Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/txn/TxnState.java @ 34:6f68e94c1fb8 default tip
Add CondensedStats monitoring utility, equivalent to vmstat
author | Dominic Cleal <dominic-cleal@cdo2.com> |
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date | Thu, 05 Aug 2010 11:07:25 +0100 |
parents | 3dc0c5604566 |
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0
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1 package org.dancres.blitz.txn; |
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2 |
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3 import java.io.IOException; |
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4 import java.util.ArrayList; |
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5 import java.util.Iterator; |
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6 import java.util.logging.Level; |
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7 |
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8 import net.jini.core.transaction.TransactionException; |
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9 import net.jini.core.transaction.UnknownTransactionException; |
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10 import net.jini.core.transaction.server.TransactionConstants; |
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11 |
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12 import org.dancres.blitz.disk.DiskTxn; |
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13 import org.dancres.blitz.notify.EventQueue; |
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14 import org.dancres.blitz.notify.QueueEvent; |
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15 import org.dancres.blitz.task.Task; |
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16 import org.dancres.blitz.task.Tasks; |
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17 |
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18 /* |
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19 * We only need to post QueueEvent.TRANSACTION_ENDED during live work, not |
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20 * during recovery as it will only be relevant to active notifies. When |
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21 * we restart the only active notifies left would be those not interested in |
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22 * the event because they were registered with a null transaction. |
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23 * |
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24 * Given the above, we can post the event from doFinalize which will be |
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25 * called in TxnManager as part of "live" operations. This neatly ensures |
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26 * we will only do this work outside of recovery. |
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27 * |
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28 * We will post TRANSACTION_ENDED even for null transactions and for each |
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29 * such event scan the generators and kill any that are anchored against |
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30 * the transaction - this should be done via a new method to test this. |
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31 * |
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32 * EventGenerators should only profess interest if they aren't already tainted |
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33 * as they do with canSee etc. |
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34 * |
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35 * Note we needn't call kill we could just pass the event into all generators |
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36 * and have them taint and then kill themselves (assuming they no longer |
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37 * dispatch CleanTask). We could then strip out TxnNotify's but we would need |
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38 * to add support for TRANSACTION_ENDED to each canSee method. |
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39 */ |
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40 |
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41 /** |
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42 Contains all state associated with a particular transaction identified |
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43 by TxnId. |
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44 |
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45 @todo Deal with TRANSACTION_ENDED etc as above |
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46 */ |
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47 public class TxnState implements java.io.Serializable { |
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48 static final long serialVersionUID = 2855252304868267667L; |
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49 |
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50 private int theState = TransactionConstants.ACTIVE; |
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51 |
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52 private TxnId theId; |
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53 |
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54 private boolean nonDestructive; |
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55 |
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56 /* |
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57 Typical transaction might be take/write or a few ops more, so we |
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58 allocate accordingly |
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59 |
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60 @todo Decide if this is appropriate/worth doing |
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61 */ |
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62 private ArrayList theOperations = new ArrayList(5); |
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63 |
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64 TxnState(TxnId anId) { |
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65 theId = anId; |
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66 } |
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67 |
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68 TxnState(TxnId anId, boolean isIdentity) { |
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69 theId = anId; |
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70 nonDestructive = isIdentity; |
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71 } |
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72 |
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73 public TxnId getId() { |
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74 return theId; |
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75 } |
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76 |
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77 int getStatus() throws TransactionException { |
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78 synchronized(this) { |
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79 return theState; |
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80 } |
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81 } |
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82 |
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83 public void add(TxnOp anOp) throws TransactionException { |
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84 synchronized (this) { |
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85 if (theState != TransactionConstants.ACTIVE) { |
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86 TxnManager.theLogger.log(Level.SEVERE, |
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87 "Txn not in active state at addOp"); |
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88 throw new TransactionException("Transaction no longer active"); |
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89 } else { |
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90 theOperations.add(anOp); |
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91 } |
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92 } |
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93 } |
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94 |
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95 /** |
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96 * A move to voting state indicates this transaction is going to be resolved |
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97 * and thus cannot have any further actions assigned to it. Note that |
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98 * voting state will only be asserted if the transaction is currently |
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99 * active. Voting is a transient state and only exists temporarily whilst |
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100 * we move to a resolved state. It's only benefit is that it renders |
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101 * a transaction's state unchangeable and allows us to make binding |
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102 * decisions such as whether we need to log to disk. |
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103 */ |
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104 int vote() throws TransactionException { |
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105 int myState; |
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106 |
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107 synchronized (this) { |
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108 |
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109 if (theState == TransactionConstants.ACTIVE) { |
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110 theState = TransactionConstants.VOTING; |
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111 } |
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112 |
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113 myState = theState; |
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114 } |
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115 |
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116 return myState; |
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117 } |
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118 |
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119 /** |
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120 * @todo Decide if ths DiskTxn is required here - probably not? |
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121 */ |
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122 int prepare(boolean needsRestore) |
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123 throws UnknownTransactionException, IOException { |
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124 |
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125 if (needsRestore) { |
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126 /* |
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127 If we're doing restore, we're single threaded and don't need |
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128 the protection of the lock (getLock()) |
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129 */ |
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130 // DiskTxn myTxn = DiskTxn.newTxn(); |
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131 |
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132 for (int i = (theOperations.size() - 1); i > -1; i--) { |
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133 TxnOp myOp = (TxnOp) theOperations.get(i); |
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134 myOp.restore(this); |
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135 } |
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136 |
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137 // myTxn.commit(); |
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138 } |
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139 |
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140 int myStatus; |
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141 |
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142 synchronized(this) { |
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143 if (theState == TransactionConstants.VOTING) { |
