Mercurial > hg > blitz_stable

annotate src/org/dancres/blitz/txnlock/TxnLock.java @ 32:243c74d599bf

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author Dan Creswell <dan.creswell@gmail.com>
date Sat, 12 Jun 2010 10:41:47 +0100
parents 3dc0c5604566
children
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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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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
136 well be more than one blocking transaction but we only bother
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
137 registering against one of them. This might result in a few false
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
138 wakeups but they are unlikely to be performance inhibiting. This
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
139 method should be called in a synchronized block. <P>
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
140
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
141 Note that writes always succeed so there's no need to pass a callback
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
142 for such acquire requests.
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
143
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
144 @param anAcquirer TxnId of the transaction which wishes to assert the
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
145 lock.
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
146 @param aDesiredOp should be one of DELETE, READ,
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
147 WRITE
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
148 @param aParty called should a blocking transaction be encountered and
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
149 a second time when the blocking transaction has relinquished the lock
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
150 @param aHandback passed to aParty to allow multiplexing of conflicts
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
151 @param isRecovery when <code>true</code> causes a lock to be asserted
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
152 without performing checks.
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
153
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
154 @return One of, SUCCESS, CONFLICT or FAIL.
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
155 */
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
156 public int acquire(TxnState anAcquirer, int aDesiredOp, BaulkedParty aParty,
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
157 Object aHandback, boolean isRecovery) {
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
158
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
159 TxnId myTxnId = anAcquirer.getId();
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
160
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
161 if (aDesiredOp == WRITE) {
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
162 // Always succeeds
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
163 theLockStates.add(new LockState(WRITE, myTxnId));
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Dan Creswell <dan.creswell@gmail.com>
parents:
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164 return SUCCESS;
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
165 }
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
166
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
167 if (isRecovery) {
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
168 switch (aDesiredOp) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
169 case READ : {
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
170 theLockStates.add(new LockState(READ, myTxnId));
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
171 break;
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Dan Creswell <dan.creswell@gmail.com>
parents:
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172 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
173 case DELETE: {
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
174 theLockStates.add(new LockState(DELETE, myTxnId));
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
175 break;
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Dan Creswell <dan.creswell@gmail.com>
parents:
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176 }
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Dan Creswell <dan.creswell@gmail.com>
parents:
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177 }
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Dan Creswell <dan.creswell@gmail.com>
parents:
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178
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Dan Creswell <dan.creswell@gmail.com>
parents:
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179 return SUCCESS;
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Dan Creswell <dan.creswell@gmail.com>
parents:
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180 }
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
181
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
182 switch(aDesiredOp) {
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
183 case READ : {
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
184 boolean deleterIsMe = hasDeleterThatsMe(myTxnId);
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Dan Creswell <dan.creswell@gmail.com>
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185 TxnId aDeleter = hasDeleter();
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
186 TxnId aWriter = hasWriterOtherThan(myTxnId);
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
187
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
188 if (deleterIsMe) {
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Dan Creswell <dan.creswell@gmail.com>
parents:
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189 return FAIL;
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
190 } else if ((aDeleter != null) || (aWriter != null)) {
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
191 addConflict(aParty, aHandback,
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
192 (aDeleter == null) ? aWriter : aDeleter);
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Dan Creswell <dan.creswell@gmail.com>
parents:
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193 return CONFLICT;
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
194 } else {
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
195 theLockStates.add(new LockState(READ, myTxnId));
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Dan Creswell <dan.creswell@gmail.com>
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196 return SUCCESS;
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Dan Creswell <dan.creswell@gmail.com>
parents:
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197 }
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Dan Creswell <dan.creswell@gmail.com>
parents:
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198 }
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
199 case DELETE : {
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
200 boolean deleterIsMe = hasDeleterThatsMe(myTxnId);
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
201 TxnId aDeleter = hasDeleter();
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
202 TxnId aWriter = hasWriterOtherThan(myTxnId);
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
203 TxnId aReader = hasReaderOtherThan(myTxnId);
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
204
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
205 if (deleterIsMe)
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
206 return FAIL;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
207 else if ((aDeleter != null) ||
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
208 (aReader != null) ||
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
209 (aWriter != null)) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
210 if (aDeleter != null)
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
211 addConflict(aParty, aHandback, aDeleter);
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
212 else
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
213 addConflict(aParty, aHandback,
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
214 (aReader == null) ? aWriter : aReader);
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
215 return CONFLICT;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
216 } else {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
217 theLockStates.add(new LockState(DELETE,
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
218 myTxnId));
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
219 return SUCCESS;
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
220 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
221 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
222 default : {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
223 throw new RuntimeException("Unrecognised acquire op");
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
224 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
225 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
226 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
227
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
228 private void addConflict(BaulkedParty aParty, Object aHandback,
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
229 TxnId aConflicter) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
230 if (aParty == null)
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
231 return;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
232
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
233 if (theConflicts == null)
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
234 theConflicts = new ArrayList();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
235 // theConflicts = new LinkedList();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
236
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
237 theConflicts.add(new Callback(aConflicter, aParty, aHandback));
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
238 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
239
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
240 private static class Callback implements Task {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
241 private TxnId theBlocker;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
242 private BaulkedParty theParty;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
243 private Object theHandback;
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
244
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
245 Callback(TxnId aBlocker, BaulkedParty aParty, Object aHandback) {
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
246 theBlocker = aBlocker;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
247 theParty = aParty;
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
248 theHandback = aHandback;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
249 theParty.blocked(aHandback);
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
250 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
251
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
252 TxnId getBlocker() {
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
253 return theBlocker;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
254 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
255
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
256 BaulkedParty getBaulked() {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
257 return theParty;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
258 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
259
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
260 public void run() {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
261 theParty.unblocked(theHandback);
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
262 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
263 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
264
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
265 public void release(TxnState anAcquirer, int anOp) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
266 TxnId myId = anAcquirer.getId();
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
267
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
268 int myIndex = 0;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
269 boolean haveReleasedLock = false;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
270 int myOutstanding = 0;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
271
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
272 /*
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
273 Examine all lock states and:
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
274
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
275 (1) Release the relevant lock state
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
276 (2) Take note of any other lock states associated with this
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
277 transaction.
