{"id":17983,"date":"2015-01-29T00:00:19","date_gmt":"2015-01-29T00:00:19","guid":{"rendered":"https:\/\/www.fullcontact.com\/?p=17983"},"modified":"2020-03-23T17:09:33","modified_gmt":"2020-03-23T17:09:33","slug":"refactor-or-fail-how-we-rebuilt-fullcontact-from-the-ground-up","status":"publish","type":"post","link":"https:\/\/www.fullcontact.com\/blog\/engineering\/refactor-or-fail-how-we-rebuilt-fullcontact-from-the-ground-up\/","title":{"rendered":"Refactor or Fail \u2014 How We Rebuilt FullContact from the Ground Up"},"content":{"rendered":"<p id=\"8f8d\" class=\"fq fr ck bg fs b ft fu fv fw fx fy fz ga gb gc gd fl\" data-selectable-paragraph=\"\">Today at FullContact we are proud to launch FullContact for iOS. The truth is, it\u2019s been a significant challenge to get here.<\/p>\n<p id=\"1abf\" class=\"fq fr ck bg fs b ft fu fv fw fx fy fz ga gb gc gd fl\" data-selectable-paragraph=\"\">Roughly a year ago, we ran into a pretty common scenario in our industry. We had a platform that was holding us back. Our first attempt at an address book platform a.k.a Address Book 1.0, exhibited serious warning signs of an impaired architecture: We were routinely introducing technical debt to move forward, and delivering quality code at a predictable pace was nearly impossible.<\/p>\n<p id=\"dbcb\" class=\"fq fr ck bg fs b ft fu fv fw fx fy fz ga gb gc gd fl\" data-selectable-paragraph=\"\">It was pretty clear: the biggest challenge in front of us was a monolithic core application built on Grails that had become extremely painful to develop in. Grails wasn\u2019t the entire problem, we simply allowed it to grow to an unsustainable size. There were other equally costly sins:<\/p>\n<ul class=\"\">\n<li id=\"7fc4\" class=\"fq fr ck bg fs b ft fu fv fw fx fy fz ga gb gc gd gi gj gk\" data-selectable-paragraph=\"\">We had large quantities of unit-tests but very few integration tests \u2014 a big problem on its own when you have many moving parts.<\/li>\n<li id=\"843a\" class=\"fq fr ck bg fs b ft gl fv gm fx gn fz go gb gp gd gi gj gk\" data-selectable-paragraph=\"\">We had not paid enough attention to monitoring and tooling; tracking down issues was extremely time-consuming.<\/li>\n<li id=\"f4c3\" class=\"fq fr ck bg fs b ft gl fv gm fx gn fz go gb gp gd gi gj gk\" data-selectable-paragraph=\"\">The storage layer was reaching its limits with the sheer volume of data we were storing<\/li>\n<li id=\"22a6\" class=\"fq fr ck bg fs b ft gl fv gm fx gn fz go gb gp gd gi gj gk\" data-selectable-paragraph=\"\">A combination of Groovy\/Java nullified the advantages of both \u2014 refactorability of statically typed Java and agility of dynamically typed Groovy<\/li>\n<\/ul>\n<p id=\"239a\" class=\"fq fr ck bg fs b ft fu fv fw fx fy fz ga gb gc gd fl\" data-selectable-paragraph=\"\">It was obvious that without some fundamental changes we simply could not move forward. So, last April, we deemed the entire architecture as <a class=\"dz ex ge gf gg gh\" href=\"http:\/\/martinfowler.com\/bliki\/SacrificialArchitecture.html\" target=\"_blank\" rel=\"noopener noreferrer\">sacrificial<\/a>.<\/p>\n<p id=\"c127\" class=\"fq fr ck bg fs b ft fu fv fw fx fy fz ga gb gc gd fl\" data-selectable-paragraph=\"\">Seismic shifts in architecture ironically come with a <a class=\"dz ex ge gf gg gh\" href=\"http:\/\/www.joelonsoftware.com\/articles\/fog0000000069.html\" target=\"_blank\" rel=\"noopener noreferrer\">flashing bright red warning sign<\/a> \u2014 anybody who has ever done a big refactoring will tell you that it\u2019s harder than you anticipate, and the likelihood of failing is probable.<\/p>\n<p id=\"4948\" class=\"fq fr ck bg fs b ft fu fv fw fx fy fz ga gb gc gd fl\" data-selectable-paragraph=\"\">Nevertheless the whole company bought in \u2014 if we didn\u2019t invest in getting the fundamentals solid then we would never be able to move fast enough in future. With everybody on board we set out for The Grind \u2014 a rewrite\/refactor that took quite a bit of time, patience and energy but was ultimately worth it.<\/p>\n<h2 id=\"bd1d\" class=\"gq gr ck bg as at gs gt gu gv gw gx gy gz ha hb hc\">The Grind<\/h2>\n<p id=\"b9e9\" class=\"fq fr ck bg fs b ft hd fv he fx hf fz hg gb hh gd fl\" data-selectable-paragraph=\"\">The obvious place to start was breaking down the big monolithic Grails application into smaller services (a.k.a micro-services architecture). There were a few important questions we still had to answer: What technologies did we want to utilize? What did we want to refactor vs rewrite? How do we make sure the refactoring doesn\u2019t break things? Most importantly, what we will name the new services?