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The Magic of Feature Toggles 

王天甫 (Aki Wang) 許子庭 (Noah Hsu) 

Feature Toggle 

Function A Function B 

Function A Function B 

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@RestController public class LayoutController { @GetMapping("/layouts/order") public ResponseEntity getLayoutOrder() { return ResponseEntity.ok(buildLayoutOrder()); } private Map buildLayoutOrder() { throw new UnsupportedOperationException("Not implemented yet"); } } 

@RestController public class LayoutController { @GetMapping("/layouts/order") public ResponseEntity getLayoutOrder() { boolean isLayoutOrderEnabled = false; if (isLayoutOrderEnabled) { return ResponseEntity.ok(buildLayoutOrder()); } else { return ResponseEntity.notFound().build(); } } private Map buildLayoutOrder() { throw new UnsupportedOperationException("Not implemented yet"); } } 

BUY NOW BUY NOW V S 

@RestController public class LayoutController { @GetMapping("/layouts/order") public ResponseEntity getLayoutOrder() { return ResponseEntity.ok(buildLayoutOrder()); } private Map buildLayoutOrder() { return Map.of("color", "blue", "radius", "8px", "pos", "page"); } } 

@RestController public class LayoutController { @GetMapping("/layouts/order") public ResponseEntity getLayoutOrder() { return ResponseEntity.ok(buildLayoutOrder()); } private Map buildLayoutOrder() { return Map.of("color", "green", "radius", "0px", "pos", "bottomNav"); } } 

@RestController public class LayoutController { @GetMapping("/layouts/order") public ResponseEntity getLayoutOrder() { String themeName = "themeB"; switch (themeName) { case "themeB": return ResponseEntity.ok(buildThemeBLayoutOrder()); default: return ResponseEntity.ok(buildThemeALayoutOrder()); } } private Map buildThemeALayoutOrder() { return Map.of("color", "blue", "radius", "8px", "pos", "page"); } private Map buildThemeBLayoutOrder() { return Map.of("color", "green", "radius", "0px", "pos", "bottomNav"); } } 

Invisibility Speed Experimentation Safety Live Update 

longevity dynamism Release Toggles Ops Toggles Permission Toggles Experiment Toggles years months weeks days changes with a deployment changes with runtime re-configuration changes with each request from https://martinfowler.com/articles/feature-toggles.html 

Feature Toggle is second best solution. The best solution is to find a way to gradually integrate, without Feature Branches or Feature Toggles 

Flagship4j 

Standardizing Feature Flagging for Everyone 

One SDK, any backend Supports your favorite tools Speaks your language 

One SDK, any backend OpenFeatureAPI api = OpenFeatureAPI.getInstance(); api.setProvider(new OpenFlagrProvider()); Client client = api.getClient(); Boolean isHelloWorldEnabled = client.getBooleanValue("hello-world-enabled", false); if (isHelloWorldEnabled) { System.out.println("Hello World"); } 

Supports your favorite tools 

Speaks your language 

OpenFlagr Open source feature flagging, A/B testing, and dynamic configuration microservice in Go. 

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USE CASES 

ON On / Off 100% 

ON Rollout 100% 

Blue A / B Testing Green 50% 50% 

Q & A 

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