Micro services as architectural concept

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Previous applications architectures

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“Spaghetti”

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Function 2 Function 3 Function ... Application Function 5 Function 4 Function 1

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Objekt oriented

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Object 1 - Data - Methods Object 1 - Data - Methods Object ... - Data - Methods Application

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Layer model

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Layer 1.3 Layer 1.2 Layer 1.1 Layer 2.2 Layer 2.1 Application

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Similarity: Deployment monoliths

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Micro services

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Single, independent applications

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Layer 2.2 Layer 2.1 Layer 1.3 Layer 1.2 Layer 1.1 Application 1 Application 2

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Requirement: Domain driven design

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Layer 1.3 Layer 1.2 Layer 1.1 Layer 2.2 Layer 2.1 Layer 3.4 Layer 3.4 Layer 3.1 Layer 3.2 Domain 1 Domain 3 Domain 3

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Micro services in “real life”

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Domäne 3 Domain 1 Domain 2 Domain 5 Domain 4 Domain 3 Bounded contexts

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Interfaces and data exchange

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Domain 1 Domain 5 Format? Versioning? Compatibility? Fault tolerance? Number of calls? Common data model?

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Shared kernel

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Domain 1 Data model Domain 3

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Best case ● Work independently from each other ● Extendable by different teams ● Exchangeable ● Scalable

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Worst case ● Erros are even harder to find ● Increased total complexity ● Performance suffers ● Cascading outages

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Aimeos

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E-Commerce components for integration into applications

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Layer model

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Config Data access JQAdm JQuery Frontend client List ... Basket Admin controller Frontend controller PHP I18n Config Database View Logger Session Bandend application Frontend application ExtAdm JsonAdm ExtJS JSON API

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Data domains

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Product Catalog Index Order ... 16 Datendomänen Data access

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Separation into stacks for micro services

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Config List Client ... Client Cntl ... Cntl Product ... Order ... Basket By domain

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Frontend client List ... Basket Frontend controller Data access By use case Config JQuery JQAdm ExtAdm JsonAdm Cntl Cntl Cntl Data Data Data ExtJS JSON API

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Frontend client List ... Basket Frontend controller Data access With shared kernel JQuery JQAdm ExtAdm JsonAdm Admin Controller ExtJS JSON API

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As Composer packages ● Aimeos core (shared kernel) ● HTML client (frontend) ● JQAdm (JQuery admin) ● ExtAdm (ExtJS admin) ● JsonAdm (JSON admin API) ● Jobs (cronjob controller)