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// Set the a global subject property this.subject = "Global subject"; // Outputs "Global subject" now that the property has been set showSubject(); // Define the EmailMessage class var EmailMessage = function(subject) { this.subject = subject; } // Copy and assign the showSubject function to the EmailMessage class, // making the EmailMessage class the owner of the function. // Note the lack of braces after the function, which copies the code of the // function rather than executing it straightaway EmailMessage.prototype.showSubject = showSubject; // Create a new instance of the class var myEmailMessage = new EmailMessage("I am the subject."); // Outputs "I am the subject.", since the owner of the function is the class myEmailMessage.showSubject(); // Outputs "Global subject" just to demonstrate that this has not been lost showSubject(); // Now let's add another method to the class, calling showSubject differently EmailMessage.prototype.outputSubject = function() { showSubject(); } // Outputs "Global subject" since this method calls the function // that is associated with the window object myEmailMessage.outputSubject(); If you wish to call a function or method and ensure that the this keyword refers to a different object than the one it would normally refer to, two functions allow you to do this: apply and call. The difference between the two in implementation terms is very minor. apply expects any arguments you are passing to the function to be supplied as an array, whereas call does not. Listing 2-6 shows these two functions in action, altering the value of the this keyword in a set of reusable functions. Listing 2-6. Using apply and call to Alter the Value of the this Keyword var showSubject = function() { alert(this.subject); }

The following attribute values are valid for GPU program targets (HLSL), syntaxes (assembler), and profiles (Cg).

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The first view we are going to look at is called Tactical Monitoring Overview, shown in Figure 4-2. It is the first item in the Monitoring menu and could be considered an ideal view for a projected status window in an NOC. It displays six major features of your monitoring environment: the status of your monitoring performance, network outages, network health, hosts, services, and the status of your monitoring features, such as whether flap detection, notifications, or checks are enabled. Clicking the Tactical Monitoring Overview link launches the tac.cgi CGI program. First, at the top left of the Tactical Monitoring Overview page (and most of the Monitoring pages) a box is displayed showing the current date and time, a link to the Nagios website, and a line indicating the name of the user who is currently logged into the web console. You can see an example of this box in Figure 4-3. Located at the top-right corner of the page, the Monitoring Performance box contains the statistics on the execution time and latency of your host and service checks. It also displays the total number of active and passive host and service checks.

var setSubjectAndFrom = function(subject, from) { this.subject = subject; this.from = from; } // Executed against the global window object showSubject(); // Outputs "undefined" setSubjectAndFrom("Global subject", "me@denodell.com"); showSubject(); // Outputs "Global subject" // Create EmailMessage class var EmailMessage = function() { this.subject = ""; this.from = ""; }; // Instantiate class var myEmailMessage = new EmailMessage(); // Execute setSubjectAndFrom function, forcing the this keyword within the function // to refer to myEmailMessage instead of the window object. Parameters are // passed in series after the object to apply as the owner, setting the subject to // "New subject" and the from property to "den@denodell.com" setSubjectAndFrom.call(myEmailMessage, "New subject", "den@denodell.com"); // As a demonstration, we will do the same thing now using apply instead of call; // apply expects an array of arguments, unlike call. // You can use either apply or call in your code setSubjectAndFrom.apply(myEmailMessage, [ "New subject", "den@denodell.com" ]); // Outputs "New subject" showSubject.call(myEmailMessage);

The Network Health and Network Outage boxes are both visual representations of the health of your network and your hosts and services. The Network Outage box indicates whether it appears any network outages have occurred in your environment; clicking on this box takes you to outages.cgi, which we will discuss briefly later in this chapter. The Network Health box is a visual representation in the form of two bars one for hosts and one for services that indicates the health of your hosts and services. As you can see in Figure 4-2, the Host Health column is full but the Service Health column is only partially full, indicating that one or more services has a problem. The boxes below this indicate the overall status of your hosts and services. As you will remember from 2, hosts can have four states: DOWN, UNREACHABLE, UP, and UNKNOWN. On the Hosts box in the Tactical Monitoring Overview page, the totals of the hosts in DOWN,

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