DU261 The DiscoveryListener Interface in Java

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DU261 The DiscoveryListener Interface
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The public methods specified by the DiscoveryListener interface are as follows:
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package netjinidiscovery; public interface DiscoveryListener extends EventListener { public void discovered(DiscoveryEvent e); public void discarded(DiscoveryEvent e); }
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When an entity employs an object that implements one or more of the discovery management interfaces to perform and manage the entity's discovery duties, the entity often will want that object generally referred to as a discovery utility to notify the entity when a desired lookup service is either discovered or discarded The DiscoveryListener interface defines a mechanism through which an entity may receive such notifications from a discovery utility When an entity registers interest in these notifications, an implementation of this interface must be provided to the discovery utility being employed Through this registered listener, the entity may then receive instances of the DiscoveryEvent class, which encapsulate the required information associated with the desired notifications
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The Semantics
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The events received by listeners implementing the DiscoveryListener interface can be the result of either group discovery or locator discovery These events contain the discovered or discarded registrars, as well as the set of member groups corresponding to each registrar (see the specification of the DiscoveryEvent class) The discovered method is called whenever a new lookup service is discovered or a discarded lookup service is re discovered The discarded method is called whenever a previously discovered lookup service is discarded because the lookup service was determined to be either unreachable or no longer interesting to the DU2 The Discovery Management Interfaces 173
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O'Reilly Network Safari Bookshelf Jini Specifications, The, Second Edition entity, and the discard process was initiated by either the entity itself (an active discard) or the discovery utility employed by the entity (a passive discard) This interface makes the following concurrency guarantee For any given listener object that implements this interface or any sub interface, no two methods (either the same two methods or different methods) defined by the interface (or sub interface) can be invoked at the same time For example, the discovered method must not be invoked while the invocation of another listener's discarded method is in progress
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DU262 The DiscoveryChangeListener Interface
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The DiscoveryChangeListener interface specifies only one public method:
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package netjinidiscovery; public interface DiscoveryChangeListener extends DiscoveryListener { public void changed(DiscoveryEvent e); }
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In addition to being notified when a desired lookup service is discovered or discarded, some entities may also wish to be notified when a lookup service experiences changes in its group membership The DiscoveryChangeListener interface defines an extension to the DiscoveryListener interface, providing a mechanism through which an entity may receive these additional notifications referred to as changed events As with the DiscoveryListener interface, when an entity wishes to receive changed events in addition to discovered and discarded events, an implementation of this interface must be provided to the discovery utility being employed It is through that registered listener that the entity receives the desired notifications encapsulated in instances of the DiscoveryEvent class
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The Semantics
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When the entity receives a DiscoveryEvent object through an instance of the DiscoveryChangeListener interface, the event contains the discovered, discarded, or changed registrars, as well as the set of member groups corresponding to each registrar In the case of a changed event, each set of groups referenced in the event contains the new groups in which the corresponding registrar is a member The changed method is called whenever the discovery utility encounters changes in the set of groups in which a previously discovered lookup service is a member It is important to note that instances of this interface are eligible to receive changed events for only those lookup services that the entity has requested be discovered by (at least) group discovery That is, if the entity requests that only locator discovery be used to discover a specific lookup service, the listener will receive no changed events for that lookup service This is because the semantics of this interface assume that since the entity expressed no interest in discovering the lookup service through its group membership, it must also have no interest in any changes in that lookup service's group membership Thus, if an entity wishes to receive changed events for one or more lookup services, the entity must request that those lookup services be discovered by either group discovery alone, or by both group and locator discovery
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