Towards a responsive business, the developer way
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Presentation at DDD Melbourne in July 2013 by Venetia Bird and Nigel Fernandes. The talk focuses on dealing with legacy systems and complexity. They discuss the developer techniques to evolving an architecture thats better able to handle business evolution.
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Towards a responsive business, the developer way
- 1. TOWARDS A RESPONSIVE BUSINESS The Developer Way
- 8. “We make a change in one place and somewhere, something else breaks”
- 9. “It feels like it takes a long time to complete what should be a simple thing”
- 10. “Feels like all we have done are patches, hacks and short term tactical fixes to meet deadlines”
- 12. Part of any problem is: people & process
- 13. We’re going to focus on the technical parts
- 14. www.laputan.org
- 15. 1. Legacy Systems 2. Kitchen Sink Applications 3. Monolithic Applications 4. Complexity We’ll talk about dealing with 4 things: …and what we learnt along the way.
- 19. Legacy systems grow arms and legs… …because the world needs to continue
- 21. Kitchen Sink
- 23. Factoring systems by Value Stream
- 26. You aren’t going to get it right at first go
- 27. Using WebAPI and Areas to build services within a service
- 34. Eliminating batch processes is hard
- 35. 4. Complexity
- 36. “I do believe that complexity is the enemy. Until we better understand complexity, our chances of building better IT systems is limited. The first thing we must understand about complexity is that not all complexity is equal. And the complexity on which most people focus is probably the least complex complexity of all.” http://simplearchitectures.blogspot.com/2009/03/cancer-of-complexity.html Roger Sessions
- 38. Complexity
- 40. Accidental complexity vs Planned complexity
- 43. Make it Visible!
- 44. Drilling down...
- 45. to package our apps
- 46. What’s inside the nuget package? Puppet manifests Environment Configurations as JSON Install Script in Powershell Zip’ed up application
- 47. Proget to manage the packages for the environments Dev Feed Test Feed Staging Feed Production Feed
- 48. Push button deployment 1. Hey Bamboo, deploy v0.1.7 to staging 3. Hey Choclatey, install version 10 4. Proget Staging Feed, give me, v0.1.7 6. Unpacks the box and runs the install script 2. Powershell over winRM 5. Here you go! Staging Server
- 49. Checks for the correct environment Uses the environment configuration with puppet to configure the environment IIS configuration, Folder permissions etc
- 51. What’s interesting!!? Packages shipped with ability configure their environment
- 52. Testing deployment scripts… …with Canary packages
- 53. Guarantees at every every stage in pipeline
- 54. Unit Testing
- 56. Systems
- 59. Status Checks
- 61. 5 Months +scope 9 weeks +scope 4 weeks +scope
- 64. Thank you.
Editor's Notes
- Legacy systems tend to be organic meaning they are used so difficult to not add new features
- Rather than trying to get the right decision now, look for a way to either put off the decision until later (when you'll have more information) or make the decision in such a way that you'll be able to reverse it later on without too much difficulty.
- Typical pipeline and tasks
- Once the compile has completed, and the test have passed we use Nuget to create a package.
- The CI server/Bamboo publishes the packages to Proget.Proget is the tool we used to host our packages for each environment (DEV, TEST, STAGE, PROD)
- Request / trigger to deploy2. Our CI server (Bamboo) runs Powershell script over winrm session to the target machine to tell chocatelycmd to go and install a particular version of the application (package name and version3. A choclatelycmd on the target env (say Development) makes a request to the proget server requesting the version of the application4. Proget responds and the application is downloaded 5. The choclatelycmd unpacks the downloaded packages and runs the install script.
- Checks its on the right target envFinds envconfig, thenUses envconfig with puppet manifest to configure the envThings like iis, folder permission, copies files and whatever else it needs to doHas everything it needs to install itself onto the environment
- The shipped package has everything it needs in order to install itself on the environment. Single application per server.
- Tested the deployment scripts by:Creating a dummy packagingKinda like the canary testing for gas down a mineshaftCreated orchestration project to test our deployment scripts.By creating a dummy package and then using our deployment scripts to get this package through all the environments
- Testing means different things to different people in different contexts:Context of pipeline, in order to get to the next stage of the pipeline, a suite of tests need to be satisfied.For example:After checkout and compilation ran unit and integration tests
- Testing of a single class
- Class would call out to say a repository -> testing the integration worked between those parts of the system. Testing classes interacting with soap end-points.
- TEST tests or black box testing, where we test different parts of the application are working together as they should. (IIS Express for example)After deployed to target env (DEV)Finally UI acceptance tests, which is testing how different applications and systems are interacting to complete user journeys in the Value Stream. Represents direct business value. i.e sponsoring a child
- Timing & costLots of unit tests fast, cheap easy to maintainService integration / black box testsMinimal UI acceptance tests most expensive, slowest and brittle
- So how do we know if all this effort is working.. Are we becoming more responsive..
- Release cadence