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Ant is now used in many Java projects to control the build and distribution process. This book also uses Ant, and this chapter has described how this is done. Please note that the material in this chapter is not essential to understanding how Jini works, though.
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Discovering a Lookup Service
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ini uses a lookup service in much the same way as other distributed systems use naming services and traders. Services register with lookup services, and clients use them to find services they are interested in. Jini lookup services are designed to be an integral part of the Jini system, and they have their own set of classes and methods. This chapter looks at what is involved in discovering a lookup service/service locator; this is common to both services and clients. The chapter also discusses issues particular to the Sun lookup service reggie.
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Running a Lookup Service
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A client locates a service by querying a lookup service (service locator). In order to do this, it must first locate a lookup service. Similarly, a service must register itself with the lookup service, and in order to do so it must also first locate a lookup service. The initial task for both a client and a service is thus discovering a lookup service. Such a service (or set of services) will usually have been started by some independent mechanism. The search for a lookup service can be done either by unicast or by multicast. Unicast means that you know the address of the lookup service and can contact it directly. Multicast is used when you do not know where a lookup service is and have to broadcast a message across the network so that any lookup service can respond. In fact, the lookup service is just another Jini service, but it is one that is specialized to store services and pass them on to clients looking for them.
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Sun supplies a lookup service called reggie as part of the standard Jini distribution. The specification of a lookup service is public, and in the future we can expect to see other implementations of lookup services. There may be any number of these lookup services running in a network. A local area network (LAN) may run many lookup services to provide redundancy in case one of them crashes. Similarly, across the Internet, people may run lookup services for a variety of reasons; for example, a public lookup service is sometimes running on http://jan.netcomp.monash.edu.au to aid people trying Jini clients and services so they don t need to also set up a lookup service. Other lookup services may act as coordination centers, such as a repository of locations for all of the atomic clock servers in the world. Anybody can start a lookup service (depending on access permissions), but it will usually be started by an administrator, or started at boot time. Starting a lookup service used to be the hardest part of getting Jini working for the beginner. It could take hours or even days of playing with configuration files and network settings. It has now been made substantially easier: just
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CHAPTER 4 DISCOVERING A LOOKUP SERVICE
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run a DOS batch file or Unix shell script. At the top level of the Jini distribution is the directory installverify. Change to this directory and run the program LaunchAll, which will start an HTTP server, the lookup service reggie, and several other useful services. For the curious, LaunchAll uses the ServiceStarter described in a later chapter, which in turn uses the configuration file startAll.config. Configuration files are described in 19.
Unicast Discovery
Unicast discovery can be used when you know the machine on which the lookup service resides and can ask for it directly. This approach is expected to be used for a lookup service that is outside of your local network, but that you know the address of anyway (such as your home network while you are at work, or a network identified in a newsgroup or e-mail message, or maybe even one advertised on TV). Unicast discovery relies on a single class, LookupLocator, which is described in the next section. Basic use of this class is illustrated in the sections on the InvalidLookupLocator program. The InvalidLookupLocator should be treated as an introductory Jini program that you can build and run without having to worry about network issues. Connecting to a lookup service using the network is done with the getRegister method of LookupLocator, and an example program using this is shown in the UnicastRegistrar program in the getRegistrar section.
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