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LEGACY to MOBILE FIRST Stewart Gleadow | REA Group | [email protected] | @stewgleadow

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ARCHITECTURE GUIDELINES DEALING WITH LEGACY TECHNICAL CHALLENGES DELIVERY TEAM STRUCTURE 1. 2. 3. 4.

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ARCHITECTURE GUIDELINES DEALING WITH LEGACY TECHNICAL CHALLENGES DELIVERY TEAM STRUCTURE 1. 2. 3. 4.

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OUR IDEAL ARCHITECTURE

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Easy to adapt, quick to extend Deployed in the cloud OUR IDEAL ARCHITECTURE

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SUGGEST small SERVICES LISTINGS USERS

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LISTINGS USERS SUGGEST {…} {…} {…} API DRIVEN

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MOBILE API simple CLIENTS

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LISTINGS USERS SUGGEST MOBILE API

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THE RULES ARE MORE WHAT YOU’D call GUIDELINES

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ARCHITECTURE GUIDELINES DEALING WITH LEGACY TECHNICAL CHALLENGES DELIVERY TEAM STRUCTURE 1. 2. 3. 4.

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LEGACY JAVA

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LEGACY JAVA

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LEGACY JAVA API

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LEGACY JAVA API

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LEGACY JAVA API

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IT’S DIFFICULT TO evolve and maintain MONOLITHIC SYSTEMS

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LEGACY JAVA residential LEGACY JAVA commercial

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LEGACY JAVA residential LEGACY JAVA commercial API API

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LEGACY JAVA API

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LEGACY JAVA SEARCH API LISTINGS

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LEGACY JAVA SEARCH API USERS LISTINGS

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LEGACY JAVA SEARCH API LISTINGS USERS

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LEGACY JAVA SEARCH API LISTINGS USERS

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_links : { autosuggest : { href : “https://autosuggest.realestate.com.au/suburbs{/address}”, templated : true }, search : { href : “https://listings.realestate.com.au/listings{?query}”, templated : true }, login : { href : “https://users.realestate.com.au/users”, templated : false } } JSON endpoint configuration

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Static site in an S3 bucket

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Scala API Java API Ruby API

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Javascript UI library

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ARCHITECTURE GUIDELINES DEALING WITH LEGACY TECHNICAL CHALLENGES DELIVERY TEAM STRUCTURE 1. 2. 3. 4.

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LEGACY JAVA SEARCH API USERS LISTINGS (artists impression)

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LEGACY JAVA SEARCH API USERS LISTINGS (artists impression)

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LEGACY JAVA SEARCH API USERS SUGGEST SAVED LISTINGS (artists impression)

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LEGACY JAVA SEARCH API USERS SUGGEST SAVED LISTINGS

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LEGACY JAVA SEARCH API USERS SUGGEST SAVED LISTINGS

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© Igor Motov, Spiderweb, http://www.flickr.com/photos/71411059@N00/6171222658/ (modified). Creative Commons 4.0 Traded a complicated monolith for a complex web of interacting services

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{…} LISTINGS USERS {…}

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{…} LISTINGS USERS Pact: consumer driven contact testing {…} github.com/realestate-com-au/pact github.com/dius/pact-jvm

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my_service_provider. given("something exists"). upon_receiving("a request for something”). with(method: :get, path: '/something'). will_respond_with( status: 200, headers: {'Content-Type' => 'application/json'}, body: {name: 'A small something'} ) ! subject.get_something

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FREEDOM vs CONSISTENCY

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Freedom within a service but consistency in deployment and interactions

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COOKIE-CUTTER APPROACH TO NEW SERVICES

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LISTINGS USERS SUGGEST LISTINGS USERS SUGGEST PROD STAGING

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LISTINGS USERS SUGGEST LISTINGS USERS SUGGEST PROD STAGING

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USERS LISTINGS USERS SUGGEST (new version)

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USERS LISTINGS USERS SUGGEST (new version)

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USERS LISTINGS USERS SUGGEST (new version)

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_links : { autosuggest : { href : “https://autosuggest.realestate.com.au/suburbs{/address}”, templated : true }, search : { href : “https://listings.realestate.com.au/listings{?query}”, templated : true }, login : { href : “https://users.realestate.com.au/users”, templated : false } } Use entry points to test different environments

