Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/SearchVisitorImpl.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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1 package org.dancres.blitz; |
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2 |
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3 import java.io.IOException; |
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4 import java.util.logging.Level; |
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5 import java.util.logging.Logger; |
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6 |
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7 import net.jini.core.transaction.TransactionException; |
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8 import net.jini.space.JavaSpace; |
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9 |
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10 import org.dancres.blitz.entry.*; |
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11 import org.dancres.blitz.mangler.MangledEntry; |
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12 import org.dancres.blitz.notify.EventGenerator; |
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13 import org.dancres.blitz.notify.EventGeneratorState; |
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14 import org.dancres.blitz.notify.EventQueue; |
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15 import org.dancres.blitz.notify.QueueEvent; |
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16 import org.dancres.blitz.oid.OID; |
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17 import org.dancres.blitz.txn.TxnState; |
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18 import org.dancres.blitz.txnlock.LockMgr; |
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19 import org.dancres.blitz.txnlock.TxnLock; |
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20 import org.dancres.blitz.txnlock.TxnLocks; |
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21 import org.dancres.blitz.txnlock.BaulkedParty; |
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22 |
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23 /** |
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24 All search results obtained by the lower layers are offered to a |
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25 SearchVisitor instance which can then determine whether the offered Entry |
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26 is suitable. This includes "deep matching" which requires that we fully |
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27 compare the fields of template to entry. The lower-layers do not perform |
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28 this task - they return the entry's that are a probable match. In |
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29 addition, instances of search visitor check transaction locks etc. which |
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30 the lower layers know nothing about. |
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31 */ |
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32 class SearchVisitorImpl implements SingleMatchTask, |
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33 SearchVisitor { |
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34 |
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35 private static final Logger theLogger = |
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36 Logging.newLogger("org.dancres.blitz.entry.SearchVisitorImpl"); |
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37 |
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38 private MangledEntry theTemplate; |
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39 private TxnState theTxnState; |
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40 private boolean isTaking; |
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41 private int theLockOp; |
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42 |
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43 private EventGeneratorImpl theSearchTask; |
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44 private SearchVisitor theAdapter = new SearchVisitorAdapter(); |
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45 private BaulkedParty theParty; |
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46 |
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47 private CompletionEvent theCompletion; |
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48 |
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49 private boolean needsWakeup = false; |
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50 |
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51 /** |
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52 @param isTake indicates the kind of txn lock we would need to assert |
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53 */ |
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54 SearchVisitorImpl(MangledEntry aTemplate, boolean isTake, |
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55 TxnState aState, VisitorBaulkedPartyFactory aFactory) |
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56 throws IOException { |
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57 |
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58 theTemplate = aTemplate; |
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59 isTaking = isTake; |
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60 theTxnState = aState; |
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61 theLockOp = (isTaking == true) ? TxnLock.DELETE : TxnLock.READ; |
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62 theSearchTask = new EventGeneratorImpl(aTemplate); |
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63 theParty = aFactory.newParty(this); |
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64 SearchTasks.get().add(this); |
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65 EventQueue.get().insert(theSearchTask); |
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66 } |
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67 |
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68 public EventGenerator getSearchTask() { |
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69 return theSearchTask; |
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70 } |
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71 |
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72 public SearchVisitor getVisitor() { |
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73 return theAdapter; |
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74 } |
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75 |
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76 /*********************************************************************** |
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77 * SearchVisitor |
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78 ***********************************************************************/ |
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79 |
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80 /** |
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81 * This is an unfiltered offer method which only checks to see if it can |
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82 * perform an acquire. Actual matching is done in the Adapter class |
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83 * or in the satellite EventGenerator implementation. i.e. By the time |
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84 * we get to this method we need to ensure that matching has been done. |
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85 * |
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86 * @todo Consider re-arranging this method as described in the comment |
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87 * below. |
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88 */ |
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89 public int offer(SearchOffer anOffer) { |
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90 OpInfo myInfo = anOffer.getInfo(); |
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91 |
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92 MangledEntry myEntry = anOffer.getEntry(); |
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93 |
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94 LockMgr myMgr = TxnLocks.getLockMgr(myInfo.getType()); |
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95 TxnLock myLock = myMgr.getLock(myInfo.getOID()); |
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96 |
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97 synchronized (this) { |
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98 |
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99 int myResult; |
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100 |
