Coolblue Behind the Scenes | Pat Hermens - On the shoulders of giants.

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The document discusses the evolution of Coolblue's legacy system called Vanessa over the past 15 years as the company has grown from processing around 1 order per day to over 12,000 orders per day currently. As Vanessa aged it became more difficult to maintain and adapt to new business needs. Coolblue transitioned Vanessa to a microservices architecture using C# and RabbitMQ for messaging to address challenges around agility, reliability, and integrating new systems. Key parts of the new architecture include using RabbitMQ for background jobs, intra-service communication, and sharing data between new and legacy systems through message triggers.

ON THE SHOULDERS OF GIANTS.
Evolving a legacy system using C# micro-services and RabbitMQ
By Pat Hermens

• Pat Hermens
• ~15 years of Microsoft development
• Started with VB6 & MS Access - I know, right?
• Snr. WebAPI Developer at Coolblue for ~1.5 years
ME.

1. Our history
2. Our architecture
3. Our challenges
4. Our solutions (inc. RabbitMQ)
COMING UP.

A (LITTLE) BIT OF HISTORY.
Where has the time gone?

15 YEARS AGO.
Coolblue built a back office system and called her Vanessa

15 YEARS AGO.
Coolblue was getting started:
• 1 pick-up point: Pieter’s house!
• 1 online store: mp3man.nl
• ~1 order a day 
Vanessa just getting started.

10 YEARS AGO.
Coolblue was getting established:
• 1 pick-up point
• 12 online stores
• 350 orders a day 
Vanessa was being rapidly developed to handle the load

10 YEARS AGO.
250 tables 
50 procedures/functions 
150 triggers
200 screens 
50 users

IN 2015.
Coolblue is definitely established:
• 7 physical stores
• 370+ online stores
• 12,000+ orders a day 
… and we’re not done yet!
1300%
3000%
3500%

IN 2015.
1,600+ tables  
3,800+ procedures 7500% 
2,800+ triggers
1,150+ screens  
1,250+ active users 2400%

VANESSA EVOLVED.
Vanessa  
DuPrix
Vanessa  
Fixmeister
Vanessa  
Moneypenny
Vanessa  
Purchandez
Vanessa  
Catalovitz
Vanessa  
Sellswell

VANESSA.
Let’s face it, it’s an older system…
One clear goal:
Provide historical information.

“NEW” VANESSA.
Nice and new! and undefined.
One clear goal:
Deliver information.

Business Restrictions
• Agile
• Reliable
RESTRICTIONS.
Technical restrictions:
() => Testable;
() => Maintainable;

• .NET WPF / UW Applications.
• Continuous Delivery.
• Task-based Workﬂows.
• Event-based truthfulness.
NEW IDEAS.

• Messaging Framework.
• Allows us to shout any type of message…
• ...for any reason.
RABBITMQ.
Let’s bring the information to us when it’s produced
rather than when we need to consume it.

BACKGROUND JOBS.
2. Message goes on RabbitMQ queues.
3. Message is dequeued and processed by any/all interested consumers.
1. Process completion creates a message.
Long-running tasks need to signal when they are complete.

INTRA-SERVICE COMMUNICATION.
2. Messages go on RabbitMQ queues.
3. Messages are dequeued and processed by other services.
1. Meaningful events create messages.
Growing number of services need to talk to each other about “the truth”

ORACLE.
2. Messages go on RabbitMQ queues.
3. Messages are dequeued and processed by consumers.
1. Triggers in Oracle create messages.
Existing Vanessa processes need to share information with new systems

“What should I do?” vs. “What needs to be done?”
TASK-BASED WORKFLOW.
2. Incoming messages are presented as actionable tasks.
3. Tasks are processed by the (happy, event-driven) users.
1. Listeners pick up appropriate messages.

LET’S WRAP THIS UP.
Because you want beer just as much as I do.

• Your text goes here.
VANESSA, EVOLVED.

• RESTful microservices, C# WebApi, background processing jobs? 
 
Let’s have a chat! p.hermens@coolblue.nl  
• Message triggers, queues, routing keys & exchanges are your thing? 
 
Grab hold of Filipe. f.silva@coolblue.nl 
• Want to know more about how we’re getting things done? 
 
