Oracle Mediator is a service component of the Oracle SOA Suite that provides mediation capabilities such as selective routing, transformation, and validation capabilities, along with various message exchange patterns, such as synchronous, asynchronous, and event publishing or subscriptions.

Mediator provides a lightweight framework to mediate between various components within a composite application, such as business processes, human workflows, and so on, using a Web Services Description Language (WSDL) document as the interface. Mediator converts data to facilitate communication between different interfaces exposed by different components that are wired to build a SOA composite application. For example, Mediator can accept data contained in a text file from an application or service, transform it into a format appropriate for updating a database that serves as a customer repository, and then route and deliver the data to that database.

Mediator facilitates integration between events and services, where service invocations and events can be mixed and matched. You can use a Mediator service component to consume a business event or receive a service invocation. A Mediator service component can evaluate routing rules, perform transformations, validate, and either invoke another service or raise another business event. You can use a Mediator service component to handle returned responses, callbacks, faults, and timeouts.