Hi all,
I am working on implementing native JSON support for Synapse mediators. As part of the effort, we have to implement JSON support in all the relevant mediators and currently we have implemented native JSON support to Iterate, Aggregate and Enrich mediators. We have to implement it for ForEach, Header, Publish Event, Rule and Call Template mediator. Other mediators either already have JSON support or not relevant to handling JSON payloads (eg XSLT mediator). Please see the attachment for a complete analysis. Initially all the JSON payloads sent to the Synapse got transformed into XML and all the mediators manipulated the payload as XML using XPath. This approach led to some issues such as some of the original information in the JSON payload was lost during the conversion. As a remedy, it was decided to implement native JSON support to the mediators. The original payload exists as a stream in the Message Context and the JSON supported mediators use that stream to do the data manipulation and after the manipulation, the stream and the SOAP envelope are updated. Currently the problem is that, to handle JSON payloads natively, we can only use JSON supported mediators in the mediation. If we use a non JSON supported mediator, the JSON payload in the JSON stream becomes obsolete and we have to use XPath to manipulate the JSON payload in the remaining mediators. As a solution, we can implement JSON support for all the relevant mediators and minimize this problem. This solution is totally backward compatible and existing users can continue to manipulate JSON payload via XPath if they want. To give users more control over the payload, we are also planning to introduce a new Transform mediator which will take a payload and a schema as input, and it will give out a modified payload according to the schema as output. [image: Transform mediator (2).png] Any suggestions or concerns are highly appreciated. Thanks & Regards, Arunan -- *Sugunakumar Arunan* Software Engineer | WSO2 Email : [email protected] Mobile : +94766016272 Web : http://wso2.com <https://wso2.com/signature>
EI Mediators analysis.pdf
Description: Adobe PDF document
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