Mercurial > hg > blitz_stable

annotate src/org/dancres/blitz/arc/ArcCache.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 b7e52953b7a6
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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 /**
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66 For recovery purposes, we wish to be able to ensure that something
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67 has made it to disk and, if it hasn't, re-insert it to the cache.
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68 This is different from insert which is used for those entries which
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69 we know are not present on disk. We must first check disk and,
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70 if there's no entry, populate the cache with a new one.
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71 */
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72 public RecoverySummary recover(Identifiable anIdentifiable)
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73 throws IOException {
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74
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75 // Try a fetch from disk
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76 Identifiable myIdentifiable = theStore.load(anIdentifiable.getId());
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77
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78 // Did we get it?
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79 if (myIdentifiable == null) {
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80 // No, we need to establish a copy in cache from passed version
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81 return new RecoverySummary(insert(anIdentifiable), false);
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82 } else {
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83 /*
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84 myIdentifiable contains the up-to-date disk image and this
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85 must be inserted into the cache rather than anIdentifiable
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86 which should only be used when the disk image was missing.
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87 */
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88 return new RecoverySummary(find(myIdentifiable.getId(),
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89 myIdentifiable), true);
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90 }
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91 }
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92
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93 /**
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94 <p> We achieve insert by adding a new memory-only entry into
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95 BackingStore using a specific method like prepareToCache(Entry). We
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96 then instruct ArcCache to page-in the Entry which will cause ArcCache to
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97 make room and pull the Entry from the BackingStore which, coveniently,
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98 has the entry waiting in memory. </p>
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99
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100 ONLY call this method for adding Entries which should be treated as
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101 newly written.
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102 */
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103 public CacheBlockDescriptor insert(Identifiable anIdentifiable)
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104 throws IOException {
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105 CacheBlockDescriptor myCBD = find(anIdentifiable.getId(),
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106 anIdentifiable);
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107
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108 theListeners.signal(CacheListenerSet.LOADED, anIdentifiable);
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109
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110 return myCBD;
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111 }
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112
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113 /**
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114 Locate an Identifiable associated with Identifier - loading from
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115 disk if necessary.
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116
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117 @return a CBD with the lock asserted representing the requested entry.
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118 Note that the entry may no longer exist but we allow "non-existence" to
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119 be cached because that may also be significant to some application.
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120 In such cases, this method will return <code>null</code>.
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121 */
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122 public CacheBlockDescriptor find(Identifier anId) throws IOException {
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123 CacheBlockDescriptor myCBD = find(anId, null);
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124
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125 // If Entry isn't present, release CBD and return null to caller.
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126 if (myCBD.isEmpty()) {
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127 myCBD.release();
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128 return null;
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129 } else {
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130 return myCBD;
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131 }
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132 }
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
133
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
134 /**
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
135 @param aPreLoad If the identifiable associated with the identifier is
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
136 not in the cache, make space in the cache and associate aPreLoad with
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
137 the identifier.
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
138
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
139 @return a CBD with the lock asserted representing the requested entry.
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
140 Note that the entry may no longer exist but we allow "non-existence" to
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
141 be cached because that may also be significant to some application.
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
142 In such cases, getContent() will return null and isEmpty will return
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
143 true.
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
144 */
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
145 private CacheBlockDescriptor find(Identifier anId,
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
146 Identifiable aPreLoad)
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
147 throws IOException {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
148
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
149 CacheBlockDescriptor myDesc = null;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
150 boolean needsFetch = false;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
151
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
152 synchronized(this) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
153 myDesc = (CacheBlockDescriptor) theBlockIndex.get(anId);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
154
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
155 try {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
156 // Is it in cache?