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_links : { autosuggest : { href : “https://autosuggest.realestate.com.au/suburbs{/address}”, templated : true }, search : { href : “https://listings.realestate.com.au/listings{?query}”, templated : true }, login : { href : “https://users.realestate.com.au/users”, templated : false } } Use entry points to test different environments

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_links : { autosuggest : { href : “https://autosuggest.realestate.com.au/suburbs{/address}”, templated : true }, search : { href : “https://listings.realestate.com.au/listings{?query}”, templated : true }, login : { href : “https://users.realestate.com.au/users”, templated : false } } Use entry points to test different environments “https://users.test.realestate.com.au/users”

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ARCHITECTURE GUIDELINES DEALING WITH LEGACY TECHNICAL CHALLENGES DELIVERY TEAM STRUCTURE 1. 2. 3. 4.

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ruby JAVA iOS

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ruby JAVA iOS “mobile team”

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ruby JAVA iOS “mobile team”

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ruby JAVA iOS “mobile team”

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ruby JAVA iOS Cross-functional squads

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Mobile team? Treat the apps as a product http://en.wikipedia.org/wiki/IPhone_5S End-to-end delivery of an app experience

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ARCHITECTURE GUIDELINES DEALING WITH LEGACY TECHNICAL CHALLENGES DELIVERY TEAM STRUCTURE 1. 2. 3. 4.

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COMPLEX SOFTWARE SYSTEMS ARE still hard

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http://en.wikipedia.org/wiki/Lego SMALL SERVICES SIMPLE CLIENTS POWERFUL APIs

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THANKS

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THANKS

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STEWART GLEADOW stewgleadow.com/talks @stewgleadow [email protected] REA Group / realestate.com.au Talks: Twitter: Email:

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REFERENCES • Martin Fowler, Microservices: http://martinfowler.com/articles/microservices.html • Sam Newman, Demistifying Conways Law: http://www.thoughtworks.com/insights/blog/demystifying-conways-law • Michael Feathers, Microservices Until Macro Complexity: https://michaelfeathers.silvrback.com/microservices-until-macro-complexity • Anthony Green, What Is A Microservice And Why Does It Matter: http://www.brunton-spall.co.uk/post/2014/05/21/what-is-a-microservice-and-why-does-it-matter • Richard Clayton, Failing At Microservices: https://rclayton.silvrback.com/failing-at-microservices • Fred George, Microservices Architecture: http://yow.eventer.com/yow-2012-1012/micro-services-architecture-by-fred-george-1286 • Todd Hoff, Microservices Not A Free Lunch: http://highscalability.com/blog/2014/4/8/microservices-not-a-free-lunch.html • Martin Fowler, Strangler Application: http://martinfowler.com/bliki/StranglerApplication.html • Mike Kelly, HAL JSON: http://stateless.co/hal_specification.html • Brandon Byars, Enterprise REST: http://martinfowler.com/articles/enterpriseREST.html • Stewart Gleadow, No App Is An Island: https://speakerdeck.com/sgleadow/no-app-is-an-island • Ronald Holshausen, Testing Interactions With Web Services Without Integration Tests In Ruby: http://techblog.realestate.com.au/testing-interactions-with-web-services-without- integration-tests-in-ruby/ • Ian Robinson, Consumer Driven Contracts: http://martinfowler.com/articles/consumerDrivenContracts.html • Beth Skurrie, Pact Github Repository: https://github.com/realestate-com-au/pact • Travis Dixon, Pact JVM Github Repository: https://github.com/DiUS/pact-jvm • Ronald Holshausen, Simlifying Micro-Service Testing With Pacts: http://dius.com.au/2014/05/19/simplifying-micro-service-testing-with-pacts/ • Henrik Kniberg & Anders Ivarsson, Scaling Agile @ Spotify: https://dl.dropboxusercontent.com/u/1018963/Articles/SpotifyScaling.pdf • Sam Newman, Practical Microservices: http://www.slideshare.net/spnewman/practical-microservices-yow-2013