Mercurial > hg > blitz_stable

annotate src/org/dancres/blitz/txn/TxnManagerState.java @ 35:6f68e94c1fb8 default tip

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Add CondensedStats monitoring utility, equivalent to vmstat
author Dominic Cleal <dominic-cleal@cdo2.com>
date Thu, 05 Aug 2010 11:07:25 +0100
parents 3dc0c5604566
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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0
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1 package org.dancres.blitz.txn;
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2
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3 import java.io.IOException;
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4 import java.io.ObjectInputStream;
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5 import java.io.ObjectOutputStream;
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6 import java.io.Serializable;
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7 import java.rmi.RemoteException;
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8 import java.util.ArrayList;
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9 import java.util.HashMap;
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10 import java.util.Iterator;
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11 import java.util.List;
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12 import java.util.logging.Level;
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13
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14 import net.jini.core.transaction.TransactionException;
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15 import net.jini.core.transaction.UnknownTransactionException;
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16 import net.jini.core.transaction.server.TransactionConstants;
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17
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18 import org.prevayler.AlarmClock;
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19 import org.prevayler.PrevalentSystem;
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20 import org.prevayler.SnapshotContributor;
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21
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22 /**
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23 Responsible for tracking/managing transactions. This responsiblity is split
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24 across two classes. TxnManager handles control aspects whilst
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25 TxnManagerState tracks the transactional information. <P>
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26
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27 @see org.dancres.blitz.txn.TxnManager
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28 */
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29 class TxnManagerState implements PrevalentSystem {
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30 static final long serialVersionUID = -5650181362477845180L;
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31
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32 private static boolean UPGRADE = false;
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33
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34 /*
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35 These member variables are serialized as part of writeObject and
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36 de-serialized as part of readObject (which also initializes appropriate
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37 state). i.e. We don't just serialize this object directly.
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38 */
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39 private AlarmClock theClock;
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40
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41 private HashMap theTxns = new HashMap();
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42
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43 private Serializable[] theSnapshotContributions = new Serializable[0];
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44
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45 private ArrayList theSnapshotContributors = new ArrayList();
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46
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47 static void enableUpgrade() {
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48 UPGRADE = true;
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49 }
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50
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51 public void clock(AlarmClock aClock) {
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52 theClock = aClock;
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53 }
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54
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55 public AlarmClock clock() {
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56 return theClock;
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57 }
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58
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59 public List getActiveTxnIds() {
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60 ArrayList myTxnIds = new ArrayList();
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61
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62 synchronized(this) {
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63 Iterator myTxns = theTxns.keySet().iterator();
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64
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65 while (myTxns.hasNext()) {
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66 TxnId myId = (TxnId) myTxns.next();
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67 myTxnIds.add(myId);
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68 }
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69 }
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70
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71 return myTxnIds;
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72 }
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73
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74 public void add(SnapshotContributor aContributor) {
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75 synchronized(theSnapshotContributors) {
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76 if (!theSnapshotContributors.contains(aContributor))
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77 theSnapshotContributors.add(aContributor);
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78 }
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79 }
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80
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81 public void remove(SnapshotContributor aContributor) {
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82 synchronized(theSnapshotContributors) {
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83 theSnapshotContributors.remove(aContributor);
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84 }
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85 }
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86
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87 public Serializable[] getSnapshotContributions() {
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88 return theSnapshotContributions;
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89 }
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90
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91 private void writeObject(ObjectOutputStream anOut) throws IOException {
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92 anOut.writeObject(LogVersion.VERSION);
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93
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94 /*
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95 We only save PREPARED transactions, ignoring ACTIVES because
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96 they are transient and their state changes won't be applied
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97 until we've issued prepare and then commit or abort. The ACTIVES
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98 will either die due to failure or, post the sync, add operations
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99 to the log. Note that, whilst a transaction is active, it generates
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100 no log records at all hence the reason we don't need to save them.
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101 Commited or aborted updates in cache which need flushing to disk
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102 should have already been sync'd before we get this far.
