Mercurial > hg > blitz_condensed
annotate examples/statsclient/stats/Lookup.java @ 34:6f68e94c1fb8 default tip
Add CondensedStats monitoring utility, equivalent to vmstat
author | Dominic Cleal <dominic-cleal@cdo2.com> |
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date | Thu, 05 Aug 2010 11:07:25 +0100 |
parents | 3dc0c5604566 |
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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 } |