Mercurial > hg > blitz_stable

annotate src/org/dancres/blitz/txn/TxnId.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.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 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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171
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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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;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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178
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179 try {
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180 TransactionManager myMgr = getManager();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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181 TransactionManager myOtherMgr = myOther.getManager();
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182
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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183 return myMgr.equals(myOtherMgr);
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184 } catch (RemoteException anRE) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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185 // Likely to happen if codebase of txnmgr ref is broken
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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186 return false;
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parents:
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187 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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188 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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189
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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190 return false;
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191 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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192
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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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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parents:
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196 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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197