1. WSO2 Advantage Webinar - JSON Support in the WSO2
Platform
Ishan Jayawardena
Software Engineer

2. About WSO2
• Providing the only complete open source componentized cloud platform
Dedicated to removing all the stumbling blocks to enterprise
agility
Enabling you to focus on business logic and business value
• Recognized by leading analyst firms as visionaries and leaders
Gartner cites WSO2 as visionaries in all 3 categories of
application infrastructure
Forrester places WSO2 in top 2 for API Management
• Global corporation with offices in USA, UK & Sri Lanka
200+ employees and growing
• Business model of selling comprehensive support & maintenance for
our products

3. JSON
●
A data interchange format that is,
Lightweight
Text-based
Language independent
Human/machine readable
●
A better data interchange format
●
JSON and JavaScript
●
JSON object
{“company” : “WSO2 Inc.”, “product” : “ESB”}
●
Internet Media type
application/json

4. JSON Support in WSO2 Platform
●
Message Builders and Message Formatters
●
Constructing, and processing payloads
JSON, and XML with Script mediator
●
Converting message type between JSON and XML

5. Message Builders and Formatters
●
What do they do?

6. Message Builders and Formatters
● What message builders and formatters are available for JSON?
● Builds XML infoset
org.apache.axis2.json.JSONBuilder.
org.apache.axis2.json.JSONMessageFormatter
● Process as JSON
org.apache.axis2.json.JSONStreamBuilder
org.apache.axis2.json.JSONStreamFormatter
● How to configure
Register Builder/Formatter in
ESB_HOME/repository/conf/axis2/axis2.xml
<messageBuilder contentType="application/json"
class="org.apache.axis2.json.JSONStreamBuilder"/>
<messageFormatter contentType="application/json"
class="org.apache.axis2.json.JSONStreamFormatter"/>

7. Constructing, Processing Payloads
● Script mediator with JavaScript
<script language="js"><![CDATA[
var symbol = ...
var price = ...
mc.setPayloadJSON({
"quote" : {
"code" : symbol,
"price" : price
}
});
]]></script>
● Where to construct payloads?
In sequence, out sequence
● Setting “messageType” property - Optional
<property name="messageType" scope="axis2"
value="application/json"/>

8. Constructing, Processing Payloads
●
Script mediator functions
XML:
mc.setPayloadXML(xmlObject)
mc.getPayloadXML()
JSON:
mc.setPayloadJSON(jsonObject)
mc.getPayloadJSON()
●
Message Context variable; mc

9. Constructing, Processing Payloads
●
Using script functions
<script language="js"><![CDATA[
var symbol = mc.getPayloadXML()..*::symbol.toString();
var price = parseFloat(mc.getPayloadXML()..*::last);
mc.setPayloadJSON({
"Quote" : {
"Code" : symbol,
"Price" : price,
"Current" : {
"High" : parseFloat(mc.getPayloadXML()..*::high),
"Last" : parseFloat(mc.getPayloadXML()..*::last)
}
},
"Status" : (price >= 100 ? "OK" : "NOT-OK")
});
]]></script>
●
E4X, and JavaScript functions for payload operations

10. Constructing, Processing Payloads
Demo

11. Constructing, Processing Payloads
Demo

12. Converting between XML and JSON
●
Script mediator functions
XML:
mc.toXMLPayload(jsonObject, [content-type])
<script language="js"><![CDATA[
var jsonResponse = mc.getPayloadJSON()
mc.toXMLPayload(jsonResponse);
]]></script>
JSON:
mc.toJSONPayload(xmlObject, [content-type])
<script language="js"><![CDATA[
var xmlResponse = mc.getPayloadXML()
mc.toJSONPayload(xmlResponse);
]]></script>

13. Converting between XML and JSON
Demo

14. Converting between XML and JSON
Demo

15. Other JSON Builder/Formatter
●
Converts JSON into SOAP/XML
org.apache.axis2.json.JSONBuilder
org.apache.axis2.json.JSONMessageFormatter
●
Best for;

16. Summary
●
Stream Builder/Formatter + Script mediator

17. Questions

18. 150+ globally positioned support customers

19. Thank you!

20. Engage with WSO2
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