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CHAPTER 17 SERVICEDISCOVERYMANAGER
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System.out.println(type.toString()); } } } // ImmediateClientLookup
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An example in 15 discussed how to select a printer with a speed greater than a certain value. This type of problem is well suited to the ServiceDiscoveryManager using a ServiceItemFilter. The ServiceItemFilter interface has a check() method, which is called on the client side to perform additional filtering of services. This method can accept or reject a service based on criteria supplied by the client. The following program illustrates how this check() method can be used to select only printer services with a speed of greater than 24 pages per minute. package client; import common.Printer; import java.rmi.RMISecurityManager; import net.jini.discovery.LookupDiscovery; import net.jini.core.lookup.ServiceTemplate; import net.jini.discovery.LookupDiscoveryManager; import net.jini.lookup.ServiceDiscoveryManager; import net.jini.core.lookup.ServiceItem; import net.jini.lease.LeaseRenewalManager; import net.jini.lookup.ServiceItemFilter; /** * TestPrinterSpeedFilter.java */ public class TestPrinterSpeedFilter implements ServiceItemFilter { private static final long WAITFOR = 100000L; public TestPrinterSpeedFilter() { ServiceDiscoveryManager clientMgr = null; System.setSecurityManager(new RMISecurityManager()); try { LookupDiscoveryManager mgr = new LookupDiscoveryManager(LookupDiscovery.ALL_GROUPS, null, // unicast locators null); // DiscoveryListener clientMgr = new ServiceDiscoveryManager(mgr, new LeaseRenewalManager()); } catch(Exception e) { e.printStackTrace(); System.exit(1); } Class[] classes = new Class[] {Printer.class};
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CHAPTER 17 SERVICEDISCOVERYMANAGER
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ServiceTemplate template = new ServiceTemplate(null, classes, null); ServiceItem item = null; try { item = clientMgr.lookup(template, this, // filter WAITFOR); // timeout } catch(Exception e) { e.printStackTrace(); System.exit(1); } if (item == null) { // couldn't find a service in time System.exit(1); } Printer printer = (Printer) item.service; // Now use the printer // ... } public boolean check(ServiceItem item) { // This is the filter Printer printer = (Printer) item.service; if (printer.getSpeed() > 24) { return true; } else { return false; } } public static void main(String[] args) { TestPrinterSpeed f = new TestPrinterSpeed(); // stay around long enough to receive replies try { Thread.currentThread().sleep(2*WAITFOR); } catch(java.lang.InterruptedException e) { // do nothing } } } // TestPrinterSpeed
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Building a Cache of Services
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A client may wish to make use of a service multiple times. If the client simply found a suitable reference to a service, then before each use it would have to check that the reference was still valid, and if not, it would need to find another one. The client may also want to use minor variants of a service, such as a fast printer one time and a slow one the next. While this management can be done easily enough in each case, the ServiceDiscoveryManager can supply a cache of
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CHAPTER 17 SERVICEDISCOVERYMANAGER
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services that will do this work for you. This cache will monitor lookup services to keep the cache as up to date as possible. The cache is defined as an interface: package net.jini.lookup; public interface LookupCache { public ServiceItem lookup(ServiceItemFilter filter); public ServiceItem[] lookup(ServiceItemFilter filter, int maxMatches); public void addListener(ServiceDiscoveryListener l); public void removeListener(ServiceDiscoveryListener l); public void discard(Object serviceReference); void terminate(); } A suitable implementation object can be created by the ServiceDiscoveryManager method: LookupCache createLookupCache(ServiceTemplate tmpl, ServiceItemFilter filter, ServiceDiscoveryListener listener); We will ignore the ServiceDiscoveryListener until the next section of this chapter. It can be set to null in createLookupCache(). The LookupCache created by createLookupCache() takes a template for matching against interface and entry attributes. It also takes a filter to perform additional client-side Boolean filtering of services. The cache will then maintain a set of references to services matching the template and passing the filter. These references are all local to the client and consist of the service proxies and their attributes downloaded to the client. Searching for a service can then be done by local methods: LookupCache.lookup(). These can take an additional filter that can be used to further refine the set of services returned to the client. The search in the cache is done directly on the proxy services and attributes already found by the client, and it does not involve querying lookup services. Essentially, this involves a tradeoff of lookup service activity while the client is idle to produce fast local response when the client is active. There are versions of ServiceDiscoveryManager.lookup() with a time parameter, which block until a service is found or the method times out. These methods do not use polling, but instead use event notification because they are trying to find services based on remote calls to lookup services. The lookup() methods of LookupCache do not implement such a blocking call because the methods run purely locally, and it is reasonable to poll the cache for a short time if need be. Here is a version of the file classifier client that creates and examines the cache for suitable service: package client; import common.FileClassifier; import common.MIMEType; import java.rmi.RMISecurityManager; import net.jini.discovery.LookupDiscovery;
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