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Petals ESB (http://petals.ow2.org) is an Open Source ([LGPL License|http://www.gnu.org/licenses/lgpl.html]) Enterprise Service Bus (ESB) provided by the OW2 middleware consortium (http://www.ow2.org). The JBI specification defines a set of artifacts which are used to add connectivity, bind/expose services and configure the Service Bus.
The main artefacts are the JBI components which are divided in two families :
* *Binding Components* (BC) are "connectors" which are used to interface the JBI bus with the rest of the Information System (Green boxes in figure above). Binding Components enable both the exposure of external resources in the bus and the exposure of services available on the bus for their use by external consumers: e.g. connections to Web services, FTP, Mail, Message-Oriented Middleware, or even standard business communications like EDI or ebXML.
* *Service Engines* (SE) provide the integration logic (Blue boxes in the figure above). They typically handle messages that pass through the bus in order to provide routing (e.g. content-based routing, priority-based routing), transformation (XSLT), orchestration (BPEL), log or audit features.
In order to activate endpoints in the JBI environment, artifacts named *Service Units* (SU) must be deployed on the JBI component (both BC and SE). The SU contains configuration file which are used by the JBI component consume or provide a JBI service. A SU has two modes:
* Consumer : The component on which the SU is deployed on will consume the service described in the SU configuration file.
* Provider : The component on which the SU is deployed on will provide the service described in the SU configuration file.
Service Units are packaged in artifacts named *Service Assembly* (SA). The SA can contain a collection of SU plus a configuration file which describe on which component each SU must be deployed.
The last artefact defined in the JBI specification is the *Shared Library* (SL). The SL is an artefact which can be shared between JBI components. The components will potentially use the Java libraries and resources bundled in the SL to create their class loaders.
In this document, a JBI artefact will refer to the previously detailed items. More details on Binding Components, Service Engines, Service Units, Service Assemblies, Shared Libraries, their lifecycles and usage are described in the JBI specification.