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As an agile ESB, ServiceMix allows plug-in services which can combine to create a service oriented architecture. ServiceMix allows these services to operate in an event driven way as well. In other words, the services are decoupled and listen on the bus for service requests. The bus is responsible for quality of service (QoS) features such as message persistence, guaranteed delivery, failure handling, and transaction support.

ServiceMix supports event driven architecture for events occurring both internal and external to the bus. In other words, JMS binding components can listen for the arrival of messages, i.e., the "event" on topics or queues which are external to the bus, while other binding components and service engine components can listen for messages on the normalized message bus.

While decoupled (EDA) operation (as described in the previous two paragraphs) is more appropriate for the scalability and reliabilty required for high transaction production environments, synchronous request/response communication found in SOA implementations, is also supported. Thus, ServiceMix effectively combines SOA and EDA for the development and deployment of composite enterprise applications.

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