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To restate: 1. 2. First, we declare that our object has a property with a specific type. Second, we instruct the computer to implement or synthesize this information.

Take a concept statement and define detailed requirements and the externally visible characteristics of the system. Write a validation plan that maps to the requirements specification. Short form: Is it possible to resolve the requirements Define the context of the system via use cases and scenarios. External messages, events, and actions are defined. The system is treated as a black box. Use care and scenario models are the deliverables. For real-time systems, characterize the sequence and synchronization details of the messages/responses. Short form: What would the big picture solution look like Identify the classes, objects, and associations that solve the problem, using class and object diagrams. Response behavior is modeled using state charts. Interaction among objects is shown with sequence or collaboration diagrams. Short form: A further refinement of the big picture solution arrived at by decomposing subsystems into high-level classes.

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TABLE 3-1

2

We tell the compiler about our object by declaring it, including specific descriptive parameters. Then, we give the compiler the go-ahead to implement our object by telling it to synthesize the object. But how do we do this declaring and implementing We use tools in our code called directives. We signal directives by inserting @ before stating our directive. This means that to declare what property our object has we put the @ symbol in front of the word property to make it a property directive: @property. When we see @property in our code, we know it s a property directive. Similarly, when we want to tell the compiler to process and synthesize, that is to do its stuff on our object, we put the @ symbol in front of our synthesis statement: @synthesize. Saying the exact same thing we said before, but translated into geekspeak, we get: 1. 2. The @property directive declares that our object has a property with a specific type. The @synthesize directive implements the methods we declared in the @property directive.

Project Life Cycle Phases (continued)

(2.61)

Define the important architectural decisions. Physical architecture of the system is modeled using deployment diagrams, software component architecture is modeled using component diagrams, and concurrency models are captured using class diagrams identifying the active objects. Design patterns are used here as well. Note: One key element of design is that hard dependencies on specific hardware, software, and other infrastructure is fleshed out as we move closer to implementation. For example, an architect may decide to use BEA WebLogic as the J2EE server. A designer may find that, while trying to build some XML parsing components, a decision needs to be made about whether to use BEA-specific APIs or perhaps use JAXP APIs. Define the collaborative behavior of classes and objects. This information is captured on class and object diagrams. Sequence and collaboration diagrams capture specific instances of collaborations and state charts are enhanced to define the full behavior. Define the detailed behavior and structure of individual classes using activity diagrams and notations. Develop class code, database definition, and message structures in the target language, DBMS, and messaging system.

Test the internal structure and behavior of each class. Test the integration of various components. This takes place recursively at multiple levels of decomposition based on the scale of the system. Test the delivered system against the requirements as defined in the validation test plan. Pass the delivered system and user guide and other operational documentation to the user and technical support staff.

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Easy, huh OK, just two more points now, and then we ll get back to our code. The first elaboration I want to make regarding step 1 is that we also need to specify whether this property will be read-only or read-write. In other words, we need to specify whether it will always stay the same or whether it can mutate into something new. In geekspeak, we call this mutability. For the most part, we will use Apple code to handle the mutability of properties with respect to our objects.

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