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144 theState = TransactionConstants.PREPARED; |
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145 } |
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146 |
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147 /* |
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148 The state may not have been ACTIVE, we might already have |
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149 been prepared or even got to commited/aborted and we need to |
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150 reflect that in the status we return. |
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151 */ |
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152 myStatus = theState; |
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153 |
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154 } |
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155 |
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156 return myStatus; |
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157 } |
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158 |
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159 void commit() |
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160 throws UnknownTransactionException, IOException { |
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161 |
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162 synchronized(this) { |
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163 if (theState != TransactionConstants.PREPARED) { |
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164 TxnManager.theLogger.log(Level.SEVERE, |
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165 "Txn not prepared before commit"); |
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166 throw new UnknownTransactionException(); |
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167 } |
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168 |
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169 /* |
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170 * We can afford to set the state beforehand because if this doesn't |
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171 * work we have serious problems and it's very unlikely a second attempt |
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172 * will succeed/do any good. |
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173 */ |
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174 theState = TransactionConstants.COMMITTED; |
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175 |
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176 /* |
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177 * Having changed the state we can be sure no one else will do the |
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178 * same thing again and it's better to not hold the lock across the |
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179 * below which might require I/O |
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180 */ |
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181 } |
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182 |
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183 /* |
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184 * MUST BE DONE IN REVERSE ORDER - WE WANT A TAKE TO BE APPLIED |
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185 * BEFORE WE HIT THE PREVIOUS WRITE. THIS ALLOWS US TO GENERATE |
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186 * APPROPRIATE EVENTS FOR WRITES READY FOR NOTIFY - i.e. we |
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187 * want the disk system to be aware that something has been |
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188 * deleted so that we can test that state and abandon generating |
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189 * a write event in those cases. This saves adding code/structure |
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190 * to search other operations to verify whether a write generates |
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191 * an event or not. |
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192 */ |
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193 |
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194 // StringBuffer myTxn = new StringBuffer(theId + " "); |
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195 |
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196 for (int i = (theOperations.size() - 1); i > -1; i--) { |
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197 TxnOp myOp = (TxnOp) theOperations.get(i); |
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198 myOp.commit(this); |
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199 |
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200 // myTxn = myTxn.append(myOp.toString() + " "); |
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201 } |
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202 |
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203 // TxnManager.theLogger.log(Level.INFO, myTxn.toString()); |
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204 } |
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205 |
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206 void abort() |
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207 throws UnknownTransactionException, IOException { |
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208 |
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209 synchronized(this) { |
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210 /* |
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211 Transaction pinger may attempt abort on a just finalized transaction |
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212 cos the transaction manager has forgotten about it. We need to |
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213 handle that by refusing to abort when we're finalized (committed |
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214 or aborted). |
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215 */ |
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216 if ((theState == TransactionConstants.COMMITTED) || |
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217 (theState == TransactionConstants.ABORTED)) { |
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218 TxnManager.theLogger.log(Level.SEVERE, |
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219 "Txn already finalized"); |
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220 throw new UnknownTransactionException(); |
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221 } |
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222 |
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223 /* |
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224 * We can afford to set the state beforehand because if this doesn't |
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225 * work we have serious problems and it's very unlikely a second attempt |
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226 * will succeed/do any good. |
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227 */ |
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228 theState = TransactionConstants.ABORTED; |
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229 |
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230 /* |
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231 * Having changed the state we can be sure no one else will do the |
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232 * same thing again and it's better to not hold the lock across the |
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233 * below which might require I/O |
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234 */ |
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235 } |
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236 |
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237 Iterator myOps = theOperations.iterator(); |
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238 |
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239 // No events generated so we can use whatever order we like |
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240 while (myOps.hasNext()) { |
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241 TxnOp myOp = (TxnOp) myOps.next(); |
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242 myOp.abort(this); |
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243 } |
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244 } |
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245 |
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246 public boolean isIdentity() { |
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247 return nonDestructive; |
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248 } |
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249 |
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250 public boolean isNull() { |
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251 return theId.isNull(); |
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252 } |
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253 |
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254 public boolean hasNoOps() { |
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255 return (theOperations.size() == 0); |
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256 } |
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257 |
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258 public String toString() { |
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259 StringBuffer myOps = new StringBuffer(); |
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260 |
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261 for (int i = 0; i < theOperations.size(); i++) { |
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262 // For the first operation, we adopt the time of the |
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263 // enclosing command so drop the hyphen |
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264 if (i == 0) |
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265 myOps.append(" " + theOperations.get(i).toString() + " : " + |
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266 theId + "\n"); |
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267 else |
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268 myOps.append("- : " + theOperations.get(i).toString() + " : " + |
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269 theId + "\n"); |
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270 } |
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271 |
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272 return myOps.toString(); |
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273 } |
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274 |
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275 void doFinalize() { |
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276 /* |
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277 * Signal any associated listeners - we only want to do this during live |
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278 * operations |
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279 */ |
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280 QueueEvent myEvent = |
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281 new QueueEvent(QueueEvent.TRANSACTION_ENDED, |
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282 this, null); |
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283 EventQueue.get().add(myEvent); |
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284 } |
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285 |
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286 public void test() throws TransactionException { |
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287 synchronized (this) { |
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288 if (theState != TransactionConstants.ACTIVE) { |
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289 TxnManager.theLogger.log(Level.SEVERE, |
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290 "Txn not in active state at addOp"); |
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291 throw new TransactionException("Transaction no longer active"); |
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292 } |
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293 } |
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294 } |
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295 } |