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Context and Configuration
HierarchyEngine is stateless !!Context and Configuration Hierarchymaintains Engine StateContext running stateConfiguration deployment state
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Extensible Messaging Engine
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The Messaging Engine - Phases
What are HandlersConcept of Phases
A phase is a particular stage in execution.E.g. pre-dispatch, Transport
Each Phase contains a group of Handlers
Handlers are linked to rules that say wherethe handler should go
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The Messaging Engine - Phases
(Cont)Standard Phases
Transport phase
Pre-dispatch phaseDispatch phasePost-dispatch phase
Policy determination phase
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Pluggable Modules
Extensions for the server Meant to provide a specific functionality
E.g. Security,Reliability etc
Consists of Handlers
Special Module classA Descriptor (module.xml)
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Pluggable Modules (Cont..)
Archived to make a single bundleKnown as a .mar file
Concept of Engaging Engaging a module means activating itCan be done
Per SystemPer ServicePer Operation
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Pluggable Modules - Example
The WS-Addressing moduleContains
Addressing-in handler Placed in the pre-dispatch phase in pipe
Addressing out handler Placed in the message-out out pipe
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Improved Deployment Model
Faster and Easier DeploymentService Archive files (.aar files)
A collection of resources needed for a serviceIncludes
Service implementationHandlers (optional)
Service descriptor (service.xml)
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Improved Deployment Model
(Cont)Hot Deployment
Drop in deployment
Uploaded throughFile systemAxis2 web application
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New Client API
Supports an Asynchronous programmingstyle
Concept of callbacks for the clientCan handle both transport dependent andtransport independent asynchrony.
Based on the MEP ClientCan be extended to support custom MEPs
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Extensible Data Binding
How to provide data binding support ?Use a well established framework
Avoid reinventing the wheel!FlexibleAdds more functionality
E.g. XMLBeans supports the complete XML Schema
Features an API that can bind to another data binding framework
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Extensible Data Binding (Cont )
Currently supported frameworksXMLBeans
We also plan to Axis data bindingframework by default.
Sufficient for simple data binding needs
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Installation
Download distribution fromhttp://ws.apache.org/axis2/
Deploying in a servlet container Using web administration interfaceInstalling Axis2 Eclipse plug-ins
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Sample 1 - Client Demonstration
Accessing an existing endpointInteroperability test 2 hosted at
http://soapinterop.java.sun.com:80/round3/gro
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Sample 2 - Implementing and
Deploying a serviceAirline Reservation SystemLets start with the contractImplementing and the contractAccessing the Service
Now, lets start with implementationUsing web admin
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Sample 3 - Developing Extensions
- ModulesModulesLogging ModuleWriting a moduleWriting handlers
Handler APIAccessing SOAP message contentContext Hierarchy
Adding handlers to phasesDeploying the moduleEngaging the module to the service
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Developing Extensions Extending
Message Receiver
Interfaces engine and service implementation
Help to support different MEPs
Supporting services written in languages that are
being compiled to JVMGroovy Sample
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Developing Extensions
Supporting Custom MEPs
Writing a new Message Receiver Introducing an Operation Context
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If time permits .
MTOM supportMultiple Transport supportREST Support
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Synergy
Become a contributor Join axis-dev (filter on [axis2])
You can find this presentation thereWeekly IRC chats on WednesdaysSubmit ideas, codeBecome a committer
Use it. Yes, Its a help !!!Submit ideas, bugsShare experience
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Summary
IntroductionInstallationClient demonstration - Accessing Google spell checker serviceImplementing and deploying a serviceDeveloping extensions
Writing handlers and modules
Supporting custom MEPsOther features (Sessions, Phases, REST, MTOM)
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Thank You .
Question Time ..
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StAX
AXIOM
Module
Framework(Modules, Handlers and Phases) Engine
Registry
Transport and Data binding
Core
Application
Tran
sport
P h a s e
Z P h a s e
Y P h a s e
X
XML
Message
Engine
MessageReceiver
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Registry
Modules
Engine
Contexts
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Registry
Modules
Engine
Contexts