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
157 if (myDesc != null) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
158 myDesc.acquire();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
159
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
160 /*
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
161 Consistency check - shouldn't have something in cache
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
162 already when we're pre-loading for insert
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
163
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
164 if (aPreLoad != null)
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
165 theLogger.log(Level.SEVERE, "Hmmm, we're inserting but we appear to have this in cache already :( " + anId + ", " + aPreLoad + ", " + myDesc.getId(), new RuntimeException());
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
166 */
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
167
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
168 switch(myDesc.getWhere()) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
169 case Lru.T1 :
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
170 case Lru.T2 : {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
171 // System.out.println("Cache hit");
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
172
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
173 remove(myDesc);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
174 t2.mruInsert(myDesc);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
175
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
176 break;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
177 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
178
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
179 case Lru.B1 :
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
180 case Lru.B2 : {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
181 /* I/O - no dir change */
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
182 // System.out.println("Cache miss [in dir]");
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
183
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
184 if (myDesc.getWhere() == Lru.B1) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
185 theTargetT1 =
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
186 Math.min(theTargetT1 +
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
187 Math.max(b2.length() /
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
188 b1.length(), 1),
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
189 theCacheSize);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
190 } else {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
191 theTargetT1 =
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
192 Math.max(theTargetT1 -
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
193 Math.max(b1.length() /
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
194 b2.length(), 1),
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
195 0);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
196 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
197
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
198 remove(myDesc);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
199
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
200 // Flush an entry from cache
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
201 replace(); // I/O
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
202
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
203 myDesc.setId(anId);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
204
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
205 t2.mruInsert(myDesc);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
206
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
207 needsFetch = true;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
208 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
209 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
210 } else {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
211 /* I/O - dir updated */
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
212
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
213 // System.out.println("Cache miss");
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
214
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
215 if ((t1.length() + b1.length()) == theCacheSize) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
216 if (t1.length() < theCacheSize) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
217 myDesc = b1.lruRemove();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
218 myDesc.acquire();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
219 replace(); // I/O
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
220 } else {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
221 myDesc = t1.lruRemove();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
222 myDesc.acquire();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
223 destage(myDesc); // I/O
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
224 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
225 theBlockIndex.remove(myDesc.getId());
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
226 } else {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
227 if ((t1.length() + t2.length() + b1.length() +
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
228 b2.length()) >= theCacheSize) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
229 if ((t1.length() + t2.length() + b1.length() +
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
230 b2.length()) == (2 * theCacheSize)) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
231 myDesc = b2.lruRemove();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
232 myDesc.acquire();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
233 theBlockIndex.remove(myDesc.getId());
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
234 } else {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
235 myDesc =
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
236 new CacheBlockDescriptor();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
237 myDesc.acquire();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
238 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
239
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
240 replace(); // I/O
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
241 } else {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
242 myDesc = new CacheBlockDescriptor();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
243 myDesc.acquire();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
244 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
245 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
246
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
247 myDesc.setId(anId);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
248
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
249 t1.mruInsert(myDesc);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
250
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
251 theBlockIndex.put(anId, myDesc);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
252
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
253 needsFetch = true;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
254 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
255 } catch (InterruptedException anIE) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
256 theLogger.log(Level.SEVERE, "Couldn't lock CDB", anIE);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
257 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
258 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
259
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
260 if (needsFetch) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
261 myDesc.setContent(fetch(anId, aPreLoad));
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
262 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
263
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
264 return myDesc;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
265 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
266
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
267 private void remove(CacheBlockDescriptor aDesc) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
268 switch(aDesc.getWhere()) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
269 case Lru.T1 : {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
270 t1.remove(aDesc);
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Dan Creswell <dan.creswell@gmail.com>
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271 break;
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Dan Creswell <dan.creswell@gmail.com>
parents:
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272 }
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Dan Creswell <dan.creswell@gmail.com>
parents:
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273 case Lru.T2 : {
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
274 t2.remove(aDesc);
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Dan Creswell <dan.creswell@gmail.com>
parents:
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275 break;
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276 }
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
277 case Lru.B1 : {
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
278 b1.remove(aDesc);
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Dan Creswell <dan.creswell@gmail.com>
parents:
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279 break;
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parents:
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280 }
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
281 case Lru.B2 : {
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Dan Creswell <dan.creswell@gmail.com>
parents:
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282 b2.remove(aDesc);
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Dan Creswell <dan.creswell@gmail.com>
parents:
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283 break;
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Dan Creswell <dan.creswell@gmail.com>
parents:
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284 }
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Dan Creswell <dan.creswell@gmail.com>
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285 }
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Dan Creswell <dan.creswell@gmail.com>
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286 }
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287
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Dan Creswell <dan.creswell@gmail.com>
parents:
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288 /**
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Dan Creswell <dan.creswell@gmail.com>
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289 Flush out another CDB if necessary. In the original algorithm, we'd also
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Dan Creswell <dan.creswell@gmail.com>
parents:
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290 need to rip the discarded CBD's cache page and put it in this CDB. But,
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Dan Creswell <dan.creswell@gmail.com>
parents:
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291 our version holds the object directly on the CDB so we don't need to do
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Dan Creswell <dan.creswell@gmail.com>
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292 this. Note we're flushing out a CDB in t1 or t2 which means we're
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Dan Creswell <dan.creswell@gmail.com>
parents:
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293 removing an entry from the cache to make room for the new one.
