Field Notes: Using the Template Method Pattern
Sometimes a class will use several different Strategy patterns. When I first looked at the class diagram for the Template Method, I thought, “Oh, the Template Method is simply a collection of Strategies that work together.” This is dangerous (and usually incorrect) thinking. While it is not uncommon for several Strategies to appear to be connected to each other, designing for this can lead to inflexibility.
The Template Method is applicable when there are different, but conceptually similar processes. The variations for each process are coupled together because they are associated with a particular process. In the example I presented, when I need a format a CONNECT command for an Oracle database, ...
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