By Jérôme Verstrynge
Useful JXTA II is a revision of the 1st version containing new and up-to-date examples protecting the newest introduced gains. This publication is an advent to JXTA, JXSE and P2P. a brand new bankruptcy approximately NAT traversal has been extra.
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Contrary to rendezvous peers, the relay peer concept is not covered by the JXTA specification document. It is a necessary by-product of the implementation of JXTA in Java over TCP/IP. We will describe this later. JXTA peers are not obliged to implement all JXTA protocols to participate on a JXTA network, but they are required to implement at least some of the core protocols described in the JXTA Core Specification together with corresponding concepts to make them operational. In other words, kings and queens must (at least) participate in the process of finding routes from one tribe island to another.
Towards Universality In order to implement P2P universally, one needs to establish a common communication language between peers, regardless of the technology they are using. One also needs to organize their transactions. This can be achieved with protocols. In a broad sense, a protocol is a set of rules explaining how an activity or a transaction should happen. Every society and culture has its own rules and ways of organizing itself. Signs, gestures and comments do not always have the same meaning from one culture to the other.
When the bottom protocols forward received messages to upper protocols, these messages are stripped from their layers to extract the core. We will briefly describe each type of JXTA message used by protocols. For more details, the reader should read the JXTA specification document. Metaphorically: A message is a dried leaf where kings and queens write the information they want to communicate to other tribes using the common languages of tribes. Endpoint Routing Protocol (ERP) Endpoint Service Before we describe the endpoint routing protocol, we need to describe the endpoint service.
