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You might think that this technique is outdated, abut as recently as mid-2003 I worked with a client that had hundreds of thousands of lines of code written in RPG that was subject to a 6-character-variable-name limitation. These issues still come up from time to time.

The first decision you have to make is whether to use RIP version 1 or RIP version 2. As if the number of choices wasn t bad enough with all the options already in front of you, now you have to choose which version of the RIP protocol to use in your environment. Let s take a look at the benefits of each version:

6-24

6

Document all abbreviations in a project-level Standard Abbreviations document Abbreviations in code create two general risks:

As an alternative, you can configure Replication Monitor to send an e-mail to an admin istrator after a specified number of replication failures. To perform this task, from the View menu select Options. In the Active Directory Replication Monitor Options dialog box, select the Notify When Replication Fails After This Number Of Attempts option, and then specify the number of failures that you want to trigger an e-mail. Finally, select the Send Mail To check box and specify an e-mail address in the associated text box.

routing updates. Classful means that subnet masks for routes are based on the original Internet address classes. It cannot understand supernetting or subnetting.

Replication Monitor provides a general means to monitor Active Directory replica tion and spot replication errors. To perform detailed analysis and troubleshooting of Active Direc tory replication, use the Repadmin command-line utility, also included in Windows Support Tools.

A reader of the code might not understand the abbreviation Other programmers might use multiple abbreviations to refer to the same word, which creates needless confusion

System Monitor is a tool located in the Performance console tree that allows you to select any of hundreds of system-related measurements for real-time monitoring. Each particular measurement, such as % Processor Time or Avg. Disk Queue Length, is known as a counter. Counters related to similar network subsystems are grouped into performance objects. When you select and add counters to System Monitor, the tool displays graphs that track real-time measurements specified by those counters, as shown in Figure 6-10.

6-25

To address both these potential problems, you can create a Standard Abbreviations document that captures all the coding abbreviations used on your project. The document can be a word processor document or a spreadsheet. On a very large project, it could be a database. The document is checked into version control and checked out anytime anyone creates a new abbreviation in the code. Entries in the document should be sorted by the full word, not the abbreviation. This might seem like a lot of overhead, but aside from a small amount of startupoverhead, it really just sets up a mechanism that helps the project use abbreviations effectively. It addresses the first of the two general risks described above by documenting all abbreviations in use. The fact that a programmer can t create a new abbreviation without the overhead of checking the Standard Abbreviations document out of version control, entering the abbreviation, and checking it back in is a good thing. It means that an abbreviation won t be created unless it is so common that it s worth the hassle of documenting it. It addresses the second risk by reducing the likelihood that a programmer will create a redundant abbreviation. A programmer who wants to abbreviate

Figure 6-10

RIP Version 2 Version 2 has many improvements over the original RIP,

The key strategy in achieving The Cardinal Rule of Software Evolution is refactoring, which Martin Fowler defines as a change made to the internal structure of the software to make it easier to understand and cheaper to modify without changing its observable behavior (Fowler 1999). The word refactoring in modern programming grew out of Larry Constantine s original use of the word factoring in structured programming, which referred to decomposing a program into its constituent parts as much as possible (Yourdon and Constantine 1979).

To access System Monitor, open the Performance console by clicking Start, selecting Administrative Tools, and then clicking Performance. (Alternatively, you can type perfmon at a command prompt or in the Run dialog box and then press Enter.) In the Performance console, select the System Monitor node in the console tree.