{"id":24435,"date":"2026-01-29T13:06:44","date_gmt":"2026-01-29T12:06:44","guid":{"rendered":"https:\/\/conferences.isaqb.org\/software-architecture-gathering\/?p=24435"},"modified":"2026-01-29T14:11:39","modified_gmt":"2026-01-29T13:11:39","slug":"sag-2025-keynote-alistair-cockburn-the-hexagonal-or-ports-adapters-architecture","status":"publish","type":"post","link":"https:\/\/conferences.isaqb.org\/software-architecture-gathering\/sag-2025-keynote-alistair-cockburn-the-hexagonal-or-ports-adapters-architecture\/","title":{"rendered":"SAG 2025 \u2013 Keynote Alistair Cockburn: “The Hexagonal, or Ports & Adapters Architecture”"},"content":{"rendered":"\t\t
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iSAQB Software Architecture Gathering 2025\u200b<\/p>\n\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t<\/section>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Alistair Cockburn<\/a><\/h6>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Heart of Agile<\/span><\/a><\/h6>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t
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Published on January 28, 2026<\/h6>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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SAG 2025 \u2013 Keynote Alistair Cockburn: \"The Hexagonal, or Ports & Adapters Architecture\"<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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As part of the ongoing publication of the SAG 2025 keynote recordings, we begin with a foundational talk by one of the most influential figures in software architecture: Alistair Cockburn. In his keynote \u201cThe Hexagonal, or Ports & Adapters Architecture\u201d, Cockburn revisits an architectural style that has shaped how many teams think about structure, boundaries, and long-term maintainability.\n\n
Rather than presenting the pattern as an abstract concept, the keynote focuses on the motivations that led to its creation. Drawing on decades of practical experience, Cockburn explains which recurring problems in real-world systems Ports & Adapters was designed to address \u2013 especially tight coupling between business logic and technical concerns, and the resulting fragility when technologies change.<\/i><\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Why Ports & Adapters Exists<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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At the core of the keynote is a deceptively simple challenge: can an application run without a user interface or a database? Cockburn uses this question to demonstrate how Ports & Adapters shifts the architectural focus toward the application core. By placing interfaces (ports) inside the application and keeping all technical implementations (adapters) outside, the business logic becomes independent of specific technologies.

\n\nThe talk walks through concrete examples in Java and Ruby, illustrating how driving ports, driven ports, and their adapters interact. Cockburn emphasizes that adapters always live outside the application boundary \u2013 a detail that is frequently misunderstood in practice. This separation enables applications to replace databases, UIs, or external services without modifying the core logic, and without requiring extensive rewrites.

\n\nA recurring theme throughout the keynote is the role of tests. Cockburn argues that tests are not just consumers of the application, but its first and most important users. Automated tests, built against the ports of the application, are what ultimately prevent business logic from leaking into infrastructure code \u2013 and vice versa. Without such tests, architectural boundaries tend to erode over time, regardless of how clearly they are documented.

\n\nKey Takeaways:<\/b>

\n\n1. Ports & Adapters focuses on inside vs. outside, not on layers
\n2. Interfaces for both driving and driven ports belong inside the application
\n3. Adapters always live outside the application boundary
\n4. Tests act as the first and most critical user of the system
\n5. Clear folder and package structures significantly support architectural clarity
\n6. The approach enables long-term evolution without rewriting the core

\n\nThe keynote is aimed at software architects and developers working on long-lived systems who want to design software that can adapt to changing technologies while keeping the core stable.<\/b><\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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You are currently viewing a placeholder content from YouTube<\/strong>. To access the actual content, click the button below. Please note that doing so will share data with third-party providers.<\/p> More Information<\/a> <\/div>

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The Hexagonal, or Ports & Adapters Architecture (Keynote)<\/a><\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Blog iSAQB Software Architecture Gathering 2025? Alistair Cockburn Heart of Agile Published on January 28, 2026 SAG 2025 \u2013 Keynote Alistair Cockburn: “The Hexagonal, or Ports & Adapters Architecture” As part of the ongoing publication of the SAG 2025 keynote recordings, we begin with a foundational talk by one of the most influential figures in…<\/p>\n","protected":false},"author":201909760,"featured_media":24434,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1364],"tags":[1753,1446,1770,1754,1438,1773,1756,1771,1435,1772],"post_folder":[],"yoast_head":"\nSAG 2025 \u2013 Keynote Alistair Cockburn<\/title>\n<meta name=\"description\" content=\"Watch Alistair Cockburn\u2019s SAG 2025 keynote on Hexagonal (Ports & Adapters) Architecture and learn how to build testable, flexible, and long-lived software systems.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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