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103 */
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104 ArrayList myPrepared = new ArrayList();
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105
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106 synchronized(this) {
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107 // Write out clock
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108 //
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109 anOut.writeObject(theClock);
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110
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111 Iterator myTxns = theTxns.keySet().iterator();
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112
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113 while (myTxns.hasNext()) {
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114 TxnId myId = (TxnId) myTxns.next();
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115
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116 TxnState myState = getState(myId);
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117
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118 try {
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119 int myStatus = myState.getStatus();
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120
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121 if (myStatus == TransactionConstants.PREPARED) {
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122 myPrepared.add(myState);
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123 }
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124
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125 } catch (TransactionException aTE) {
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126 // Whoops, got nailed checking status, logged in the call
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127 // nothing to do.
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128 }
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129 }
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130
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131 anOut.writeInt(myPrepared.size());
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132
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133 for (int i = 0; i < myPrepared.size(); i++) {
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134 anOut.writeObject(myPrepared.get(i));
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135 }
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Dan Creswell <dan.creswell@gmail.com>
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136 }
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parents:
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137
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Dan Creswell <dan.creswell@gmail.com>
parents:
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138 /*
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Dan Creswell <dan.creswell@gmail.com>
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139 Write out any user-code snapshot contributions
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Dan Creswell <dan.creswell@gmail.com>
parents:
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140 */
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Dan Creswell <dan.creswell@gmail.com>
parents:
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141 ArrayList myContributions = new ArrayList();
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Dan Creswell <dan.creswell@gmail.com>
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142
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Dan Creswell <dan.creswell@gmail.com>
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143 synchronized(theSnapshotContributors) {
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144 for (int i = 0; i < theSnapshotContributors.size(); i++) {
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145 myContributions.add(((SnapshotContributor) theSnapshotContributors.get(i)).getContribution());
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146 }
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Dan Creswell <dan.creswell@gmail.com>
parents:
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147 }
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148
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149 Serializable[] myUserData = new Serializable[myContributions.size()];
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150 myUserData = (Serializable[]) myContributions.toArray(myUserData);
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151
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152 anOut.writeObject(myUserData);
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Dan Creswell <dan.creswell@gmail.com>
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153 }
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154
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Dan Creswell <dan.creswell@gmail.com>
parents:
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155 private void readObject(ObjectInputStream anIn)
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Dan Creswell <dan.creswell@gmail.com>
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156 throws IOException, ClassNotFoundException {
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157
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158 boolean isUpgrade = false;
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159
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Dan Creswell <dan.creswell@gmail.com>
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160 theTxns = new HashMap();
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Dan Creswell <dan.creswell@gmail.com>
parents:
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161 theSnapshotContributors = new ArrayList();
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Dan Creswell <dan.creswell@gmail.com>
parents:
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162
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Dan Creswell <dan.creswell@gmail.com>
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163 Object myFirst = anIn.readObject();
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164
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Dan Creswell <dan.creswell@gmail.com>
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165 /*
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166 If there's no LogVersion, chances are we're looking at a pre 1.13
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167 log format - upgrade is simple as there's no LogVersion and there
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168 will be no user checkpoint data so we just ignore those fields.
