Today's cloud environments pose new challenges for application developers: hiding cloud infrastructure from business logic, assembling components on heterogeneous and distributed cloud environments, and optimizing the provisioning of the required cloud resources. This session will demonstrate how to use Apache Tuscany and the Service Component Architecture (SCA) to develop, build, and run an application composed of several service components in a distributed cloud environment. We'll illustrate how to encapsulate cloud infrastructure services as SCA components to simplify the construction and assembly of the application and how to move components around and rewire the application to adjust to new business and cloud deployment conditions.

1. IBM Software Group
Developing Composite
Applications for the Cloud with
Apache Tuscany
Luciano Resende
lresende@apache.org
http://lresende.blogspot.com
Jean-Sebastien Delfino
jsdelfino@apache.org
http://jsdelfino.blogspot.com
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http://tuscany.apache.org

2. IBM Software Group
Agenda
 Cloud Computing – Goals and Challenges
 SCA – Goals and Overview
 SCA – Typical Scenarios
 Apache Tuscany
 Tuscany Demo – Rewiring Components in the Cloud
 Apache Nuvem
 Nuvem Demo – Cloud friendly Components
 Your Wish list?
 Getting Involved
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3. IBM Software Group
Cloud Computing
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4. IBM Software Group
Cloud Computing – Some Goals
 Up and running in seconds
 Cheap
 Scale up and down
 Agile, reconfigure applications
as business evolves
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5. IBM Software Group
Cloud Computing – Not so easy?
 Different platforms and APIs (even languages) to learn... does my
business logic need to know?
 Am I getting OS images on demand? Infrastructure? an application
platform?
 Changing pricing models?
 How do I integrate hybrid clouds, on premise + public cloud?
 How do the various parts of my app communicate? Which protocols am I
using?
 How do I assemble / integrate them?
 How do I configure the QOS I need?
 How do I automate deployment?
 Can I move some parts from one cloud to another?
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6. IBM Software Group
What is SCA ?
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7. IBM Software Group
SCA - Goals
 Abstract out technical APIs, protocols, QOS
 Allow me to focus on my business logic
 Give me a structure for componentizing my app
 Help me assemble, wire, rewire, move parts around
 OASIS Standard (in progress)
 Open Source implementations
 Apache Tuscany
 Fabric3
 a few others
 Product implementations
 Initial target: SOA, Web Services, multi-language apps, application
integration
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8. IBM Software Group
Can SCA components help you in the cloud?
 We've been using different clouds in our Apache Tuscany work and are
starting to realize that SCA components can help there too!
 Components that easily communicate over a network
 Components that shield you from different infrastructures
 A way to describe your app and how it's assembled / wired
 and can be distributed in a cloud or multiple clouds
 Move components around clouds and rewire your app
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http://tuscany.apache.org

9. IBM Software Group
SCA – Assembly Model
Service Interface Reference Interface
- Java Property - Java interface
- WSDL - WSDL PortType
Composite A
property setting
Component Component
Service A B Reference
promote wire promote
Service Binding Implementation Reference Binding
- Web Service - Java - Web Service
- JMS - BPEL - JMS
- JCA - SCA Composite - JCA
- SLSB - Spring - SLSB
- HTTP - JEE - HTTP
- JSONRPC - Scripting: Groovy, JScript, PHP, Python, Ruby, … - JSONRPC
- ATOM - XQuery - ATOM
-… -… -…
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10. IBM Software Group
SCA – Example assembly
<composite xmlns="http://docs.oasis-open.org/ns/opencsa/sca/200912"
xmlns:t="http://tuscany.apache.org/xmlns/sca/1.1"
targetNamespace="http://store"
Collection
atom name="store">
ShoppingCart <component name="Store">
<t:implementation.widget location="uiservices/store.html"/>
<service name="Widget">
Store <t:binding.http uri="/store"/>
jsonrpc </service>
Total <reference name="catalog" target="Catalog"/>
<reference name="shoppingCart" target="ShoppingCart/Cart"/>
currencyCode=USD <reference name="shoppingTotal" target="ShoppingCart/Total"/>
</component>
http
jsonrpc <component name="Catalog">
Currency
Catalog <implementation.java class="services.FruitsCatalogImpl"/>
Converter <property name="currencyCode">USD</property>
<service name="Catalog">
<t:binding.jsonrpc/>
</service>
<reference name="currencyConverter" target="CurrencyConverter"/>
</component>
<component name="ShoppingCart">
<implementation.java class="services.ShoppingCartImpl"/>
<service name="Cart">
<t:binding.atom uri="/ShoppingCart/Cart"/>
</service>
<service name="Total">
<t:binding.jsonrpc/>
</service>
</component>
<component name="CurrencyConverter">
<implementation.java class="services.CurrencyConverterImpl"/>
</component>
</composite>
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11. IBM Software Group
SCA – if you don't like XML
final Composite comp =
build(composite("http://sample", "test",
component("client-test",
implementation(ClientTest.class,
