Command-Query separation in Elixir
CQS is a well-known concept from the early age of programming introduced by Bertrand Meyer in the Eiffel language. It says that every action should be either a command (that performs an action) or a query (that returns some data) but not both at the same time. It was devised to draw a clear line between performing mutations and collecting results. Meyer, Bertrand. “Eiffel: a language for software
Réinventons la banque ensemble - Memo Bank
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CQRS Documents by Greg Young
CQRS Documents by Greg Young http://cqrsinfo.com 1 Content A Stereotypical Architecture | ステレオタイプなアーキテクチャ.................................. 3 Application Server | アプリケーションサーバ............................................................ 3 Client Interaction | クライアントの対話 ............................................................... 4 Analysis of the Stereotypical Architecture | ステレオタイプなアーキテクチャの分析 ..
CQRSの和訳
DDDとCQRSについて DDD (Domain Driven Design = ドメイン駆動設計)が世間に知られるようになってきましたが、今度はDDDをさらにスケーラビリティにするCQRS (Command Query Responsibility Segregation = コマンドクエリ責務分離)が出てきました。 DDD提唱者の英語本の和訳版「エリック・エヴァンスのドメイン駆動設計」がAmazonにありますが、非常に分厚く高価です。概要をまとめた資料が「Domain Driven Design（ドメイン駆動設計） Quickly 日本語版 - InfoQ」から入手できます。 CQRSはデータベース設計とイベントソーシングも含めた壮大なWebアプリケーションのアーキテクチャですが、日本語の資料がまだ少ないです。CQRSを適用したアプリケーションを構築できるインフラがWindows Az
GitHub - VaughnVernon/IDDD_Samples: These are the sample Bounded Contexts from the book "Implementing Domain-Driven Design" by Vaughn Vernon: http://vaughnvernon.co/?page_id=168
The iddd_agilepm project uses a key-value store as its underlying persistence mechanism, and in particular is LevelDB. Actually the LevelDB in use is a pure Java implementation: https://github.com/dain/leveldb Currently iddd_agilepm doesn't employ a container of any kind (such as Spring). The iddd_collaboration project uses Event Sourcing and CQRS. It purposely avoids the use of an object-relation
Event Sourcing in Elixir
In this post we will explore how we can use some of Elixir’s more interesting features to implement event sourcing. OTP is the star of this show, enabling us to do some very nice tricks that would be practically impossible with Ruby. OTP stands for Open Telecom Platform, and is Erlang’s answer to the problem of concurrency. OTP relies on immutability of data to provide some very nice abstractions
Building a CQRS/ES web application in Elixir using Phoenix - Binary Consulting
Background I’ve been interested in Command Query Responsibility Segregation and event sourcing since hearing Greg Young talk on the subject in early 2010. During the past seven years I’ve built an open-source Ruby CQRS library (rcqrs); worked professionally on .NET applications following the pattern; and more recently built an Event Store (eventstore) and CQRS library (commanded) in Elixir. Buildi
Command-Query Separation in Ruby
One of the features of Ruby that can cause some confusion is that just about everything is an expression. This means that nearly everything that can return a value, does. This leads to some very interesting and sometimes confusing code. The previous example is contrived because you would typically write it using the ternary operator, but you get my point. Things get even more interesting when it c
Greg Young流CQRS - Mark Nijhof - Digital Romanticism
この記事はMark Nijhof氏のブログ記事「CQRS à la Greg Young」を氏の許可を得て翻訳したものです。（原文公開日：2009/11/11） この記事は以前のブログである"blog.fohjin.com"にて公開していたものです。 以前、2日間の講習を受けた時に、ビールを飲みながらGreg Young氏とドメイン駆動設計について語るという幸運に恵まれたことがあります。その時の話題は専ら、コマンドクエリ責務分離（CQRS:Command and Query Responsibility Segregation）パターンに関するものでした。Gregは、Eric Evans氏が著作において説明したドメイン駆動設計を受け継ぎ、主に技術的な実装を進化させています。コマンドクエリ分離（CQS）は元々Bertrand Meyer氏によって考案されたもので、オブジェクトのレベルで適用さ
副作用を最小限に抑えるために必要なこと - かとじゅんの技術日誌
若干、難しい話ですが、設計力を上げたいプログラマ向けなエントリ。私も道半ばです。一緒に考えていただければ幸いです。 堅牢なアプリケーションを実現する上で「副作用を最小限に抑える」という設計思想は、非常に重要な示唆を含んでいます。 その「副作用」とは、そもそもどんな定義なのでしょうか。 DDDでは"side effect"と定義していて、以下のように解説されています。 Domain-Driven Design: Tackling Complexity in the Heart of Software: Evans, Eric: 8601300201665: Amazon.com: Books エリック・エヴァンスのドメイン駆動設計 作者:Eric Evans翔泳社Amazon P250より引用 In standard English, the term side effect implies
CQRS and REST: the perfect match · Los Techies
CQRS and REST: the perfect match 1 June, 2016. It was a Wednesday. In many of my applications, the UI and API gravitate towards task-oriented UIs. Instead of “editing an invoice”, I “approve an invoice”, with specialized models, behaviors and screens just for accomplishing that task. But what happens when we move from a server-side application to one more distributed, to be accessed via an API? In
bliki: CQRS
CQRS stands for Command Query Responsibility Segregation. It's a pattern that I first heard described by Greg Young. At its heart is the notion that you can use a different model to update information than the model you use to read information. For some situations, this separation can be valuable, but beware that for most systems CQRS adds risky complexity. The mainstream approach people use for i
Command–query separation - Wikipedia
This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "Command–query separation" – news · newspapers · books · scholar · JSTOR (February 2008) (Learn how and when to remove this message) Command-query separation (CQS) is a principle of imperative computer pr
CQRS with Elixir and Phoenix
Wherein I describe how easy it was to implement the CQRS pattern in Elixir. I am currently implementing a REST API for a California startup (it’s all very hush hush). Since I could pick my own tools, I gleefully chose Elixir and the Phoenix Framework. Note: Elixir can be thought of as a Ruby-ish dialect of Erlang, plus really great meta-programming capabilities The REST API I am responsible for is
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(旧版)DDD × CQRS 更新系と参照系で異なるORMを併用して上手くいった話
How To Validate Commands in a CQRS Application | Learn CQRS and Event