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Dan Creswell <dan.creswell@gmail.com>
parents:
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294 The one we're making room for could be a phantom hit or a real miss.
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Dan Creswell <dan.creswell@gmail.com>
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295 */
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Dan Creswell <dan.creswell@gmail.com>
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296 private void replace() throws IOException {
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Dan Creswell <dan.creswell@gmail.com>
parents:
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297 CacheBlockDescriptor myDesc;
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Dan Creswell <dan.creswell@gmail.com>
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298
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Dan Creswell <dan.creswell@gmail.com>
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299 try {
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Dan Creswell <dan.creswell@gmail.com>
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300 if (t1.length() >= Math.max(1, theTargetT1)) {
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Dan Creswell <dan.creswell@gmail.com>
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301 myDesc = t1.lruRemove();
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Dan Creswell <dan.creswell@gmail.com>
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302 myDesc.acquire();
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Dan Creswell <dan.creswell@gmail.com>
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303
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Dan Creswell <dan.creswell@gmail.com>
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304 b1.mruInsert(myDesc);
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Dan Creswell <dan.creswell@gmail.com>
parents:
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305 } else {
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
306 myDesc = t2.lruRemove();
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
307 myDesc.acquire();
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Dan Creswell <dan.creswell@gmail.com>
parents:
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308
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Dan Creswell <dan.creswell@gmail.com>
parents:
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309 b2.mruInsert(myDesc);
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Dan Creswell <dan.creswell@gmail.com>
parents:
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310 }
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Dan Creswell <dan.creswell@gmail.com>
parents:
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311
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
312 destage(myDesc);
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Dan Creswell <dan.creswell@gmail.com>
parents:
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313
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
314 myDesc.setContent(null);
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
315
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
316 myDesc.release();
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
317
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
318 } catch (InterruptedException anIE) {
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
319 theLogger.log(Level.SEVERE, "Failed to lock CBD", anIE);
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Dan Creswell <dan.creswell@gmail.com>
parents:
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320 }
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
321 }
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Dan Creswell <dan.creswell@gmail.com>
parents:
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322
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
323 private void destage(CacheBlockDescriptor aCBD) throws IOException {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
324 // System.out.println("Flush: " + aCBD.getId());
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
325
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
326 theStore.save(aCBD.getContent());
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
327 }
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
328
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
329 public void dump() {
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
330 dump(t1);
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
331 dump(t2);
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
332 dump(b1);
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
333 dump(b2);
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
334 }
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
335
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
336 private void dump(Lru anLru) {
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
337 synchronized(anLru) {
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
338 anLru.dump();
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
339 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
340 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
341
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
342 public synchronized void sync() throws IOException {
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
343
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
344 long myStart = 0;
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
345
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
346 if (theLogger.isLoggable(Level.FINE)) {
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
347 theLogger.log(Level.FINE, "Syncing: " + theStore.getName());
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
348
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
349 myStart = System.currentTimeMillis();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
350 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
351
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
352 t1.sync(theStore);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
353 t2.sync(theStore);
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
354
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
355 if (theLogger.isLoggable(Level.FINE)) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
356 long myEnd = System.currentTimeMillis();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
357
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
358 theLogger.log(Level.FINE,
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
359 "Time to scan lists: " + (myEnd - myStart));
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
360 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
361 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
362
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
363 private Identifiable fetch(Identifier anId, Identifiable aPreLoad)
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
364 throws IOException {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
365
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
366 // System.out.println("Fetch: " + anId + ", " + aPreLoad);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
367
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
368 Identifiable myIdent;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
369
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
370 if (aPreLoad != null)
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
371 myIdent = aPreLoad;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
372 else
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
373 myIdent = theStore.load(anId);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
374
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
375 return myIdent;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
376 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
377
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
378 public void forceSync(CacheBlockDescriptor aCBD) throws IOException {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
379 // System.err.println("Expunge");
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
380
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
381 destage(aCBD);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
382
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
383 // System.err.println("Expunge done");
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
384 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
385 }