Mercurial > hg > blitz_stable

annotate src/org/dancres/blitz/entry/PersistentEntry.java @ 0:3dc0c5604566

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Initial checkin of blitz 2.0 fcs - no installer yet.
author Dan Creswell <dan.creswell@gmail.com>
date Sat, 21 Mar 2009 11:00:06 +0000
parents
children
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0
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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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 }