Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/entry/PersistentEntry.java @ 0:3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
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0
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1 package org.dancres.blitz.entry; |
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2 |
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3 import java.util.logging.Level; |
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4 |
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5 import org.dancres.blitz.mangler.MangledEntry; |
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6 import org.dancres.blitz.oid.OIDFactory; |
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7 import org.dancres.blitz.oid.OID; |
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8 import org.dancres.util.ObjectTransformer; |
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9 import org.dancres.util.BytePacker; |
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10 |
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11 /** |
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12 */ |
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13 public class PersistentEntry { |
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14 private static final int EXPIRY_LENGTH = 8; |
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15 |
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16 private static final int HASH_COUNT_LENGTH = 4; |
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17 |
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18 /* |
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19 All disk-structures are kept "simple" - this removes the need for |
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20 costly (in terms of time to do it and space on disk) serialization |
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21 */ |
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22 private byte[] theEntryBytes; |
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23 private long theExpiry; |
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24 private byte[] theKey; |
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25 private byte[] theHashCodes; |
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26 |
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27 private transient MangledEntry theEntry; |
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28 private transient OID theId; |
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29 |
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30 PersistentEntry(OID anId, MangledEntry anEntry, long anExpiry) { |
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31 theEntry = anEntry; |
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32 theId = anId; |
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33 theExpiry = anExpiry; |
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34 } |
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35 |
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36 PersistentEntry(byte[] aBytes) { |
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37 BytePacker myPacker = BytePacker.getMSBPacker(aBytes); |
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38 |
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39 theExpiry = myPacker.getLong(0); |
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40 theKey = myPacker.getArray(EXPIRY_LENGTH, OIDFactory.KEY_SIZE); |
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41 |
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42 int myHashCodesLength = |
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43 myPacker.getInt(EXPIRY_LENGTH + OIDFactory.KEY_SIZE); |
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44 |
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45 theHashCodes = myPacker.getArray(EXPIRY_LENGTH + OIDFactory.KEY_SIZE + |
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46 HASH_COUNT_LENGTH, myHashCodesLength); |
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47 |
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48 int myRemainder = aBytes.length - EXPIRY_LENGTH - OIDFactory.KEY_SIZE - |
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49 myHashCodesLength - HASH_COUNT_LENGTH; |
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50 |
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51 theEntryBytes = myPacker.getArray(EXPIRY_LENGTH + OIDFactory.KEY_SIZE + |
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52 myHashCodesLength + |
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53 HASH_COUNT_LENGTH, |
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54 myRemainder); |
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55 } |
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56 |
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57 /** |
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58 * Convert EntrySleeveImpl into a byte representation suitable for |
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59 * saving to disk. |
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60 */ |
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61 byte[] flatten() { |
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62 if (theEntryBytes == null) { |
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63 try { |
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64 theEntryBytes = ObjectTransformer.toByte(theEntry); |
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65 } catch (Exception anE) { |
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66 EntrySleeveImpl.theLogger.log( |
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67 Level.SEVERE, "Couldn't flatten entry!", anE); |
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68 } |
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69 } |
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70 |
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71 byte[] myArray = new byte[theEntryBytes.length + OIDFactory.KEY_SIZE |
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72 + EXPIRY_LENGTH + HASH_COUNT_LENGTH + |
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73 getHashCodes().length]; |
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74 |
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75 BytePacker myPacker = BytePacker.getMSBPacker(myArray); |
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76 myPacker.putLong(theExpiry, 0); |
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77 myPacker.putArray(getKey(), EXPIRY_LENGTH); |
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78 myPacker.putInt(getHashCodes().length, EXPIRY_LENGTH + |
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79 OIDFactory.KEY_SIZE); |
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80 myPacker.putArray(getHashCodes(), EXPIRY_LENGTH + OIDFactory.KEY_SIZE + |
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81 HASH_COUNT_LENGTH); |
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82 myPacker.putArray(theEntryBytes, EXPIRY_LENGTH + OIDFactory.KEY_SIZE + |
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83 HASH_COUNT_LENGTH + getHashCodes().length); |
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84 |
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85 return myArray; |
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86 } |
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87 |
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88 PersistentEntry duplicate() { |
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89 return new PersistentEntry(getOID(), getEntry(), getExpiry()); |
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90 } |
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91 |
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92 private synchronized byte[] getHashCodes() { |
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93 /* |
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94 Should only happen if we've been newly created and never been |
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95 flattened |
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96 */ |
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97 if (theHashCodes == null) { |
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98 MangledEntry myEntry = getEntry(); |
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99 |
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100 theHashCodes = new byte[myEntry.getFields().length * 4]; |
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101 |
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102 BytePacker myPacker = BytePacker.getMSBPacker(theHashCodes); |
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103 |
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104 for (int i = 0; i < myEntry.getFields().length; i++) { |
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105 myPacker.putInt(myEntry.getField(i).hashCode(), i * 4); |
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106 } |
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107 } |
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108 |
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109 return theHashCodes; |
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110 } |
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111 |
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112 synchronized int getHashCodeForField(int anOffset) { |
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113 BytePacker myPacker = BytePacker.getMSBPacker(getHashCodes()); |
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114 |
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115 return myPacker.getInt(anOffset * 4); |
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116 } |
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117 |
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118 synchronized MangledEntry getEntry() { |
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119 if (theEntry == null) { |
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120 try { |
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121 theEntry = |
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122 (MangledEntry) ObjectTransformer.toObject(theEntryBytes); |
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123 } catch (Exception anE) { |
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124 EntrySleeveImpl.theLogger.log( |
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125 Level.SEVERE, "Couldn't recover entry", anE); |
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126 } |
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127 } |
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128 |
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129 return theEntry; |
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130 } |
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131 |
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132 synchronized byte[] getKey() { |
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133 |
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134 /* |
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135 Should only happen if we've been newly created and never been |
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136 flattened |
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137 */ |
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138 if (theKey == null) |
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139 theKey = OIDFactory.getKey(theId); |
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140 |
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141 return theKey; |
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142 } |
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143 |
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144 synchronized OID getOID() { |
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145 if (theId == null) { |
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146 theId = OIDFactory.newOID(theKey); |
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147 } |
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148 |
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149 return theId; |
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150 } |
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151 |
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152 synchronized boolean hasExpired(long aTime) { |
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153 return (theExpiry < aTime); |
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154 } |
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155 |
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156 synchronized void setExpiry(long anExpiry) { |
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157 theExpiry = anExpiry; |
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158 } |
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159 |
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160 synchronized long getExpiry() { |
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161 return theExpiry; |
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162 } |
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163 } |