Mercurial > hg > blitz_stable
annotate src/org/dancres/blitz/disk/DiskTxn.java @ 32:243c74d599bf
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author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 12 Jun 2010 10:41:47 +0100 |
parents | 3dc0c5604566 |
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rev | line source |
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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 } |