Branch by abstraction by paul hammant agileindia2020

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branch by abstraction: a deep dive into decoupling change

branch by abstraction, popularized by paul hammant in his 2020 agile india talk (which, while not formally published, has been widely discussed and practiced), is a powerful refactoring technique that allows you to introduce significant changes to a codebase without creating long-lived feature branches and the associated integration headaches. it decouples the introduction of a new implementation from the removal of the old one, minimizing risk and allowing for incremental adoption.

this tutorial will provide a comprehensive understanding of branch by abstraction, covering:

1. **the problem: why feature branches often fail**
2. **the core principle: decouple change and release**
3. **the technique: branch by abstraction explained**
4. **steps for implementing branch by abstraction**
5. **code example: migrating a database access layer**
6. **benefits and drawbacks**
7. **when to use branch by abstraction**
8. **tools and techniques to support branch by abstraction**
9. **common mistakes to avoid**
10. **alternatives and variations**
11. **conclusion**

**1. the problem: why feature branches often fail**

traditional feature branching involves creating a separate branch for each new feature or significant refactoring effort. while seemingly intuitive, this approach can lead to numerous problems, especially in long-lived branches:

* **merge hell:** merging long-lived branches can be incredibly complex, time-consuming, and error-prone. conflicts are common, requiring developers to spend significant time resolving them instead of building features.
* **code drift:** the code in the feature branch diverges from the main branch over time, leading to integration issues when the branch is finally merged.
* **delayed integration:** integration is postponed until the feature is "complete," which can be a long and unpredictable process. this delays feedback and increases the risk of major in ...

#BranchByAbstraction #PaulHammant #bytecode
Branch by abstraction
Paul Hammant
Agile India 2020
software development
agile methodology
feature toggles
code branching
continuous integration
software architecture
microservices
test-driven development
DevOps practices
feature flags
release management
agile software engineering

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