Call RPG calls from WSO2 ESB

If the question is How to call AS400 DB2 RPG calls from WSO2 ESB, then the answer is PCML connector. It is a very convenient way to call RPG calls, as it can be done by doing only few configurations, with zero code. The rest is handled by WSO2 ESB!!.

A bit about RPG

RPG stands for Report Program Generator, and it a high level programing language specific for IBM AS400, More on RPG.

PCML Connector
A complete guide is in WSO2 ESB Connector documentation.

In order to call an RPG there are only few steps.
1. Save .pcml file in the registry. This should contain the RPG library string and the parameters (both input and output). When the parameters are defined the parameter type, length should be matched as in IBM documentation. For an example, if the parameter is a String value then the type should be char and the length should be matched to the length of the String.
2. pcml.init config in the calling synapse config should be defined. Under that, the server ip, username, password should be defined
3. The payload factory mediator can be defined to pass the payload with the parameters.
4. The pcml.call config to configure the .pcml file location and to call the PCML connector to get the things done.