CQRS
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The document discusses the Command Query Responsibility Segregation (CQRS) pattern and related concepts like event sourcing. It explains that CQRS separates read and write operations into different models to allow for simpler and more optimized models. Event sourcing is also covered, which stores an entire history of events rather than just the current state. Benefits include flexibility, scalability, and a complete audit log, but consistency must be managed. CQRS is best for complex domains and should not be applied to entire simple applications.
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香港六合彩
想与香港六合彩碰上目光的法码肯定重一点点。这一点点可不是普通的一点点，如果请物理老师把它换算成电流，一定是几万焦耳的差别。正因为一点点，香港六合彩目光碰撞的概率才特别大。这种双方都没有经历过的正负电碰撞现象在香港六合彩一次又一次的失之交臂后终于不可避免地发生正面碰撞。这是怎样的情形，这种初次展露出来的奇异目光可谓稀奇又味怪，用诗来说，就是既有小荷才露尖尖角的羞怯，又有大珠小珠落玉盘的激情，既有柳絮飞来一片红的浪漫，也有力拔山兮气盖世的执着。如此碰撞的目光，形容它们像强磁场中的两块吸铁石，一点都不过分。一秒、两秒、三秒……香港六合彩的目光还拔不开。子允第一秒钟就想逃的，香港六合彩需要扭着脖子，这样比周晨晨招眼得多。可香港六合彩身不由己，心也不由己，人家女孩子都没胆怯，自己先逃有什么劲，于是定下神坚定不移。现在子允的脸好像已红出习惯，目光交汇的瞬间就烫上了。香港六合彩本以为周晨晨先散神，可香港六合彩今天好像变了一个人，辣油似的目光比自己还要坚定不移。子允慌了，再下去就要被对方强电流的目光击穿了，说不定真的就要焦耳了。一旁的张腾像受到这股强大磁场的感应，一个大喷嚏把触电的子允从危急中震回来。懵了的子允把看直的目光对着张腾，张腾以为瞪自己，莫名其妙，也来了莫名其妙的情绪，瞪着眯眯眼和子允较劲，瞪我干吗？子允捶捶头，又捶了一下，想不到香港六合彩来这套，我一见到长相幽默的人就会忍不住瞪大眼睛看几眼，坐一起这么久，你不知道我这毛病啊。口气是往讨好里说的，心中却埋怨张腾坏了好事，再看周晨晨，香港六合彩已埋下头，葱白的双手在漆黑的发梢上慌乱地拢着。子允像从美梦中惊醒，再也回不到梦里。香港六合彩追寻着，无奈着，越想越气，拳头都掐紧了。可张腾不省事，看着败下阵的子允以为自己胜了一筹，别乱拍马屁，我不是高老师，不吃这一套！子允恼了，想说你找软柿子捏啊，可这样说太敏感，张腾也许会终止借作业本给人抄，改口道，你小子早上吃错药啦？子允侧过身子正视香港六合彩，说正视其实跟瞪也差不多。我最不喜欢把时间花在无意义的事上，更讨厌别人莫名其妙瞪我！你才莫名其妙，你早上吃的火药吧？子允不知道自己在瞪张腾，更不知道张腾对自己说无意义什么意思，不对，香港六合彩也许指自己把时间花在无意义的事上才抄作业的吧？子允不自在，如果张腾存在拿捏自己的情绪，就肯定存在泄漏危险。香港六合彩可以不在乎同学怎么看，因为抄作业在一般人的眼中算不得什么错，而放在周晨晨眼中就不一样了，香港六合彩会瞧不起自己，香港六合彩会……子允决定压压香港六合彩，哪能受香港六合彩控制。子允和张腾斗嘴已有历史，从没输过，香港六合彩看着张腾道，我这人做过的最无意义的事情就是花工夫观察你。
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Mobile learning involves using mobile technologies like phones and PDAs to enhance the learning experience anywhere and anytime. These devices are more affordable alternatives to desktop computers for accessing the internet and educational materials. Some advantages of mobile learning include 24/7 access to content, ease of carrying notes and materials, and engaging digital native learners. However, small screens limit displayed content and storage capacity, and batteries need regular charging. PDAs are handheld computers that allow storing contacts, internet access, note-taking, and organization, helping students stay connected at a lower cost than laptops. Mobile learning is poised to transform education by taking classes beyond physical walls through wireless connectivity.
