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final UserAccount currentUser = PrincipalHelper.getUser(); throw new TimesheetSecurityException( "Access violation while attempting to list resources", currentUser); } @AfterReturning(pointcut="findTimesheetOperation()",returning = "timesheet") public void findTimesheet(final Timesheet timesheet) { validateCurrentUser(); final UserAccount account = timesheet.getConsultant(); if (usersMatch(account) || isAdministrator()) { return; } final UserAccount currentUser = PrincipalHelper.getUser(); throw new TimesheetSecurityException( "Access violation while attempting to list resources", currentUser); } private boolean usersMatch(final UserAccount target) throws TimesheetSecurityException { final UserAccount currentUser = PrincipalHelper.getUser(); return target.getId().equals(currentUser.getId()); } private void validateCurrentUser() throws TimesheetSecurityException { final UserAccount currentUser = PrincipalHelper.getUser(); if (currentUser == null) { throw new TimesheetSecurityException("No user logged in", null); } } private boolean isAdministrator() { final UserAccount currentUser = PrincipalHelper.getUser(); for (final UserRole role : currentUser.getRoles()) { if (UserRole.ROLE_ADMINISTRATOR.equals(role.getRoleName())) { return true; } } return false; } }

Once you have set quotas for one user, you may want to apply them to other users. Instead of following the same procedure for all users on your system, you can use the edquota -p command. For example, edquota -p florence alex copies the quotas currently applied for user florence to user alex.

Another very interesting feature of CTEs is the ability to call one CTE from another CTE definition. This is not recursion, which you will learn about in the Writing a Recursive Query section. Calling one CTE from within another CTE definition allows you to base one query on a previous query. Here is a syntax example: WITH <cteName1> AS (SELECT <col1>, <col2> FROM <table1>), <cteName2> AS (SELECT <col1>, <col2>, <col3> FROM <table3> INNER JOIN <cteName1> ON <join condition>) SELECT <col1>, <col2>, <col3> FROM <cteName2> The order in which the CTE definitions appear is very important. You cannot call a CTE before it is defined. Type in and execute the code in Listing 10-3 to learn more. Listing 10-3. Joining a CTE to Another CTE USE tempdb; GO --1 IF OBJECT_ID('dbo.JobHistory') IS NOT NULL BEGIN DROP TABLE dbo.JobHistory; END; --2 CREATE TABLE JobHistory( EmployeeID INT NOT NULL, EffDate DATE NOT NULL, EffSeq INT NOT NULL, EmploymentStatus CHAR(1) NOT NULL, JobTitle VARCHAR(50) NOT NULL, Salary MONEY NOT NULL, ActionDesc VARCHAR(20) CONSTRAINT PK_JobHistory PRIMARY KEY CLUSTERED ( EmployeeID, EffDate, EffSeq )); GO

Caution To set quotas, the user you are setting quotas for must be known to the quota system. This is not done automatically. To make sure that new users are known to the quota system, you must initialize the quota system again after creating the new users. I recommend setting up a cron job (see the Setting the System to Your Hand section in 6 to do this automatically at a reasonable interval).

The first method, accountParameterOperation, defines a pointcut that will apply to any method in any class that takes at least one parameter The type of parameter is defined by the parameter list of the annotated method as being a UserAccount reference The name of the parameter in the pointcut annotation must correspond to the name of the parameter in the method definition, and can be made available to advice logic by using this same name The second method, timesheetReturningOperation, defines a pointcut that will apply to any method in any class that returns a Timesheet reference The third method, accountServiceOperation, defines a pointcut that will apply to any method that implements the TimesheetService interface In order to apply our two advice methods, we need to combine these pointcuts to form more-restrictive pointcuts.

When all the quotas have been set the way you want, you can use the repquota command to monitor the current quota settings for your users. For example, the repquota -aug command shows current quota settings for all users and groups on all volumes. Now that you ve set all the quotas you want to work with, you just have to start the quota service, and you ll do this with the /etc/init.d/quota start command.