Mercurial > hg > blitz_stable

annotate src/org/dancres/blitz/disk/DiskTxn.java @ 8:fa7203ea1622

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Remove some dead code (Dave Brosius)
author Dan Creswell <dan.creswell@gmail.com>
date Sat, 23 May 2009 11:27:41 +0100
parents 3dc0c5604566
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
0
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1 package org.dancres.blitz.disk;
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2
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3 import java.io.IOException;
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4
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5 import java.util.Stack;
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6 import java.util.logging.Level;
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7
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8 import com.sleepycat.je.Transaction;
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9 import com.sleepycat.je.DatabaseException;
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10 import com.sleepycat.je.Database;
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11
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12 import EDU.oswego.cs.dl.util.concurrent.LockReleaser;
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13
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14 /**
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15 Disk operations are encapsulated in transactions for the purposes of
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16 recovery etc. DiskTxn represents such transactions. No DiskTxn means
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17 no disk update.
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18 */
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19 public class DiskTxn {
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20 private static ThreadLocal ACTIVE_TXN = new ThreadLocal();
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21
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22 private Transaction theTxn;
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23
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24 private boolean amStandalone = false;
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25
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26 private DiskTxn(Transaction aTxn) {
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27 theTxn = aTxn;
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28 }
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29
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30 private DiskTxn(Transaction aTxn, boolean isStandalone) {
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31 theTxn = aTxn;
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32 amStandalone = isStandalone;
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33 }
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34
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35 /**
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36 Create a new txn and make it part of the current thread's context.
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37 <B>Warning</B> if there's another Txn already associated with this
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38 thread (i.e. a non-standalone txn) then it will be overwritten by
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39 this one with the resultant loss of the old transaction which will
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40 remain open forever - this would be bad! Under circumstances where
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41 it's necessary to nest txns, use newStandlone().
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42 */
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43 public static DiskTxn newTxn() throws IOException {
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44 Transaction myDbTxn;
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45
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46 try {
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47 myDbTxn = Disk.newTxn();
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48 } catch (DatabaseException aDbe) {
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49 Disk.theLogger.log(Level.SEVERE, "Got DatabaseException", aDbe);
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50 throw new IOException("DatabaseException");
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51 }
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52
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53 DiskTxn myTxn = new DiskTxn(myDbTxn);
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54
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55 ACTIVE_TXN.set(myTxn);
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56
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57 return myTxn;
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58 }
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59
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60 /**
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61 Create a new txn but don't make it a part of the current thread's
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62 context.
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63 */
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64 public static DiskTxn newStandalone() throws IOException {
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65 Transaction myDbTxn;
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66
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67 try {
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68 myDbTxn = Disk.newTxn();
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69 } catch (DatabaseException aDbe) {
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70 Disk.theLogger.log(Level.SEVERE, "Got DatabaseException", aDbe);
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71 throw new IOException("DatabaseException");
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72 }
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73
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74 DiskTxn myTxn = new DiskTxn(myDbTxn, true);
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75
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76 return myTxn;
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77 }
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78
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79 /**
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80 If you choose to use a non-blocking transaction, you must be prepared
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81 to handle (for Db) <code>DatabaseException</code> with an errno of
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82 <code>Db.DB_LOCK_NOTGRANTED</code> during any operations performed under
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83 that transaction. This breaks encapsulation of Db a little.
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84 Note that Db documentation for 4.1.25 would lead a programmer to
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85 believe they need to handle DbLockNotGrantedException - unfortunately,
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86 that never seems to be thrown - sigh.
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87
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88 @todo Fix API leakage.
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89 */
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90 public static DiskTxn newNonBlockingStandalone() throws IOException {
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91 Transaction myDbTxn;
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92
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93 try {
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94 myDbTxn = Disk.newNonBlockingTxn();
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95 } catch (DatabaseException aDbe) {
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96 Disk.theLogger.log(Level.SEVERE, "Got DatabaseException", aDbe);
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97 throw new IOException("DatabaseException");
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98 }
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99
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100 DiskTxn myTxn = new DiskTxn(myDbTxn, true);
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101
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102 return myTxn;
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103 }
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104
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105 public static DiskTxn getActiveTxn() {
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106 return (DiskTxn) ACTIVE_TXN.get();
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107 }
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108
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109 public static Transaction getActiveDbTxn() {
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110 return getActiveTxn().getDbTxn();
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111 }
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112
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113 public Transaction getDbTxn() {
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114 return theTxn;
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115 }
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116
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117 /**
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118 Commit the transaction with no forced logging. If you want forced
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119 logging invoke <code>commit(true)</code>.
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120 */
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121 public void commit() throws IOException {
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122 commit(false);
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123 }
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124
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125 public void commit(boolean shouldSync) throws IOException {
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126 try {
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127 if (shouldSync)
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128 theTxn.commitSync();
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129 else
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130 theTxn.commitNoSync();
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131 } catch (DatabaseException aDbe) {
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132 Disk.theLogger.log(Level.SEVERE, "Got DatabaseException", aDbe);
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133 throw new IOException("DatabaseException");
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134 }
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135
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136 release();
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137
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138 if (!amStandalone)
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139 ACTIVE_TXN.set(null);
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140 }
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141
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142 public void abort() throws IOException {
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143 try {
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144 theTxn.abort();
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145 } catch (DatabaseException aDbe) {
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146 Disk.theLogger.log(Level.SEVERE, "Got DatabaseException", aDbe);
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147 throw new IOException("DatabaseException");
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148 }
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149
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150 release();
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151
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152 if (!amStandalone)
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153 ACTIVE_TXN.set(null);
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154 }
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155
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156 private void release() {
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157 }
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158 }