Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/txnlock/TxnLock.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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rev | line source |
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0
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1 package org.dancres.blitz.txnlock; |
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2 |
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3 import java.util.LinkedList; |
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4 import java.util.ArrayList; |
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5 import java.util.List; |
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6 import java.util.logging.*; |
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7 |
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8 import org.dancres.blitz.entry.OpInfo; |
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9 |
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10 import org.dancres.blitz.task.Task; |
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11 import org.dancres.blitz.task.Tasks; |
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12 |
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13 import org.dancres.blitz.txn.TxnId; |
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14 import org.dancres.blitz.txn.TxnState; |
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15 |
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16 import org.dancres.blitz.Logging; |
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17 |
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18 /** |
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19 <p> Every transaction (null or otherwise) must secure a lock for an |
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20 EntrySleeve before it can deemed to have succeeded. When the transaction is |
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21 commited these locks are then released. </p> |
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22 |
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23 <p> Things are slightly more complicated than this because we must handle |
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24 lock conflict and integrate that with the dispatching of blocked takes or |
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25 reads such that we can wake up those blocked matches when the blocking |
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26 transaction is commited. </p> |
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27 */ |
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28 public class TxnLock { |
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29 private static final Logger theLogger = |
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30 Logging.newLogger("org.dancres.blitz.txnlock.TxnLock"); |
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31 |
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32 public static final int WRITE = -1; |
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33 public static final int READ = -2; |
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34 public static final int DELETE = -3; |
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35 |
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36 public static final int SUCCESS = 1; |
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37 public static final int CONFLICT = 2; |
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38 public static final int FAIL = 3; |
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39 |
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40 private List theConflicts; |
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41 |
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42 private ArrayList theLockStates = new ArrayList(); |
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43 |
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44 /* |
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45 DEBUG BITS |
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46 */ |
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47 private static final boolean DEBUG = false; |
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48 private static Object theIdLock = new Object(); |
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49 private static long theNextId = 0; |
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50 private long theId = -1; |
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51 |
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52 private static class LockState { |
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53 private int theType; |
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54 private TxnId theOwner; |
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55 |
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56 LockState(int aType, TxnId anOwner) { |
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57 theType = aType; |
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58 theOwner = anOwner; |
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59 } |
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60 |
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61 int getType() { |
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62 return theType; |
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63 } |
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64 |
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65 TxnId getOwner() { |
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66 return theOwner; |
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67 } |
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68 |
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69 public String toString() { |
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70 return theOwner + ":" + theType; |
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71 } |
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72 } |
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73 |
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74 TxnLock() { |
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75 if (DEBUG) { |
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76 synchronized(theIdLock) { |
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77 theId = ++theNextId; |
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78 } |
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79 } |
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80 } |
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81 |
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82 public boolean isActive() { |
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83 return (theLockStates.size() != 0); |
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84 } |
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85 |
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86 public int test(TxnState anAcquirer, int aDesiredOp) { |
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87 TxnId myTxnId = anAcquirer.getId(); |
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88 |
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89 if (aDesiredOp == WRITE) { |
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90 // Always succeeds |
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91 return SUCCESS; |
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92 } |
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93 |
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94 switch(aDesiredOp) { |
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95 case READ : { |
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96 boolean deleterIsMe = hasDeleterThatsMe(myTxnId); |
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97 TxnId aDeleter = hasDeleter(); |
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98 TxnId aWriter = hasWriterOtherThan(myTxnId); |
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99 |
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100 if (deleterIsMe) { |
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101 return FAIL; |
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102 } else if ((aDeleter != null) || (aWriter != null)) { |
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103 return CONFLICT; |
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104 } else { |
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105 return SUCCESS; |
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106 } |
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107 } |
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108 case DELETE : { |
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109 boolean deleterIsMe = hasDeleterThatsMe(myTxnId); |
