Tuscany Runtime Architecture

Contents

• Overview• An example• Bootstrap kernel• Process of composite application

Overview

Extensions：1.Component implementation: BPEL, java etc.2.Binding: SOAP/HTTP web services, JSON-RPC , and RMI. 3.Interface Type: Java interfaces and WSDL4.Databinding: SDO, JAXB , and AXIOM

Extension Point Registry(EPR)

• Extension: achieving extensibility• Extension Point is the bridge between Tuscany

kernel and extensions

Extension Point Registry(EPR)

• e.g., ContributionScanner

FolderContributionScanner

JarContributionScanner

ZipContributionScanner

Extension Point Registry(EPR)

• Objects implemented ContributionScanner interface scan specific package and then build an artifact list– e.g., JarContributionScanner for resolving Jar

contributions• Each ContributionScanner object registers

itself with Tuscany runtime via ContributionScannerExtensionPoint

Extension Point Registry(EPR)

• Extension Point Registry(EPR) holds a list of all the extension points

• EPR is used to look up extension point

//create EPRExtensionPointRegistry registry = new Default ExtensionPointRegistry ();

//look upContributionScannerExtensionPoint factories = registry.getExtensionPoint(ContributionScannerExtensionPoint .class);

An example

• An online fruit store

Bootstrap kernel

• Bootstrap sequence

Create Extension Point Registry

• Instantiate ExtensionPointRegistry

//Instantiate EPRExtensionPointRegistry registry = new Default ExtensionPointRegistry ();

Create Extension Point Registry

• Create necessary Extension Point– UtilityExtensionPoint– ModelFactoryExtensionPoint– ProxyFactoryExtensionPoint

//look up UtilityExtensionPointUtilityExtensionPoint utilities = registry.getExtensionPoint(UtilityExtensionPoint.class);

Discover Module Activators

• Load ModuleActivator related configuration files in “/META-INF/services/”

Discover Module Activators

• Previous classes implemented ModuleActivator

Start Module Activators

• Call ModuleActivator.start() to start services• e.g., CorbaRuntimeModuleActivator– Register CorbaHostExtensionPoint– Start Corba server

Create Contribution Service

• Instantiate ContributionServiceImpl

Create Scope Registry

• Scope– Stateless: create a new component instance on

each call– Conversation: create a component instance for

each conversation– Composite: create a single component instance for

all calls

Create Composite Builder

• CompositeBuilder

• Create implementation classes that implemented CompositeBuilder

Create Composite Builder

• CompositeBuilder Impl

Create Composite Activator

• Create CompositeActivatorImpl

Load System SCA Definitions

• Load system definitions– ReliabilityPolicy– TransactionPolicy– SecurityPolicy– LoggingPolicy– WSBindingDefinitions– SCABindingDefinitions– JMSBindingDefinitions

Load Contributions

• Find and load contributions– e.g., Jar, Zip

Resolve composite

• Resolve elements in .composite file– <include>– <component>– <service>

Build Composite

• Execute CompositeBuilder.build()

Build Composite

• E.g., binding type is WSDL, ComponentServiceBindingBuilderImpl.build() will generate WSDL file

Activate Composite

• For each component defined in composite, adding related implementation provider, service binding provider, reference binding provider

Activate Composite

• In Online fruit store, – Store component’s implementation type is

widget， a WidgetImplementationProvider is needed

– shoppingcart component’s implementation type is Java， a JavaImplementationProvider is needed

– store component’s binding type is HTTP, a HTTPBindingProvider is needed

Start Composite

• Start binding, implementation and associated policies, etc.

Start Composite

• In Online fruit store, – Store component:• WidgetImplementationProvider• HTTP binding

– shoppingcart component• JavaImplementationProvider

– Catalog component• Jsonrpc binding