Real world scenarios with the WSO2 ESB

Three real world scenarios in some detail 1. XML transformation and message

augmentation 2. Financial services case – reading

legacy files and integrating with JMS 3. The PushMePullYou – using polling

to integrate two services

XML Transformation of messages with Database augmentation

This example illustrates how a database table lookup can be used to augment and transform the message payload, using XSLT transformations

Objective

Configure the external database access

Specify SQL and map parameters, and results

Transform using XSLT

Scenario – Financial Security blocking

Database

legacyflat file

NEW YORK

Existing System

WSO2 ESBPoll

Record->XMLXML->XML

Send

LONDON

WSO2 ESBSplit/Iterate

DBLookup/FilterTransform to MQ

Send

Existing System

XML/JMS

Overall ESB flow

FileSystemListener

NY Sequence

Log

Out-Only

Flatpack

E4X

Send to London

LondonEndpoint

LondonSequence

Iterate

DBReport – log whole msg

Filter/Drop NOAC

Send

Proxies

New York – File System Listener

New York Sequence

Flatpack Mediatorhttp://esbsite.org/resources.jsp?path=/mediators/paulfremantle/FlatPackMediator <class name="org.apache.synapse.mediators.contrib.FlatPackMediator"> <property name="ParserType" value="records_config"/> <property name="config"><PZMAP xmlns=""> <COLUMN name="INDICATOR" length="2"/> <RECORD id="D6" startPosition="1" endPosition="2" indicator="D6"> <COLUMN name="INDICATOR" length="2" /> <COLUMN name="ACTIONKEY" length="16" /> <COLUMN name="NA1" length="5" /> <COLUMN name="ACCNUM" length="15" /> <COLUMN name="ACTTYPE" length="6" /> <COLUMN name="SECID" length="12" /> <COLUMN name="SECIDTYPE" length="3" /> <COLUMN name="REGCODE" length="5" /> <COLUMN name="NA2" length="56" /> <COLUMN name="ONVF" length="3" /> <COLUMN name="NA3" length="244" /> <COLUMN name="UNITSEL" length="22" /></RECORD></PZMAP> </property></class>

Transforming using E4X

Scripting XML with E4X<script language="js"><![CDATA[ var rowset = mc.getPayloadXML() /* use the default namespace from the Flatpack mediator */ var ns = new Namespace("http://ws.apache.org/synapse/ns/rowset");

/* find all the D6 rows */ var d6 = rowset..ns::row.(@recordname=="D6"); /* create a holder element for the <FEED> elements */ var output = <FEEDS/>

for (var i=0; i<d6.length(); i++) { var row = d6[i]; /* lookup the important data */ var ActionKey = row.ns::entry.(@name=="ACTIONKEY").text(); var AccNum = row.ns::entry.(@name=="ACCNUM").text(); var ActType = row.ns::entry.(@name=="ACTTYPE").text(); var SecID = row.ns::entry.(@name=="SECID").text(); var SecIDType = row.ns::entry.(@name=="SECIDTYPE").text(); var ONVF = row.ns::entry.(@name=="ONVF").text(); var UnitsEl = row.ns::entry.(@name=="UNITSEL").text(); var RegCode = row.ns::entry.(@name=="REGCODE").text();

Scripting XML continued

var feed = <FEED> <ActionKey>{ActionKey}</ActionKey> <AccountNumber>{AccNum}</AccountNumber> <ActionType>{AccType}</ActionType> <SecurityID>{SecID}</SecurityID> <SecurityIDType>{SecIDType}</SecurityIDType> <ONVF>{ONVF}</ONVF> <UnitsElected>{UnitsEl}</UnitsElected> <RegCode>{RegCode}</RegCode> </FEED>; output.appendChild(feed); } mc.setPayloadXML(output); ]]> </script>

London - Iterate

Log the whole message

Final steps

PushMePullYou

Pull n Push scenario

Task Configurationspecify the taskimplementation

taskproperties

task scheduler configuration

Calling the data service

external data service endpoint

configuration

Calling Clearance Servicesplit the message into number of messages

transform the individual messages

clearance service

endpoint

Clearance Responsetransform the responses

from the clearance service

aggregate the responses from the clearance into one

response

Summary

Covered a set of useful casesChanging the flow of control Iteration and AggregationTwo ways of transforming XMLReading record formats Integrating with File-based systemsDBReport and DBLookup

Questions

Resources WSO2 Webinars

http://wso2.on.intercall.com WSO2 ESB documentation

http://wso2.org/project/esb/java/1.7/docs/docs_index.html

User Listesb-user@lists.wso2.org

Recent performance testinghttp://wso2.org/library/3740