Bridge
The bridge pattern takes the adapter pattern to a new level. Given an interface, we can build multiple adapters, each one of which acts as an intermediary to a different implementation.
An excellent example that I've run across, is dealing with two different services that provide more or less the same functionality and are used in a failover configuration. Neither service provides exactly the interface required by the application and both services provide different APIs. In order to simplify the code, adapters are written to provide a consistent interface. The adapters implement a consistent interface and provide fills so that each API can be called consistently. To expand on the shape sorter metaphor a bit more, we can imagine that we have ...
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