WSO2 Carbon is the base platform on which all WSO2 Java products are developed. Built on OSGi, WSO2 Carbon encapsulates all major SOA functionality. It supports a variety of transports, which make Carbon-based products capable of receiving and sending messages over a multitude of transport and application-level protocols. This functionality is implemented mainly in the Carbon core, which combines a set of transport-specific components to load, enable, manage and persist transport related functionality and configurations.
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Each transport implementation generally contains a transport receiver/listener and a transport sender, since they use the interfaces above. The Axis2 transport framework enables the user to configure, enable and manage transport listeners and senders independent to each other, without having to restart the server. For example, one may enable only the JMS transport sender without having to enable JMS transport listener.
There are two main types of transports: blocking and non-blocking. In a blocking transport, the I/O threads get blocked since the same worker thread that sends the request to the server will remain open to receive the response, until messages are completely processed by the underlying Axis2 engine. However, in non-blocking transports the worker thread that sends the request will not wait for the response and another thread will receive the response. Thereby, non-blocking transports increase the performance of the server.
The transport management capability of WSO2 Carbon is provided by the following feature in the WSO2 feature repository:
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