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110 TxnId aDeleter = hasDeleter(); |
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111 TxnId aWriter = hasWriterOtherThan(myTxnId); |
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112 TxnId aReader = hasReaderOtherThan(myTxnId); |
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113 |
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114 if (deleterIsMe) |
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115 return FAIL; |
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116 else if ((aDeleter != null) || |
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117 (aReader != null) || |
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118 (aWriter != null)) { |
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119 return CONFLICT; |
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120 } else { |
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121 return SUCCESS; |
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122 } |
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123 } |
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124 default : { |
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125 throw new RuntimeException("Unrecognised acquire op"); |
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126 } |
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127 } |
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128 } |
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129 |
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130 /** |
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131 One calls this method to assert an operation lock on a particular |
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132 EntryUID. On success <code>true</code> is returned and the acquire |
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133 is complete. In the case of failure, the caller is not blocked. |
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134 Rather, we register a callback against the transaction which will |
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135 be invoked after it relinquishes it's lock. Note that there might |
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136 well be more than one blocking transaction but we only bother |
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137 registering against one of them. This might result in a few false |
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138 wakeups but they are unlikely to be performance inhibiting. This |
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139 method should be called in a synchronized block. <P> |
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140 |
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141 Note that writes always succeed so there's no need to pass a callback |
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142 for such acquire requests. |
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143 |
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144 @param anAcquirer TxnId of the transaction which wishes to assert the |
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145 lock. |
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146 @param aDesiredOp should be one of DELETE, READ, |
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147 WRITE |
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148 @param aParty called should a blocking transaction be encountered and |
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149 a second time when the blocking transaction has relinquished the lock |
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150 @param aHandback passed to aParty to allow multiplexing of conflicts |
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151 @param isRecovery when <code>true</code> causes a lock to be asserted |
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152 without performing checks. |
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153 |
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154 @return One of, SUCCESS, CONFLICT or FAIL. |
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155 */ |
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156 public int acquire(TxnState anAcquirer, int aDesiredOp, BaulkedParty aParty, |
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157 Object aHandback, boolean isRecovery) { |
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158 |
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159 TxnId myTxnId = anAcquirer.getId(); |
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160 |
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161 if (aDesiredOp == WRITE) { |
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162 // Always succeeds |
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163 theLockStates.add(new LockState(WRITE, myTxnId)); |
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164 return SUCCESS; |
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165 } |
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166 |
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167 if (isRecovery) { |
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168 switch (aDesiredOp) { |
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169 case READ : { |
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170 theLockStates.add(new LockState(READ, myTxnId)); |
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171 break; |
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172 } |
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173 case DELETE: { |
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174 theLockStates.add(new LockState(DELETE, myTxnId)); |
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175 break; |
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176 } |
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177 } |
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178 |
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179 return SUCCESS; |
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180 } |
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181 |
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182 switch(aDesiredOp) { |
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183 case READ : { |
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184 boolean deleterIsMe = hasDeleterThatsMe(myTxnId); |
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185 TxnId aDeleter = hasDeleter(); |
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186 TxnId aWriter = hasWriterOtherThan(myTxnId); |
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187 |
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188 if (deleterIsMe) { |
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189 return FAIL; |
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190 } else if ((aDeleter != null) || (aWriter != null)) { |
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191 addConflict(aParty, aHandback, |
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192 (aDeleter == null) ? aWriter : aDeleter); |
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193 return CONFLICT; |
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194 } else { |
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195 theLockStates.add(new LockState(READ, myTxnId)); |
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196 return SUCCESS; |
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197 } |
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198 } |
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199 case DELETE : { |
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200 boolean deleterIsMe = hasDeleterThatsMe(myTxnId); |
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201 TxnId aDeleter = hasDeleter(); |
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202 TxnId aWriter = hasWriterOtherThan(myTxnId); |
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203 TxnId aReader = hasReaderOtherThan(myTxnId); |
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204 |
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205 if (deleterIsMe) |
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206 return FAIL; |
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207 else if ((aDeleter != null) || |
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208 (aReader != null) || |
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209 (aWriter != null)) { |
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210 if (aDeleter != null) |
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211 addConflict(aParty, aHandback, aDeleter); |
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212 else |
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213 addConflict(aParty, aHandback, |
