue(); ByteBuffer username = service.tokens.identify(token); Assert.assertEquals(Role.SERVICE, service.getRole(username)); }