Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/txn/TxnId.java @ 22:b7e52953b7a6
Add some cache/memory statistics to help spot potential exhaustion and other tuning issues.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Fri, 28 Aug 2009 17:23:33 +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.Serializable; |
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4 import java.io.IOException; |
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5 |
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6 import java.rmi.RemoteException; |
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7 import java.rmi.MarshalledObject; |
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8 |
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9 import java.util.Map; |
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10 import java.util.HashMap; |
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11 |
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12 import net.jini.security.ProxyPreparer; |
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13 |
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14 import net.jini.core.transaction.server.TransactionManager; |
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15 import net.jini.core.transaction.TransactionException; |
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16 |
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17 import net.jini.config.ConfigurationException; |
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18 |
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19 import org.dancres.blitz.entry.OpInfo; |
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20 |
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21 import org.dancres.blitz.config.ConfigurationFactory; |
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22 |
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23 /** |
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24 <p> A reference to transactional state being held within the transaction |
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25 manager. </p> |
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26 |
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27 <p> This class uses txnPreparer to do initial preparation of the |
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28 passed RemoteEventListener when constructed from scratch (i.e. it's a new |
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29 registration). It uses recoveredTxnPreparer in those cases where it |
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30 has been de-serialized from storage and is about to be used for the first |
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31 time post a restart </p> |
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32 */ |
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33 public final class TxnId implements Serializable { |
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34 private static final ProxyPreparer RECOVERY_PREPARER; |
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35 private static final ProxyPreparer PREPARER; |
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36 |
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37 static { |
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38 try { |
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39 RECOVERY_PREPARER = |
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40 ConfigurationFactory.getPreparer("recoveredTxnPreparer"); |
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41 |
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42 PREPARER = |
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43 ConfigurationFactory.getPreparer("txnPreparer"); |
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44 } catch (ConfigurationException aCE) { |
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45 throw new RuntimeException("TxnId has problems with preparers", |
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46 aCE); |
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47 } |
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48 } |
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49 |
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50 private MarshalledObject theMarshalledMgr; |
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51 private long theId; |
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52 |
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53 private transient TransactionManager theManager; |
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54 private transient boolean isPrepared; |
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55 |
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56 private static final LocalTxnManager LOCAL_TXN_MGR = |
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57 new LocalTxnManager(); |
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58 |
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59 private static final Map theMarshalledTxnMgrCache = new HashMap(); |
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60 |
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61 /** |
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62 Repeatedly marshalling the same txn mgr for writing to disk and |
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63 such like is costly so we marshall them once and then cache them |
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64 forever on the basis that we'll never see enough transaction manager |
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65 refs to make the memory consumption substantial |
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66 |
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67 @todo Broken references may be a problem.... |
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68 */ |
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69 private static MarshalledObject getMarshalledMgr(TransactionManager aMgr) |
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70 throws RemoteException { |
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71 |
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72 try { |
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73 synchronized(theMarshalledTxnMgrCache) { |
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74 MarshalledObject myMarshalledMgr = |
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75 (MarshalledObject) theMarshalledTxnMgrCache.get(aMgr); |
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76 |
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77 if (myMarshalledMgr == null) { |
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78 myMarshalledMgr = new MarshalledObject(aMgr); |
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79 theMarshalledTxnMgrCache.put(aMgr, myMarshalledMgr); |
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80 } |
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81 |
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82 return myMarshalledMgr; |
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83 } |
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84 } catch (IOException anIOE) { |
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85 throw new RemoteException("Failed to marshall txnmgr", anIOE); |
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86 } |
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87 |
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88 } |
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89 |
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90 static TxnId newNullTxn() throws RemoteException { |
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91 return new TxnId(LOCAL_TXN_MGR.nextId()); |
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92 } |
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93 |
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94 /** |
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95 Only to be used for local(null) transactions. That's because we do |
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96 no preparation on the txn manager reference (there's no point). |
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97 */ |
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98 private TxnId(long anId) throws RemoteException { |
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99 theManager = LOCAL_TXN_MGR; |
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100 theMarshalledMgr = null; |
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101 isPrepared = true; |
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102 theId = anId; |
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103 } |
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104 |
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105 /** |
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106 Use this for transactions which have a remote transaction manager |
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107 */ |
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108 TxnId(TransactionManager aMgr, long anId) throws RemoteException { |
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109 theId = anId; |
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110 |
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111 theManager = (TransactionManager) PREPARER.prepareProxy(aMgr); |
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112 |
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113 theMarshalledMgr = getMarshalledMgr(aMgr); |
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114 |
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115 isPrepared = true; |
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116 } |
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117 |
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118 boolean isNull() { |
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119 try { |
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120 return (getManager() instanceof LocalTxnManager); |
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121 } catch (RemoteException anRE) { |
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122 // This will only happen if we've tried to unpack a remote |
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123 // object reference which implicitly means it's not null |
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124 // |
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125 return false; |
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126 } |
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127 } |
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128 |
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129 public synchronized TransactionManager getManager() |
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130 throws RemoteException { |
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131 |
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132 // This flag is only set in the constructor for non-null txns or by us. |
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133 if (!isPrepared) { |
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134 Object myManager = null; |
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135 |
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136 try { |
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137 // Only null if it was a local txn mgr..... |
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138 // |
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139 if (theMarshalledMgr == null) |
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140 myManager = LOCAL_TXN_MGR; |
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141 else { |
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142 myManager = theMarshalledMgr.get(); |
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143 myManager = RECOVERY_PREPARER.prepareProxy(myManager); |
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144 } |
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145 } catch (IOException anIOE) { |
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146 throw new RemoteException("Failed to unmarshall txnmgr", |
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147 anIOE); |
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148 } catch (ClassNotFoundException aCNFE) { |
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149 throw new RemoteException("Failed to unmarshall txnmgr", |
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150 aCNFE); |
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151 } |
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152 |
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153 theManager = (TransactionManager) myManager; |
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154 isPrepared = true; |
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155 } |
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156 |
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157 return theManager; |
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158 } |
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159 |
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160 public long getId() { |
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161 return theId; |
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162 } |
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163 |
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164 public String toString() { |
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165 try { |
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166 return getManager() + "->" + theId; |
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167 } catch (RemoteException anRE) { |
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168 return "Broken_Codebase->" + theId; |
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169 } |
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170 } |
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171 |
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172 public boolean equals(Object anObject) { |
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173 if (anObject instanceof TxnId) { |
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174 TxnId myOther = (TxnId) anObject; |
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175 |
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176 if (myOther.theId != theId) |
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177 return false; |
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178 |
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179 try { |
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180 TransactionManager myMgr = getManager(); |
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181 TransactionManager myOtherMgr = myOther.getManager(); |
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182 |
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183 return myMgr.equals(myOtherMgr); |
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184 } catch (RemoteException anRE) { |
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185 // Likely to happen if codebase of txnmgr ref is broken |
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186 return false; |
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187 } |
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188 } |
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189 |
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190 return false; |
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191 } |
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192 |
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193 public int hashCode() { |
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194 return (int) (theId ^ (theId >>> 32)); |
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195 } |
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196 } |
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197 |