Leveraging Open Source Integration
with
WSO2 Enterprise Service Bus
Sumedha Rubasinghe
2009 Air Force Information Technology Conference
Montgomery, Atlanta

Agenda

The Need

Introduction

Features

Important Concepts

Extendibility

Performance

Use cases

Getting started & Help
2

3

4

5

6

7

Busbar
8

9

Introducing Mattson ...
Hi..
Mattson here..
I am an architect
10

So.. What is WSO2 ESB?
11

WSO2 Enterprise Service Bus

A fast,Light weight, easy-to-use Enterprise
Service Bus product

Open source product with commercial support
(if required)

Released with business friendly Apache License
2.0

Based on Apache Synapse

Customizable to match the needs of your
Enterprise
12

wait..
What is Apache Synapse?
How is it related to WSO2
ESB?
13

Apache Synapse & WSO2 ESB

Leading project developed by Apache
community

Some of the key committers with in WSO2

WSO2 ESB is built on top of Apache Synapse

Synapse provides the core mediation
capabilities

WSO2 ESB uses Synapse's configuration
language
14

Screenshots
15

Screen shots
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Screen shots
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In what type of scenarios
Can I use WSO2 ESB?
18

Usage scenarios

Link legacy files to messaging based systems

Transform CSV or EDI formats to XML

Act as a high-performance XML Gateway

Content-based routing and creating virtual
services

Integrate FIX based trading systems with XML
and non-XML backends

Log, trace and audit live systems
19

Tell me some of the
main features of WSO2 ESB
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WSO2 ESB Features

Message Routing

Message Transformation & Mapping

Scheduled Tasks

Orchestration

Protocol Switching

Transaction Support

Eventing
21

Message Routing

Act as a simple Proxy
22

Message Routing

Content based routing
23

Message Transformation & Mapping

XSLT
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Message Transformation & Mapping

XQuery
25

Message Transformation & Mapping

E4X
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Message Transformation & Mapping

Support for different file formats
– EDI
– flat files
– CSV
– COBOL/Record
27

Tasks

Allow the ESB to initiate work on a timed basis

Cron/simple interval

Write your own tasks
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Orchestration

Aggregate
29

Orchestration

Disaggregate
30

Orchestration

Callout
31

Orchestration

If/Then/Else
32

Orchestration

BPEL Feature plug-in
– Adds BPS capabilities into ESB
33

interesting...
34

Protocol Support
35

Protocol Support

File, (S)FTP, HTTP(S), REST, Hessian, JSON

SOAP

JMS
– MQSeries, AMQP/ Apache Qpid,Apache
ActiveMQ
– Transactional support

Email, XMPP,FIX,TCP
36

Rule based Mediation

Drools
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Many more features ...

Load balancing

Fail-over handling

Caching / Throttling

Registry based Clustering

WS-Reliable Messaging

FIX

CEP (Complex Event Processing)

and many more....
38

What if I want more?
Can I extend WSO2 ESB?
Yes.. you can..
Just write a mediator..
39

Mediator ..!!
what is that?
40

Important concept - Mediator
• Basic component of ESB
• Mediates messages going through
• Core mediators
– Send, Drop, Log, Property
• Filter mediators
– Filter, Switch, Validate, Throttle, In, Out
• Transformation mediators
– XSLT, Header, Fault, XQuery
• Advanced mediators
– Clone, Cache, Aggregate, DBLookup, Callout
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Important concept – Send Mediator
• Used to send out the messages
• Used in almost all the cases
• Wrapped an endpoint
– if no endpoint is specified, anonymous 'To'
address will be taken as the EPR
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Important concept – Sequence
• Special mediator
– List of mediators to be executed in an order
• Pipeline pattern
• Special sequences
– main
– fault
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Important concept – operation modes
• Act as a proxy
• Main Sequence
– If none of the proxy services matches the
request pattern
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I would like to have few
more mediator examples..
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Extendibility – Java Mediator
• Class implementing the Mediator interface
– Or AbstractMediator class
– Custom mediator is executed through the
ClassMediator in ESB
– Corresponding setter methods in the custom class
will be set before executing the custom mediator
if any properties are specified
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Extendibility - POJOCommand
• Extends the mediation capabilities using the
well known command pattern
– Class implementing the Command interface or
a POJO with a void execute() method
– execute() method will be invoked using the
Command interface or by using reflection
– Sets the properties before execution and
retrieves the properties after execution
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Extendibility – Script Mediator
• Enables scripting for extending mediation
• Supports all the Apache BSF scripting languages
– JRuby, Jython, Groovy, Java Script
• Embed the script inline or can be referred to a
separate script file with the function name to
be executed
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Extendibility – Spring Mediator
• Spring configurations to extend the mediation
• Spring bean must implement the Mediator
interface
• Refer to the spring application context using
the key
• The Spring bean is managed by the spring
context at mediation time
49

