DDD, Anti Corruption layer, how-to?

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From the DDD book (Domain-Driven Design: Tackling Complexity in the Heart of Software) by Eric Evans:

The public interface of the
ANTICORRUPTION LAYER usually appears
as a set of SERVICES, although
occasionally it can take the form of
an ENTITY.

and a bit later

One way of organizing the design of
the ANTICORRUPTION LAYER is as a
combination of FACADES, ADAPTERS (both
from Gamma et al. 1995), and
translators, along with the
communication and transport mechanisms
usually needed to talk between
systems.

So, you might find examples by looking at the suggested adapter pattern and facade pattern.

I’ll try to paraphrase what Eric Evans said, your anti-corruption layer will appear as services to the outside of your layer. So outside of the anti-corruption layer the other layers will not know they are “speaking” with a anti-corruption layer. Inside of the layer you would use adapters and facades to wrap your legacy information sources.

More information about the anti-corruption layer:

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