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# find current debug levels with _level methods print "Class debug level: ", Debugged->class_debug_level, "\n"; print "Object debug level: ", $object->debug_level, "\n"; # find current debug levels with no-argument 'debug' print "Class debug level: ", Debugged->debug, "\n"; print "Object debug level: ", $object->debug, "\n"; # switch off class and object debug with 1-argument 'debug' Debugged->debug(0); $object->debug (0); The output from this program is A class debug message A debug message Class debug level: 2 Object debug level: 1 Class debug level: 2 Object debug level: 1 Inheriting from an object class and then using the subclass as a substitute for the parent class is a good test of inheritance. If the module is written correctly, everything the parent class does should work identically for the subclass. However, to really appreciate this, we really need to discuss inheritance properly.

ApacheTop will display the accumulated request rate since it was started for all 2xx, 3xx, 4xx, and 5xx status codes; it will also provide those same stats for the last 30 seconds, allowing you to determine if load is rising or falling. It also provides a breakdown of the top URLs being hit and the rate at which they are being hit. This information is useful for working out which pages you should focus your optimizations on first. You can change the period that ApacheTop accumulates results for in the R display by using the -T n command-line option. This allows you to change the period from the default 30 seconds to a longer period if you have a low-traffic web server. The aim is to get a representative amount of traffic displayed so you can determine the top ten URLs hit on your site and what their frequency is. Use the key once ApacheTop has finished loading to display a list of commands that can be used to modify the display, switch from URLs to referrers, zoom in, and examine detail statistics for a single URL. The most notable feature that will help with determining the distribution of top URLs in your site is the filter mechanism; for example, if you type f , a , u (for filter=>add=>url) and then type .php , ApacheTop will then restrict the URLs displayed to those ending with .php . It is suggested that you spend some time with ApacheTop to get to know the profile of your application and work out what the top pages being hit are, so you can focus your

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A private method is one that can only be called from the class in which it is defined, or alternatively, a method that can only be called from a subclass. Both concepts are implemented as specific features in many object-oriented languages. Typically, Perl does not provide any formal mechanism for defining either type of method. However, its pragmatic approach makes both easy to implement, simply by checking the class name within the method. The catch is that although easy to do, this kind of privacy is enforced at run time, rather than at compile time. Pragmatism is good, but it has its drawbacks too. To make a method private to its own class, we can check the package name of the caller and refuse to execute unless it s our own, as returned by the __PACKAGE__ token. Here is the _property method we developed for the Game::Card class from earlier in the chapter, adapted to enforce privacy rather than just implying it with a leading underscore: # _property method private to methods of this class sub _property ($$;$) { my ($self, $attr, $value) = @_; my $class = ref $self; croak "Attempt to call private method if $class ne __PACKAGE__"; if ($value) { my $oldv = $self->{$attr}; $self->{$attr} = $value; return $oldv; } return $self->{$attr}; }

To restrict access to subclasses and ourselves only, we can make use of the isa method. This returns true if a class is a subclass of the named class, so we can use it to create a subclass-private method like this. This version of _property takes this approach, which makes it much more suitable in an inheritable parent class. # _property method private to methods of this class sub _property ($$;$) { my ($self, $attr, $value) = @_; my $class = ref $self; croak "Attempt to call private method unless $class->isa(__PACKAGE__)"; if ($value) { my $oldv = $self->{$attr}; $self->{$attr} = $value; return $oldv; } return $self->{$attr}; }

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