Mercurial > hg > blitz_stable
annotate src/org/dancres/blitz/remote/nio/CommandFactory.java @ 32:243c74d599bf
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author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 12 Jun 2010 10:41:47 +0100 |
parents | 3dc0c5604566 |
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rev | line source |
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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 = |
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171 new IOException("Failed to unpack operation"); |
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172 |
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173 myIOE.initCause(aCNFE); |
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174 throw myIOE; |
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175 } |
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176 } |
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177 |
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178 default : throw new IOException("Bad Op: " + myOpCode); |
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179 } |
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180 } |
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181 } |