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101 // Do we need to try and secure this? |
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102 if (haveFinished()) |
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103 return STOP; |
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104 |
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105 VisitorBaulkedPartyFactory.Handback myHandback = |
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106 new VisitorBaulkedPartyFactory.Handback(myInfo.getType(), |
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107 myInfo.getOID(), myEntry); |
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108 |
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109 synchronized (myLock) { |
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110 myResult = myLock.acquire(theTxnState, theLockOp, |
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111 theParty, myHandback, false); |
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112 } |
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113 |
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114 if (myResult == TxnLock.SUCCESS) { |
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115 |
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116 if (theLogger.isLoggable(Level.FINE)) |
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117 theLogger.log(Level.FINE, theTxnState.getId() + |
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118 " Acq: " + |
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119 myInfo + ", " + myLock); |
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120 |
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121 try { |
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122 theTxnState.add(new EntryTxnOp(theLockOp, myInfo, |
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123 myLock)); |
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124 } catch (TransactionException aTE) { |
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125 |
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126 /* |
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127 If we catch a transactionexception here we're dead, |
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128 we will exit with invalid state. If we have the |
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129 lock above we know we have the Entry and no-one |
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130 can remove it from under us. |
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131 |
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132 Once we've locked the entry we're done |
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133 matching because either we will return it |
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134 successfully after tracking our action in the |
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135 transaction or we will blow up on the transaction |
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136 and release the entry lock and return an exception. |
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137 Either way we can stop all searching as soon as |
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138 we have the Entry locked. |
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139 |
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140 Thus we can set theEntry above once we see success |
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141 and then exit the sync block rather than holding |
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142 it whilst we update the transaction. Before |
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143 exiting the sync block we need to check for |
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144 conflict as we do below and set the didconflict |
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145 flag. |
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146 |
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147 Currently we stop searches and wakeup blocked |
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148 threads in getEntry via setStatus thus setting |
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149 theEntry is currently insufficient. However |
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150 it would be safe to modify haveCompleted to also |
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151 include a test for theEntry being set. Note we |
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152 must NEVER use haveCompleted in getEntry() |
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153 as a consequence! |
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154 */ |
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155 myLock.release(theTxnState, theLockOp); |
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156 return sendEvent(new CompletionEvent(aTE)); |
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157 } |
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158 |
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159 if (theLogger.isLoggable(Level.FINE)) |
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160 theLogger.log(Level.FINE, "Succeeded"); |
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161 |
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162 return sendEvent(new CompletionEvent(myEntry)); |
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163 } |
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164 } |
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165 |
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166 return TRY_AGAIN; |
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167 } |
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168 |
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169 public int sendEvent(CompletionEvent anEvent) { |
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170 synchronized (this) { |
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171 if (haveFinished()) |
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172 return STOP; |
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173 |
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174 theCompletion = anEvent; |
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175 |
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176 theSearchTask.taint(); |
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177 SearchTasks.get().remove(this, wasNotSatisfied()); |
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178 |
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179 if (needsWakeup) |
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180 notify(); |
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181 |
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182 return STOP; |
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183 } |
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184 } |
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185 |
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186 /** |
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187 * NEVER, EVER, EVER invoke <code>haveCompleted</code> in this method. |
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188 * <code>haveCompleted</code> is an internal function designed to allow |
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189 * methods to figure out when parallel searching and other operations can |
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190 * safely abort early. |
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191 * |
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192 * This method must _never_ abort early, it must wait until status is set |
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193 * via <code>setStatus</code> - it cannot peek at potentially incomplete |
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194 * status which <code>haveCompleted</code> does. |
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195 */ |
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196 public synchronized MangledEntry getEntry(long aTimeout) |
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197 throws TransactionException, |
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198 InterruptedException { |
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199 |
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200 // We only wait the once because we'll only ever wake from this |
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201 // if there's a result or we timeout |
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202 if (wouldBlock() && (aTimeout != 0)) { |
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203 needsWakeup = true; |
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204 wait(aTimeout); |
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205 needsWakeup = false; |
