Engineering Scalable, Elastic, and Cost-Efficient Cloud Computing Applications: The CloudScale Method

This book provides an overview of the problems involved in engineering scalable, elastic, and cost-efficient cloud computing services and describes the CloudScale method ― a description of rescuing tools and the required steps to exploit these tools. It allows readers to analyze the scalability problem in detail and identify scalability anti-patterns and bottlenecks within an application. With the CloudScale method, software architects can analyze both existing and planned IT services.

The method allows readers to answer questions like:

• With an increasing number of users, can my service still deliver acceptable quality of service?
• What if each user uses the service more intensively? Can my service still handle it with acceptable quality of service?
• What if the number of users suddenly increases? Will my service still be able to handle it?
• Will my service be cost-efficient?

First the book addresses the importance of scalability, elasticity, and cost-efficiency as vital quality-related attributes of modern cloud computing applications. Following a brief overview of CloudScale, cloud computing applications are then introduced in detail and the aspects that need to be captured in models of such applications are discussed. In CloudScale, these aspects are captured in instances of the ScaleDL modeling language. Subsequently, the book describes the forward engineering part of CloudScale, which is applicable when developing a new service. It also outlines the reverse and reengineering parts of CloudScale, which come into play when an existing (legacy) service is modified. Lastly, the book directly focuses on the needs of both business-oriented and technical managers by providing guidance on all steps of implementing CloudScale as well as making decisions during that implementation. The demonstrators and reference projects described serve as a valuable starting point for learning from experience.

This book is meant for all stakeholders interested in delivering scalable, elastic, and cost-efficient cloud computing applications: managers, product owners, software architects and developers alike. With this book, they can both see the overall picture as well as dive into issues of particular interest.

本書提供了工程可擴展、彈性和成本效益的雲計算服務所涉及的問題概述，並描述了CloudScale方法 - 一種救援工具的描述和利用這些工具所需的步驟。它使讀者能夠詳細分析可擴展性問題，並在應用程序中識別可擴展性反模式和瓶頸。使用CloudScale方法，軟件架構師可以分析現有和計劃中的IT服務。

該方法使讀者能夠回答以下問題：

• 隨著使用者數量的增加，我的服務是否仍能提供可接受的服務質量？
• 如果每個使用者更加密集地使用服務，我的服務是否仍能處理並提供可接受的服務質量？
• 如果使用者數量突然增加，我的服務是否仍能處理？
• 我的服務是否具有成本效益？

首先，本書介紹了可擴展性、彈性和成本效益作為現代雲計算應用程序的重要品質屬性的重要性。在簡要介紹CloudScale之後，詳細介紹了雲計算應用程序，並討論了需要在這些應用程序模型中捕獲的方面。在CloudScale中，這些方面被捕獲在ScaleDL建模語言的實例中。隨後，本書描述了CloudScale的前向工程部分，適用於開發新服務時。它還概述了CloudScale的反向和重新工程部分，這在修改現有（遺留）服務時發揮作用。最後，本書直接關注商業導向和技術管理人員的需求，提供了在實施CloudScale的所有步驟中提供指導以及在實施過程中做出決策的指南。所描述的演示和參考項目作為從經驗中學習的寶貴起點。

本書適用於所有對交付可擴展、彈性和成本效益的雲計算應用程序感興趣的利益相關者：管理人員、產品負責人、軟件架構師和開發人員。通過本書，他們既可以看到整體圖景，也可以深入研究特定感興趣的問題。