Mercurial > hg > blitz_stable

annotate src/org/dancres/jini/util/ServiceLocator.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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1 package org.dancres.jini.util;
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2
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3 import net.jini.lookup.entry.Name;
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4 import net.jini.core.entry.Entry;
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5 import net.jini.discovery.DiscoveryListener;
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6 import net.jini.discovery.DiscoveryEvent;
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7 import net.jini.discovery.LookupDiscovery;
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8 import net.jini.core.discovery.LookupLocator;
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9 import net.jini.core.lookup.ServiceRegistrar;
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10 import net.jini.core.lookup.ServiceTemplate;
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11 import java.rmi.RMISecurityManager;
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12 import java.rmi.RemoteException;
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13
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14 /**
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15 * ServiceLoactor is a simple wrapper class over Jini's LookupDiscover.
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16 * It which returns the first matching instance of a service either via
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17 * unicast or multicast discovery
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18 */
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19
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20 public class ServiceLocator{
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21
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22 static {
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23 if (System.getSecurityManager() == null) {
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24 System.setSecurityManager(new RMISecurityManager());
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25 }
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26 }
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27
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28 private Object _proxy;
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29 private Object _lock=new Object();
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30 private ServiceTemplate _template;
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31
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32 /**
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33 * Locates a service via Unicast discovery
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34 * @param lusHost The name of the host where a Jini lookup service is running
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35 * @param serviceClass The class object representing the interface of the service
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36 * @throws MalformedURLException
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37 * @throws IOException
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38 * @throws ClassNotFoundException
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39 * @return The proxy to the discovered service
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40 */
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41 public static Object getService(String lusHost,Class serviceClass)
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42 throws java.net.MalformedURLException,java.io.IOException,ClassNotFoundException{
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43
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44 LookupLocator loc=new LookupLocator("jini://"+lusHost);
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45 ServiceRegistrar reggie=loc.getRegistrar();
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46 ServiceTemplate tmpl=new ServiceTemplate(null, new Class[]{serviceClass},null);
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47 return reggie.lookup(tmpl);
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48
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49 }
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50 /**
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51 *
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52 * @param lusHost
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53 * @param serviceClass
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54 * @param serviceName
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55 * @return proxy or <code>null</code>
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56 * @throws java.net.MalformedURLException
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57 * @throws java.io.IOException
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58 * @throws ClassNotFoundException
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59 */
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60 public static Object getService(String lusHost,Class serviceClass,
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61 String serviceName)
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62 throws java.net.MalformedURLException,java.io.IOException,
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63 ClassNotFoundException{
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64
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65 Class [] types=new Class[]{serviceClass};
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66 Entry [] entry=null;
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67
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68 if(serviceName!=null){
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69 entry=new Entry[]{new Name(serviceName)};
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70 }
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71
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72 ServiceTemplate _template = new ServiceTemplate(null,types,entry);
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73 LookupLocator loc=new LookupLocator("jini://"+lusHost);
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74 ServiceRegistrar reggie=loc.getRegistrar();
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75
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76 return reggie.lookup(_template);
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77 }
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78 /**
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79 * Locates the first matching service via multicast discovery
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80 * @param serviceClass The class object representing the interface of the service
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81 * @throws IOException
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82 * @throws InterruptedException
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83 * @return */
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84 public static Object getService(Class serviceClass)
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85 throws java.io.IOException,InterruptedException{
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86
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87 return getService(serviceClass,null,Long.MAX_VALUE);
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88 }
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89 /**
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90 * Locates the first matching service via multicast discovery
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91 * @param serviceClass The class object representing the interface of the service
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92 * @param waitTime How to wait for the service to be discovered
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93 * @throws IOException
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94 * @throws InterruptedException
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95 * @return */
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96 public static Object getService(Class serviceClass,long waitTime)
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97 throws java.io.IOException,InterruptedException{
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98
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99 return getService(serviceClass,null,waitTime);
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100 }
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101 /**
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102 * Locates the first matching service via multicast discovery
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103 * @param serviceClass The class object representing the interface of the service
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104 * @param serviceName The Name attribute of the service
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105 * @throws IOException
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106 * @throws InterruptedException
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107 * @return */
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108 public static Object getService(Class serviceClass,String serviceName,long waitTime)
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109 throws java.io.IOException,InterruptedException{
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110
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111 ServiceLocator sl=new ServiceLocator();
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112 return sl.getServiceImpl(serviceClass,serviceName,waitTime);
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113 }
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114
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115
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116 private Object getServiceImpl(Class serviceClass,String serviceName,long waitTime)
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117 throws java.io.IOException,InterruptedException{
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118
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119
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120 Class [] types=new Class[]{serviceClass};
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121 Entry [] entry=null;
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122
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123 if(serviceName!=null){
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124 entry=new Entry[]{new Name(serviceName)};
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125 }
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126
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127 _template=new ServiceTemplate(null,types,entry);
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128
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129 LookupDiscovery disco=
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130 new LookupDiscovery(LookupDiscovery.ALL_GROUPS);
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131
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132 disco.addDiscoveryListener(new Listener());
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133
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134
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135
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136 synchronized(_lock){
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137 _lock.wait(waitTime);
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138 }
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139
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140 disco.terminate();
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141 if(_proxy==null){
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142 throw new InterruptedException("Service not found within wait time");
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143 }
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144 return _proxy;
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145
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146 }
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147 class Listener implements DiscoveryListener {
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148 //invoked when a LUS is discovered
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149 public void discovered(DiscoveryEvent ev) {
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150 ServiceRegistrar[] reg = ev.getRegistrars();
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151 for (int i=0 ; i<reg.length && _proxy==null ; i++) {
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152 findService(reg[i]);
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153 }
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154 }
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155
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156 public void discarded(DiscoveryEvent ev) {
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157 }
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158 }
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159 private void findService(ServiceRegistrar lus) {
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160
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161 try {
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162 synchronized(_lock){
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163 _proxy=lus.lookup(_template);
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164 if(_proxy!=null){
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165 _lock.notifyAll();
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166 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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167 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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168 }catch(RemoteException ex) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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169 ex.printStackTrace(System.err);
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170 }
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171 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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172 }