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A connectionless service
is one in which there is no long term connection between consumers
and producers as multiple messages are passed back and forth.
Connectionless services can be either stateful
or stateless.
Web services
are built as connectionless services in order to improve scalability
over connection-oriented
services. A connectionless service can behave like a connected
service by building it as a stateful service.
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One thing to point out, though, is that connected
vs. connectionless is a concept that can vary depending on what
level you're observing. SOAP messages
being sent over HTTP are connectionless
to the programmer. However, HTTP itself is a request and response
sent back and forth over a short-lived connection using TCP, a
connection-oriented protocol. TCP in turn is implemented on a
connectionless protocol: IP.
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