DU2 The Discovery Management Interfaces in Java

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DU2 The Discovery Management Interfaces
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O'Reilly Network Safari Bookshelf Jini Specifications, The, Second Edition A specific example of a class that implements only a subset of the set of interfaces specified here is the LookupDiscovery utility class defined later in this specification That class implements both the DiscoveryManagement and DiscoveryGroupManagement interfaces, but not the DiscoveryLocatorManagement interface Throughout this discussion of the discovery management interfaces, the phrase implementation class refers to any concrete class that implements one or more of those interfaces The phrase implementation object should be understood to mean an instance of such an implementation class Additionally, whenever a description refers to the discovering entity (or simply, the entity), that phrase is intended to be interpreted as the object (the client or service) that has created an implementation object, and which wishes to use the public methods specified by these interfaces and provided by that object DU22 Other Types The types defined in the specification of the discovery management interfaces are in the netjinidiscovery package The following additional types may also be referenced in this specification Whenever referenced, these object types will be referenced in unqualified form:
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netjinicorediscoveryLookupLocator netjinicorelookupServiceRegistrar netjinidiscoveryDiscoveryEvent netjinidiscoveryDiscoveryListener netjinidiscoveryDiscoveryChangeListener netjinidiscoveryLookupDiscovery netjinidiscoveryLookupDiscoveryManager javaioIOException javasecurityPermission javautilEventListener javautilEventObject javautilMap
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DU23 The DiscoveryManagement Interface The public methods specified by the DiscoveryManagement interface are:
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package netjinidiscovery; public interface DiscoveryManagement { public void addDiscoveryListener (DiscoveryListener listener); public void removeDiscoveryListener (DiscoveryListener listener); public ServiceRegistrar[] getRegistrars(); public void discard(ServiceRegistrar proxy); public void terminate(); }
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The DiscoveryManagement interface defines methods related to the discovery event mechanism and discovery process termination Through this interface, an entity can register or un register DiscoveryListener objects to receive discovery events (instances of DiscoveryEvent), retrieve proxies to the currently discovered lookup services, discard a lookup service so that it is eligible for re discovery, or terminate the discovery process Implementation classes of this interface may impose additional semantics on any method For example, such a class may choose to require that rather than simply terminate discovery processing, the terminate method additionally should cancel all leases held by the implementation object and terminate all lease management being performed on behalf of the entity
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DU2 The Discovery Management Interfaces
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O'Reilly Network Safari Bookshelf Jini Specifications, The, Second Edition For information on any additional semantics imposed on a method of this interface, refer to the specification of the particular implementation class The DiscoveryEvent, DiscoveryListener, and DiscoveryChangeListener classes are defined later in this specification The addDiscoveryListener method adds a listener to the set of objects listening for discovery events This method takes a single argument as input: an instance of DiscoveryListener corresponding to the listener to add to the set Once a listener is registered, it will be notified of all lookup services discovered to date, and will then be notified as new lookup services are discovered or existing lookup services are discarded If the added listener is also an instance of DiscoveryChangeListener (a subclass of DiscoveryListener), then in addition to receiving events related to discovered and discarded lookup services, that listener will also be notified of group membership changes that occur in any of the lookup services targeted for at least group discovery If null is input to this method, a NullPointerException is thrown If the listener input to this method duplicates (using the equals method) another element in the set of listeners, no action is taken Implementations of the DiscoveryManagement interface must guarantee reentrancy with respect to DiscoveryListener objects registered through this method Should the instance of DiscoveryManagement invoke a method on a registered listener (a local call), calls from that method to any method of the DiscoveryManagement instance are guaranteed not to result in a deadlock condition The removeDiscoveryListener method removes a listener from the set of objects listening for discovery events This method takes a single argument as input: an instance of DiscoveryListener corresponding to the listener to remove from the set If the listener object input to this method does not exist in the set of listeners maintained by the implementation class, then this method will take no action The getRegistrars method returns an array consisting of instances of the ServiceRegistrar interface Each element in the returned set is a proxy to one of the currently discovered lookup services Each time this method is invoked, a new array is returned If no lookup services have been discovered, an empty array is returned This method takes no arguments as input The discard method removes a particular lookup service from the managed set of lookup services, and makes that lookup service eligible to be re discovered This method takes a single argument as input: an instance of the ServiceRegistrar interface corresponding to the proxy to the lookup service to discard If the proxy input to this method is null, or if it matches (using the equals method) none of the lookup services in the managed set, this method takes no action Currently, there exist utilities such as the LookupDiscovery and LookupDiscoveryManager helper utilities that will, on behalf of a discovering entity, automatically discard a lookup service upon determining that the lookup service has become unreachable or uninteresting Although most entities will typically employ such a utility to help with both its discovery as well as its discard duties, it is important to note that if the entity itself determines that the lookup service is unavailable, it is the responsibility of the entity to invoke the discard method This scenario usually happens when the entity attempts to interact with a lookup service, but encounters an exceptional condition (for example, a communication failure) When the entity actively discards a lookup service, the discarded lookup service becomes eligible to be re discovered Allowing unreachable lookup services to remain in the managed set can result in repeated and unnecessary attempts to interact with lookup services with which the entity can no longer communicate Thus, the mechanism provided by this method is intended to DU2 The Discovery Management Interfaces 169
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O'Reilly Network Safari Bookshelf Jini Specifications, The, Second Edition provide a way to remove such "stale" lookup service references from the managed set Invoking the discard method defined by the DiscoveryManagement interface will result in the flushing of the lookup service from the appropriate cache, ultimately causing a discard notification referred to as a discarded event to be sent to all listeners registered with the implementation object When this method completes successfully, the lookup service is guaranteed to have been removed from the managed set, and the lookup service is then said to have been "discarded" No such guarantee is made with respect to when the discarded event is sent to the registered listeners That is, the event notifying the listeners that the lookup service has been discarded may or may not be sent asynchronously The terminate method ends all discovery processing being performed on behalf of the entity This method takes no input arguments After this method has been invoked, no new lookup services will be discovered, and the effect of any new operations performed on the current implementation object are undefined Any additional termination semantics must be defined by the implementation class DU24 The DiscoveryGroupManagement Interface The public methods specified by the DiscoveryGroupManagement interface are as follows:
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package netjinidiscovery; public interface DiscoveryGroupManagement { public static final String[] ALL_GROUPS = null; public static final String[] NO_GROUPS = new String[0]; public public public public } String[] getGroups(); void addGroups(String[] groups) throws IOException; void setGroups(String[] groups) throws IOException; void removeGroups(String[] groups);
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