Mercurial > hg > blitz_stable

annotate src/org/dancres/blitz/tools/SyncAndShutdown.java @ 0:3dc0c5604566

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Initial checkin of blitz 2.0 fcs - no installer yet.
author Dan Creswell <dan.creswell@gmail.com>
date Sat, 21 Mar 2009 11:00:06 +0000
parents
children
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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");
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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132 aCNFE.printStackTrace(System.err);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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133 } catch (RemoteException anRE) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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134 System.err.println("Remote exception");
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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135 anRE.printStackTrace(System.err);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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136 } catch (IOException anIOE) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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137 System.err.println("Failed to configure discovery");
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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138 anIOE.printStackTrace(System.err);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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139 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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140 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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141 }