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206 } |
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207 |
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208 // We're returning - ensure we don't allow any more operations to |
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209 // avoid doing a take we'll never return.... |
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210 sendEvent(CompletionEvent.COMPLETED); |
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211 |
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212 if (theCompletion.getException() != null) |
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213 throw theCompletion.getException(); |
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214 |
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215 return theCompletion.getEntry(); |
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216 } |
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217 |
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218 public synchronized boolean wouldBlock() { |
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219 return (theCompletion == null); |
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220 } |
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221 |
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222 /** |
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223 * NEVER, EVER, EVER invoke <code>haveCompleted</code> unless you are |
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224 * attempting to determine that internal parallel functions |
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225 * such as parallel searching and other operations can |
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226 * safely abort early. |
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227 * |
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228 * When this method returns <code>true</code> it is stating that some |
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229 * thread has determined a final state for this visitor and is in the |
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230 * process of resolving it. |
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231 */ |
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232 private synchronized boolean haveFinished() { |
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233 return (theCompletion != null); |
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234 } |
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235 |
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236 private boolean wasNotSatisfied() { |
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237 return (theCompletion.getEntry() == null); |
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238 } |
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239 |
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240 public boolean isDeleter() { |
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241 return isTaking; |
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242 } |
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243 |
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244 private void resolved() { |
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245 sendEvent(new CompletionEvent(new TransactionException( |
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246 "Transaction completed with operations still outstanding: " + |
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247 (isTaking ? "take" : "read")))); |
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248 } |
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249 |
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250 private class EventGeneratorImpl implements EventGenerator { |
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251 private boolean isTainted = false; |
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252 private MangledEntry theTemplate; |
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253 private OID theOID; |
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254 |
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255 EventGeneratorImpl(MangledEntry aTemplate) { |
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256 theTemplate = aTemplate; |
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257 } |
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258 |
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259 public void assign(OID anOID) { |
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260 theOID = anOID; |
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261 } |
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262 |
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263 public long getStartSeqNum() { |
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264 return 0; |
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265 } |
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266 |
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267 public OID getId() { |
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268 return theOID; |
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269 } |
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270 |
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271 public boolean isPersistent() { |
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272 return false; |
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273 } |
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274 |
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275 public long getSourceId() { |
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276 return 0; |
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277 } |
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278 |
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279 public void taint() { |
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280 synchronized (this) { |
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281 // Tainting can only be done once |
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282 // |
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283 if (isTainted) |
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284 return; |
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285 |
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286 isTainted = true; |
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287 } |
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288 |
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289 try { |
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290 EventQueue.get().kill(getId()); |
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291 } catch (IOException anIOE) { |
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292 theLogger.log(Level.SEVERE, |
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293 "Encountered IOException during kill", anIOE); |
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294 } |
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295 |
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296 /* |
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297 try { |
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298 Tasks.queue(new CleanTask(getId())); |
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299 } catch (InterruptedException anIE) { |
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300 theLogger.log(Level.WARNING, |
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301 "Failed to lodge cleanup for: " + getId(), anIE); |
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302 } |
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303 */ |
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304 } |
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305 |
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306 private boolean isTainted() { |
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307 synchronized(this) { |
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308 return (isTainted); |
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309 } |
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310 } |
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311 |
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312 public boolean canSee(QueueEvent anEvent, long aTime) { |
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313 if (isTainted()) |
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314 return false; |
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315 |
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316 // Check if it's txn_ended and my txn and call resolved if it is |
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317 if ((anEvent.getType() == QueueEvent.TRANSACTION_ENDED) && |
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318 (theTxnState.getId().equals(anEvent.getTxn().getId()))) { |
