Hi Asanka, I had a look into the feature set and it looks really useful. Please send us a PR and we will include this in a future ESB release.
On Wed, Mar 16, 2016 at 9:05 AM, Asanka Dissanayake <asan...@wso2.com> wrote: > Hi All, > I am developing a new Mediator for ESB as a pet project. After noticing > some draw backs in Payload Factory I thought of writing this one. > > Code can be found at : > https://github.com/asanka88/VelocityTemplateMediator > > @ESB Team: > If this make any sense, I am more than happy to contribute this with more > improvements. This is still under development. I will upload samples soon. > Your feedback is highly appreciated. > Why Velocity Template Mediator ? > > Currently synapse comes with built in payloadFactory mediator. But there > are several drawbacks in it. > > 1 Doesn’t support arrays : You cannot iterate though an array/collection > and add those elements to the payload. > > 2 Doesn’t support conditional expressions: In case you want to add > elements based on conditions payloadFactory doesn’t support it. > > 3 Readability is less since numbered placeholders like $1,$2 are used > > <https://github.com/asanka88/VelocityTemplateMediator#how-velocity-template-mediator-solve-them>How > Velocity Template Mediator solve them? > > Velocity template mediator uses well known Apache Velocity as the template > engine. You can do whatever you can do with Velocity in side this. Iterate > through collections, check conditions etc. In addition to that since we are > using place holders like $name,$age for the variables ,so it improves the > readability as well. > > On the other hand, there was no such a thing in Synapse to create a > property out of a template. > > For Example: When you call a soap back end, suppose you have to send a > user name token in SOAP Header. Suppose there are several back end calls > you need to make and in every call you need to pass the user name token. > > With the payload factory , you will have to create that part every time. > Instead if you can create a property one time using a template and save it > in the message context , you can reuse it without generating again and > again. > > With the Velocity Template Mediator , it supports body,property,soap > header,envelope as the targets. You can put the generated output to anyof > these. And it supports both xml and json formats > > Sample Syntax > > <velocityTemplate media-type="xml|json"> > <format> > <person> > <name>$name</name> > <age>$age</age> > </person> > </format> > <args> > <arg name="name" expression="$ctx:name" /> > <arg name="age" expression="$ctx:age" /> > </args> > <target target-type="property|body|custom|header" name="propertyName" > property-type="string|om" scope="synapse|axis2|operation" /> > </velocityTemplate> > > > Thanks, > Asanka D > > -- > > > *Asanka DissanayakeSoftware Engineer* > *WSO2 Inc. - lean . enterprise . middleware | wso2.com <http://wso2.com/>* > > *email: asan...@wso2.com <ruch...@wso2.com>, blog: > cyberwaadiya.blogspot.com > <http://cyberwaadiya.blogspot.com>, asankastechtalks.wordpress.com > <http://asankastechtalks.wordpress.com> mobile: +94 71 8373821* > > _______________________________________________ > Architecture mailing list > architect...@wso2.org > https://mail.wso2.org/cgi-bin/mailman/listinfo/architecture > > -- Thank you and Best Regards, Chanaka Fernando Senior Technical Lead WSO2, Inc.; http://wso2.com lean.enterprise.middleware mobile: +94 773337238 Blog : http://soatutorials.blogspot.com LinkedIn:http://www.linkedin.com/pub/chanaka-fernando/19/a20/5b0 Twitter:https://twitter.com/chanakaudaya
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