The Adaptable TeaStore specification provides a microservice-based case study for implementing self-adaptation through a control loop. We argue that implementations of this specification should be informed by key properties of self-adaptation: system-wide consistency (coordinated adaptations across replicas), planning (executing an adaptation until appropriate conditions are met), and modularity (clean integration of adaptation logic). In this implementation discussion paper, we examine how software architectural methods, the cloud-native Operator pattern, and legacy programming language techniques can decouple self-adaptive control logic from the TeaStore application. We analyze the trade-offs that these different approaches make between fine-grained expressive adaptation and system-wide control, and highlight when reuse of adaptation strategies is most effective. Our analysis suggests that these approaches are not mutually exclusive but can be combined into a multi-tiered architecture for self-adaptive microservices.

翻译：可适应茶店规范为通过控制环实现自适应提供了一个基于微服务的案例研究。我们认为，该规范的实施应遵循自适应的关键特性：系统范围的一致性（跨副本的协调适应）、规划（执行适应直到满足适当条件）以及模块化（适应逻辑的清晰集成）。在这篇实现讨论论文中，我们探讨了软件架构方法、云原生Operator模式以及传统编程语言技术如何将自适应控制逻辑与茶店应用解耦。我们分析了这些不同方法在细粒度表达性适应与系统范围控制之间所做的权衡，并强调了适应策略复用的最佳时机。我们的分析表明，这些方法并非相互排斥，而是可以结合成一个用于自适应微服务的多层架构。