Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/remote/nio/MessageDecoder.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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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.SpaceImpl; |
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4 import org.dancres.blitz.WriteTicket; |
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5 import org.dancres.blitz.remote.LeaseImpl; |
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6 |
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7 import java.io.ByteArrayOutputStream; |
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8 import java.io.ObjectOutputStream; |
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9 import java.nio.ByteBuffer; |
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10 import java.rmi.RemoteException; |
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11 |
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12 /** |
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13 * Responsible for decoding a serialized space operation as provided by |
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14 * Invoker. It then dispatches the relevant operation and marshals up the |
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15 * return (or exception) befor epassing it back to the ControlBlock for |
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16 * transmission. |
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17 */ |
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18 public class MessageDecoder implements Runnable { |
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19 private static CommandFactory _commandFactory = new CommandFactory(); |
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20 |
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21 private int _reqId; |
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22 private byte[] _operation; |
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23 private ControlBlock _block; |
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24 private SpaceImpl _space; |
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25 |
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26 MessageDecoder(int aReqId,SpaceImpl aSpace, ControlBlock aBlock, |
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27 byte[] anOpBlock) { |
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28 _reqId = aReqId; |
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29 _operation = anOpBlock; |
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30 _block = aBlock; |
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31 _space = aSpace; |
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32 } |
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33 |
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34 /** |
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35 * @todo Put the execution code into the op itself which would save |
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36 * the switch etc and allow us to drop the test for GenericSpaceOp etc. |
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37 * It'll also be easier to add say TransactionOp so we can extend the |
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38 * interface to TransactionParticipant |
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39 */ |
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40 public void run() { |
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41 Object myResult = null; |
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42 try { |
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43 // System.err.println("Received op: " + _reqId + ", " + _operation.length); |
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44 Operation myOp = _commandFactory.unpack(_operation); |
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45 |
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46 if (myOp instanceof GenericSpaceOp) { |
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47 GenericSpaceOp mySpaceOp = (GenericSpaceOp) myOp; |
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48 |
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49 switch (mySpaceOp.getOperation()) { |
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50 case GenericSpaceOp.WRITE : { |
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51 WriteTicket myTicket = |
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52 _space.write(mySpaceOp.getEntry(), |
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53 mySpaceOp.getTxn(), |
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54 mySpaceOp.getLease()); |
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55 |
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56 myResult = new LeaseImpl(null, null, myTicket.getUID(), |
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57 myTicket.getExpirationTime()); |
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58 break; |
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59 } |
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60 |
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61 case GenericSpaceOp.TAKE : { |
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62 myResult = |
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63 _space.take(mySpaceOp.getEntry(), |
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64 mySpaceOp.getTxn(), |
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65 mySpaceOp.getLease()); |
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66 break; |
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67 } |
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68 |
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69 case GenericSpaceOp.TAKE_EXISTS : { |
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70 myResult = |
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71 _space.takeIfExists(mySpaceOp.getEntry(), |
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72 mySpaceOp.getTxn(), |
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73 mySpaceOp.getLease()); |
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74 break; |
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75 } |
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76 |
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77 case GenericSpaceOp.READ : { |
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78 myResult = |
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79 _space.read(mySpaceOp.getEntry(), |
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80 mySpaceOp.getTxn(), |
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81 mySpaceOp.getLease()); |
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82 break; |
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83 } |
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84 |
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85 case GenericSpaceOp.READ_EXISTS : { |
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86 myResult = |
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87 _space.readIfExists(mySpaceOp.getEntry(), |
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88 mySpaceOp.getTxn(), |
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89 mySpaceOp.getLease()); |
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90 break; |
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91 } |
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92 |
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93 default : |
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94 myResult = new RemoteException("Unrecognised space op"); |
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95 } |
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96 } else if (myOp instanceof TransactionOp) { |
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97 TransactionOp myTxnOp = (TransactionOp) myOp; |
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98 |
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99 switch (myTxnOp.getOperation()) { |
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100 case TransactionOp.PREPARE : { |
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101 int myCode = |
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102 _space.getTxnControl().prepare(myTxnOp.getMgr(), |
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103 myTxnOp.getId()); |
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104 |
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105 myResult = new Integer(myCode); |
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106 break; |
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107 } |
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108 |
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109 case TransactionOp.COMMIT : { |
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110 _space.getTxnControl().commit(myTxnOp.getMgr(), |
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111 myTxnOp.getId()); |
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112 break; |
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113 } |
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114 |
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115 case TransactionOp.ABORT : { |
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116 _space.getTxnControl().abort(myTxnOp.getMgr(), |
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117 myTxnOp.getId()); |
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118 break; |
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119 } |
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120 |
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121 case TransactionOp.PREPARE_COMMIT : { |
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122 int myCode = |
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123 _space.getTxnControl().prepareAndCommit(myTxnOp.getMgr(), |
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124 myTxnOp.getId()); |
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125 |
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126 myResult = new Integer(myCode); |
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127 break; |
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128 } |
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129 |
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130 default : |
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131 myResult = new RemoteException("Unrecognised txn op"); |
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132 } |
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133 } |
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134 } catch (Throwable aT) { |
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135 System.err.println("Failed to dispatch request"); |
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136 aT.printStackTrace(System.err); |
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137 |
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138 myResult = aT; |
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139 } |
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140 |
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141 ByteArrayOutputStream myBAOS = new ByteArrayOutputStream(); |
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142 |
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143 try { |
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144 ObjectOutputStream myOOS = new ObjectOutputStream(myBAOS); |
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145 myOOS.writeObject(myResult); |
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146 myOOS.close(); |
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147 } catch (Exception anE) { |
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148 System.err.println("Failed to marshall response"); |
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149 anE.printStackTrace(System.err); |
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150 } |
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151 |
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152 ByteBuffer myBuffer = ByteBuffer.allocate(myBAOS.size() + 8); |
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153 |
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154 // System.err.println("Sending: " + _reqId + ", " + myBAOS.size()); |
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155 myBuffer.putInt(_reqId); |
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156 myBuffer.putInt(myBAOS.size()); |
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157 myBuffer.put(myBAOS.toByteArray()); |
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158 |
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159 myBuffer.flip(); |
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160 _block.send(new ByteBuffer[] {myBuffer}); |
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161 } |
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162 } |