Apache Synapse is a lightweight and high-performance Enterprise Service Bus (ESB). Powered by a fast and asynchronous mediation engine, Apache Synapse provides exceptional support for XML, Web Services and REST. In addition to XML and SOAP, Apache Synapse supports several other content interchange formats, such as plain text, binary, Hessian and JSON. The wide range of transport adapters available for Synapse, enables it to communicate over many application and transport layer protocols. As of now, Apache Synapse supports HTTP/S, Mail (POP3, IMAP, SMTP), JMS, TCP, UDP, VFS, SMS, XMPP and FIX.
Apache Synapse is free and open source software distributed under the Apache Software License 2.0. The latest version of Synaspe is v2.1. This release comes with a horde of new features, bug fixes, performance and stability improvements.
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Apache Synapse is designed to be lightweight and fast. The non-blocking HTTP transport, the multi-threaded mediation engine and the streaming XML infoset combine to ensure that Synapse can mediate very high volumes of messages through the service bus with minimum delay and resource usage. Synapse also comes with comprehensive logging capabilities, statistics collection and JMX monitoring support which are crucial in production deployments.
Synapse uses Apache Axis2 as the underlying Web Services engine. Therefore it has outstanding support for Web Services and related standards such as SOAP and WSDL. Tried and tested Axis2 modules like Apache Rampart and Apache Sandesha2 can be used with Synapse with no configuration overhead. Using such external modules, Apache Synapse supports a range of Web Services standards including WS-Security and WS-Reliable Messaging. Synapse also makes use of the Axis2 clustering framework to provide enterprise grade clustering support.
Synapse is configured using a simple, XML-based configuration language. The configuration language and the related functional components are designed with SOA best practices in mind. It is trivial to store configuration fragments in an external SOA registry and import them to the mediation engine on demand. Synapse ships with a large collection of mediators that can be used to implement even the most complex enterprise integration scenarios. If necessary, the mediation engine can be extended by developing custom mediators using Java or your favorite scripting language.