Wirfs-Brock, R: Object Design

Responsibilities. Testing Your Candidates' Quality. Summary. Further Reading. 5. Collaborations. What Is Object Collaboration? Preparing for Collaboration. Recording Candidate Collaborations. The Design Story for the Speak for Me Software. Collaboration Options. Who's In Control? How Much Should Objects Trust One Another? Strategies for Identifying Collaborations. Looking at an Individual Object's Role: Stereotypes Imply Collaborations. Looking at Individual Responsibilities: They Imply Collaborations. Designing the Details of a Complex Responsibility. Designing Collaborations for a Specific Task. Identifying Applicable Patterns. Identifying How Architecture Influences Collaborations. Solving Problems in Collaborations. Simulating Collaborations. Planning a Simulation. Running a Simulation. Designing Good Collaborations. The Law of Demeter: A Case Study. Making Collaborations Possible. Guidelines for Making Connections. Designing Reliable Collaborations. When Are We Finished? Summary. Further Reading. 6. Control Style. What Is Control Style? Control Style Options. Making Trade-offs. Centralizing Control. Delegating Control. The Limits of Control Decisions. Developing Control Centers. A Case Study: Control Style for External User Events. Centralizing Control in the MessageBuilder. Refactoring Decision Making into State Methods within the MessageBuilder. Abstracting Away Decisions. Delegating More Responsibility. Designing the Control Style for the Guessing Neighborhood. Designing a Similar Control Center: Can We Be Consistent? Summary. 7. Describing Collaborations. Telling Collaboration Stories. A Strategy for Developing a Collaboration Story. Establishing Scope, Depth, and Tone. Listing What You Will Cover. Deciding on the Level of Detail. Showing a Bird's-Eye View. Showing Collaborators Only. Showing a Sequence of Interactions Among Collaborators. Showing an In-Depth View. Showing a Focused Interaction. Showing an Implementation View. Showing How to Adapt a Collaboration. Where UML Diagrams Fall Short. Choosing the Appropriate Form. Tell It, Draw It, Describe It: Guidelines. Organizing Your Work. Adding Emphasis. Unfolding Your Story. Understanding What's Fundamental. Putting It All Together. Preserving Stories. Summary. Further Reading. 8. Reliable Collaborations. Understanding the Consequences of Failure. Increasing Your System's Reliability. Determining Where Collaborations Can Be Trusted. Trusted Versus Untrusted Collaborations. Implications of Trust. Identifying Collaborations to Be Made Reliable. What Use Cases Tell Us. Distinguish Between Exceptions and Errors. Object Exceptions Versus Use Case Exceptions. Object Exception Basics. Exception- and Error-Handling Strategies. Determining Who Should Take Action. Designing a Solution. Brainstorm Exception Conditions. Limit Your Scope. Record Exception-Handling Policies. Documenting Your Exception-Handling Designs. Specifying Formal Contracts. Reviewing Your Design. Summary. Further Reading. 9. Flexibility. What Does It Mean to Be Flexible? Degrees of Flexibility. The Consequences of a Flexible Solution. Nailing Down Flexibility Requirements. Recording Variations. Variations and Realizations. Identifying the Impact of a Variation. Exploring Strategies for Realizing Flexibility. Using Templates and Hooks to Support Variations. The Role of Patterns in Flexible Designs. Varying an Object's Behavior with the Strategy Pattern. Hiding Interacting Objects with Mediator. Making a Predefined Object or System Fit Using Adapter. How Do Patterns Increase Flexibility? How to Document a Flexible Design. Consider Your Audience. Describing How to Make a Variation. Changing a Working System's Design. Summary. Further Reading. 10. On Design. The Nature of Software Design. Tackling Core Design Problems. Frame the Problem. Dealing with Revealing Design Problems. A Story About Managing Shared Information. A Story About Connection Problem Complexity. A Story About a Design Problem That Never Got Easier. Can Revealing Problems Be Wicked, Too? Strategies for Solving Revealing Problems. Redefining the Problem. Synthesizing a Solution. Working on the Rest. Designing Responsibly. Further Reading. Bibliography. Index. 0201379430T10212002