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This implementation illustrates the different kinds of business logic. You ll see this method again in chapter 10, where we discuss more architectural decisions. In this implementation, you start with some guard clauses, and then you perform the action itself (assigning the bid to the item). The guard clauses are the if statements before the action takes place. They prevent the user from doing something that goes against the rules of the business. In this example, you use guard clauses to prevent someone placing a lower bid than the current one or placing a bid on an item that has already been sold. Sometimes, business logic must be executed at a specific time. For example, if some validation logic must be performed before saving an entity, you can add a Validate() method to the entity. Suppose you already have code such as this:

SWITCH: for ($self->{align}) { /^just/i and !$last and do { $self->_draw_justified_line($y, @_); last SWITCH; }; my $line = join(' ', @_); my $len = $self->_get_width($line); /^right/i and do { my $x = $self->{right} - $len; $self->{gd}->stringTTF($self->{color}, $self->{font}, $self->{font_size}, 0, $x, $y, $line); last SWITCH; }; /^center/i and do { my $x = ($self->{left} + $self->{right})/2 $len/2; $self->{gd}->stringTTF($self->{color}, $self->{font}, $self->{font_size}, 0, $x, $y, $line); last SWITCH; }; my $x = $self->{left}; $self->{gd}->stringTTF($self->{color}, $self->{font}, $self->{font_size}, 0, $x, $y, $line); } }

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Whoa, wait a minute. What s with that copying and not retaining You want to make copies of string arguments. A common error is to get a string from the user interface, like a text field, and use that as something s name. The strings you get from text fields are typically mutable strings and will change when the user types something new. Making a copy of the string prevents the value from changing unexpectedly. Now, what about not retaining objects There is a special case, called a retain cycle, in which reference counting breaks down. If you have an owner/owned relationship, as between Car and Engine, you want the car to retain (own) the engine but not the other way around. The engine should not retain the car it has been installed in. If the car retains the engine, and the engine retains the car, then neither reference count will go to zero, and neither will ever be cleaned up. Car s dealloc won t get called until the engine releases the car in its dealloc, and the engine s dealloc won t get called until car s dealloc releases the Engine. They just sit there, staring at each other, waiting for the other to blink. The general rule is that the owner object retains the ownee object, and not the other way around. Lucky garbage collection users don t need to worry about this case.

Criteria criteria = session.createCriteria(User.class); criteria.add( Restrictions.like("firstname", "John") ); List result = criteria.list();

System.Web.Mvc.Controller is only one option you can choose as a base class for your controllers. It s often appropriate to create your own layer supertype for all your controllers. This type can inherit from System.Web. Mvc.Controller, implement IController, or derive from any other controller base class.

peril, since humans aren t typically very good at boring repetitive work. Luckily for us, computers thrive on boring and repetitive work. The first Xcode feature to help us here doesn t actually manipulate code but installs a safety net. Chose File Make Snapshot (or its handy shortcut, command-control-S) and Xcode will remember the state of your project. You re now free to edit source files and fold, spindle, and mutilate your stuff all you want. If you realize you ve made a terrible mistake, you can use the snapshots window, which you can access from File Snapshots, to recover from a previous snapshot. It s a good idea to take a snapshot before doing anything too adventurous.

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