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香港六合彩
香港六合彩在床上坐也不是，躺也不是，猛然想起不能重蹈覆辙，于是掏出作业本。偏不巧，掏出的第一本就是物理，香港六合彩厌恶地骂了一句，又觉得这难啃的物理题比起跟父母摊牌到学校的事简单得多。外面玻璃板的桌子上传来摆碗的声音，然后传来母亲的敲门声。子允应着，屁股却胶在椅子上直到母亲再次来催。见桌上台灯亮着，母亲心疼地埋怨学校布置的作业太多。子允想就着这话说昨天的作业更多，结果才……但香港六合彩没说，现在说会影响父母的食欲。饭桌上，菜色很丰富，赶上平时子允定狼吞虎咽。香港六合彩望着透明玻璃桌面下自己一双虎头棉拖发呆，思忖着如何把请家长的事情说得委婉些，把父母的难过程度降到最低。香港六合彩希望自己是个日本人，可以厚颜无耻地把侵略说成是解放苦难的中国人民，可以理直气壮地把靖国神社里的战争罪犯当作英雄供奉，还可以委屈地对中国人说，香港六合彩为香港六合彩牺牲了那么多将士，香港六合彩不但不像香港六合彩一样虔诚地敬奉还一再干涉香港六合彩的内政……《Y滋味》有滋又有味子允胡思乱想着，只觉得今天的饭一点味道也没有，好像都是日本人的唾沫星，并从电影中得出结论，那些哄小孩上当的日本鬼子个个长着眯眯眼。妈妈见儿子不像平时生猛，一个劲给香港六合彩搛菜。子允更觉羞愧，看着妈妈一如往常地为自己忙乎，充分理解了只有失去才知道珍惜的含义。现在把话说出口，这样和睦的气氛短期内肯定回不来。想着，子允鼻子酸起来，快要掉下的泪珠被妈妈挟来的菜挡了回去，但谢谢之声有滋又有味。父亲的印象中，子允今天的表现是进入青春叛逆期后难得一见的好，心情也跟着一片大好，对儿子和蔼许多不说，还头一回招呼子允多吃菜，并亲自去看灶台上的汤怎么样了。这更要子允的命，悲情的事件往往都伴随着极为反差的气氛。眼圈红润的子允开始打掩护，直怨妈妈辣椒放多了。妈妈听后忙端水给香港六合彩。有了水的后援，泪水开始在眼眶里肆无忌惮地酝酿，香港六合彩控制不住
Chritmas
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Patterns and Practices for Event Design With Adam Bellemare | Current 2022
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Events are the fundamental component of every streaming architecture, and how you implement them will hugely impact your event-driven architectures. Despite the wide range of materials on event-driven architectures and the importance of event modeling, this critical domain is often left as an exercise for you to implement on your own. Improperly modeling your events can have difficult and costly impacts on not only your event consumers but on the teams and systems that produce them as well.
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CQRS
- 3. “A bad design with “ a test suite is still a bad design Rich Hickey
- 6. patterns
- 7. vocabulary
- 9. hardest of being a dev ?
- 11. value
- 13. identity
- 15. state
- 17. identity ≠ state
- 19. CQRS
- 20. command
- 21. command query
- 25. command ≠ query
- 26. vs. crud
- 29. command (write) side tighter domain objects
- 31. CQRS benefits
- 32. CAP CA vs AP
- 33. event sourcing
- 34. event sourcing is not CQRS
- 36. state = snapshot in time = sum of events !
- 37. event sourcing
- 39. DDD
- 40. Add A to cart Add B to cart Remove B from cart Add C to cart Capture order address
- 42. Add A to cart A Add B to cart Remove B from cart Add C to cart Capture order address
- 43. Add A to cart Add B to cart A B Remove B from cart Add C to cart Capture order address
- 44. Add A to cart Add B to cart Remove B from cart A Add C to cart Capture order address
- 45. Add A to cart Add B to cart Remove B from cart Add C to cart A C Capture order address
- 46. Add A to cart Add B to cart Remove B from cart Add C to cart Capture order address A C
- 48. project data items removed at checkout
- 49. project data added then removed often
- 50. project data age of cart items
- 59. testing commands play event log
- 60. testing commands can never be in an invalid state
- 61. testing commands expectations in terms of events
- 62. given a list of events when I run a command expect an event
- 64. eventual consistency must be dealt with
- 65. benefits
- 66. benefits of a complete history
- 67. benefits of a complete history of everything
- 68. benefits of a complete history of everything ever
- 70. don’t use it for cruddy apps simple stuff your entire app
- 72. do consider it where it fits
- 73. “ “ Seek simplicity, and distrust it. Alfred North Whitehead