Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/tools/SyncAndShutdown.java @ 0:3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
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0
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1 package org.dancres.blitz.tools; |
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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 import java.rmi.RMISecurityManager; |
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7 |
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8 import net.jini.discovery.*; |
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9 |
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10 import net.jini.lookup.*; |
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11 import net.jini.lookup.entry.Name; |
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12 |
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13 import net.jini.core.lookup.ServiceItem; |
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14 import net.jini.core.lookup.ServiceTemplate; |
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15 |
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16 import net.jini.core.entry.Entry; |
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17 |
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18 import net.jini.admin.Administrable; |
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19 |
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20 import net.jini.space.JavaSpace; |
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21 |
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22 import net.jini.core.transaction.TransactionException; |
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23 |
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24 import org.dancres.blitz.remote.BlitzAdmin; |
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25 |
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26 import org.dancres.jini.util.DiscoveryUtil; |
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27 import org.dancres.jini.util.ServiceLocator; |
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28 |
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29 /** |
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30 <p>SyncAndShutdown accepts a spacename as an argument and attempts to |
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31 shut it down cleanly having sync'd it's contents to disk (this second |
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32 step isn't strictly necessary but does ensure that all state is available |
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33 from the underlying databases without any dependency on the log files). |
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34 This tool will only work with a Blitz JavaSpace owing to it's dependence |
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35 upon the <code>BlitzAdmin</code> interface.</p> |
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36 |
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37 <p>Once a Blitz instance has been shutdown in this manner, one may, for |
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38 example, use <code>DumpEntries</code> to examine it's Entry content.</p> |
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39 |
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40 <p>Typical usage: |
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41 |
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42 <pre> |
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43 java -Xmx256m -Djava.security.policy=config/policy.all |
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44 -classpath /home/dan/jini/jini2_0/lib/jsk-platform.jar:/home/dan/src/jini/space/build:/home/dan/jini/jini2_0/lib/jini-ext.jar:/home/dan/jini/jini2_0/lib/sun-util.jar |
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45 org.dancres.blitz.tools.SyncAndShutdown dancres |
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46 </pre> |
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47 |
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48 <p>This tool is non-destructive so it's perfectly possible to shut a |
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49 Blitz instance down, run <code>DumpEntries</code> and then restart the |
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50 space.</p> |
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51 |
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52 <p>Note if there are active transactions, Blitz will by default refuse |
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53 to honour the request. You can force Blitz to shutdown by adding |
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54 <code>-Dforce=true</code> to the command-line(s) above.</p> |
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55 |
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56 @see org.dancres.blitz.remote.BlitzAdmin |
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57 @see org.dancres.blitz.tools.DumpEntries |
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58 */ |
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59 public class SyncAndShutdown { |
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60 private static final long MAX_DISCOVER_TIME = 15 * 1000; |
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61 |
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62 public static void main(String args[]) { |
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63 if (System.getSecurityManager() == null) |
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64 System.setSecurityManager(new RMISecurityManager()); |
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65 |
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66 boolean amForced = Boolean.getBoolean("force"); |
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67 |
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68 try { |
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69 try { |
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70 Object myProxy = null; |
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71 |
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72 if (args.length == 1) |
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73 myProxy = ServiceLocator.getService(JavaSpace.class, |
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74 args[0], |
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75 MAX_DISCOVER_TIME); |
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76 else if (args.length == 2) { |
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77 myProxy = ServiceLocator.getService(args[0], |
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78 JavaSpace.class, |
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79 args[1]); |
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80 } else { |
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81 System.err.println("Wrong number of arguments - should be <spacename> or <LUS host> <spacename>"); |
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82 System.exit(-1); |
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83 } |
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84 |
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85 if (myProxy != null) { |
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86 System.err.println("Found space: " + myProxy); |
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87 |
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88 DiscoveryUtil.dumpInterfaces(myProxy.getClass()); |
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89 |
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90 if (DiscoveryUtil.hasInterface(myProxy, |
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91 Administrable.class)) { |
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92 Administrable myAdmin = (Administrable) myProxy; |
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93 |
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94 Object myAdminProxy = myAdmin.getAdmin(); |
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95 |
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96 DiscoveryUtil.dumpInterfaces(myAdminProxy.getClass()); |
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97 |
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98 if (DiscoveryUtil.hasInterface(myAdminProxy, |
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99 BlitzAdmin.class)) { |
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100 BlitzAdmin myBlitzAdmin = |
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101 (BlitzAdmin) myAdminProxy; |
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102 |
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103 try { |
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104 System.err.println("Invoking checkpoint"); |
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105 myBlitzAdmin.requestSnapshot(); |
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106 } catch (TransactionException aTE) { |
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107 System.err.println("Failed to checkpoint"); |
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108 aTE.printStackTrace(System.err); |
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109 |
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110 if (amForced) { |
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111 System.err.println("Ignoring checkpoint " + |
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112 "failure and forcing shutdown"); |
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113 } else { |
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114 System.exit(-1); |
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115 } |
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116 } |
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117 |
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118 System.err.println("Invoking shutdown"); |
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119 myBlitzAdmin.shutdown(); |
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120 } else { |
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121 System.err.println("No BlitzAdmin interface found - can't be Blitz"); |
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122 } |
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123 } else { |
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124 System.err.println("No admin interface present - can't be Blitz"); |
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125 } |
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126 } |
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127 } catch (InterruptedException anIE) { |
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128 System.err.println("!!! Whoops service not found :( !!!"); |
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129 } |
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130 } catch (ClassNotFoundException aCNFE) { |
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131 System.err.println("ClassNotFound exception"); |
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132 aCNFE.printStackTrace(System.err); |
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133 } catch (RemoteException anRE) { |
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134 System.err.println("Remote exception"); |
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135 anRE.printStackTrace(System.err); |
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136 } catch (IOException anIOE) { |
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137 System.err.println("Failed to configure discovery"); |
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138 anIOE.printStackTrace(System.err); |
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139 } |
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140 } |
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141 } |