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Introduction to Apache Synapse

Introduction to Apache Synapse



This is the presentation I did at Apache Asia Roadshow 2009 held at Colombo, Sri Lanka. My talk was titled "Introduction to Apache Synapse". In this presentation, I attempt to address areas like ...

This is the presentation I did at Apache Asia Roadshow 2009 held at Colombo, Sri Lanka. My talk was titled "Introduction to Apache Synapse". In this presentation, I attempt to address areas like enterprise integration problems, ESB pattern, Synapse architecture, features and the configuration model.



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    Introduction to Apache Synapse Introduction to Apache Synapse Presentation Transcript

    • Introduction to Apache  Synapse Hiranya Jayathilaka (hiranya@apache.org)
    • What to Expect… • The problem and the solution – Integration problems in enterprise • Introducing Apache Synapse – Architecture and the functional components • Case Studies – Synapse in action • Finishing touches – Extension points and next steps
    • The Problem & The Solution
    • Software in Enterprise • Large enterprises have many software  systems – Enterprise resource planning applications – Management information systems – Decision support systems – Executive support applications • The systems are often independent • But they are all parts of a larger business  process
    • Need for Enterprise Integration • Individual software systems cannot  achieve much • Systems should be integrated to work  together – Enables free data flow across the firm – Each application becomes aware of the ‘big  picture’ – Improves operational and management  efficiency
    • Easier Said Than Done! • Integrating a multitude of complex  applications is no child’s play • Systems are diverse (way too diverse) – Different platforms (OS and program runtime) – Different programming languages – Different messaging standards and protocols – Different QoS requirements
    • Is It Possible at All?
    • ESB to the Rescue! • A software architecture construct that  provides fundamental services for complex  architectures – Message routing – Message transformation – Protocol switching – Adding QoS to message flows – And everything else integration architects  would ever need
    • ESB Explained! • An architectural style or an piece of  software that resembles a physical data  bus • Applications communicate via the bus,  which acts as a message broker • Replaces direct contact between software  – Reduces coupling • Based on industry standards
    • ESB Saves the Day!
    • Introducing Apache  Synapse
    • What is Apache Synapse? • A high performance ESB implementation – Fast – Lightweight – Low resource usage • Easy to configure and deploy • Developed as a middleware with many  extension points • Very mature and stable code base
    • Key Features • Supports many messaging standards  – SOAP 1.1/1.2 and WS­* standards – REST/POX • A wide range of communication protocols – HTTP/S, JMS, Mail, VFS, FIX, AMQP • Load balancing and fail over support • Task scheduler and the eventing mode • JMX monitoring support
    • Architecture • Non blocking HTTP transport – Network IO do not hog server worker threads – Based on Apache HTTP Core NIO • Multithreaded mediation engine • Streaming model – The byte stream coming over the wire is  ‘streamed’ through the mediation engine – Powered by Apache AXIOM
    • Functional Components • Responsible for processing messages  inside the ESB and coordinating bus  activities • Can be combined, mixed and matched to  implement  complex message flows and  enterprise integration patterns • The task of configuring Synapse is most of  the time putting the right set of functional  components together
    • Mediators • The simplest functional component • Takes an input message, performs some  action on it and outputs the processed  message
    • Sequences • A cascading chain of mediators • Input messages are sent through all the  child mediators of the sequence • Resembles an industrial pipeline
    • Endpoints • Defines an endpoint reference (EPR) to  which messages can be sent/forwarded  from Synapse • Various operational constraints can be  enforced on endpoints – Timeout configuration – Message format (SOAP 1.1/1.2, POX) – QoS expectations (WS­Security, WS­RM)
    • Proxy Services • Acts like a virtual service that can accept  requests from clients • Received client requests are processed  and forwarded to an actual service  implementation  • Response from the backend service is  processed and routed back to the clients
    • Other Components • Scheduled Tasks – Used to run a programmed activity periodically • Event sources – Enables Synapse to act as an event broker in an  event driven architecture • Local entries – Used to store small configuration/data items • Registry – A metadata store for your SOA
    • Configuration Model • Synapse configuration language is used to  define, configure and combine functional  components • XML based • Very intuitive – Easy to learn, understand  and remember • Entire configuration goes into the  synapse.xml file
    • Case Studies
    • Case Study 01 • Problem: – How to expose an existing service over a  different schema? • Solution: – All the incoming requests should be transformed  into the format expected by the service – All the responses should be transformed to the  format expected by the client
    • Solution Structure
    • Demonstration
    • Case Study 02 • Problem: – How to expose an existing HTTP service over  JMS? • Solution: – A new (virtual) service should be created to  accept messages over JMS – The virtual service should forward the  messages to the existing service over HTTP
    • Solution Structure
    • Demonstration
    • Want to Try More? • Apache Synapse is shipped with a large  number of sample configurations that you  can try out of the box • Follow the samples guide included in the  distribution or refer the online version of it:  – http://synapse.apache.org/Synapse_Samples.html • Java and Apache ANT are required to try  out the samples
    • Finishing Touches
    • Extension Points • Custom mediators • Custom tasks • Script mediator • POJO command mediator • Spring mediator • Transport receivers and senders • Load balance algorithms • Message formatters and builders
    • Feel Like Contributing? • Project website – http://synapse.apache.org • Code base – https://svn.apache.org/repos/asf/synapse • Mailing lists – http://synapse.apache.org/mail­lists.html • JIRA Issue tracker – http://issues.apache.org/jira/browse/SYNAPSE
    • Questions?
    • Thank You!