Wednesday, July 25, 2007

server/client mean -- ports^1-jvm

a "server" is traditionally a separate jvm or unix process but nowadays occasionally can refer to a method (or set of methods) your "client objects" can call within a container.

In the same vein, a "client" used to mean a number -- a process id (or thread), often on a different host, but now in Java literature it often means a "caller of a method". A caller of a method may or may not be an object in memory, but always refers to some "calling context" to be altered by the method.

Every OO students would eventually come to realize when to say "client" and what that implies.

The j2ee community seem to pay little attention to the question "same or separate jvm?"

A "service" is often provided by the container.

The "server" usually provides some utility service like water and electricity.

Examples?

Perhaps not a good example. jndi is obviously a container service. It can be filesystem-based.

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