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CHAPTER 25 ACTIVATION
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<property name="src.files" value=" common/MIMEType.java, common/FileClassifier.java, rmi/RemoteFileClassifier.java, activation/FileClassifierImpl.java activation/RenewLease.java activation/FileClassifierServerLease.java "/> <property name="class.files" value=" common/MIMEType.class, common/FileClassifier.class, activation/FileClassifierServerLease.class "/> <property name="class.files.dl" value=" rmi/RemoteFileClassifier.class "/> <property name="class.files.act" value="common/MIMEType.class, common/FileClassifier.class, rmi/RemoteFileClassifier.class, activation/RenewLease.class activation/FileClassifierImpl.class "/> In order to run the server, the following need to be running: reggie to run as a lookup service. phoenix to act as an activation server for the FileClassifier service and also for the RenewLease service. norm as a lease renewal service. Each lease will be registered with this service, and it will have the RenewLease as listener for expiration events. The server starts, finds lookup services, and registers the service with each of them. Each lease that it gets is also registered with the lease renewal service, and the listener is also registered. The server then terminates. The lease renewal service renews leases with the lookup service. When the lease renewal set is about to expire, it wakes up the lease renewal listener, which renews the set. Note that since the listener is activatable, this wake-up is performed by the activation server phoenix. Trace messages from the listener thus appear in whatever window the activation server is run from.
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LookupDiscoveryService
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It is easy enough for a server to discover all of the lookup services within reach at the time it is started, using LookupDiscovery. While the server continues to stay alive, any new lookup
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CHAPTER 25 ACTIVATION
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services that start will also be found by LookupDiscovery. But if the server terminates, which it will for activatable services, then these extra lookup services will probably never be found. This results in the service not being registered with them, which could mean in turn that clients may not find it. This is analogous to leases not being renewed if the server terminates. In Jini 1.1, there is a LookupDiscoveryService that can be used to continuously monitor the state of lookup services. It will monitor these on behalf of a service that will most likely want to register with each new lookup service as it starts. If the service is an activatable one, the server that would have done this will have terminated, as its role would have just been to register the service with phoenix. When there is a change to lookup services, the LookupDiscoveryService needs to notify an object about this by sending it a remote event (actually of type RemoteDiscoveryEvent). But again, we do not want to have a process sitting around waiting for such notification, so the listener object will probably also be an activatable object. The LookupDiscoveryService interface has the following specification: public interface LookupDiscoveryService { LookupDiscoveryRegistration register(String[] groups, LookupLocator[] locators, RemoteEventListener listener, MarshalledObject handback, long leaseDuration); } Calling the register() method will begin a multicast search for the groups and a unicast lookup for the locators. The registration is leased and will need to be renewed before expiration (a lease renewal service can be used for this). Note that the listener cannot be null this is simple sanity checking, because if the listener were null, then the service could never do anything useful! A lookup service in one of the groups can start or terminate, or it can change its group membership in such a way that it now does (or doesn t) meet the group criteria. A lookup service in the locators list can also start or stop. Any of these changes will generate RemoteDiscoveryEvent events and call the notify() method of the listener. The event interface includes the following: package net.jini.discovery; public interface RemoteDiscoveryEvent { ServiceRegistrar[] getRegistrars(); boolean isDiscarded(); ... } The list of registrars is the set that triggered the event. The isDiscarded() method is used to check if it is a discovered lookup service or a discarded lookup service. An initial event is not posted when the listener is registered; the set of lookup services that are initially found can be retrieved from the LookupDiscoveryRegistration object returned from the register() method, by its getRegistrars()method.
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