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Special care has to be taken for the definition of the News Cache's
interfaces to news readers and servers. Otherwise we would have to
adapt existing programs in order to allow them to cooperate with the
News Cache. However, it is obvious that this is impossible to adapt
all existing programs and therefore unacceptable. Hence we have to use
protocols already existing for the available news server and news
readers. Otherwise the acceptance of the News Cache would be too low.
- Client Interface
- The news cache has to provide the same
interface to its clients as a news server. This is the only way to
ensure that existing news readers can use the News Cache without any
modifications. The user of the news reader only needs to configure
the news cache as its news server.
- Server Interface
- Since we cannot define a new protocol for the
News Cache, the News Cache has to use the currently available
commands to retrieve articles from its news server. If we use the
commands available to a news reader, we have ensured that the news
server needs not be changed in any respect.
Next: News Cache Cooperation
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gschwind@infosys.tuwien.ac.at