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WSO2 ESB EI comes with an assortment of mediators to filter, transform, route and manipulate messages. When you have a scenario that requires functionality not provided by the existing mediators, you can write your own custom mediators to implement your specific business requirements. Your custom mediators then must be plugged into the WSO2 ESBEI. After adding them to the ESBEI, they function together with core mediators that come with the product. The custom mediators can be distributed in a packaged form that can be installed in another WSO2 ESB EI instance.
For more information, see Writing a WSO2 EI Mediator.
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