3. Writing a Service
Dare to be naïve.
—R. Buckminster Fuller
The MessageStream interface is designed to work for many purposes. We will now show you two example implementations of a message stream service. The first will be a FortuneStream subinterface that returns randomly selected “fortune cookie” messages. The second will provide a chat stream that records a history of a conversation among several speakers. First, though, we must talk about what it means to be a Jini service.
A service differs from a client in that a service registers a proxy object with a lookup service, thereby advertising its services—the interfaces and classes that make up its type. A client finds one or more services in a lookup service that it wants to use. Of course, ...
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