Mercurial > hg > blitz_stable

annotate src/org/dancres/blitz/remote/nio/CommandFactory.java @ 35:6f68e94c1fb8 default tip

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Add CondensedStats monitoring utility, equivalent to vmstat
author Dominic Cleal <dominic-cleal@cdo2.com>
date Thu, 05 Aug 2010 11:07:25 +0100
parents 3dc0c5604566
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
0
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1 package org.dancres.blitz.remote.nio;
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2
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3 import org.dancres.blitz.mangler.MangledEntry;
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4 import org.dancres.io.AnnotatingObjectOutputStream;
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5 import org.dancres.io.AnnotatingObjectInputStream;
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6 import net.jini.core.transaction.Transaction;
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7 import net.jini.core.transaction.server.TransactionManager;
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8
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9 import java.io.*;
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10
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11 /**
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12 * Yields a space operation that can be rendered into a byte array for
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13 * passing across to the server over a socket. Also performs the conversion
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14 * in the other direction
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15 */
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16 public class CommandFactory {
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17 public Operation newWrite(MangledEntry anEntry, Transaction aTxn,
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18 long aLease) {
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19 return new GenericSpaceOp(GenericSpaceOp.WRITE, anEntry, aTxn, aLease);
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20 }
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21
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22 public Operation newRead(MangledEntry anEntry, Transaction aTxn,
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23 long aWaitTime) {
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24 return new GenericSpaceOp(GenericSpaceOp.READ, anEntry, aTxn, aWaitTime);
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25 }
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26
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27 public Operation newTake(MangledEntry anEntry, Transaction aTxn,
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28 long aWaitTime) {
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29 return new GenericSpaceOp(GenericSpaceOp.TAKE, anEntry, aTxn, aWaitTime);
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30 }
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31
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32 public Operation newReadExists(MangledEntry anEntry, Transaction aTxn,
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33 long aWaitTime) {
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34 return new GenericSpaceOp(GenericSpaceOp.READ_EXISTS, anEntry, aTxn, aWaitTime);
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35 }
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36
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37 public Operation newTakeExists(MangledEntry anEntry, Transaction aTxn,
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38 long aWaitTime) {
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39 return new GenericSpaceOp(GenericSpaceOp.TAKE_EXISTS, anEntry, aTxn, aWaitTime);
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40 }
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41
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42 public Operation newPrepare(TransactionManager aMgr, long anId) {
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43 return new TransactionOp(TransactionOp.PREPARE, aMgr, anId);
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44 }
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45
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46 public Operation newAbort(TransactionManager aMgr, long anId) {
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47 return new TransactionOp(TransactionOp.ABORT, aMgr, anId);
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48 }
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49
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50 public Operation newCommit(TransactionManager aMgr, long anId) {
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51 return new TransactionOp(TransactionOp.COMMIT, aMgr, anId);
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52 }
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53
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54 public Operation newPrepareCommit(TransactionManager aMgr, long anId) {
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55 return new TransactionOp(TransactionOp.PREPARE_COMMIT, aMgr, anId);
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56 }
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57
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58 public byte[] pack(Operation anOp) throws IOException {
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59 ByteArrayOutputStream myBAOS = new ByteArrayOutputStream();
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60
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61 if (anOp instanceof GenericSpaceOp) {
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62 GenericSpaceOp myOp = (GenericSpaceOp) anOp;
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63
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64 myBAOS.write(myOp.getOperation());
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65
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66 AnnotatingObjectOutputStream myOOS =
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67 new AnnotatingObjectOutputStream(myBAOS, myBAOS);
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68
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69 myOOS.writeObject(myOp.getEntry());
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70 myOOS.writeObject(myOp.getTxn());
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71 myOOS.writeLong(myOp.getLease());
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72
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73 myOOS.close();
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74 } else if (anOp instanceof TransactionOp) {
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75 TransactionOp myOp = (TransactionOp) anOp;
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76
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77 myBAOS.write(myOp.getOperation());
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78
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79 AnnotatingObjectOutputStream myOOS =
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80 new AnnotatingObjectOutputStream(myBAOS, myBAOS);
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81
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82 myOOS.writeObject(myOp.getMgr());
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83 myOOS.writeLong(myOp.getId());
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84
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85 myOOS.close();
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86 } else
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87 throw new IOException("Don't know how to marshal: " +
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88 anOp.getClass());
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89
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90 byte[] myResult = myBAOS.toByteArray();
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91
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92 // System.err.println("Pack hash: " + hash(myResult));
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93
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94 return myResult;
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95 }
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96
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97 private int hash(byte[] anArray) {
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98 int myHash = 0;
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99
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100 for (int i = 0; i < anArray.length; i++) {
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101 myHash += anArray[i];
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102 myHash += (myHash << 10);
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103 myHash ^= (myHash >> 6);
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104 }
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105
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106 myHash += (myHash << 3);
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107 myHash ^= (myHash >> 11);
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108 myHash += (myHash << 15);
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109
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110 return myHash;
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111 }
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112
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113 public Operation unpack(byte[] aFlattenedOp) throws IOException {
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114
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115 // System.err.println("Unpack hash: " + hash(aFlattenedOp));
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116
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117 ByteArrayInputStream myBAIS = new ByteArrayInputStream(aFlattenedOp);
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118
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119 int myOpCode = myBAIS.read();
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120
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121 switch (myOpCode) {
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122 case GenericSpaceOp.WRITE :
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123 case GenericSpaceOp.TAKE_EXISTS :
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124 case GenericSpaceOp.READ_EXISTS :
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125 case GenericSpaceOp.TAKE :
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126 case GenericSpaceOp.READ : {
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127
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128 try {
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129 AnnotatingObjectInputStream myOIS =
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130 new AnnotatingObjectInputStream(null, myBAIS,
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131 myBAIS, false);
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132
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133 MangledEntry myEntry = (MangledEntry) myOIS.readObject();
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134 Transaction myTxn = (Transaction) myOIS.readObject();
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135 long myLease = myOIS.readLong();
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136
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137 myOIS.close();
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138
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139 return new GenericSpaceOp(myOpCode, myEntry,
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140 myTxn, myLease);
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141
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142 } catch (ClassNotFoundException aCNFE) {
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143 IOException myIOE =
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144 new IOException("Failed to unpack operation");
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145
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146 myIOE.initCause(aCNFE);
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147 throw myIOE;
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148 }
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149 }
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150
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151 case TransactionOp.ABORT :
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152 case TransactionOp.COMMIT :
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153 case TransactionOp.PREPARE :
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154 case TransactionOp.PREPARE_COMMIT : {
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155
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156 try {
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157 AnnotatingObjectInputStream myOIS =
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158 new AnnotatingObjectInputStream(null, myBAIS,
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159 myBAIS, false);
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160
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161 TransactionManager myMgr =
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162 (TransactionManager) myOIS.readObject();
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163 long myId = myOIS.readLong();
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164
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165 myOIS.close();
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166
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167 return new TransactionOp(myOpCode, myMgr, myId);
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168
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169 } catch (ClassNotFoundException aCNFE) {
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170 IOException myIOE =
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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171 new IOException("Failed to unpack operation");
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172
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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173 myIOE.initCause(aCNFE);
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174 throw myIOE;
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Dan Creswell <dan.creswell@gmail.com>
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175 }
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parents:
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176 }
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parents:
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177
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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178 default : throw new IOException("Bad Op: " + myOpCode);
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179 }
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180 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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181 }