Mercurial > hg > blitz_stable

annotate src/org/dancres/jini/tools/DumpRegistry.java @ 32:243c74d599bf

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author Dan Creswell <dan.creswell@gmail.com>
date Sat, 12 Jun 2010 10:41:47 +0100
parents 3dc0c5604566
children
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0
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1 package org.dancres.jini.tools;
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2
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3 import net.jini.core.discovery.LookupLocator;
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4 import net.jini.core.lookup.ServiceRegistrar;
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5 import net.jini.discovery.DiscoveryEvent;
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6 import net.jini.discovery.DiscoveryListener;
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7 import net.jini.discovery.LookupDiscovery;
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8 import net.jini.discovery.LookupDiscoveryManager;
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9
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10 import org.dancres.jini.util.DiscoveryUtil;
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11
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12 import java.io.IOException;
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13 import java.rmi.RMISecurityManager;
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14 import java.rmi.RemoteException;
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15 import java.util.ArrayList;
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16
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17 /**
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18 This is an example of a simple lookup via multicast. It gets of rid of
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19 the need to be aware of static lookup information because we can "discover"
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20 lookup services dynamically at startup. This basic implementation has
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21 one fault which is that it only scans each LookupService it finds once
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22 for service matches (see the comments in DiscoveryListenerImpl). We could
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23 go to the trouble of fixing this all ourselves but there's an easier way -
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24 ServiceDiscoveryManager.
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25 */
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26 public class DumpRegistry {
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27 public static void main(String args[]) throws Exception {
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28 /*
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29 Gotta do this to enable remote class downloading
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30 */
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31 System.setSecurityManager(new RMISecurityManager());
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32
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33 /*
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34 We're going to look for all ServiceRegistrar instances in all
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35 groups - everything we can find via a multicast
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36 */
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37 String[] myGroups = LookupDiscovery.ALL_GROUPS;
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38 LookupLocator[] myLocators = new LookupLocator[0];
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39
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40 if (args.length != 0) {
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41 ArrayList mySpecGroups = new ArrayList();
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42 ArrayList mySpecLocs = new ArrayList();
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43
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44 for (int i = 0; i < args.length; i++) {
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45 if (args[i].startsWith("jini:")) {
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46 mySpecLocs.add(new LookupLocator(args[i]));
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47 } else {
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48 mySpecGroups.add(args[i]);
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49 }
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50 }
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51
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52 myGroups = new String[mySpecGroups.size()];
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53 myGroups = (String[]) mySpecGroups.toArray(myGroups);
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54
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55 myLocators = new LookupLocator[mySpecLocs.size()];
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56 myLocators = (LookupLocator[]) mySpecLocs.toArray(myLocators);
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57 }
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58
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59 try {
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60 LookupDiscoveryManager myDiscovery =
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61 new LookupDiscoveryManager(myGroups, myLocators,
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62 new DiscoveryListenerImpl());
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63 } catch (IOException anIOE) {
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64 System.err.println("Couldn't setup LookupDiscovery - exiting");
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65 anIOE.printStackTrace(System.err);
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66 System.exit(-1);
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67 }
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68
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69 /*
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70 The thing we need to remember about this kind of discovery is
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71 that things take *time*. Locating a ServiceRegistrar doesn't happen
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72 immediately and is actually being done *asynchronously* (on another
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73 thread). So, we wait a while or, in this case, forever. Note
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74 that, depending on implementation, this might not be necessary.
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75 It may be enough to have an active LookupDiscovery instance if it
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76 uses normal threads. However, we assume it uses all daemon threads.
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77 */
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78 try {
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79 Object myLock = new Object();
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80
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81 synchronized(myLock) {
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82 myLock.wait(0);
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83 }
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84 } catch (InterruptedException anIE) {
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85 System.err.println("Whoops main thread interrupted");
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86 }
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87 }
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88
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89 private static class DiscoveryListenerImpl implements DiscoveryListener {
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90 public void discarded(DiscoveryEvent anEvent) {
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91 // We don't care about these
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92 }
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93
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94 public void discovered(DiscoveryEvent anEvent) {
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95 ServiceRegistrar[] myRegs = anEvent.getRegistrars();
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96
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97 for (int i = 0; i < myRegs.length; i++) {
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98
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99 try {
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100 ServiceRegistrar myRegistrar = myRegs[i];
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101
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102 if (myRegistrar != null) {
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103 System.out.println("Found registrar:");
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104
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105 DiscoveryUtil.dumpRegistrar(myRegistrar);
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106
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107 DiscoveryUtil.dumpContents(myRegistrar);
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108 }
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109
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110 } catch (RemoteException aRE) {
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111 System.err.println("Couldn't talk to ServiceRegistrar");
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112 aRE.printStackTrace(System.err);
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113 } catch (IOException anIOE) {
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114 System.err.println("Whoops couldn't talk to ServiceRegistrar");
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115 anIOE.printStackTrace(System.err);
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116 }
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117 }
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118 }
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119 }
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120 }