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214 (aReader == null) ? aWriter : aReader); |
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215 return CONFLICT; |
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216 } else { |
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217 theLockStates.add(new LockState(DELETE, |
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218 myTxnId)); |
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219 return SUCCESS; |
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220 } |
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221 } |
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222 default : { |
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223 throw new RuntimeException("Unrecognised acquire op"); |
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224 } |
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225 } |
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226 } |
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227 |
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228 private void addConflict(BaulkedParty aParty, Object aHandback, |
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229 TxnId aConflicter) { |
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230 if (aParty == null) |
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231 return; |
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232 |
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233 if (theConflicts == null) |
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234 theConflicts = new ArrayList(); |
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235 // theConflicts = new LinkedList(); |
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236 |
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237 theConflicts.add(new Callback(aConflicter, aParty, aHandback)); |
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238 } |
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239 |
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240 private static class Callback implements Task { |
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241 private TxnId theBlocker; |
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242 private BaulkedParty theParty; |
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243 private Object theHandback; |
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244 |
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245 Callback(TxnId aBlocker, BaulkedParty aParty, Object aHandback) { |
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246 theBlocker = aBlocker; |
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247 theParty = aParty; |
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248 theHandback = aHandback; |
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249 theParty.blocked(aHandback); |
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250 } |
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251 |
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252 TxnId getBlocker() { |
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253 return theBlocker; |
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254 } |
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255 |
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256 BaulkedParty getBaulked() { |
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257 return theParty; |
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258 } |
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259 |
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260 public void run() { |
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261 theParty.unblocked(theHandback); |
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262 } |
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263 } |
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264 |
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265 public void release(TxnState anAcquirer, int anOp) { |
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266 TxnId myId = anAcquirer.getId(); |
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267 |
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268 int myIndex = 0; |
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269 boolean haveReleasedLock = false; |
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270 int myOutstanding = 0; |
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271 |
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272 /* |
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273 Examine all lock states and: |
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274 |
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275 (1) Release the relevant lock state |
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276 (2) Take note of any other lock states associated with this |
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277 transaction. |
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278 */ |
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279 ArrayList myDispatches = new ArrayList(); |
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280 |
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281 synchronized(this) { |
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282 while (myIndex < theLockStates.size()) { |
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283 LockState myState = (LockState) theLockStates.get(myIndex); |
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284 |
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285 // If the lock state is associated with this transaction... |
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286 if (myState.getOwner().equals(myId)) { |
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287 /* |
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288 If we've already released a lock of this type for this |
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289 transaction just note that we've found another lock held |
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290 by the transaction. Otherwise, release the lock and note |
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291 we did that. |
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292 */ |
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293 if ((myState.getType() == anOp) && (! haveReleasedLock)) { |
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294 theLockStates.remove(myIndex); |
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295 haveReleasedLock = true; |
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296 continue; |
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297 } else { |
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298 ++myOutstanding; |
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299 } |
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300 } |
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301 |
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302 ++myIndex; |
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303 } |
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304 |
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305 if (myOutstanding != 0) { |
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306 // System.err.println("Still have outstanding: " + myOutstanding); |
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307 // We haven't released all locks yet - no point waking up blockers |
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308 return; |
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309 } else { |
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310 // System.err.println("Waking up conflicters"); |
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311 } |
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312 |
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313 // Now process any outstanding blockers |
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314 myIndex = 0; |
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315 while ((theConflicts != null) && (myIndex < theConflicts.size())) { |
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316 Callback myCallback = (Callback) theConflicts.get(myIndex); |
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317 |
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318 if (myCallback.getBlocker().equals(myId)) { |
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319 theConflicts.remove(myCallback); |
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320 |
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321 // System.err.println("Dispatching callback"); |
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322 myDispatches.add(myCallback); |
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323 } else { |