service(Client.class),
reference("jello", Hello.class),
reference("wello", Hello_wsdl)),
reference("jello", "jello-test"),
reference("wello", "wello-test")),
component("wello-test",
implementation(WelloTest.class,
service(Hello_wsdl),
reference("upper", Upper_wsdl)),
reference("upper", "upper-test")),
component("jello-test",
implementation(JelloTest.class,
service(Hello.class),
reference("upper", Upper.class)),
reference("upper", "upper-test")),
component("upper-test",
implementation(UpperTest.class,
service(Upper.class)))), ec);
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12. IBM Software Group
SCA – if you like Java annotations
@Remotable Component
Account
public interface AccountService {
Service
AccountReport getAccountReport(String customerID);
}
implmentation
public class AccountServiceImpl implements AccountService {
…
@Reference
public void setAccountDataService(AccountDataService value) {
accountDataService = value;
}
@Reference
public void setStockQuoteService(StockQuoteService value) {
stockQuoteService = value;
}
@Property
public void setCurrency(String value) {
currency = value;
}
…
}
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13. IBM Software Group
SCA – if you like to click around
• Eclipse STP Tools project provides SCA tooling
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14. IBM Software Group
SCA – Typical Scenarios
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15. IBM Software Group
Online Store
<composite xmlns="http://docs.oasis-open.org/ns/opencsa/sca/200912"
xmlns:t="http://tuscany.apache.org/xmlns/sca/1.1"
targetNamespace="http://store"
name="store">
Collection
atom <component name="Store">
ShoppingCart <t:implementation.widget location="uiservices/store.html"/>
<service name="Widget">
<t:binding.http uri="/store"/>
</service>
Store <reference name="catalog" target="Catalog"/>
jsonrpc
<reference name="shoppingCart" target="ShoppingCart/Cart"/>
Total
<reference name="shoppingTotal" target="ShoppingCart/Total"/>
currencyCode=USD </component>
<component name="Catalog">
jsonrpc <implementation.java class="services.FruitsCatalogImpl"/>
Currency <property name="currencyCode">USD</property>
Catalog
Converter <service name="Catalog">
<t:binding.jsonrpc/>
</service>
<reference name="currencyConverter" target="CurrencyConverter"/>
</component>
<component name="ShoppingCart">
<implementation.java class="services.ShoppingCartImpl"/>
<service name="Cart">
<t:binding.atom uri="/ShoppingCart/Cart"/>
</service>
<service name="Total">
<t:binding.jsonrpc/>
</service>
</component>
<component name="CurrencyConverter">
<implementation.java class="services.CurrencyConverterImpl"/>
</component>
</composite>
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16. IBM Software Group
Gateway / Mediation
Service
Gateway
jsonrpc
<composite xmlns=http://docs.oasis-open.org/ns/opencsa/sca/
ShoppingCart
200903
xmlns:t=http://tuscany.apache.org/xmlns/sca/1.1
targetNamespace=http://store name=”gateway">
<component name=”Gateway">
<implementation.java class="services.GatewayImpl"/>
<service name=”A">
<t:binding.jsonrpc/>
</service>
<reference name=”refService”>
<binding.x uri=“http://domain:8080/atomService”>
</reference>
</component>
</composite>
Service
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17. IBM Software Group
Feed Aggregator / Converter
<composite xmlns=http://docs.oasis-open.org/ns/opencsa/sca/200903
xmlns:t=http://tuscany.apache.org/xmlns/sca/1.1
RSS targetNamespace=http://store name=”feedAgregator">
RSS
Aggregator <component name="AtomAggregator">
<implementation.java class="feed.AggregatorImpl"/>
<reference name="sort" target="Sort"/>
ATOM
<reference name="atomFeed1">
Sort <tuscany:binding.atom
uri="http://apache-tuscany.blogspot.com/feeds/posts/default"/>
</reference>
RSS <reference name="atomFeed2">
ATOM <tuscany:binding.atom
uri="http://feeds.feedburner.com/blogspot/Dcni?format=xml"/>
Aggregator
</reference>
<property name="feedTitle">Atom Aggregator Sample</property>
ATOM </component>
<component name="Sort">
<implementation.java class="feed.SortImpl"/>
<property name="newFirst">true</property>
</component>
</composite>
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18. IBM Software Group
Business Integration – Travel Booking Process
JEE Components
POJOs
Spring Assemblies
Scripting Components
BPEL Processes
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19. IBM Software Group
Apache Tuscany
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20. IBM Software Group
Apache Tuscany
 Lightweight SCA runtimes
 Leverage and integrate with the Apache platform
 Active Open-Source community, started in 2005
 “Release early release often”, many releases
 Two release streams, 1.x (stable), 2.x (trunk)
 Working on OASIS SCA compliance
 Innovations beyond the SCA spec (JSON, REST, ATOM, Comet etc)
 SCA Java runtime, standalone or on Google AppEngine / Java, supports
Java, scripting, BPEL, Spring components, and many protocol bindings
 SCA Python runtime on Google AppEngine / Python
 SCA Native, supports C++ and Python components
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21. IBM Software Group
Tuscany Demo – SCA Component Rewiring
 SCA Java Application on EC2
 Push one component out to Google AppEngine / Java
 Rewrite it in Python and move it Google AppEngine / Python
 Move it to a native SCA runtime on EC2
 Easy runtime reconfiguration as you rewire the app
 You've got choices, and can be agile!
