Object Design Style Guide

Chapter 7. Performing tasks

This chapter covers

• Using command methods to perform tasks
• Using events and event listeners to split up larger tasks
• Dealing with failure in command methods
• Introducing abstractions for commands
• Creating test doubles for command calls

Besides retrieving information from objects, you can use objects to perform a variety of tasks for you:

• Send a reminder email
• Save a record in the database
• Change the password of a user
• Store something on disk
• And so on . . .

The following sections provide rules for methods that perform tasks like these.

7.1. Use command methods with a name in the imperative form

We already discussed query methods and how you should use them to retrieve information. Query methods have a specific ...