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
278 */
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
279 ArrayList myDispatches = new ArrayList();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
280
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
281 synchronized(this) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
282 while (myIndex < theLockStates.size()) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
283 LockState myState = (LockState) theLockStates.get(myIndex);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
284
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
285 // If the lock state is associated with this transaction...
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
286 if (myState.getOwner().equals(myId)) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
287 /*
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
288 If we've already released a lock of this type for this
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
289 transaction just note that we've found another lock held
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
290 by the transaction. Otherwise, release the lock and note
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
291 we did that.
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
292 */
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
293 if ((myState.getType() == anOp) && (! haveReleasedLock)) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
294 theLockStates.remove(myIndex);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
295 haveReleasedLock = true;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
296 continue;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
297 } else {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
298 ++myOutstanding;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
299 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
300 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
301
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
302 ++myIndex;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
303 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
304
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
305 if (myOutstanding != 0) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
306 // System.err.println("Still have outstanding: " + myOutstanding);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
307 // We haven't released all locks yet - no point waking up blockers
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
308 return;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
309 } else {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
310 // System.err.println("Waking up conflicters");
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
311 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
312
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
313 // Now process any outstanding blockers
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
314 myIndex = 0;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
315 while ((theConflicts != null) && (myIndex < theConflicts.size())) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
316 Callback myCallback = (Callback) theConflicts.get(myIndex);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
317
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
318 if (myCallback.getBlocker().equals(myId)) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
319 theConflicts.remove(myCallback);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
320
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
321 // System.err.println("Dispatching callback");
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
322 myDispatches.add(myCallback);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
323 } else {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
324 ++myIndex;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
325 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
326 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
327 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
328
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
329 if (myDispatches.size() > 0) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
330 try {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
331 Tasks.queue(new DispatchTask(myDispatches));
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
332 } catch (InterruptedException anIE) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
333 theLogger.log(Level.SEVERE,
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
334 "Failed to queue Txn callback", anIE);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
335 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
336 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
337 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
338
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
339 static class DispatchTask implements Task {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
340 private ArrayList theDispatches;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
341
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
342 DispatchTask(ArrayList aDispatches) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
343 theDispatches = aDispatches;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
344 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
345
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
346 public void run() {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
347 for (int i = 0; i < theDispatches.size(); i++) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
348 ((Task) theDispatches.get(i)).run();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
349 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
350 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
351 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
352
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
353 public TxnId getWriter() {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
354 for (int i = 0; i < theLockStates.size(); i++) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
355 LockState myState = (LockState) theLockStates.get(i);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
356
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
357 if (myState.getType() == WRITE) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
358 return myState.getOwner();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
359 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
360 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
361
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
362 return null;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
363 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
364
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
365 public synchronized boolean hasWriter(TxnId anId) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
366 for (int i = 0; i < theLockStates.size(); i++) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
367 LockState myState = (LockState) theLockStates.get(i);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
368
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
369 if ((myState.getType() == WRITE) &&
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
370 (myState.getOwner().equals(anId)))
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
371 return true;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
372 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
373
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
374 return false;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
375 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
376
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
377 public synchronized boolean hasOnly(TxnId anId, int anOp) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
378 if (theLockStates.size() != 1)
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
379 return false;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
380
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
381 LockState myState = (LockState) theLockStates.get(0);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
382
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
383 return ((myState.getOwner().equals(anId)) &&
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
384 (myState.getType() == anOp));
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
385 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
386
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
387 private TxnId hasDeleter() {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
388 for (int i = 0; i < theLockStates.size(); i++) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
389 LockState myState = (LockState) theLockStates.get(i);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
390
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
391 if (myState.getType() == DELETE)
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
392 return myState.getOwner();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
393 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
394
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
395 return null;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
396 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
397
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
398 private TxnId hasReaderOtherThan(TxnId anId) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
399 for (int i = 0; i < theLockStates.size(); i++) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
400 LockState myState = (LockState) theLockStates.get(i);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
401
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
402 if ((myState.getType() == READ) &&
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
403 (! myState.getOwner().equals(anId)))
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
404 return myState.getOwner();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
405 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
406
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
407 return null;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
408 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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409
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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410 private TxnId hasWriterOtherThan(TxnId anId) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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411 for (int i = 0; i < theLockStates.size(); i++) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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412 LockState myState = (LockState) theLockStates.get(i);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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413
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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414 if ((myState.getType() == WRITE) &&
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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415 (! myState.getOwner().equals(anId)))
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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416 return myState.getOwner();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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417 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
418
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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419 return null;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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420 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
421
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
422 private boolean hasDeleterThatsMe(TxnId anId) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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423 for (int i = 0; i < theLockStates.size(); i++) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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424 LockState myState = (LockState) theLockStates.get(i);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
425
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
426 if ((myState.getType() == DELETE) &&
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
427 (myState.getOwner().equals(anId)))
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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428 return true;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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429 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
430
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
431 return false;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
432 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
433
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
434 public String toString() {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
435 return "TLock: " + theId;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
436 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
437 }