Mercurial > hg > blitz_stable

annotate src/org/dancres/blitz/entry/EntrySleeveImpl.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
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1 package org.dancres.blitz.entry;
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2
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3 import java.util.logging.Logger;
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4
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5 import org.dancres.struct.LinkedInstance;
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6
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7 import org.dancres.blitz.mangler.MangledEntry;
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8 import org.dancres.blitz.mangler.EntryMangler;
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9
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10 import org.dancres.blitz.oid.OID;
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11 import org.dancres.blitz.oid.OIDFactory;
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12
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13 import org.dancres.blitz.cache.Identifiable;
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14 import org.dancres.blitz.cache.Identifier;
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15
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16 import org.dancres.blitz.test.DummyEntry;
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17
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18 import org.dancres.blitz.Logging;
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19 import org.dancres.blitz.entry.ci.CacheIndexer;
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20
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21 /**
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22 <p> The in-memory representation of an Entry (as in record sleeve) -
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23 includes transient caching state as well as persistent information. </p>
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24
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25 <p> Call flatten to render an instance into a byte[] suitable for disk
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26 storage and invoke the constructor EntrySleeveImpl(byte[]) to reconstitute
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27 the flattened form from disk. </p>
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28
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29 <p>We track dirty state explicitly on the sleeve and it's managed in the
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30 layers above the WriteBuffer which only concerns itself with PersistentEntry
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31 instances and getting them to disk.</p>
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32 */
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33 final class EntrySleeveImpl implements EntrySleeve, Identifiable,
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34 LinkedInstance {
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35
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36 static final Logger theLogger =
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37 Logging.newLogger("org.dancres.blitz.entry.EntrySleeveImpl");
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38
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39 private transient SleeveState theState = new SleeveState();
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40
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41 private transient LinkedInstance theNext;
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42 private transient LinkedInstance thePrev;
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43
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44 private transient PersistentEntry theEntry;
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45
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46 private transient boolean isDirty;
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47
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48 private EntrySleeveImpl() {
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49 }
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50
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51 /**
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52 Use this constructor ONLY for EntrySleeveImpls that have never been
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53 written to disk. Typically this constructor is called for
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54 space::write() or recovery processing.
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55 */
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56 EntrySleeveImpl(OID anId, MangledEntry anEntry, long anExpiry) {
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57 theEntry = new PersistentEntry(anId, anEntry, anExpiry);
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58 getState().set(SleeveState.NOT_ON_DISK | SleeveState.PINNED);
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59 }
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60
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61 /**
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62 Take a byte[] as returned by flatten and re-constitute an
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63 EntrySleeveImpl from it. Use this constructor for rebuilding state
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64 saved to disk.
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65 */
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66 EntrySleeveImpl(byte[] aBytes) {
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67 theEntry = new PersistentEntry(aBytes);
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68 }
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69
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70 EntrySleeveImpl(PersistentEntry anEntry) {
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71 theEntry = anEntry;
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72 }
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73
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74 /**
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75 @return a deep duplicate of this EntrySleeveImpl, including current
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76 SleeveState
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77 */
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78 EntrySleeveImpl duplicate() {
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79 EntrySleeveImpl myDupe = new EntrySleeveImpl();
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80
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81 // Copy status flags
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82 myDupe.getState().set(getState().get());
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83
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84 myDupe.theEntry = new PersistentEntry(theEntry.flatten());
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85
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86 return myDupe;
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87 }
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88
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89 byte[] flatten() {
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90 return theEntry.flatten();
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91 }
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92
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93 SleeveState getState() {
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94 synchronized(this) {
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95 if (theState == null)
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96 theState = new SleeveState();
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97 }
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98
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99 return theState;
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100 }
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101
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102 public boolean isDeleted() {
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103 return getState().test(SleeveState.DELETED);
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104 }
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105
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106 boolean hasExpired(long aTime) {
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107 return theEntry.hasExpired(aTime);
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108 }
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109
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110 void setExpiry(long anExpiry) {
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111 theEntry.setExpiry(anExpiry);
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112 }
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113
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114 long getExpiry() {
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115 return theEntry.getExpiry();
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116 }
