Gunnar Morling • 5/4/2020

The Emitter Parameter Pattern for Flexible SPI Contracts

This technical article introduces the Emitter Parameter Pattern for designing Service Provider Interfaces (SPIs) in software libraries. Using a blog post data extraction example, it argues that passing an 'emitter' object as a method parameter is more flexible than using return values, as it avoids issues with multi-pass processing, immutable return types, and future API evolution.

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#api design #software architecture #design patterns