The Pragmatic Programmer by Andrew Hunt David Thomas & David Thomas

Author:Andrew Hunt,David Thomas & David Thomas
Language: eng
Format: epub
Publisher: Pearson Education Limited (US titles)
Published: 2000-04-10T04:00:00+00:00

Workflow

On many projects, we need to model and analyze the users' workflows as part of requirements analysis. We'd like to find out what can happen at the same time, and what must happen in a strict order. One way to do this is to capture their description of workflow using a notation such as the UML activity diagram.[4]

[4] For more information on all of the UML diagram types, see [FS97].

An activity diagram consists of a set of actions drawn as rounded boxes. The arrow leaving an action leads to either another action (which can start once the first action completes) or to a thick line called a synchronization bar. Once all the actions leading into a synchronization bar are complete, you can then proceed along any arrows leaving the bar. An action with no arrows leading into it can be started at any time.

You can use activity diagrams to maximize parallelism by identifying activities that could be performed in parallel, but aren't.

Tip 39

Analyze Workflow to Improve Concurrency

For instance, in our blender project (Exercise 17, page 119), users may initially describe their current workflow as follows.

Open blender

Open piña colada mix

Put mix in blender

Measure 1/2 cup white rum

Pour in rum

Add 2 cups of ice

Close blender

Liquefy for 2 minutes

Open blender

Get glasses

Get pink umbrellas

Serve

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