Mercurial > hg > blitz_stable
annotate src/org/dancres/blitz/arc/ArcCache.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 | b7e52953b7a6 |
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rev | line source |
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0
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1 package org.dancres.blitz.arc; |
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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.Map; |
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6 import java.util.TreeMap; |
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7 import java.util.ArrayList; |
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8 import java.util.HashMap; |
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9 |
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10 import java.util.logging.Logger; |
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11 import java.util.logging.Level; |
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12 |
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13 import org.dancres.blitz.Logging; |
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14 import org.dancres.blitz.entry.ci.CacheIndexer; |
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15 |
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16 import org.dancres.blitz.cache.Identifiable; |
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17 import org.dancres.blitz.cache.Identifier; |
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18 import org.dancres.blitz.cache.Cache; |
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19 import org.dancres.blitz.cache.CacheListener; |
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20 import org.dancres.blitz.cache.CacheListenerSet; |
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21 |
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22 /** |
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23 A cache which implements ARC (see "ARC: A Self-Tuning, Low Overhead |
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24 Replacement Cache" in USENIX FAST '03) or, try, |
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25 <a href="http://citeseer.nj.nec.com/megiddo03arc.html"> CiteSeer</a>. <p> |
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26 */ |
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27 public class ArcCache implements Cache { |
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28 static Logger theLogger = |
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29 Logging.newLogger("org.dancres.blitz.arc.cache"); |
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30 /** |
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31 Used for rapid location of a relevant CBD in memory - saves us scanning |
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32 lists. |
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33 */ |
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34 private Map theBlockIndex = new HashMap(); |
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35 |
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36 private Lru t1 = new Lru(Lru.T1); |
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37 private Lru t2 = new Lru(Lru.T2); |
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38 private Lru b1 = new Lru(Lru.B1); |
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39 private Lru b2 = new Lru(Lru.B2); |
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40 |
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41 private int theTargetT1; |
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42 |
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43 /** |
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44 Variable <i>c</i> in the ARC algorithmic description |
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45 */ |
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46 private int theCacheSize; |
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47 |
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48 private BackingStore theStore; |
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49 |
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50 private CacheListenerSet theListeners = new CacheListenerSet(); |
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51 |
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52 public ArcCache(BackingStore aStore, int aCacheSize) { |
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53 theStore = aStore; |
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54 theCacheSize = aCacheSize; |
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55 } |
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56 |
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57 public void add(CacheListener aListener) { |
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58 theListeners.add(aListener); |
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59 } |
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60 |
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61 public int getSize() { |
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62 return theCacheSize; |
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63 } |
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64 |
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65 public int getActiveSize() { |
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66 int mySize; |
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67 |
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68 synchronized(this) { |
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69 mySize = theBlockIndex.size(); |
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70 } |
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71 |
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72 return mySize >> 1; |
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73 } |
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74 |
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75 /** |
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76 For recovery purposes, we wish to be able to ensure that something |
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77 has made it to disk and, if it hasn't, re-insert it to the cache. |
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78 This is different from insert which is used for those entries which |
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79 we know are not present on disk. We must first check disk and, |
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80 if there's no entry, populate the cache with a new one. |
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81 */ |
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82 public RecoverySummary recover(Identifiable anIdentifiable) |
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83 throws IOException { |
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84 |
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85 // Try a fetch from disk |
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86 Identifiable myIdentifiable = theStore.load(anIdentifiable.getId()); |
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87 |
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88 // Did we get it? |
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89 if (myIdentifiable == null) { |
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90 // No, we need to establish a copy in cache from passed version |
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91 return new RecoverySummary(insert(anIdentifiable), false); |
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92 } else { |
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93 /* |
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94 myIdentifiable contains the up-to-date disk image and this |
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95 must be inserted into the cache rather than anIdentifiable |
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96 which should only be used when the disk image was missing. |
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97 */ |
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98 return new RecoverySummary(find(myIdentifiable.getId(), |
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99 myIdentifiable), true); |
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100 } |
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101 } |
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102 |
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103 /** |
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104 <p> We achieve insert by adding a new memory-only entry into |
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105 BackingStore using a specific method like prepareToCache(Entry). We |
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106 then instruct ArcCache to page-in the Entry which will cause ArcCache to |
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107 make room and pull the Entry from the BackingStore which, coveniently, |
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108 has the entry waiting in memory. </p> |
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109 |
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110 ONLY call this method for adding Entries which should be treated as |
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111 newly written. |
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112 */ |
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113 public CacheBlockDescriptor insert(Identifiable anIdentifiable) |
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114 throws IOException { |
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115 CacheBlockDescriptor myCBD = find(anIdentifiable.getId(), |
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116 anIdentifiable); |
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117 |
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118 theListeners.signal(CacheListenerSet.LOADED, anIdentifiable); |
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119 |
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120 return myCBD; |
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121 } |
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122 |
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123 /** |
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124 Locate an Identifiable associated with Identifier - loading from |
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125 disk if necessary. |
