Tuscany JAVA SCA Runtime

M2

Service Component Architecture (SCA)

� Servce oriented component model for describing service assemblies

� Technology independent modeling and composition of service networks

� Unified, language-independent way to expose implementations as services (Java, C++, PHP, Ruby, Javascript, BPEL, XSLT, others)

� Binding model for multiple access methods and infrastructure service

� Is not about implementing API’s

� Service components with service interfaces

SCA Specs

� SCA Assembly Model V0.96

� SCA Client and Implementation Model for Java (V0.95) � SCA Client & Implementation for BPEL (V0.95) � SCA Client & Implementation for Spring (V0.95) � SCA Client & Implementation for C++ (V0.95)

� SCA Web Service bindings � SCA JMS Binding � SCA EIS/JCA Bindings � SCA Stateless Session Bean Binding

� SCA Policy Framework

Description Files within an SCA Assembly

� No deployment package specified� ComponentType description could be a side file, annotated code or other

.scdl.componentType

Annotated code

Assembly description

Component Type description

@Service(HelloService.class)public class public class public class public class HelloServiceImpl implements implements implements implements HelloService {public public public public String hello(String message) {

...}

<?xml version="1.0" encoding="ASCII"?><composite xmlns=http://www.osoa.org/xmlns/sca/1.0xmlns:foo=http://foo.com name="AccountServices">

<service name="AccountService"><interface.java interface="foo.AccountService"/><reference>AccountServiceComponent</reference>

</service><property name="complexFoo" type="foo:MyComplexType">

<foo:a>AValue</foo:a><foo:b>InterestingURI</foo:b>

</property><component name="AccountServiceComponent">

<implementation.java class="foo.AccountServiceImpl"/><property name="currency" source="$complexFoo/a"/><reference

name="accountDataService">AccountDataServiceComponent</reference><reference name="stockQuoteService">StockQuoteService</reference>

</component><component name="AccountDataServiceComponent">

<implementation.composite name="AccountDataServiceComposite"/></component><reference name="StockQuoteService">

<interface.java interface=“stock .StockQuoteService"/></reference>

</composite>

<componentType xmlns="http://www.osoa.org/xmlns/sca/0.9"><service name="HelloService"><interfaceinterfaceinterfaceinterface.java interfaceinterfaceinterfaceinterface="services.hello.HelloService"/></service>

...</componentType>

SCA Assembly

referenceservice

composite

wire wire wire

Binding

Web Service

SCA

JCA

JMS

…

Interface

Java Interface

WSDL PortType

…

… ……

component component

Binding

Web Service

SCA

JCA

JMS

…

Interface

Java Interface

WSDL PortType

…

property setting

properties

Implementation

Java, PHP

C++, Ruby,

Javascript,

BPEL, XSLT,

Composite,

…

componentType

Bootstrap process

host

host-api

Launcher

DeployerBootsptrapper

RuntimeComponent

SCA API

.scdl + .componentType(s) + business logic (services)

SCA Assemblies

System Application

BootBootBootBoot---->>>>DeployDeployDeployDeploy---->>>>

� Bootstrap process is controlled by Host environment

� Runtime is itself an SCA Assebmbly (“System”)

Deployment

Component

DefinitionComponent

Definition

component

load

buildconnect

component

component

run

deploy

assemblies

repository

composite

SCDL

� Deployment initiates evaluation of an assembly and wiring� Deploy composites or single artifacts (component, service or reference)

Loading Process

SCA assembly package

Represented byAn Object Model

referenceservice

composite

wire wire wire

component component

property setting

properties

in-memory Configuration Model

Loaders (keyed by QName)

spi.modelspi.modelspi.modelspi.modelSCA assembly model

LoaderRegistry

composite description (.scdl)+ assets

scdl

STAX/Instrospectioncreate

Building Process

Builders

BuilderRegistry

Set points for dependency injection(properties, references, services, constructor)

Implementation of the components with a set of stubs that need to be

connected to other components

in-memory Configuration Model

WiringInvocation chains

(one per operation)InboundWire OutboundWire

WireInvocationHandler

Invocation

TargetInvokerassociated with the operation

Payload

interceptors

DataBindingInterceptor

WebService Binding

ServletContainer

WebappRuntime

JDK

StandaloneRuntime

WebServiceBindingWebServiceBindingLoader

wsdl (url)

Axis2BindingBuilder

Axis2Service

ServiceClient

Axis2ServiceServlet

Axis2TargetInvokerAxiomDataBinding

load

Axis2Reference

buildbuild

<binding.ws…

Backup Info

Partial spi. model Class Diagram

Loaders

� Core� ComponentLoader, ComponentTypeElementLoader, PropertyLoader,

ReferenceLoader, ServiceLoader, InterfaceJavaLoader, DataTypeLoader, ImplementationCompositeLoader, DependencyLoader, CompositeLoader

� System: SystemBindingLoader, SystemImplementationLoader, SystemComponentTypeLoader, SystemCompositeComponentTypeLoader

� Java: InterfaceJavaLoader, JavaComponentTypeLoader, JavaImplementationLoader

� Extensions� Binding: WebServiceBindingLoader, RMIBindingLoader

OSGiBindingLoader, JSONRPCBindingLoader� Implementation: JavaScriptImplementationLoader,

RubyImplementationLoader, SpringImplementationLoader� ComponentType: JavaScriptComponentTypeLoader,

RubyComponentTypeLoader� IDL: InterfaceWSDLLoader

Some Builders

� Core

� CompositeBuilder, CompositeBindlessBuilder

� System: SystemBindingBuilder, SystemComponentBuilderSystemCompositeBuilder

� Java: JavaComponentBuilder

� Extensions

� Binding: Axis2BindingBuilder, RMIBindingBuilder, ExternalJbiServiceBuilder

� Implementation: JavaScriptComponentBuilder, RubyComponentBuilder, SpringCompositeBuilder