Have a chat with any of the Coolblue’ers hanging around tonight...
WANT TO KNOW MORE.

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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

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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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Coolblue Behind the Scenes | Pat Hermens - On the shoulders of giants.

1. ON THE SHOULDERS OF GIANTS. Evolving a legacy system using C# micro-services and RabbitMQ By Pat Hermens

2. • Pat Hermens • ~15 years of Microsoft development • Started with VB6 & MS Access - I know, right? • Snr. WebAPI Developer at Coolblue for ~1.5 years ME.

3. 1. Our history 2. Our architecture 3. Our challenges 4. Our solutions (inc. RabbitMQ) COMING UP.

4. A (LITTLE) BIT OF HISTORY. Where has the time gone?

5. 15 YEARS AGO. Coolblue built a back office system and called her Vanessa

6. 15 YEARS AGO. Coolblue was getting started: • 1 pick-up point: Pieter’s house! • 1 online store: mp3man.nl • ~1 order a day  Vanessa just getting started.

7. • Your text goes here. 15 YEARS AGO.

8. FAST FORWARD.

9. 10 YEARS AGO. Coolblue was getting established: • 1 pick-up point • 12 online stores • 350 orders a day  Vanessa was being rapidly developed to handle the load

10. 10 YEARS AGO. 250 tables  50 procedures/functions  150 triggers 200 screens  50 users

11. FAST FORWARD.

12. IN 2015. Coolblue is definitely established: • 7 physical stores • 370+ online stores • 12,000+ orders a day  … and we’re not done yet! 1300% 3000% 3500%

13. IN 2015. 1,600+ tables   3,800+ procedures 7500%  2,800+ triggers 1,150+ screens   1,250+ active users 2400%

14. • Your text goes here. IN 2015.

15. VANESSA. She’s evolved.

16. VANESSA EVOLVED.

17. VANESSA EVOLVED. Vanessa   DuPrix Vanessa   Fixmeister Vanessa   Moneypenny Vanessa   Purchandez Vanessa   Catalovitz Vanessa   Sellswell

22. CHALLENGES. We all have them!

23. VANESSA. Let’s face it, it’s an older system… One clear goal: Provide historical information.

24. “NEW” VANESSA. Nice and new! and undefined. One clear goal: Deliver information.

25. Business Restrictions • Agile • Reliable RESTRICTIONS. Technical restrictions: () => Testable; () => Maintainable;

26. • .NET WPF / UW Applications. • Continuous Delivery. • Task-based Workﬂows. • Event-based truthfulness. NEW IDEAS.

27. SOLUTIONS. Ta-daaa.

28. • Messaging Framework. • Allows us to shout any type of message… • ...for any reason. RABBITMQ. Let’s bring the information to us when it’s produced rather than when we need to consume it.

29. BACKGROUND JOBS. 2. Message goes on RabbitMQ queues. 3. Message is dequeued and processed by any/all interested consumers. 1. Process completion creates a message. Long-running tasks need to signal when they are complete.

30. DEMO.

31. INTRA-SERVICE COMMUNICATION. 2. Messages go on RabbitMQ queues. 3. Messages are dequeued and processed by other services. 1. Meaningful events create messages. Growing number of services need to talk to each other about “the truth”

32. DEMO.

33. ORACLE. 2. Messages go on RabbitMQ queues. 3. Messages are dequeued and processed by consumers. 1. Triggers in Oracle create messages. Existing Vanessa processes need to share information with new systems

34. DEMO.

35. “What should I do?” vs. “What needs to be done?” TASK-BASED WORKFLOW. 2. Incoming messages are presented as actionable tasks. 3. Tasks are processed by the (happy, event-driven) users. 1. Listeners pick up appropriate messages.

36.

37. LET’S WRAP THIS UP. Because you want beer just as much as I do.

38. • Your text goes here. VANESSA, EVOLVED.

39. • RESTful microservices, C# WebApi, background processing jobs?    Let’s have a chat! p.hermens@coolblue.nl   • Message triggers, queues, routing keys & exchanges are your thing?    Grab hold of Filipe. f.silva@coolblue.nl  • Want to know more about how we’re getting things done?    Have a chat with any of the Coolblue’ers hanging around tonight... WANT TO KNOW MORE.

40. QUESTIONS.

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