Extending WSO2 ESB

Registry as a repository
– Loading configuration from external registry

New Transports
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So how does all of these fit
together?...
What happens with-in WSO2
ESB?
51

Architecture
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Runtime
53

Deployment
54

Performance

Completely asynchronous architecture internally

Streaming support for messages

100% error free and zero memory leaks under heavy load

Up to 4500tps out-of-the-box for proxying
– Intel(R) Xeon(TM) 3.20GHz 2MB Cache
– Dual Core - 2 CPU system
– 2GB RAM
– 1Gb Ethernet

http://wso2.org/library/3740
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Performance

http://wso2.org/library/3740
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Non-Blocking IO
Synapse
Incoming req
Request
Thread1 processing Outgoing req
Socket open
Socket open
TIME
TIME
TIME
TIME
Incoming resp
Response
Thread2 processing
Outgoing resp
This model means:
1. Synapse threads never blocked during normal processing
2. Number of sockets open >> number of threads
57

Monitoring

Monitor System statistics

Running logs

Message Tracing

Dynamically configurable Logger

Exposes statistics via JMX

Dashboard – Google Gadgets
58

I would like to see some
Use cases where all of
these are applied...
59

Use Case 1
• Problem
– I want to send a notification email whenever there
is a request to a particular service which satisfies a
set of conditions over the request
• Solution
– Filter the messages over the request and evaluate
the conditions
– If the conditions evaluate to true then clone the
message
– Send the request to the desired endpoint while
forwarding a copy (may be after transformation) 60
through the mail transport

Use Case 1
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Use Case 1 - configuration
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Use Case 2
• Problem
– I have a service exposed over HTTP transport and
now I want the same service to be accessed through
JMS
• Solution
– Expose a proxy service with JMS (and what ever
transport) and switch the transport to HTTP (if not
http)
– Invoke the actual service with HTTP transport
– Switch the transport back to JMS of the response
message 63

Use Case 2
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Use Case 2 - Configuration
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Use Case 3
• Problem
– I want the ESB to invoke several services of the
same type for a request, evaluate all the responses
and respond me with the best one
• Solution
– Clone the message and send the requests to
different endpoints
– Get the responses from all services and aggregate
the responses
– Select the best out of the aggregated responses and
respond to the client
66

Use Case 3
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Use Case 3 - Configuration
68

Use Case 3 - Configuration
69

Use Case 3 - Configuration
70

Use Case 3 - Configuration
71

Use Case 3 - Configuration
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Use Case 4
• Problem
– I have a non secure service and now I want to
expose this service with security
• Solution
– Expose a proxy service
– Add security to that proxy service and specify the
policy on which you want to enforce security
– Invoke the actual service without security by
removing security headers in the request comes to
the proxy
– Add security for responses from the actual service 73
to client

Use Case 4
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Use Case 4 - Configuration
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Use Case 5 - FIX to HTTP transport
http://wso2.org/library/3837
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Use Case 6 - Eventing
•http://wso2.org/library/articles/fusion-eventing-soa
•http://wso2.org/library/articles/fusion-eventing-soa-part-2-eventing-using-
synapse-wso2esb 77

Use Case 7
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WSO2 Product Platform
79

That's lot of information...
Now I would like to try these out
myself. How do I get started?
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How to get started?

Download binary distribution from
http://wso2.org/projects/esb/java

Latest is v2.1.0

Unzip
• Run bin/wso2server.sh (on Unix) or
bin/wso2server.bat (on Windows)
• Management console
– https://localhost:9443/carbon
– admin/admin
81

Help.. I messed it up...
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How to get help?

Online forum

Active community of external users

Ample free documentation on wso2.org

If needed, we provided commercial support on
– Getting started
– Deployment
– Custom development
– Production support
83

I would like to have some
URLs for reference.
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Useful references
 WSO2 Oxygen Tank for Web Service Developers
– http://wso2.org

WSO2 ESB project page
– http://wso2.org/projects/esb

Performance testing
– http://wso2.org/library/3740
– http://wso2.org/library/2259
– http://wso2.org/library/1721

Apache Synapse
– http://synapse.apache.org
85

Summary
•Hypothetical Enterprise
•Brief Introduction on WSO2 ESB
•Features
•Important concepts
– Mediators
– Sequence
•Extendibility
•Use cases
•Getting started & Help
86

Thank you
sumedha@wso2.com
(on behalf of WSO2 ESB team)
87