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Note Axapta allows developers to specify whether an Axapta object type known as the Class should execute on the client or server; the Class-type object is a performance-enhancing feature of 3-tier mode.

Caution All of the testing antipatterns described in this chapter are based on the point of view of improving testability. There may well be other concerns that trump this particular concern e.g., in massively parallel, highperformance computing applications, factors such as execution efficiency and memory usage have to trump classlevel encapsulation. As with most considerations in software design, it s a case of weighing up what s most important for this project, and producing a design to match.

The presentation layer, achieved with Cascading Style Sheets, describes how the content should be displayed. You can use CSS to declare, Paragraphs should be colored grey and use Arial or some other sans-serif font : p { color: grey; font-family: "Arial", sans-serif; }

Note Although the 3-tier fat mode off-loads processing to the clients and improves system performance,

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it fails to take into account synchronization issues between fat and thin 3-tier clients, security issues, etc.; the disadvantages far outweigh the advantages, so think twice before going ahead with a 3-tier fat client configuration.

The Temple of Doom (aka The Code)

Finally, the behavior layer describes how the content should react to events. This is where JavaScript and the DOM rule the roost. Using the DOM, you can specify, When the user clicks on a paragraph, display an alert dialog :

Note The client binary is exactly the same whatever mode you run it in. The difference in client behavior

We ve built this entire chapter around a single code example. We refer to that example as The Temple of Doom, because in it we ve consolidated what we believe to be the ten worst antipatterns (or suicidal practices) that make unit testing really difficult. We ve marked each of our suicidal practices with an image of Ixtab, the Mayan goddess of suicide: 10. The complex constructor 9. 8. 7. 6. 5. 4. 3. 2. 1. The stratospheric class hierarchy The static hair-trigger Static methods and variables The Singleton design pattern The tightly bound dependency Business logic in the UI code Privates on parade Service objects that are declared final Half-baked features from the Good Deed Coder

is determined exclusively by the configuration it s started with. A client installed on a computer can be switched from one mode to another by simply firing it up with a different configuration.

var paras = document.getElementsByTagName("p"); for (var i=0; i<paras.length; i++) { paras[i].onclick = function() { alert("You clicked on a paragraph."); } }

The Axapta architecture has the ability to simultaneously support combinations of 2-tier and 3-tier client setups on the same application and database. In practice, this means that you install your database, application, and AOSs, and then deploy different types of clients based on what best fits particular user groups and the requirements of their physical environment. You can deploy and mix the following client setups: 2-tier: Handles user interaction, executes the application, and accesses the database directly. 3-tier fat: Handles user interaction and accesses the database directly the AOS executes the application on their behalf. 3-tier thin: Handles user interaction the AOS executes the application and accesses the database on their behalf. This is done using the client configuration utility discussed in 2. All these clients can work together and simultaneously in the same system, but there are a few things to keep in mind: Clients must all share the same application (i.e., 2-tier clients must specify the same application as specified by the AOS for thin and fat 3-tier clients, or they will execute different object definitions and code). Clients must all share the same database (i.e., 2-tier and fat 3-tier clients must specify the same database specified by the AOS for thin 3-tier clients, or they will not work with the same data).

All of these (very common) code constructs make your code difficult to unit-test. We re going to present a Java class implementing all ten at once, so brace yourselves for the big blob of bloated bleariness.

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