Mercurial > hg > blitz_stable

annotate examples/statsclient/stats/Lookup.java @ 18:4580bb12db30

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Separate command execution from command logging.
author Dan Creswell <dan.creswell@gmail.com>
date Sun, 05 Jul 2009 16:26:25 +0100
parents 3dc0c5604566
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
0
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1 package stats;
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2
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3 import java.io.IOException;
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4
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5 import java.rmi.RemoteException;
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6
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7 import net.jini.core.lookup.ServiceRegistrar;
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8 import net.jini.core.lookup.ServiceTemplate;
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9
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10 import net.jini.discovery.LookupDiscovery;
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11 import net.jini.discovery.DiscoveryListener;
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12 import net.jini.discovery.DiscoveryEvent;
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13
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14 /**
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15 A class which supports a simple JINI multicast lookup. It doesn't register
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16 with any ServiceRegistrars it simply interrogates each one that's
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17 discovered for a ServiceItem associated with the passed interface class.
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18 i.e. The service needs to already have registered because we won't notice
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19 new arrivals. [ServiceRegistrar is the interface implemented by JINI
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20 lookup services].
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21
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22 @todo Be more dynamic in our lookups - see above
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23
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24 @author Dan Creswell (dan@dancres.org)
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25 @version 1.00, 7/9/2003
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26 */
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27 class Lookup implements DiscoveryListener {
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28 private ServiceTemplate theTemplate;
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29 private LookupDiscovery theDiscoverer;
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30
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31 private Object theProxy;
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32
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33 /**
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34 @param aServiceInterface the class of the type of service you are
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35 looking for. Class is usually an interface class.
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36 */
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37 Lookup(Class aServiceInterface) {
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38 Class[] myServiceTypes = new Class[] {aServiceInterface};
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39 theTemplate = new ServiceTemplate(null, myServiceTypes, null);
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40 }
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41
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42 /**
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43 Having created a Lookup (which means it now knows what type of service
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44 you require), invoke this method to attempt to locate a service
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45 of that type. The result should be cast to the interface of the
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46 service you originally specified to the constructor.
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47
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48 @return proxy for the service type you requested - could be an rmi
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49 stub or an intelligent proxy.
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50 */
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51 Object getService() {
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52 synchronized(this) {
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53 if (theDiscoverer == null) {
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54
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55 try {
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56 theDiscoverer =
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57 new LookupDiscovery(LookupDiscovery.ALL_GROUPS);
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58 theDiscoverer.addDiscoveryListener(this);
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59 } catch (IOException anIOE) {
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60 System.err.println("Failed to init lookup");
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61 anIOE.printStackTrace(System.err);
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62 }
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63 }
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64 }
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65
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66 return waitForProxy();
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67 }
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68
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69 /**
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70 Location of a service causes the creation of some threads. Call this
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71 method to shut those threads down either before exiting or after a
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72 proxy has been returned from getService().
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73 */
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74 void terminate() {
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75 synchronized(this) {
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76 if (theDiscoverer != null)
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77 theDiscoverer.terminate();
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78 }
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79 }
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80
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81 /**
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82 Caller of getService ends up here, blocked until we find a proxy.
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83
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84 @return the newly downloaded proxy
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85 */
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86 private Object waitForProxy() {
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87 synchronized(this) {
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88 while (theProxy == null) {
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89
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90 try {
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91 wait();
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92 } catch (InterruptedException anIE) {
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93 }
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94 }
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95
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96 return theProxy;
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97 }
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98 }
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99
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100 /**
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101 Invoked to inform a blocked client waiting in waitForProxy that
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102 one is now available.
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103
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104 @param aProxy the newly downloaded proxy
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105 */
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106 private void signalGotProxy(Object aProxy) {
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107 synchronized(this) {
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108 if (theProxy == null) {
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109 theProxy = aProxy;
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110 notify();
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111 }
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112 }
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113 }
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114
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115 /**
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116 Everytime a new ServiceRegistrar is found, we will be called back on
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117 this interface with a reference to it. We then ask it for a service
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118 instance of the type specified in our constructor.
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119 */
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120 public void discovered(DiscoveryEvent anEvent) {
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121 synchronized(this) {
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122 if (theProxy != null)
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123 return;
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124 }
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125
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126 ServiceRegistrar[] myRegs = anEvent.getRegistrars();
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127
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128 for (int i = 0; i < myRegs.length; i++) {
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129 ServiceRegistrar myReg = myRegs[i];
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130
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131 Object myProxy = null;
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132
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133 try {
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134 myProxy = myReg.lookup(theTemplate);
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135
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136 if (myProxy != null) {
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137 signalGotProxy(myProxy);
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138 break;
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139 }
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140 } catch (RemoteException anRE) {
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141 System.err.println("ServiceRegistrar barfed");
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142 anRE.printStackTrace(System.err);
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143 }
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144 }
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145 }
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146
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147 /**
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148 When a ServiceRegistrar "disappears" due to network partition etc.
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149 we will be advised via a call to this method - as we only care about
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150 new ServiceRegistrars, we do nothing here.
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151 */
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152 public void discarded(DiscoveryEvent anEvent) {
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153 }
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154 }