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126 |
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127 @return a CBD with the lock asserted representing the requested entry. |
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128 Note that the entry may no longer exist but we allow "non-existence" to |
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129 be cached because that may also be significant to some application. |
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130 In such cases, this method will return <code>null</code>. |
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131 */ |
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132 public CacheBlockDescriptor find(Identifier anId) throws IOException { |
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133 CacheBlockDescriptor myCBD = find(anId, null); |
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134 |
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135 // If Entry isn't present, release CBD and return null to caller. |
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136 if (myCBD.isEmpty()) { |
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137 myCBD.release(); |
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138 return null; |
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139 } else { |
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140 return myCBD; |
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141 } |
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142 } |
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143 |
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144 /** |
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145 @param aPreLoad If the identifiable associated with the identifier is |
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146 not in the cache, make space in the cache and associate aPreLoad with |
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147 the identifier. |
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148 |
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149 @return a CBD with the lock asserted representing the requested entry. |
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150 Note that the entry may no longer exist but we allow "non-existence" to |
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151 be cached because that may also be significant to some application. |
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152 In such cases, getContent() will return null and isEmpty will return |
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153 true. |
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154 */ |
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155 private CacheBlockDescriptor find(Identifier anId, |
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156 Identifiable aPreLoad) |
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157 throws IOException { |
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158 |
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159 CacheBlockDescriptor myDesc = null; |
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160 boolean needsFetch = false; |
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161 |
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162 synchronized(this) { |
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163 myDesc = (CacheBlockDescriptor) theBlockIndex.get(anId); |
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164 |
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165 try { |
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166 // Is it in cache? |
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167 if (myDesc != null) { |
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168 myDesc.acquire(); |
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169 |
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170 /* |
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171 Consistency check - shouldn't have something in cache |
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172 already when we're pre-loading for insert |
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173 |
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174 if (aPreLoad != null) |
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175 theLogger.log(Level.SEVERE, "Hmmm, we're inserting but we appear to have this in cache already :( " + anId + ", " + aPreLoad + ", " + myDesc.getId(), new RuntimeException()); |
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176 */ |
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177 |
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178 switch(myDesc.getWhere()) { |
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179 case Lru.T1 : |
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180 case Lru.T2 : { |
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181 // System.out.println("Cache hit"); |
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182 |
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183 remove(myDesc); |
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184 t2.mruInsert(myDesc); |
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185 |
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186 break; |
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187 } |
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188 |
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189 case Lru.B1 : |
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190 case Lru.B2 : { |
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191 /* I/O - no dir change */ |
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192 // System.out.println("Cache miss [in dir]"); |
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193 |
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194 if (myDesc.getWhere() == Lru.B1) { |
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195 theTargetT1 = |
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196 Math.min(theTargetT1 + |
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197 Math.max(b2.length() / |
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198 b1.length(), 1), |
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199 theCacheSize); |
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200 } else { |
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201 theTargetT1 = |
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202 Math.max(theTargetT1 - |
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203 Math.max(b1.length() / |
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204 b2.length(), 1), |
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205 0); |
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206 } |
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207 |
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208 remove(myDesc); |
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209 |
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210 // Flush an entry from cache |
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211 replace(); // I/O |
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212 |
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213 myDesc.setId(anId); |
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214 |
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215 t2.mruInsert(myDesc); |
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216 |
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217 needsFetch = true; |
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218 } |
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219 } |
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220 } else { |
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221 /* I/O - dir updated */ |
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222 |
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223 // System.out.println("Cache miss"); |
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224 |
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225 if ((t1.length() + b1.length()) == theCacheSize) { |
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226 if (t1.length() < theCacheSize) { |
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227 myDesc = b1.lruRemove(); |
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228 myDesc.acquire(); |
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229 replace(); // I/O |
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230 } else { |
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231 myDesc = t1.lruRemove(); |
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232 myDesc.acquire(); |
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233 destage(myDesc); // I/O |
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234 } |
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235 theBlockIndex.remove(myDesc.getId()); |
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236 } else { |
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237 if ((t1.length() + t2.length() + b1.length() + |
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238 b2.length()) >= theCacheSize) { |
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239 if ((t1.length() + t2.length() + b1.length() + |
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240 b2.length()) == (2 * theCacheSize)) { |
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241 myDesc = b2.lruRemove(); |
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242 myDesc.acquire(); |
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243 theBlockIndex.remove(myDesc.getId()); |
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244 } else { |
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245 myDesc = |
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246 new CacheBlockDescriptor(); |
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247 myDesc.acquire(); |
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248 } |
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249 |
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250 replace(); // I/O |
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251 } else { |
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252 myDesc = new CacheBlockDescriptor(); |
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253 myDesc.acquire(); |
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254 } |
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255 } |
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256 |
