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Gradle Summit 2017 - Multi repo development with Composite Builds - Daz DeBoer

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Published on Jun 23, 2017

Working with large projects across multiple teams requires a modular approach to software development, but traditional developer tooling hasn't made it easy. Working with code located in multiple repositories tends to be cumbersome, and at times painful.

Gradle Composite Builds aim to ease some of this pain, by allowing you to combine multiple independent Gradle builds into an integrated whole.

This presentation will demonstrate the use of Composite Builds to modularize a monolithic software project and to work on code living across multiple repositories. With a few simple techniques, you'll learn how to use composite builds to streamline your multi-repository development, from IDEs to CI pipelines.

What are composite builds?
Composite Builds allow you to combine multiple independent Gradle builds into a single integrated build. Binary dependencies are automatically replaced with project dependencies, and when you make a change to an upstream component, it is immediately visible to its dependents. You can import composite builds into the IDE and work on them as if you were looking at a single code base.

Composite builds also simplify the process of splitting a large mono-repo into smaller parts that can be worked on individually. This makes the migration path toward separated repositories simple. And thanks to Gradle's rich DSL, you can compose builds dynamically.

What you'll learn
Starting with a monolithic mono-repo application, this presentation will demonstrate how composite builds can be used in a number of common development scenarios:

Debug and patch an upstream dependency that lives in a separate repository
Extract and publish a library dependency from a monolithic application
Extract and publish a Gradle plugin from custom build logic
Compose a workspace for co-development of several separate Gradle projects

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