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Software Fortresses: Modeling Enterprise Architectures by Janet Van Sickler, Roger Sessions

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12.1. Legacy Fortresses

Legacy fortresses wrap existing prefortress systems and allow them to work within the context of an enterprise fortress architecture.

There are arguments in favor of keeping existing systems and arguments in favor of discarding them. On the keep side, existing systems usually work and often represent huge investments. On the discard side, existing systems are often difficult or impossible to modify, they often run on expensive mainframe configurations, and they are sometimes designed in ways that make them rather hostile to enterprise-level collaboration.

I usually take a conservative approach to legacy systems. If the system can be wrapped relatively easily in a legacy fortress archi tecture, then I recommend this approach. ...

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