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257 myDesc.setId(anId); |
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258 |
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259 t1.mruInsert(myDesc); |
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260 |
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261 theBlockIndex.put(anId, myDesc); |
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262 |
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263 needsFetch = true; |
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264 } |
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265 } catch (InterruptedException anIE) { |
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266 theLogger.log(Level.SEVERE, "Couldn't lock CDB", anIE); |
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267 } |
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268 } |
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269 |
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270 if (needsFetch) { |
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271 myDesc.setContent(fetch(anId, aPreLoad)); |
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272 } |
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273 |
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274 return myDesc; |
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275 } |
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276 |
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277 private void remove(CacheBlockDescriptor aDesc) { |
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278 switch(aDesc.getWhere()) { |
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279 case Lru.T1 : { |
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280 t1.remove(aDesc); |
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281 break; |
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282 } |
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283 case Lru.T2 : { |
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284 t2.remove(aDesc); |
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285 break; |
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286 } |
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287 case Lru.B1 : { |
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288 b1.remove(aDesc); |
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289 break; |
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290 } |
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291 case Lru.B2 : { |
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292 b2.remove(aDesc); |
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293 break; |
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294 } |
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295 } |
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296 } |
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297 |
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298 /** |
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299 Flush out another CDB if necessary. In the original algorithm, we'd also |
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300 need to rip the discarded CBD's cache page and put it in this CDB. But, |
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301 our version holds the object directly on the CDB so we don't need to do |
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302 this. Note we're flushing out a CDB in t1 or t2 which means we're |
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303 removing an entry from the cache to make room for the new one. |
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304 The one we're making room for could be a phantom hit or a real miss. |
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305 */ |
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306 private void replace() throws IOException { |
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307 CacheBlockDescriptor myDesc; |
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308 |
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309 try { |
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310 if (t1.length() >= Math.max(1, theTargetT1)) { |
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311 myDesc = t1.lruRemove(); |
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312 myDesc.acquire(); |
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313 |
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314 b1.mruInsert(myDesc); |
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315 } else { |
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316 myDesc = t2.lruRemove(); |
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317 myDesc.acquire(); |
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318 |
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319 b2.mruInsert(myDesc); |
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320 } |
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321 |
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322 destage(myDesc); |
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323 |
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324 myDesc.setContent(null); |
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325 |
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326 myDesc.release(); |
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327 |
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328 } catch (InterruptedException anIE) { |
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329 theLogger.log(Level.SEVERE, "Failed to lock CBD", anIE); |
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330 } |
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331 } |
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332 |
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333 private void destage(CacheBlockDescriptor aCBD) throws IOException { |
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334 // System.out.println("Flush: " + aCBD.getId()); |
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335 |
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336 theStore.save(aCBD.getContent()); |
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337 } |
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338 |
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339 public void dump() { |
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340 dump(t1); |
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341 dump(t2); |
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342 dump(b1); |
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343 dump(b2); |
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344 } |
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345 |
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346 private void dump(Lru anLru) { |
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347 synchronized(anLru) { |
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348 anLru.dump(); |
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349 } |
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350 } |
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351 |
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352 public synchronized void sync() throws IOException { |
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353 |
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354 long myStart = 0; |
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355 |
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356 if (theLogger.isLoggable(Level.FINE)) { |
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357 theLogger.log(Level.FINE, "Syncing: " + theStore.getName()); |
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358 |
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359 myStart = System.currentTimeMillis(); |
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360 } |
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361 |
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362 t1.sync(theStore); |
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363 t2.sync(theStore); |
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364 |
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365 if (theLogger.isLoggable(Level.FINE)) { |
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366 long myEnd = System.currentTimeMillis(); |
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367 |
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368 theLogger.log(Level.FINE, |
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369 "Time to scan lists: " + (myEnd - myStart)); |
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370 } |
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371 } |
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372 |
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373 private Identifiable fetch(Identifier anId, Identifiable aPreLoad) |
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374 throws IOException { |
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375 |
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376 // System.out.println("Fetch: " + anId + ", " + aPreLoad); |
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377 |
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378 Identifiable myIdent; |
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379 |
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380 if (aPreLoad != null) |
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381 myIdent = aPreLoad; |
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382 else |
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383 myIdent = theStore.load(anId); |
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384 |
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385 return myIdent; |
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386 } |
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387 |
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388 public void forceSync(CacheBlockDescriptor aCBD) throws IOException { |
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389 // System.err.println("Expunge"); |
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390 |
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391 destage(aCBD); |
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392 |
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393 // System.err.println("Expunge done"); |
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394 } |
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395 } |