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A term you may have heard, often in disparaging tones, is anemic domain model. This is considered an anti-pattern, which is something you should try to avoid in your design. In order to avoid it, you need to know what it is. Many consider it good practice in object-oriented design to create richly functional business objects that contain data and all of the associated logic for that data. This is your domain model. An anemic domain model s Business Objects really only contain data (and getters and setters), and the business logic is instead in other objects, typically Service or Manager Objects. A symptom of this is code that calls getters on an object to retrieve data, performs some operation on that data, and then calls setters on the same object to update the data. It s likely that the operation should be part of the object that already contains the data, and the code should just ask the object to perform that operation directly on its own data. If your code exhibits these symptoms I just described, your beans are probably just acting as data containers and all your business logic is in your Service or Manager Objects. In other words, your domain model is anemic. You need to feed your beans some more logic and turn them into proper business domain objects.

An object method does work for a particular object, and receives an object as its first argument. Traditionally we give this object a name like $self or $this within the method, to indicate that this is the object for which the method was called. Like many aspects of object-oriented programming in Perl (and Perl programming in general), it is just a convention, but a good one to follow. Other languages are stricter; a variable called self or sometimes this is automatically provided and so we don t have a choice about the name. Here is a pair of object methods that provide a simple object-oriented way to get and set properties (also known as attributes, but either way they are values) on an object. In this case the object is implemented as a hash, so within the class this translates into setting and getting values from the hash: # get a property - read only sub get { my ($self, $property) = @_; return $self->{$property}; # undef if no such property! } # set a property - return the old value sub set { my ($self, $property, $value) = @_; $oldvalue = $self->property if exists $self->{$property}; $self->{$property} = $value; return $oldvalue; # may be undef; }

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In practice, the users of our objects could simply dereference them and get to the hash values directly. However, we do not want to encourage this since it bypasses our interface. So instead we provide some methods to do it for them. These methods are still very crude though, since they do not check whether a property is actually valid or not. We will look at some better ways of handling properties later. As a more practical example, here is a pair of search methods that belong to the Document object class we created a constructor for earlier, along with the constructor and the rest of the package, to make it a complete example. Note that the wordsearch method itself makes an objectoriented call to the search method to carry out the actual work: # Document.pm package Document; use strict; # scalar constructor sub new { my $class = shift; my $self; if (my $fh = shift) { local $/ = undef; $$self = <$fh>; } return bless $self, $class; } # search a document object sub search { my ($self, $pattern) = @_; my @matches = $$self =~ /$pattern/sg; return @matches; } # search and return words sub wordsearch { my ($self, $wordbit) = @_; my $pattern = '\b\w*'.$wordbit.'\w*\b'; return $self->search($pattern); } 1; We can use this object class to perform simple searches on documents read in by the constructor, in an object-oriented style: #!/usr/bin/perl # search.pl use warnings; use strict; use IO::File; use Document; my $fh = new IO::File('file.txt'); my $document = new Document($fh);

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