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22. IBM Software Group
Tuscany Demo – SCA Component Wiring
Configuration Repository
Fruit
Catalog
((Native))
store
Tuscany
Runtime Currency
Schell Converter
Fruit
Catalog
currencyCode=USD
((Python))
Catalog
jsonrpc
Fruit
Catalog
(Java)
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23. IBM Software Group
Apache Nuvem
Components for the Cloud
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24. IBM Software Group
Apache Nuvem - Overview
 New project in the Apache incubator
 Initial code contribution from Apache Tuscany
 A few technical components already there
 Running on Google AppEngine, today's demo also on EC2
 Project is just starting so there's a lot of room for innovation!
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25. IBM Software Group
Nuvem, REST, and Cloud friendly Components
 With REST, components get a simple GET/POST/PUT/DELETE interface
 More importantly it's a fixed interface
 Making components easier to assemble and compose
 Like Lego blocks!
 Web apps are starting to favor a protocol short list
 HTTP verbs with some format variations (XML, ATOM, RSS, JSON)
 That helps too!
 What if you had a palette of Cloud friendly components?
 Accessible through a simple REST interface
 To help simplify your apps and enable them to work on different clouds?
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26. IBM Software Group
Nuvem Demo – Technical Components
 SCA Java runtime on Google AppEngine / Java
 Using different implementations of a simple datastore component
 First using a HashMap
 Second using Google's Memcached
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27. IBM Software Group
Nuvem Demo – Technical Components
store
Currency
Converter
User
currencyCode=USD
Vegetables
Catalog Catalog
jsonrpc
MapDocument
Service
ShoppingCart
Manager
MapDocument
Service
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28. IBM Software Group
Nuvem Components – Wish list
 Simple data store cache
 Hierarchical cache, which can delegate to another cache
 Invocation cache, which caches responses to requests
 Key/value datastore
 Simple (S)QL datastore
 Datastore that understands master/slave replication and sharding
 XMPP chat
 Message queue
 Oauth 1.0/2.0 + OpenID
 User profile
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29. IBM Software Group
Cloud Components
 What's your wish list?
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30. IBM Software Group
Getting Involved
with Apache Tuscany
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http://tuscany.apache.org

31. IBM Software Group
SCA - Resources
 Good introduction to SCA
 http://www.davidchappell.com/articles/Introducing_SCA.pdf
 OASIS Open CSA – http://www.oasis-opencsa.org
 V1.1 level specs
 http://www.oasis-opencsa.org/sca
 Open CSA Technical Committees
 http://www.oasis-opencsa.org/committees
 OSOA
 http://osoa.org/display/Main/Home
 More information on that site
 http://osoa.org/display/Main/SCA+Resources
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32. IBM Software Group
Apache Tuscany Resources
 Apache Tuscany
 http://tuscany.apache.org
 Getting Involved
 http://tuscany.apache.org/getting-involved.html
 Tuscany SCA Java Releases
 http://tuscany.apache.org/sca-java-2x-releases.html
 http://tuscany.apache.org/sca-java-releases.html
 Tuscany SCA Java Documentation
 http://tuscany.apache.org/java-sca-documentation-menu.html
 Tuscany Dashboard
 http://tuscany.apache.org/tuscany-dashboard.html
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33. IBM Software Group
Getting Involved
with Apache Nuvem
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34. IBM Software Group
Apache Nuvem Resources
 Apache Nuvem
 http://incubator.apache.org/nuvem/
 Getting Involved
 http://incubator.apache.org/nuvem/nuvem-getting-involved.html
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35. IBM Software Group
Thank You !!!
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