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From "Sagara Gunathunga (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AXIS2-5270) Improve Json support in Axis2 with google-gson
Date Fri, 16 Mar 2012 07:51:51 GMT

    [ https://issues.apache.org/jira/browse/AXIS2-5270?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13230952#comment-13230952
] 

Sagara Gunathunga  commented on AXIS2-5270:
-------------------------------------------

I will provide detailed review later following are some of my obvious observations. 

1.) At the moment your JsonRpcMessageReceiver only work with JSON messages but services should
be accessed by both XML and JSON payloads. What you can do here is set a boolean property
to the MessageContext  in the JsonBuilder class and check that property  in the JsonRpcMessageReceiver#invokeBusinessLogic
method if the value is not set of false then you can assume request is not JSON and should
fullback to use super class's invokeBusinessLogic method.  

2.) Processing fail if I use endpoint address up to service level ( e.g - http://localhost:8080/axis2/services/JsonTestService)
without operation part.  Considering non HTTP transports we need to address this issue too.


May be you could use wrapper JSON element ( e.g - EchoStudent ? ) to dispatch operation. This
is required to read first element from JSON stream before unmarshaling. I'm not sure about
feasibility of  this idea but you can do a POC on this.

   
                
> Improve Json support in Axis2 with google-gson
> ----------------------------------------------
>
>                 Key: AXIS2-5270
>                 URL: https://issues.apache.org/jira/browse/AXIS2-5270
>             Project: Axis2
>          Issue Type: Improvement
>          Components: json
>    Affects Versions: 1.7.0
>            Reporter: Shameera Rathnayaka
>            Assignee: Shameera Rathnayaka
>              Labels: gsoc2012, gson, json
>             Fix For: 1.7.0
>
>         Attachments: attachments.zip
>
>
> There are two ways that xml string can be converted into JSON string, Badgerfish and
Mapped . Current Axis2 with JSON module completely supports Badgerfish convention[1] while
partialy supports Mapped convention[1] as Mapped formatted JSON with namespaces are not supported
in Axis2. Therefore if the client side java-script code needs to talk with java service which
is deployed in Axis2, it should be sent as Badgerfish convention. It is cumbersome to generate
Badgerfish convention of JSON string again and again to call services if there is no  xml
representation string in client side.
> If java script client can send JSON object to relevant java service in Axis2, defining
service and operation in request url, without doing any modifications to JSON objects, then
it would be very helpful for Java-Script users at client side.
> According to the thread in the mailing list, which discussed $subject we have two approaches.
i have summarized those two approaches as below. 
> 1. Store json inputstream in message context at the message builder while putting dummy
SOAPEnvelop to the message context, and using google-gson process it inside the message receiver

> 2. Preserve the requirement that a message must have a well defined SOAP infoset and
use a trivial representation similar (or identical) to what we use for plain text. This has
the advantage that it is more in line with the rest of the Axis2 architecture, 
>     or 
>    another option is to write an xmlstream reader/writer implementation to parse the
json stream. And provide that xml stream implementation to Axiom. 
> [1]http://wso2.org/library/768

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