Mercurial > hg > blitz_condensed
annotate src/org/dancres/jini/util/ServiceLocator.java @ 28:4b2f23b6feca
Add a schema compatibility check to indexer that parallels storage.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 12 Jun 2010 10:11:15 +0100 |
parents | 3dc0c5604566 |
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0
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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 } |
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167 } |
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168 }catch(RemoteException ex) { |
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169 ex.printStackTrace(System.err); |
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170 } |
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171 } |
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172 } |