<\/p>\n<p id=\"dee0\" class=\"fq fr ck bg fs b ft fu fv fw fx fy fz ga gb gc gd fl\" data-selectable-paragraph=\"\">At this point FullContact is deeply invested into the JVM platform. We have unified deployment, monitoring and our awesome devops team keeps JVM services running smoothly at all times. So sticking with our existing JVM platform for new services was an easy choice.<\/p>\n<p id=\"1cd5\" class=\"fq fr ck bg fs b ft fu fv fw fx fy fz ga gb gc gd fl\" data-selectable-paragraph=\"\">Next\u2026 the fun decision, choosing a language. We decided to remove Groovy from the equation as Java 8 had introduced the things that made Groovy so attractive. We also wanted to take the opportunity to shift to a more functional programming style and Java is less than perfect for that. Luckily there are now two solid functional languages on the JVM platform \u2014 Scala and Clojure. Ultimately we choose Clojure for its core value: simplicity. Java still has important place in our stack \u2014 not everything fits functional programming style and Java\u2019s static typing is very beneficial in certain cases.<\/p>\n<p id=\"1ff9\" class=\"fq fr ck bg fs b ft fu fv fw fx fy fz ga gb gc gd fl\" data-selectable-paragraph=\"\">With our weapon of choice armed and loaded, It was onto the refactor vs rewrite debate. Surprisingly for us, it wasn\u2019t much of one. We made a simple distinction, our core services for storing and retrieving contacts would be refactored into Java based micro-services. All other ancillary services would be rewritten with Clojure and backed by any other technology we deemed necessary to make them successful.<\/p>\n<p id=\"2592\" class=\"fq fr ck bg fs b ft fu fv fw fx fy fz ga gb gc gd fl\" data-selectable-paragraph=\"\">Last but not least, we didn\u2019t want to follow Facebook\u2019s mantra \u201cMove fast and break things\u201d. Our mantra is \u201cBe awesome with people\u201d. Be awesome by not breaking things. Be awesome by making sure our customer\u2019s data is always safe and secure. The answer was meticulously automating integration testing. Instead of spending time unit-testing the smallest functions, we made sure that all our API endpoints and cross system behaviour have complete integration test coverage. This made rewriting code much more relaxing.<\/p>\n<p id=\"db92\" class=\"fq fr ck bg fs b ft fu fv fw fx fy fz ga gb gc gd fl\" data-selectable-paragraph=\"\">We can gladly say we\u2019ve endured \u201cThe Grind\u201d, and paid for our costly sins. Now that we\u2019re through, we\u2019ll be sharing (in great detail) everything we\u2019ve learned in an upcoming series of technical blog posts. The following topics include: Breaking up the monolith (and you can too!), You always had me at Integration Tests, Devops? More like Awesomops, Adventure Time Naming Schemes and Where will Ms. Frizzle take us next.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Today at FullContact we are proud to launch FullContact for iOS. The truth is, it\u2019s been a significant challenge to get here. Roughly a year ago, we ran into a pretty common scenario in our industry. We had a platform that was holding us back. Our first attempt at an address book platform a.k.a Address [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_improvement_type_select":"improve_an_existing","_thumb_yes_seoaic":false,"_frame_yes_seoaic":false,"seoaic_generate_description":"","seoaic_improve_instructions_prompt":"","seoaic_rollback_content_improvement":"","seoaic_idea_thumbnail_generator":"","thumbnail_generated":false,"thumbnail_generate_prompt":"","seoaic_article_description":"","seoaic_article_subtitles":[],"footnotes":""},"categories":[656],"tags":[],"class_list":["post-17983","post","type-post","status-publish","format-standard","hentry","category-engineering"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.1 (Yoast SEO v27.1.1) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Refactor or Fail \u2014 How We Rebuilt FullContact from the Ground Up | FullContact<\/title>\n<meta name=\"description\" content=\"Today at FullContact we are proud to launch FullContact for iOS. 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