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324 ++myIndex; |
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325 } |
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326 } |
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327 } |
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328 |
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329 if (myDispatches.size() > 0) { |
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330 try { |
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331 Tasks.queue(new DispatchTask(myDispatches)); |
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332 } catch (InterruptedException anIE) { |
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333 theLogger.log(Level.SEVERE, |
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334 "Failed to queue Txn callback", anIE); |
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335 } |
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336 } |
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337 } |
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338 |
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339 static class DispatchTask implements Task { |
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340 private ArrayList theDispatches; |
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341 |
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342 DispatchTask(ArrayList aDispatches) { |
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343 theDispatches = aDispatches; |
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344 } |
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345 |
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346 public void run() { |
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347 for (int i = 0; i < theDispatches.size(); i++) { |
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348 ((Task) theDispatches.get(i)).run(); |
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349 } |
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350 } |
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351 } |
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352 |
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353 public TxnId getWriter() { |
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354 for (int i = 0; i < theLockStates.size(); i++) { |
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355 LockState myState = (LockState) theLockStates.get(i); |
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356 |
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357 if (myState.getType() == WRITE) { |
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358 return myState.getOwner(); |
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359 } |
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360 } |
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361 |
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362 return null; |
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363 } |
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364 |
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365 public synchronized boolean hasWriter(TxnId anId) { |
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366 for (int i = 0; i < theLockStates.size(); i++) { |
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367 LockState myState = (LockState) theLockStates.get(i); |
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368 |
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369 if ((myState.getType() == WRITE) && |
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370 (myState.getOwner().equals(anId))) |
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371 return true; |
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372 } |
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373 |
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374 return false; |
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375 } |
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376 |
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377 public synchronized boolean hasOnly(TxnId anId, int anOp) { |
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378 if (theLockStates.size() != 1) |
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379 return false; |
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380 |
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381 LockState myState = (LockState) theLockStates.get(0); |
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382 |
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383 return ((myState.getOwner().equals(anId)) && |
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384 (myState.getType() == anOp)); |
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385 } |
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386 |
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387 private TxnId hasDeleter() { |
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388 for (int i = 0; i < theLockStates.size(); i++) { |
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389 LockState myState = (LockState) theLockStates.get(i); |
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390 |
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391 if (myState.getType() == DELETE) |
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392 return myState.getOwner(); |
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393 } |
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394 |
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395 return null; |
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396 } |
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397 |
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398 private TxnId hasReaderOtherThan(TxnId anId) { |
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399 for (int i = 0; i < theLockStates.size(); i++) { |
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400 LockState myState = (LockState) theLockStates.get(i); |
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401 |
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402 if ((myState.getType() == READ) && |
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403 (! myState.getOwner().equals(anId))) |
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404 return myState.getOwner(); |
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405 } |
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406 |
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407 return null; |
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408 } |
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409 |
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410 private TxnId hasWriterOtherThan(TxnId anId) { |
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411 for (int i = 0; i < theLockStates.size(); i++) { |
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412 LockState myState = (LockState) theLockStates.get(i); |
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413 |
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414 if ((myState.getType() == WRITE) && |
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415 (! myState.getOwner().equals(anId))) |
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416 return myState.getOwner(); |
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417 } |
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418 |
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419 return null; |
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420 } |
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421 |
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422 private boolean hasDeleterThatsMe(TxnId anId) { |
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423 for (int i = 0; i < theLockStates.size(); i++) { |
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424 LockState myState = (LockState) theLockStates.get(i); |
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425 |
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426 if ((myState.getType() == DELETE) && |
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427 (myState.getOwner().equals(anId))) |
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428 return true; |
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429 } |
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430 |
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431 return false; |
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432 } |
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433 |
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434 public String toString() { |
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435 return "TLock: " + theId; |
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436 } |
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437 } |