On Dec 6, 2005, at 7:59 AM, Gregory Woodhouse wrote:
Single listeners work entirely in the VistA environment, but multi- listeners require some setup at the OS level. In this case, the daemon doesn't run in the MUMPS environment, but is a program that calls MUMPS to handle messages when they arrive.
Single listeners (which are really less efficient) are examples of what are called "iterative servers". There is a task (running under Taskman) that accepts a connection on the specified port, and that is the one and only connection on that port that can be handled. The HL7 package has historically treated TCP connections as "always on" serial links (in fact, MLLP is basically a serial protocol emulated over TCP). The normal thing to do is create a TCP connection and just leave it up. This really not a good way to handle TCP/IP protocols. The recommended approach is to listen or port 5000 (1.6) or 5001 (HLO) and accept all incoming connections there regardless of source using the OS, rather than the MUMPS environment, to handle this process. And yes, I know 5000 and 5001 are not IANA registered. I think the people that created the package were unfamiliar with the registration process or otherwise thought these ports were free for local use. (Actually, you have to go up to 10,000.)
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