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// User methods
public void createUser(String userLoginId, String password);
public void updateUser(String userLoginId, String password);
public void deleteUser(String userLoginId);

// User Group methods
public String createUserGroup(String description);
public void updateUserGroup(String userGroupId, String description);
public void deleteUserGroup(String userGroupId);

// User Group Assignment methods
public void assignUserToGroup(String userLoginId, String userGroupId);
public void deleteUserFromGroup(String userLoginId, String userGroupId);
public void assignGroupToGroup(String childGroupId, String parentGroupId);
public void deleteGroupFromGroup(String childGroupId, String parentGroupId);

// Permission Assignment methods
public void assignUserPermission(String userLoginId, String artifactId, Permission permission);
public void deleteUserPermission(String userLoginId, String artifactId, Permission permission);
public void assignGroupPermission(String userGroupId, String artifactId, Permission permission);
public void deleteGroupPermission(String userGroupId, String artifactId, Permission permission);

// Get the access controller for an artifact/user combination
public AccessController getAccessController (GenericValue userLogin, String artifactIdExecutionContext executionContext);

    // An artifact update method
    public void doUpdateTask(ExecutionContext context) throws AccessControlException {
        Security security = context.getSecurity();
        AccessController accessController = security.getAccessController(context.getUserLogin(), this.getArtifactId(context)executionContext);
        accessController.checkPermission(new UpdatePermission());
        ...
    }