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Tuscany 架构与应用加载机制

Tuscany 架构与应用加载机制. 目录. 概述 Tuscany 内核加载 示例 Tuscany 应用加载. 概述. Extension Point Registry(EPR). Tuscany 以 E xtension 的方式扩展它的功能 Extension Point 是内核与 Extension 之间的桥梁. Extension Point Registry(EPR). 以 ContributionScanner 为例. FolderContributionScanner. JarContributionScanner.

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Tuscany 架构与应用加载机制

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  1. Tuscany架构与应用加载机制

  2. 目录 • 概述 • Tuscany内核加载 • 示例 • Tuscany应用加载

  3. 概述

  4. Extension Point Registry(EPR) • Tuscany以Extension的方式扩展它的功能 • Extension Point是内核与Extension之间的桥梁

  5. Extension Point Registry(EPR) • 以ContributionScanner为例 FolderContributionScanner JarContributionScanner ZipContributionScanner

  6. Extension Point Registry(EPR) • 实现ContributionScanner接口的类用于扫描特定的打包格式并构建一个artifacts列表 • 如JarContributionScanner则用于读取解析Jar contribution • 每个ContributionScanner接口实现均通过ContributionScannerExtensionPoint向Tuscany运行时注册

  7. Extension Point Registry(EPR) • 内核查找Extension Point Registry，获取Extension Point //创建EPR ExtensionPointRegistryregistry = new Default ExtensionPointRegistry (); //查找 ContributionScannerExtensionPointfactories = registry.getExtensionPoint(ContributionScannerExtensionPoint.class);

  8. 内核加载 • 内核加载流程

  9. Create Extension Point Registry • 实例化Extension Point Registry //实例化EPR ExtensionPointRegistryregistry = new Default ExtensionPointRegistry();

  10. Create Extension Point Registry • 创建必需的Extension Point • UtilityExtensionPoint • ModelFactoryExtensionPoint • ProxyFactoryExtensionPoint //查找UtilityExtensionPoint，若不存在则创建之 UtilityExtensionPoint utilities = registry.getExtensionPoint(UtilityExtensionPoint.class);

  11. Discover Module Activators • 读取“META-INF/services/”目录下与ModuleActivator相关的属性文件 • 部分内容

  12. Discover Module Activators • 上述类均实现了ModuleActivator接口

  13. Start Module Activators • 对上一阶段发现的各个Module Activator，分别调用start()方法，启动相关服务 • e.g., CorbaRuntimeModuleActivator • 向EPR注册CorbaHostExtensionPoint • 启动Corba服务器

  14. Create Contribution Service • 创建ContributionServiceImpl对象并注册EPR

  15. Create Scope Registry • 定义的几种Scope • Stateless • Request • Session • Conversation • Composite • System • Undefined

  16. Create Composite Builder • CompositeBuilder接口 • 此阶段实例化一些该接口的实现类

  17. Create Composite Builder • CompositeBuilder接口的实现类

  18. Create Composite Activator • 实例化CompositeActivatorImpl

  19. Load System SCA Definitions

  20. 示例 • 在线水果商店

  21. Load Contributions • 找到contributions的路径并加载它们

  22. Resolve Composite • 将composite文件（XML格式）中的元素解析出来 • <include> • <component> • <service>

  23. Build Composite • 执行相关的CompositeBuilder的build()方法

  24. Build Composite • 若binding的方式是WSDL，当对ComponentServiceBindingBuilderImpl执行其build()方法时，则生成WSDL文档

  25. Activate Composite • 对composite中定义的每一个构件，为其增加implementation provider、service binding provider、reference binding provider

  26. Activate Composite • HelloWorld示例中 • store构件的实现方式是widget，那么需要为其增加一个WidgetImplementationProvider • shoppingcart构件的实现方式是Java，则需要为其增加JavaImplementationProvider • store构件的binding是HTTP协议，需要为其增加一个HTTPBindingProvider

  27. Start Composite • 调用上一阶段的provider的start()方法 • 具体来看，完成.composite文件定义的binding，启动相关的implementation provider等

  28. Start Composite • HelloWorld示例中 • Store构件启动WidgetImplementationProvider • shoppingcart构件JavaImplementationProvider • store构件的HTTP binding • Catalog构件的Jsonrpc binding

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