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my $old = $global_level; $global_level = $level; return $old; } # return current global debug level return $global_level; } # get/set class debug level sub class_debug_level { my ($self, $level) = @_; my $class = (ref $self) || $self; if (defined $level) { # set new level, return old one my $old = ${"${class}::class_debug"}; ${"${class}::class_debug"} = $level; return $old; } # return current class debug level return ${"${class}::class_debug"}; } # get/set object debug level sub debug_level { my ($self, $level) = @_; my $class = ref $self; # check to see if we were called as class method unless (my $class = ref $self) { # '$self' is a class name return $self->class_debug_level($level); } if (defined $level) { # set new level, return old one my $old = $self->{'debug_level'}; $self->{'debug_level'} = $level; return $old; } # return current object debug level return $self->{'debug_level'}; } sub debug { my ($self, $level) = (shift, shift); # if no message, set the (class or object) debug level itself return $self->debug_level($level) unless @_; # write out debug message if criteria allow # object debug is allowed if object, class, or global flag allows # class debug is allowed if class or global flag allows my $class = (ref $self) || $self;

How will your services handle errors and exceptions When you invoke a CFC directly, you can use try/catch statements to trap and handle exceptions. But with services, errors may occur on a completely different system than the consuming application. Make sure to build in error logging. Create a logging component that logs messages either to a file or a database table. Also, consider having the component fire off an e-mail message to you when errors do occur. This will help you to respond quickly when problems leave your consumers hanging. When exceptions occur, call your custom error handler component, but do not throw the exception back to the client. For SOAP services, you could return AxisFault errors. For REST services, you could rely on HTTP error codes. But keep your services generic. Establish a consistent standard for the data that your service returns. Return a success/failure message, a detailed results message, and any results data for a success. Consistency will help consumers react to the results of your service functions, and so will including as much description as possible with your failure messages. Do not return error codes unless you document them well and your consuming applications can use them. Listing 22-6 contains an example of this error handling code.

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print STDERR @_, "\n" if $level <= $global_level || ( defined ${"${class}::class_debug"} and $level <= ${"${class}::class_debug"} ) || ( ref($self) and $level <= $self->{'debug_level'} ); } 1; This class attempts to handle almost any kind of debugging we might want to perform We can set debugging globally, at the class level, or on individual objects If we do not have an object already, we can use the constructor; otherwise, we can just initialize debugging support with initialize, which operates as either a class or object method and sets the class-wide or object-specific flag appropriately In fact, it just calls debug_level, which does exactly the same thing, but initialize sounds better in a constructor.

ApacheTop can be installed via apt-get on Debian systems, and is available in .rpm form for Red Hat/CentOS/Fedora systems. You can install ApacheTop on a Debian-based (Ubuntu) system with the following command:

The three accessor/mutator methods all work the same way and perform the same logic, applied to their particular debugging flag global, class, or object with the exception of the object-level accessor/mutator, which passes class-level requests to the class method if it is called with a package name rather than an object The debug routine itself now checks all three flags to see if it should print a debug message If any one of the three is higher than the level of the message, it is printed; otherwise, it is ignored Class-level debugging messages ignore the object-level debug flag, since in their case there is no object to consult As a convenience, if we supply no message at all, we can set and get the debug level instead.

Since we simply pass the request to debug_level, and debug_level in turn passes class method calls to class_debug_level, we can in fact handle all of the module s functionality except the global flag through debug To demonstrate all this in action, here is a short script, complete with its own embedded test object class (which does nothing but inherit from Debuggable) that tests out the features of the module: #!/usr/bin/perl # debuggedpl use warnings; use strict; # a test object class { package Debugged; use Debuggable; our @ISA = qw(Debuggable); sub new {return bless {}, shift;} } # create a test object from the test class my $object = new Debugged; # defined below so no 'use' # set debug levels globally, at class level, and on the object Debugged->global_debug_level(0); Debugged->class_debug_level(2); $object->debug_level(1); # print class and object-level debug messages Debugged->debug(1, "A class debug message"); $object->debug(1, "A debug message");.

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