Living In Your Own Bubble: From Legacy to Domain Driven Design
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There are a lot of farms in the Netherlands, and a lot of cows. All cows on a farm have a certain value, based on their history. Cows are sold and bought, being born and slaughtered, inseminated or milked, generating a large stream of information. Information which is used by the farmers but also by the government. Taxes, carbon footprints, CO2 reductions, business value, it all needs up-to-date and accurate animal information. Due to new laws, some serious changes had to be implemented on a legacy system. Nightly processing of new information was already problematic, extending the business rules would even make it slower. Scaling and extending the legacy application, which heavily leaned on stored procedures and triggers, appeared to be too difficult. While Domain Driven Design could really help to bring clarity in this complex domain, rebuilding was not an option. Time to introduce the Bubble Context of which Eric Evans wrote in his paper “Getting Started With DDD When Surrounded By Legacy systems”! In this session I will use a simplified version of the legacy system and demonstrate how to create your own bubble context to apply new business rules while keeping the existing system intact. In fact, we hardly touch the existing system! I will explain the advantages and disadvantages of a bubble context and how to move even further away from the legacy system.
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如何办理(hull学位证书)英国赫尔大学毕业证硕士文凭原版一模一样
原版定制【微信:bwp0011】《(hull学位证书)英国赫尔大学毕业证硕士文凭》【微信:bwp0011】成绩单 、雅思、外壳、留信学历认证永久存档查询，采用学校原版纸张、特殊工艺完全按照原版一比一制作（包括：隐形水印，阴影底纹，钢印LOGO烫金烫银，LOGO烫金烫银复合重叠，文字图案浮雕，激光镭射，紫外荧光，温感，复印防伪）行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备，十五年致力于帮助留学生解决难题，业务范围有加拿大、英国、澳洲、韩国、美国、新加坡，新西兰等学历材料，包您满意。
【业务选择办理准则】
一、工作未确定，回国需先给父母、亲戚朋友看下文凭的情况，办理一份就读学校的毕业证【微信bwp0011】文凭即可
二、回国进私企、外企、自己做生意的情况，这些单位是不查询毕业证真伪的，而且国内没有渠道去查询国外文凭的真假，也不需要提供真实教育部认证。鉴于此，办理一份毕业证【微信bwp0011】即可
三、进国企，银行，事业单位，考公务员等等，这些单位是必需要提供真实教育部认证的，办理教育部认证所需资料众多且烦琐，所有材料您都必须提供原件，我们凭借丰富的经验，快捷的绿色通道帮您快速整合材料，让您少走弯路。
留信网认证的作用:
1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分
8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
【关于价格问题（保证一手价格）】
我们所定的价格是非常合理的，而且我们现在做得单子大多数都是代理和回头客户介绍的所以一般现在有新的单子 我给客户的都是第一手的代理价格，因为我想坦诚对待大家 不想跟大家在价格方面浪费时间
对于老客户或者被老客户介绍过来的朋友，我们都会适当给一些优惠。
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原版一模一样【微信：741003700 】【(sdsu毕业证书)圣地亚哥州立大学毕业证成绩单】【微信：741003700 】学位证，留信认证（真实可查，永久存档）原件一模一样纸张工艺/offer、雅思、外壳等材料/诚信可靠,可直接看成品样本，帮您解决无法毕业带来的各种难题！外壳，原版制作，诚信可靠，可直接看成品样本。行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备。十五年致力于帮助留学生解决难题，包您满意。
本公司拥有海外各大学样板无数，能完美还原。
1:1完美还原海外各大学毕业材料上的工艺：水印，阴影底纹，钢印LOGO烫金烫银，LOGO烫金烫银复合重叠。文字图案浮雕、激光镭射、紫外荧光、温感、复印防伪等防伪工艺。材料咨询办理、认证咨询办理请加学历顾问Q/微741003700
【主营项目】
一.毕业证【q微741003700】成绩单、使馆认证、教育部认证、雅思托福成绩单、学生卡等！
二.真实使馆公证(即留学回国人员证明,不成功不收费)
三.真实教育部学历学位认证（教育部存档！教育部留服网站永久可查）
四.办理各国各大学文凭(一对一专业服务,可全程监控跟踪进度)
如果您处于以下几种情况：
◇在校期间，因各种原因未能顺利毕业……拿不到官方毕业证【q/微741003700】
◇面对父母的压力，希望尽快拿到；
◇不清楚认证流程以及材料该如何准备；
◇回国时间很长，忘记办理；
◇回国马上就要找工作，办给用人单位看；
◇企事业单位必须要求办理的
◇需要报考公务员、购买免税车、落转户口
◇申请留学生创业基金
留信网认证的作用:
1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分
8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