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117
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118 public int getHashCodeForField(int anOffset) {
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119 return theEntry.getHashCodeForField(anOffset);
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120 }
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121
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122 byte[] getKey() {
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123 return theEntry.getKey();
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124 }
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125
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126 public void setNext(LinkedInstance anInstance) {
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127 theNext = anInstance;
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128 }
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129
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130 public void setPrev(LinkedInstance anInstance) {
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131 thePrev = anInstance;
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132 }
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133
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134 public LinkedInstance getNext() {
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135 return theNext;
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136 }
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137
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138 public LinkedInstance getPrev() {
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139 return thePrev;
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140 }
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141
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Dan Creswell <dan.creswell@gmail.com>
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142 /**
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143 Ensure we only ever hand out one ID whilst we are cached so, should
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144 someone wish to WeakRef the ID, it can. Id will be re-constituted
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145 from key only when we've been reloaded from disk causing theId to
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146 be null and flatten to have converted theId to a key made of bytes held
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147 in theKey.
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148 */
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149 public OID getOID() {
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150 return theEntry.getOID();
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151 }
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152
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153 public Identifier getId() {
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154 return getOID();
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155 }
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156
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157 public String getType() {
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158 return getEntry().getType();
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159 }
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160
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161 public MangledEntry getEntry() {
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162 return theEntry.getEntry();
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163 }
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164
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165 public boolean equals(Object anObject) {
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166 if (anObject instanceof EntrySleeveImpl) {
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167 EntrySleeveImpl myOther = (EntrySleeveImpl) anObject;
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168
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169 return myOther.getOID().equals(getOID());
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170 }
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171
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172 return false;
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173 }
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174
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175 public String toString() {
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176 return "ES: " + getOID() + " - state: " + getState().toString();
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177
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178 }
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179
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180 void markDirty() {
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181 isDirty = true;
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182
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183 if (isDeleted()) {
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184 CacheIndexer.getIndexer(getType()).flushed(this);
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185 }
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186 }
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187
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188 void clearDirty() {
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189 isDirty = false;
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190 }
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191
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192 boolean isDirty() {
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193 return isDirty;
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194 }
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195
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196 public static void main(String args[]) {
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197 try {
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198 EntryMangler myMangler = EntryMangler.getMangler();
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199
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200 DummyEntry myEntry = new DummyEntry("rhubarb");
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201
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202 MangledEntry myMangled = myMangler.mangle(myEntry);
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203
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204 EntrySleeveImpl mySleeve =
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205 new EntrySleeveImpl(OIDFactory.newOID(10, 21), myMangled,
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206 Long.MAX_VALUE);
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207
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208 byte[] myFlatten = mySleeve.flatten();
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209
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210 mySleeve = new EntrySleeveImpl(myFlatten);
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211
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212 System.out.println(mySleeve.getEntry());
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213
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214 System.out.println(mySleeve.getOID());
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215
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diff changeset
216 mySleeve = new EntrySleeveImpl(myFlatten);
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217
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218 mySleeve = mySleeve.duplicate();
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219
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220 myFlatten = mySleeve.flatten();
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221
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diff changeset
222 mySleeve = new EntrySleeveImpl(myFlatten);
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223
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224 System.out.println(mySleeve.getEntry());
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225
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226 System.out.println(mySleeve.getOID());
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227
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228 } catch (Exception anE) {
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229 anE.printStackTrace(System.err);
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Dan Creswell <dan.creswell@gmail.com>
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230 }
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231 }
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232
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Dan Creswell <dan.creswell@gmail.com>
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233 PersistentEntry getPersistentRep() {
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234 return theEntry;
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235 }
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Dan Creswell <dan.creswell@gmail.com>
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236 }