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1 He has indicated that this package would preferably be written in Perl or PHP Galstad has cited a number of reasons for this change: He feels the current user interface is a poor design The CGIs need to be recompiled any time the HTML front-end is changed This change makes it easier to support internationalization (or multiple languages) It would be problematic to introduce session state tracking in the current CGIs This process would be considerably easier using a PHP/Perl-developed interface It is Galstad s intention that a third party will develop this interface rather than him, but he has offered to assist in the process Indeed, a couple of front-ends written in PHP have recently started development and at the time of this writing are in Alpha2 Unfortunately, at this time these interfaces are both under heavy development and as yet only officially support Nagios version 1.

You have seen that, when creating a new child class that inherits from a parent class, the child has available all the properties and methods from the parent. Now suppose that you want your child class to contain a method with the same name as that of the parent, and to execute the code within that method in your child, instead of using the method from the parent. This is known as polymorphism. Listing 2-3 demonstrates polymorphism, where the child class contains a method with the same name as the parent class from which it was inherited.

x In light of this, I am not going to cover the web console in huge detail This isn t a big issue as generally speaking the web console is intuitive and easy to navigate I ll cover the highlights.

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Current frame time scaled by the <optional> (1.0 otherwise). Current frames per second. Current viewport width in pixels. Current viewport height in pixels.

Listing 2-3. Polymorphism in Action: Replacing the Method of a Parent Class var EmailMessage = function(subject) { this.subject = subject; this.send = function() { alert("Email message sent!"); } } // Inherit EventInvitation class from EmailMessage var EventInvitation = function() {}; EventInvitation.prototype = new EmailMessage("You are cordially invited to..."); EventInvitation.prototype.constructor = EventInvitation; // Override the inherited send method EventInvitation.prototype.send = function() { alert("Event invitation sent!"); } var myEmailMessage = new EmailMessage("A new email coming your way."); var myEventInvitation = new EventInvitation(); myEmailMessage.send(); // Outputs "Email message sent!" myEventInvitation.send(); // Outputs "Event invitation sent!" Now suppose that you want to override a method in a child class so that it executes extra code in addition to that of the method in the parent class. So, instead of replacing a parent s method, you wish to extend it in some way, while still using the same method name provided by the parent. Listing 2-4 demonstrates this principle.

1. See www.nagios.org/development/upcoming.php. 2. See http://sourceforge.net/projects/nagios-php/ and www.itgroundwork.com/. 113

of the web console and its major features with an emphasis on how to use the web console to interact and control the Nagios server using external commands. This should provide a suitable introduction to the web console that will allow you to explore it further from there. As I ve discussed in previous chapters, the web console is made up of an HTML front-end that is combined with a series of CGI programs.

Caution Any methods or properties you wish to extend as demonstrated in Listing 2-4 must be declared in the parent class using the prototype keyword; otherwise, they cannot be located from within the child class.

4-vector of (viewport_width, viewport_height, inverse_viewport_width, inverse_viewport_height). Object-space view direction vector. Object-space X axis view vector. Object-space Y axis view vector. Vertical field of view in radians. Near clip limit (world units). Far clip limit (in world units), or 0 for infinite far clip. Applies only to shadow receiver alternate vertex programs; provides the current shadow projector view/projection matrix. Active zero-based pass number. Useful for multipass techniques that need to know the pass number. Similar to pass_number except that this is the iteration number on a particular pass (single-iteration passes will always have pass_iteration_number of zero).

The HTML front-end of the Nagios web console is divided into two sections. The first section is the menu pane that runs on the left-hand side of the page, and the second section is the main display pane, which occupies most of the page to the right of the menu pane. You can see this in Figure 4-1.

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