办理(sdsu毕业证书)圣地亚哥州立大学毕业证【微信：741003700 】外观非常简单，由纸质材料制成，上面印有校徽、校名、毕业生姓名、专业等信息。
办理(sdsu毕业证书)圣地亚哥州立大学毕业证【微信：741003700 】格式相对统一，各专业都有相应的模板。通常包括以下部分：
校徽：象征着学校的荣誉和传承。
校名:学校英文全称
授予学位：本部分将注明获得的具体学位名称。
毕业生姓名：这是最重要的信息之一，标志着该证书是由特定人员获得的。
颁发日期：这是毕业正式生效的时间，也代表着毕业生学业的结束。
其他信息：根据不同的专业和学位，可能会有一些特定的信息或章节。
办理(sdsu毕业证书)圣地亚哥州立大学毕业证【微信：741003700 】价值很高，需要妥善保管。一般来说，应放置在安全、干燥、防潮的地方，避免长时间暴露在阳光下。如需使用，最好使用复印件而不是原件，以免丢失。
综上所述，办理(sdsu毕业证书)圣地亚哥州立大学毕业证【微信：741003700 】是证明身份和学历的高价值文件。外观简单庄重，格式统一，包括重要的个人信息和发布日期。对持有人来说，妥善保管是非常重要的。
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TMU毕业证书精仿办理
多伦多都会大学毕业证成绩单(留信网认证)【176555708微信】不能毕业办理假文凭回国找工作
【多伦多都会大学毕业证成绩单仿制】（176555708微信☀️）伪造研究生学位证书TMU毕业证文凭,多伦多都会大学文凭证书学籍信息入库,多伦多都会大学学位证书留学高校学位证书补办
【TMU毕业证【微信176555708】多伦多都会大学文凭学历】【微信176555708】【多伦多都会大学文凭学历证书】【多伦多都会大学毕业证书与成绩单样本图片】毕业证书补办 Fake Degree做学费单【毕业证明信-推荐信】成绩单，录取通知书，Offer，在读证明，雅思托福成绩单，真实大使馆教育部认证，回国人员证明，留信网认证。网上存档永久可查！
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Living In Your Own Bubble: From Legacy to Domain Driven Design
- 1. LIVING IN YOUR OWN BUBBLE FROM LEGACY TO DOMAIN DRIVEN DESIGN Jacob Duijzer - DDD Foundations - June 7, 2023
- 2. ABOUT ME Jacob Duijzer, Vught, the Netherlands. Helping developers, teams & organizations build better software. Agile Coach | Enabling Team Lead | Consultant | Speaker @ Follow me: Team Rockstars IT https://linkedin.com/in/jacobduijzer
- 3. FARMS, COWS & PHOSPHATE RIGHTS
- 14. ANIMAL CATEGORY DETERMINATION (EXISTING FEATURE)
- 15. PROBLEMS
- 16. SPECIFICATIONS
- 17. ANIMAL EVENTS
- 18. THE LEGACY CODE Database trigger Database functions Specifications
- 19. THE BUBBLE CONTEXT TO THE RESCUE
- 20. THE BUBBLE CONTEXT A 'bubble' is a small bounded context established using an Anticorruption Layer (ACL) for the purpose of a particular development effort and not intended necessarily to be expanded or used for a long time. Eric Evans - Getting Started With DDD When Surrounded by Legacy Systems
- 23. THE ANIMAL BUBBLE CONTEXT Replacing existing software (database functions, triggers) Using the Strangler Fig pattern Introducing a queue Enabling fast, on-demand, per animal processing
- 24. LIVING IN THE BUBBLE Disclaimer: this is not a real application, just a less complex recreation!
- 25. GOALS What does the Anti Corruption Layer look like? The data flow inside the bubble Handling the different events Implementing the last event handler, the Departure * Arrival event
- 26. KEY TAKEAWAYS AND FUTURE DIRECTIONS
- 27. FUTURE DIRECTIONS Autonomous Bubble Context Exposing Legacy Assets as Services Expanding a Bubble
- 28. KEY TAKEAWAYS Working with legacy code can be very cool! The Bubble Context can give your applications a second life (or at least extend its life) Using different bubbles can help autonomous teams, create value stream teams (Team Topologies) Using a ubiquitous language is really important (even when that means using Dutch in your source code!) Specifications by Example, reusable, automated, "business readable" specifications is very powerful
- 29. QUESTIONS?
- 31. SOURCES Images from Unsplash: Getting Started with DDD When Surrounded By Legacy Systems - Eric Evans Living In Your Own Bubble - GitHub Repository Anoek Folkertsma Jo-Anne McArthur Ryan Song Rajesh Ram Lomig William Isted Rubén Bagüés