Hi, As per the discussions we had on the Cloud Connector implementation in ESB, initially we came up with a model where we have a <*connector*> element for each connector invocation. That was mainly due to the limitations of Synapse because of Synapse doesn't support dynamic config at that time. Having a dynamic generation of config based each connector is having so many advantages over the fixed connector config approach.
So, we have modified synapse such that it can load dynamic configuration, iff a mapping template is defined as a mediation-library and imported in to the synapse config. There were few areas that we have to change to carter this requirement. - Initial sequence/mediator deployment during start-up. (Look for imports and resolve the dyn - Hot deployment of artifacts - Synapse library and import apis. In summary, the way how it works is: - Connector is implemented as a mediation library along with all the required templates and class mediators (or any other resource). Refer : * wso2_twitter.zip* - Once the connector (mediation lib) is deployed in the ESB, then the uses can import it with the use of synapse imports which will be applied globally for the synapse config. eg: *<import xmlns="http://ws.apache.org/ns/synapse"; name="twitter" package="org.wso2.carbon.connectors" /> * - Once the required connector (mediation lib) is imported, users can write the synapse config as the naming that's used in the connector. For instance, say that I have defined a template named "* twitter.update_status.xml*" in my connector, then a user can simply invoke the connect as follows. <sequence xmlns="http://ws.apache.org/ns/synapse"; name="doTweet"> <*twitter.update_status*> <parameter name="oauth.consumerSecret" value="xxxxxxxxxxx"/> <parameter name="oauth.accessTokenSecret" value="xxxxxxxxxxx"/> <parameter name="oauth.accessToken" value="xxxxxxxxxxx"/> <parameter name="oauth.consumerKey" value="xxxxxxxxxxx"/> <parameter name="status" value="WSO2 Twitter Connector - Dynamic Synapse config test for Twitter.... #wso2"/> </*twitter.update_status*> </sequence> - Please note that above config is completely dynamic as it is resolved by looking at the available connectors in the run time. So, any use can write its own connector and its own invocation language in the synapse config. Internally, the execution is pretty similar to a call-template mediator. With this approach, I've implemented the twitter connector for update status operation and it works fine. Please use the attached synapse-core patch and all the required config are also attached. - When it comes to tooling, DevStudio simply look at the provided connector archive (eg: *wso2_twitter.zip*) and it can easily find what are the operations provided by a given connector and generate graphical constructs(eg;one for tweet, one for retweet etc) as per the operations. Thanks. -- Kasun Indrasiri Associate Technical Lead WSO2, Inc.; http://wso2.com lean.enterprise.middleware cell: +94 71 536 4128 Blog : http://kasunpanorama.blogspot.com/
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