Gervas Douglas wrote:
> I was thinking in terms of the basic middleware providing
> cross-enterprise connectivity, but as you observe it does not really
> affect your answer. Now if one were to use a language-agnostic
> implementation of tuple spaces....
Gervas, as I commented in Anne's reply, I'm not seeing the "missing"
language-agonisticisms. The tools in the Jini Technology Starter Kit are
written in Java. The specification requires Java to implement, and many of the
features make explicit use of Java's mobile code. That starts to look an quite
a bit like a language dependent toolset.
However, TCP/IP is a binary protocol, as is HTTP, and many others that we find
implemented across a wide range of languages and platforms.
The features of Jini are the tools that you have access to. If you use Java,
you have access to mobile code and native language transport of RPC invocations.
If you don't use Java, you have access to the Javaspaces API, distributed
leasing, distributed transactions and any Jini services that you create with
explicit support of the Configuration mechanism that will allow you to plug in
exporters, invocation layer factories and endpoints.
It's all in how you view the use of the system's components in your SOA. Just
like many different implementation of many different technologies.
Interactions
across programming languages limit your choices in some ways. With Jini, like
Web Services implementations, you have a choice of how to interface.
The use of mobile code is what differentiates Jini from the what will come out
of all the WS standards that are developing to finally add the pieces needed to
effectively and correctly handle partial failure in a distributed systems
environment.
You may not ever use Jini, but someday you'll have access to tools that have
recreated it for you...
Gregg Wonderly
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