46 lines
1.7 KiB
Markdown
46 lines
1.7 KiB
Markdown
---
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layout: pattern
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title: Fluent Interface
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folder: fluentinterface
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permalink: /patterns/fluentinterface/
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pumlid: NOj93eCm302_KXv0VEzlN6F0bMCYB_3zvjpRQ3IpY97MnkNwEZD7l04SdtP8dlMfOAVBaYqRNHr4wy54Xo_Uk6uSSjWwC9FT0Zh61DYrPY_pyXs9WPF-NIllRLJN7m00
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categories: Other
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tags:
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- Java
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- Difficulty-Intermediate
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- Functional
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---
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## Intent
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A fluent interface provides an easy-readable, flowing interface, that often mimics a domain specific language. Using this pattern results in code that can be read nearly as human language.
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## Implementation
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A fluent interface can be implemented using any of
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* Method Chaining - calling a method returns some object on which further methods can be called.
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* Static Factory Methods and Imports
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* Named parameters - can be simulated in Java using static factory methods.
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## Applicability
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Use the Fluent Interface pattern when
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* you provide an API that would benefit from a DSL-like usage
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* you have objects that are difficult to configure or use
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## Real world examples
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* [Java 8 Stream API](http://www.oracle.com/technetwork/articles/java/ma14-java-se-8-streams-2177646.html)
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* [Google Guava FluentInterable](https://github.com/google/guava/wiki/FunctionalExplained)
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* [JOOQ](http://www.jooq.org/doc/3.0/manual/getting-started/use-cases/jooq-as-a-standalone-sql-builder/)
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* [Mockito](http://mockito.org/)
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* [Java Hamcrest](http://code.google.com/p/hamcrest/wiki/Tutorial)
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## Credits
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* [Fluent Interface - Martin Fowler](http://www.martinfowler.com/bliki/FluentInterface.html)
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* [Evolutionary architecture and emergent design: Fluent interfaces - Neal Ford](http://www.ibm.com/developerworks/library/j-eaed14/)
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* [Internal DSL](http://www.infoq.com/articles/internal-dsls-java)
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