Message Transformation is a common use case in WSO2 Enterprise Integrator (WSO2 EI). When it comes to message transformations, you can use the FastXSLT mediator, XSLT mediator, Script mediator as well as the PayloadFactory mediator. This section describes different message transformation use cases and parameters you can configure for optimal performance.
Comparison of the
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FastXSLT mediator and the XSLT mediator
The FastXSLT Mediator and XSLT mediator can be used to do XSLT based message transformations in WSO2 EI. Both mediators can be used to perform complex message transformations. The FastXSLT mediator has significant performance over the XSLT mediator as it uses the streaming XPath parser and applies the XSLT transformation to the message stream instead of applying it to the XML message payload, but with the FastXSLT mediator you cannot specify the source, properties, features, or resources as you can with the XSLT mediator.
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Always use the FastXSLT mediator instead of the default XSLT mediator for better performance in implementations where the original message remains unmodified. In implementations where the message payload needs to be pre-processed, use the XSLT mediator instead of the FastXSLT mediator. Any pre-processing performed on the message payload is not be visible to the FastXSLT mediator, because the transformation logic is applied to the original message stream instead of the message payload. |
Optimizing the XSLT Mediator
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