SD2 The ServiceDiscoveryManager in Java

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netjinicorelookupServiceMatches netjinicorelookupServiceRegistrar netjinicorelookupServiceTemplate netjinidiscoveryDiscoveryListener netjinidiscoveryDiscoveryManagement netjinidiscoveryLookupDiscoveryManager netjinileaseLeaseRenewalManager netjinilookupLookupCache netjinilookupServiceDiscoveryEvent netjinilookupServiceDiscoveryListener netjinilookupServiceItemFilter javaioIOException javarmiserverUnicastRemoteObject javarmiMarshalledObject javarmiRemoteException javautilEventListener javautilEventObject javautilSet
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SD2 The ServiceDiscoveryManager
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Section: SD Jini Service Discovery Utilities Specification
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The public interface provided by the ServiceDiscoveryManager class defines methods that allow an entity to request that references to services matching criteria defined by the entity be found in discovered lookup services and cached for local retrieval This interface also defines methods for retrieving the manager objects employed by this utility, and for performing termination processing
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package netjinilookup; public class ServiceDiscoveryManager { public ServiceDiscoveryManager (DiscoveryManagement discoveryMgr, LeaseRenewalManager leaseMgr) throws IOException {} public LookupCache createLookupCache (ServiceTemplate tmpl, ServiceItemFilter filter, ServiceDiscoveryListener listener) throws RemoteException {} public ServiceItem lookup(ServiceTemplate tmpl, ServiceItemFilter filter) {} public ServiceItem lookup(ServiceTemplate tmpl, ServiceItemFilter filter, long waitDur) throws InterruptedException, RemoteException {} public ServiceItem[] lookup (ServiceTemplate tmpl, int maxMatches, ServiceItemFilter filter) {} public ServiceItem[] lookup(ServiceTemplate tmpl, int minMatches, int maxMatches, ServiceItemFilter filter, long waitDur) throws InterruptedException, RemoteException {} public DiscoveryManagement getDiscoveryManager() {} public LeaseRenewalManager getLeaseRenewalManager() {} public void terminate() {} }
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Section: SD Jini Service Discovery Utilities Specification
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The ServiceDiscoveryManager makes certain concurrency guarantees with respect to the methods it defines When a method of ServiceDiscoveryManager invokes a remote method, although such an invocation may block other remote calls made in the ServiceDiscoveryManager, invocations of local methods will not be blocked SD41 The Methods The ServiceDiscoveryManager helper utility class defines a number of public methods in addition to its constructor This utility defines a factory method that allows the entity to create a local cache for storing references to desired services that have been previously discovered Additionally, this class defines a set of methods that the entity may use to query (remotely) each discovered lookup service for other services that are of interest to the entity The equals method for the ServiceDiscoveryManager class returns true if and only if two instances of this class refer to the same object That is, x and y are equal instances of this class if and only if x==y has the value true
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SD411 The Constructor
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The constructor of the ServiceDiscoveryManager takes two arguments: an object that implements the DiscoveryManagement interface and a reference to a LeaseRenewalManager object The constructor throws an IOException because construction of a ServiceDiscoveryManager may initiate the multicast discovery process, a process that can throw IOException To use the ServiceDiscoveryManager, an entity supplies an object through which notifications that indicate a lookup service has been discovered or discarded will be received At a minimum, this object must satisfy the contract defined in the DiscoveryManagement interface That is, this object must provide the ServiceDiscoveryManager with the ability to set discovery listeners and to discard previously discovered lookup services when they are found to be unavailable A value of null may be passed as the DiscoveryManagement argument If the value of the argument is null, an instance of the LookupDiscoveryManager utility class will be constructed to discover only those lookup services that are members of the public group A value of null may be passed as the LeaseRenewalManager argument If the value of the argument is null, an instance of the LeaseRenewalManager class will be created, initially managing no Lease objects
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SD412 The createLookupCache Method
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The createLookupCache method allows an entity to request that the ServiceDiscoveryManager create a new managed set (or cache) and populate it with services, which match criteria defined by the entity, and whose references are registered with one or more of the lookup services the entity has targeted for discovery This method returns an object of type LookupCache Through this return value, the entity can query the cache for services of interest, manage the cache's event mechanism for service discoveries, or SD4 The Semantics 229
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O'Reilly Network Safari Bookshelf Jini Specifications, The, Second Edition terminate the cache The definition of the LookupCache interface is presented later in this specification An entity typically uses the object returned by this method to provide local storage of, and access to, references to services that it is interested in using Entities that need frequent access to numerous services will find the object returned by this method quite useful because acquisition of those service references is provided through local method invocations Additionally, because the object returned by this method provides an event mechanism, it is also useful to entities wishing to simply monitor, in an event driven manner, the state changes that occur in the services of interest The createLookupCache method takes three arguments: an instance of ServiceTemplate, an instance of ServiceItemFilter, and an instance of ServiceDiscoveryListener Both the interfaces ServiceItemFilter and ServiceDiscoveryListener are presented later in this chapter Together, the tmpl and the filter arguments define the criteria with which service matching should be performed The listener argument references an object that will receive notifications when services matching the input criteria are discovered for the first time, or have encountered a state change such as removal from all lookup services or attribute set changes If null is input to the listener argument for a particular invocation of this method, the cache resulting from that invocation will send no such notifications The tmpl argument employs template matching semantics that are identical to the semantics described in The Jini Technology Core Platform Specification, "ServiceTemplate and Item Matching") to identify the service(s) to acquire from lookup services in the managed set The object passed to the filter argument is then used to apply additional matching criteria to any service references found through template matching The additional matching criteria defined by the filter parameter are application specific, and therefore must be defined by the client like entity itself (as described in Section SD52, "The ServiceItemFilter Interface") Furthermore, once an instance of the cache is created, the filter associated with that instance will not change during the life of that particular cache If the filter is changed so that its original behavior is modified, the effect on the cache is undefined As a convenience, a null reference input to the tmpl argument is treated as equivalent to inputting a ServiceTemplate constructed with all null arguments (all wildcards) That is, the cache will attempt to discover all services contained in each lookup service in the managed set If a null value is passed as the filter argument, then only template matching will be employed to find the desired services Entities that invoke this method must take care not to modify the contents of the object input through the tmpl parameter after the cache has been created Doing so could cause the state of the cache to become corrupted or inconsistent It is for this reason that the effects of modifying the contents of the tmpl parameter, after this method is invoked, are undefined
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