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169 */
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170 if (! (myFirst instanceof LogVersion)) {
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171 TxnManager.theLogger.log(Level.SEVERE, "Upgrading old transaction log");
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172 isUpgrade = true;
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173 theClock = (AlarmClock) myFirst;
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Dan Creswell <dan.creswell@gmail.com>
parents:
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174 } else {
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175 LogVersion myVersion = (LogVersion) myFirst;
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176
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177 if (!myVersion.equals(LogVersion.VERSION))
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178 throw new IOException("Yikes - log versions don't match - upgrade?" + myVersion);
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179
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180 theClock = (AlarmClock) anIn.readObject();
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181 }
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parents:
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182
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Dan Creswell <dan.creswell@gmail.com>
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183 int myNumRecords = anIn.readInt();
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parents:
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184
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185 synchronized(this) {
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186
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187 for (int i = 0; i < myNumRecords; i++) {
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188 TxnState myState = (TxnState) anIn.readObject();
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189
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Dan Creswell <dan.creswell@gmail.com>
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diff changeset
190 try {
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parents:
diff changeset
191 myState.prepare(true);
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
192 } catch (UnknownTransactionException aUTE) {
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
193 IOException anIOE = new IOException("Failed to recover prepare");
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parents:
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194 anIOE.initCause(aUTE);
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Dan Creswell <dan.creswell@gmail.com>
parents:
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195 throw anIOE;
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196 }
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197
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diff changeset
198 theTxns.put(myState.getId(), myState);
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199 }
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parents:
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200 }
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
201
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parents:
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202 if (isUpgrade)
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203 theSnapshotContributions = new Serializable[0];
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204 else
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205 theSnapshotContributions = (Serializable[]) anIn.readObject();
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206 }
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parents:
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207
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diff changeset
208 private TxnState getState(TxnId anId) {
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209 synchronized(this) {
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diff changeset
210 return (TxnState) theTxns.get(anId);
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211 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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212 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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213
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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214 /**
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Dan Creswell <dan.creswell@gmail.com>
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diff changeset
215 Resolve a transaction using this method before calling any of
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
216 <code>prepare</code>, <code>commit</code>, <code>abort</code> or
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
217 <code>prepareAndCommit</code>.
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
218
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
219 @todo Add Janitor/Checker thread to clear out dead transaction
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
220 state - see comments in method
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
221 */
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
222 TxnState getTxnFor(TxnId anId, TxnGateway aGateway, boolean mustExist)
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parents:
diff changeset
223 throws UnknownTransactionException {
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
224
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
225 TxnState myState = null;
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
226
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
227 if (mustExist) {
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
228 myState = getState(anId);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
229 } else {
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
230 synchronized(this) {
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
231 myState = (TxnState) theTxns.get(anId);
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
232 }
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
233
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
234 /*
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
235 If state doesn't exist, we need to join and update the state
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
236 */
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
237 if (myState == null) {
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
238 try {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
239 aGateway.join(anId);
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
240 } catch (Exception anException) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
241 TxnManager.theLogger.log(Level.SEVERE,
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
242 "Failed to join txn" +
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
243 anId, anException);
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
244
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
245 throw new UnknownTransactionException();
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
246 }
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
247
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
248 /*
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
249 There's a race condition here where the transaction
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
250 could be prepared before we get our state updated.
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
251 If that happens, the prepare method will bounce
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
252 the prepare call blowing the transaction out.
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Dan Creswell <dan.creswell@gmail.com>
parents:
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253
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
254 This will leave us with a bit of dead txn state which
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
255 we ought to cleanup by invoking getState etc. This
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
256 could be done by a janitor thread in the future.
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parents:
diff changeset
257
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
258 In reality:
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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 (a) This is unlikely
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
261 (b) Should this happen, we're going to be the least of
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
262 the problems because someone somewhere thinks
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
263 the transaction is active (this thread is acting on
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
264 their behalf) and someone else is closing it out.
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
265 When the client associated with this thread invokes
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
266 commit there'll be a big nasty mess.
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
267 */
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
268 synchronized(this) {
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parents:
diff changeset
269
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
270 /*
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
271 Up till now, we race to create/join the transaction
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272 (see above). Now we must put it right....
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273 */
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274 myState = (TxnState) theTxns.get(anId);
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275 if (myState == null) {
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276 myState = new TxnState(anId);
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277 theTxns.put(anId, myState);
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278 }
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279 }
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Dan Creswell <dan.creswell@gmail.com>
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280 }
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Dan Creswell <dan.creswell@gmail.com>
parents:
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281 }
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282
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
283 if (myState == null)
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
284 throw new UnknownTransactionException();
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
285 else
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Dan Creswell <dan.creswell@gmail.com>
parents:
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286 return myState;
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Dan Creswell <dan.creswell@gmail.com>
parents:
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287 }
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parents:
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288
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Dan Creswell <dan.creswell@gmail.com>
parents:
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289 /**
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
290 In cases where no explicit transaction has been passed in by a caller,
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
291 create a null transaction which is an internal, fully transactional
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
292 replacement which can be used for the duration of the operation
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
293 in question.
