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Scattering of decisions The decision for operations to be checked against permissions is scattered throughout the system, and therefore any modifications to it will cause invasive changes. Difficulty of determining access-controlled operations Consider the same problem of deciding if an operation needs to perform authorization checks from the business component developer s point of view. Since deciding whether an operation needs authorization depends on the system using the components, it is even harder to identify these operations in components than in system-specific classes. The need to write a class for each access-controlled operation For each simple operation, you must write a named or anonymous class carrying out the desired operation. Incoherent system behavior The implementation for authorizing a method is separated into two parts: the callee and the caller. The callee side uses AccessController.checkPermission() to check the permissions (as in listing 10.12), whereas the caller side uses Subject.doAsPrivileged() to execute the operation on a subject s behalf. Failure to check permissions on the callee side may allow unauthorized subjects to access your system. On the caller side, if you forget to use Subject.doAsPrivileged(), your operation will fail even if the user accessing the operation has the proper set of permissions. If you don t find and fix the problem during a code review or a testing phase, it will pop up after the deployment, potentially causing a major loss of business functionality. Difficult evolution Any change in authorization operations means making changes in every place the call is made. Any such change will require that the entire test be run through again, increasing the cost of the change.

Can you see the defect I ll give you a hint. The return value for the unlink() function in Windows has several important values that need to be checked. One of those is missing from the error handler shown in Listing 5-10. The defect resulted in the optimize() function improperly copying an intermediate file during its operation. Fortunately, this defect will have been fixed by the release of this book. MySQL AB has provided a well-designed error message mechanism that can make your error handlers more robust. To add your own error messages, you can add them to the sql/errmsg.txt file. See the internals.pdf document for more details on adding your own error messages. I cannot stress enough the importance of forming error handlers that handle all possible errors and take the appropriate actions to rectify and report the errors. Adding the DBUG macros to trace and record the error messages will ensure all of your debugging sessions are more efficient.

This list demonstrates the sheer amount of code you will need to write. However, the amount of code is not the biggest problem. Just examine the tangling of the authorization code it simply overwhelms the core logic. The conventional methods force you to stuff the system-level authorization concern into every part of the system. A utility wrapper can reduce the amount of code, but the fundamental problem of tangling remains unsolved.

Instead of clearing the cell contents, delete the entire column. Then, the column will be removed from the source data range, and you won t see the error when you try to refresh the pivot table. If you leave empty cells in the heading row, Excel sees them as invalid field names, and won t let you refresh the pivot table.

One area where Linux excels is in the quality of its advanced development tools (primarily the GNU tools). These tools include excellent debuggers capable for handling not only single-threaded but also multithreaded systems. Many debuggers are available for Linux. The most popular are gdb and ddd. The following sections present an example of each of the tools debugging the MySQL system. The scenario for these examples is to inspect what happens when the SHOW AUTHORS command is issued. I ll begin with the gdb debugger, and then show you the same scenario using ddd.