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319 resolved(); |
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320 return false; |
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321 } |
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322 |
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323 // We want to see new writes from a transaction |
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324 // |
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325 return (anEvent.getType() == QueueEvent.ENTRY_WRITE); |
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326 } |
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327 |
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328 public boolean matches(MangledEntry anEntry) { |
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329 if (isTainted()) |
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330 return false; |
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331 |
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332 return Types.isSubtype(theTemplate.getType(), anEntry.getType()) && |
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333 theTemplate.match(anEntry); |
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334 } |
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335 |
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336 public boolean renew(long aTime) { |
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337 // Nothing to do as we expire by being tainted by the enclosing |
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338 // class only |
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339 // |
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340 return true; |
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341 } |
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342 |
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343 public void recover(long aSeqNum) { |
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344 // Nothing to do |
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345 } |
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346 |
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347 public long jumpSequenceNumber() { |
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348 return 0; |
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349 } |
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350 |
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351 public long jumpSequenceNumber(long aMin) { |
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352 return 0; |
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353 } |
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354 |
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355 public void ping(QueueEvent anEvent, JavaSpace aSource) { |
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356 if (isTainted()) |
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357 return; |
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358 |
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359 LongtermOffer myOffer = null; |
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360 |
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361 QueueEvent.Context myContext = anEvent.getContext(); |
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362 MangledEntry myEntry = myContext.getEntry(); |
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363 OID myOID = myContext.getOID(); |
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364 |
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365 try { |
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366 EntryRepository myRepos = |
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367 EntryRepositoryFactory.get().find(myEntry.getType()); |
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368 |
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369 myOffer = myRepos.getOffer(myOID); |
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370 |
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371 if (myOffer == null) |
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372 return; |
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373 |
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374 myOffer.offer(SearchVisitorImpl.this); |
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375 |
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376 } catch (IOException anIOE) { |
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377 // Nothing can be done |
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378 theLogger.log(Level.SEVERE, |
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379 "Encountered IOException during write offer", anIOE); |
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380 } finally { |
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381 if (myOffer != null) { |
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382 try { |
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383 myOffer.release(); |
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384 } catch (IOException anIOE) { |
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385 theLogger.log(Level.SEVERE, |
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386 "Encountered IOException during write offer(release)", |
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387 anIOE); |
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388 } |
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389 } |
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390 } |
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391 } |
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392 |
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393 public EventGeneratorState getMemento() { |
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394 throw new RuntimeException( |
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395 "Shouldn't be happening - we're transient"); |
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396 } |
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397 } |
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398 |
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399 private class SearchVisitorAdapter implements SearchVisitor { |
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400 |
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401 public boolean isDeleter() { |
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402 return SearchVisitorImpl.this.isDeleter(); |
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403 } |
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404 |
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405 public int offer(SearchOffer anOffer) { |
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406 if (theLogger.isLoggable(Level.FINE)) |
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407 theLogger.log(Level.FINE, "Offer"); |
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408 |
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409 if (haveFinished()) { |
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410 if (theLogger.isLoggable(Level.FINE)) |
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411 theLogger.log(Level.FINE, theTxnState.getId() + |
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412 " Have completed"); |
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413 return STOP; |
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414 } |
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415 |
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416 OpInfo myInfo = anOffer.getInfo(); |
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417 |
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418 if (!Types.isSubtype(theTemplate.getType(), myInfo.getType())) { |
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419 if (theLogger.isLoggable(Level.FINE)) |
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420 theLogger.log(Level.FINE, "Not subtype"); |
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421 |
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422 return TRY_AGAIN; |
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423 } |
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424 |
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425 MangledEntry myEntry = anOffer.getEntry(); |
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426 |
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427 if (theTemplate.match(myEntry)) { |
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428 return SearchVisitorImpl.this.offer(anOffer); |
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429 } else |
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430 return TRY_AGAIN; |
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431 } |
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432 } |
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433 } |