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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294 */
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295 TxnState newNullTxn() throws RemoteException {
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296 TxnId myId = TxnId.newNullTxn();
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297 TxnState myState = new TxnState(myId);
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298
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diff changeset
299 synchronized(this) {
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300 theTxns.put(myId, myState);
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301 }
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parents:
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302
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303 return myState;
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304 }
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parents:
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305
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Dan Creswell <dan.creswell@gmail.com>
parents:
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306 /**
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Dan Creswell <dan.creswell@gmail.com>
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307 In cases where no state will be changed (no Entry's taken or written),
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308 create an instance of this transaction which, when commited or aborted
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
309 will be undone but not logged.
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
310 */
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Dan Creswell <dan.creswell@gmail.com>
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diff changeset
311 TxnState newIdentityTxn() throws RemoteException {
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Dan Creswell <dan.creswell@gmail.com>
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312 TxnId myId = TxnId.newNullTxn();
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313 TxnState myState = new TxnState(myId, true);
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Dan Creswell <dan.creswell@gmail.com>
parents:
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314
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Dan Creswell <dan.creswell@gmail.com>
parents:
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315 synchronized(this) {
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316 theTxns.put(myId, myState);
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Dan Creswell <dan.creswell@gmail.com>
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317 }
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Dan Creswell <dan.creswell@gmail.com>
parents:
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318
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Dan Creswell <dan.creswell@gmail.com>
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319 return myState;
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Dan Creswell <dan.creswell@gmail.com>
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320 }
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
321
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
322 /**
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
323 Do not call this method directly - it should only be invoked from
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
324 a Prevayler command.
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
325 */
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
326 int prepare(TxnState aState)
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
327 throws UnknownTransactionException, IOException {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
328
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
329 /*
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
330 Do we know about this transaction?
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
331
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
332 If we don't we've failed and are now doing recovery so we must
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
333 re-insert the state.
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
334 */
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
335 boolean needsRestore = (getState(aState.getId()) == null);
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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 if (needsRestore) {
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
338 synchronized(this) {
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
339 theTxns.put(aState.getId(), aState);
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
340 }
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
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
343 return aState.prepare(needsRestore);
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Dan Creswell <dan.creswell@gmail.com>
parents:
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344 }
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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 /**
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
347 Do not call this method directly - it should only be invoked from
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
348 a Prevayler command.
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
349 */
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
350 void commit(TxnId anId)
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
351 throws UnknownTransactionException, IOException {
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
352
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
353 TxnState myState = getTxnFor(anId, null, true);
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
354
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
355 myState.commit();
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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 removeTxn(anId);
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
358 }
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 Do not call this method directly - it should only be invoked from
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
362 a Prevayler command.
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 void abort(TxnId anId)
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
365 throws UnknownTransactionException, IOException {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
366
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
367 TxnState myState = getTxnFor(anId, null, true);
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 myState.abort();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
370 removeTxn(anId);
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
371 }
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 void abortAll() throws IOException {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
374 synchronized(this) {
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
375 Iterator myTxns = theTxns.keySet().iterator();
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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 while (myTxns.hasNext()) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
378 TxnId myId = (TxnId) myTxns.next();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
379
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
380 TxnState myState = getState(myId);
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
381
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
382 try {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
383 int myStatus = myState.getStatus();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
384
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
385 if ((myStatus == TransactionConstants.PREPARED) ||
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
386 (myStatus == TransactionConstants.ACTIVE)) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
387
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
388 /*
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
389 * AbortAll is a naive operation in that it has no
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
390 * awareness of a specific transaction thus it cannot
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
391 * explicitly vote one of them off so we must do it
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
392 * ourselves
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 myState.vote();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
395 myState.abort();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
396 myTxns.remove();
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
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
399 } catch (TransactionException aTE) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
400 // Whoops, got nailed checking status, logged in the call
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
401 // nothing to do.
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
402 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
403 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
404 }
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 private void removeTxn(TxnId anId) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
408 TxnState myState;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
409
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
410 synchronized(this) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
411 myState = (TxnState) theTxns.remove(anId);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
412 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
413 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
414
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
415 int getNumActiveTxns() {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
416 synchronized(this) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
417 return theTxns.size();
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:
diff changeset
419 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
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