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In our template in Example 10-1, I next define two more subroutines, print_usage and print_help These subroutines complement the ones contained in the utilssh shell script They specify the output of the help and version options that I ll examine next Next in the template is a case statement that handles any command-line options specified when the plug-in is executed Our template plug-in is very simple and uses a single positional command-line option This is not an ideal model and is one of the reasons that plug-ins are often developed in more sophisticated languages such as C and Perl There are five possible case branches to follow Four of them expect specific commandline options These first four branches respond to the -V, --version, -h, and --help command-line options The -V and --version options execute the print_revision subroutine, and the -h and --help options execute the print_help subroutine.

The last branch is executed if no command-line options or any option other than the four I ve previously cited is present on the command line It is this branch that contains the test or check logic for the plug-in The test or check logic, in this case a dummy test, is shown in the following line: testdata=`test -e filename` Whatever test or check you want the plug-in to perform should be specified at this point In Example 10-1 the result of the test will be stored in the testdata variable On the next line I ve defined another variable called status, which contains the exit status for the test function I ve executed Most well-behaved Unix commands and programs should produce an exit status: 0 for successful completion and a nonzero value for unsuccessful completion, generally a value of 1.

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Figure 4-4. The new HTML file in the Source Editor For example, if you add a Table component from the Palette, you will see a dialog box like the one shown in Figure 4-5. Here, you can enter the number of rows, number of columns, border size, width, cell spacing, and cell padding. If you select the Form component, the wizard will prompt you for the form name, action, method, and encoding, as shown in Figure 4-6. You could manually type these fields into the HTML code in the Source Editor, but the wizards save time, and you do not have to remember the exact attribute names (something that is increasingly difficult the more programming/scripting languages you learn). The Palette window is discussed in more detail in 9.

Listing 6-15. Update an Object in EF //C# Example Employee x = (from emp in aw.Employee where emp.EmployeeID == 1 select emp).First(); x.MaritalStatus = "S"; aw.SaveChanges(); --SQL Generated from EF exec sp_executesql N'update [HumanResources].[Employee] set [MaritalStatus] = @0 where ([EmployeeID] = @1) ',N'@0 nvarchar(1),@1 int',@0=N'S',@1=1 After examining the simple technique in Listing 6-15 for updating an entity using EF, you may be asking yourself, How does EF know what to update In the preceding chapter, you saw that each setter method in the generated entity properties has more than just a set value statement; it also has some additional code for tracking. In Listing 6-16, you can see the MaritalStatus getter and setter of the Employee class. The set functionality is calling this.ReportPropertyChanging and this.ReportPropertyChanged. The this is referencing your entities (Employee) abstract base class System.Data.Objects. DataClasses.EntityObject, and the method calls tell the EF change tracker that the property is changing or has changed. Along with the change-tracking notifications, you also have a call to System.Data.Objects.DataClasses.StructuralObject.SetValidValue to set the value of the property. The StructuralObject class is the abstract base class of the EntityObject class and is used as a helper class for code generation. The SetValidValue internal static method is one of the many helper methods in StructuralObject and is used to check whether a value is valid and then to set that value. Listing 6-16. Change Tracking in EF get { return this._MaritalStatus; } set { this.ReportPropertyChanging("MaritalStatus"); this._MaritalStatus = global::System.Data.Objects.DataClasses. StructuralObject.SetValidValue(value, false, 1); this.ReportPropertyChanged("MaritalStatus"); } Listing 6-16 includes a simple example of updating an entity with EF, but let s take a look at an example that is more congruent with what you might see in the real world. Listing 6-17

I ll use the value of the status variable to partially determine what the overall exit status of the plug-in script will be This overall status will determine what the status of the check result that is returned to Nagios will be OK, WARNING, CRITICAL, or UNKNOWN I ll discuss this further in a moment..

s In shell script, the exit status is controlled by the exit command in the script. You can read about the Tip

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