Mercurial > hg > blitz_stable

annotate src/org/dancres/blitz/entry/RootStorage.java @ 35:6f68e94c1fb8 default tip

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Add CondensedStats monitoring utility, equivalent to vmstat
author Dominic Cleal <dominic-cleal@cdo2.com>
date Thu, 05 Aug 2010 11:07:25 +0100
parents 3dc0c5604566
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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.io.IOException;
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4 import java.io.FileNotFoundException;
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5
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6 import java.util.logging.*;
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7
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8 import java.util.ArrayList;
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9 import org.dancres.blitz.entry.ci.CacheIndexer;
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10
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11 import org.dancres.blitz.mangler.MangledField;
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12 import org.dancres.blitz.mangler.MangledEntry;
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13
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14 import org.dancres.util.BytePacker;
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15
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16 import org.dancres.blitz.Logging;
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17 import org.dancres.blitz.config.EntryConstraints;
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18
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19 import org.dancres.util.ObjectTransformer;
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20
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21 import org.dancres.blitz.meta.RegistryFactory;
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22 import org.dancres.blitz.meta.Registry;
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23
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24 import org.dancres.blitz.disk.DiskTxn;
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25 import org.dancres.blitz.disk.Disk;
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26
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27 import org.dancres.blitz.oid.Allocator;
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28 import org.dancres.blitz.oid.AllocatorFactory;
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29 import org.dancres.blitz.oid.OID;
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30
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31 import org.dancres.blitz.arc.BackingStore;
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32
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33 import org.dancres.blitz.cache.Identifiable;
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34 import org.dancres.blitz.cache.Identifier;
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35 import org.dancres.blitz.cache.CacheListener;
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36
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37 import org.dancres.blitz.lease.ReapFilter;
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38
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39 import org.dancres.blitz.stats.TypesStat;
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40 import org.dancres.blitz.stats.StatsBoard;
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41
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42 /**
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43 <p>Handles all responsibilities associated with the root Entry type
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44 "java.lang.Object". This is an internal implementation detail. We
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45 maintain a repository of java.lang.Object for the purposes of tracking
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46 subtype information which is used when the JavaSpaces programmer invokes a
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47 <code>take</code> or <code>read</code> on the proxy with a
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48 <code>null</code> template. The <code>null</argument>, of course, means
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49 find an entry of any type.</p>
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50
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51 Storage of concrete instances of Entry are handled by EntryStorage.
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52
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53 @see org.dancres.blitz.entry.EntryStorage
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54 */
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55 class RootStorage implements Storage {
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56 private String theType;
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57
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58 /**
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59 Required because we still store type information
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60 */
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61 private Registry theMetaData;
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62
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63 private ArrayList theSubtypes = new ArrayList();
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64 private String[] theCurrentSubtypes = new String[0];
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65
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66 private boolean noSchemaDefined = false;
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67
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68 private TypesStat theTypesStat;
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69
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70 private EntryConstraints theConstraints = EntryConstraints.MINIMUM;
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71
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72 RootStorage() {
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73 theType = EntryRepository.ROOT_TYPE;
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74 CacheIndexer.newIndexer(theType, theConstraints);
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75 }
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76
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77 public int getNumEntries() throws IOException {
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78 return 0;
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79 }
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80
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81 public EntryConstraints getConstraints() {
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82 return theConstraints;
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83 }
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84
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85 void add(CacheListener aListener) {
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86 }
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87
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88 public String getType() {
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89 return theType;
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90 }
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91
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92 public String getName() {
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93 return theType;
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94 }
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95
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96 public TupleLocator findCached(MangledEntry anEntry) {
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97 return null;
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98 }
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99
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100 /**
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101 @return <code>true</code> if initialization succeeded in accordance
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102 with the mustExist flag. i.e. If mustExist is true and the databases
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103 couldn't be opened one will receive <code>false</code> NOT an
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104 exception.
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105 */
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106 public boolean init(boolean mustExist) throws IOException {
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107 if (mustExist) {
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108 if (! RegistryFactory.exists(theType))
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109 return false;
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110 }
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111
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112 try {
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113 theMetaData = RegistryFactory.get(theType, null);
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114
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115 DiskTxn myTxn = DiskTxn.newStandalone();
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116
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117 try {
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118 byte[] mySubtypeInfo =
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119 theMetaData.getAccessor(myTxn).loadRaw(FixedOIDs.SUBTYPES_KEY);
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120
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121 if (mySubtypeInfo != null) {
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122 theSubtypes =(ArrayList)
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123 ObjectTransformer.toObject(mySubtypeInfo);
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124 updateCurrentTypes();
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125 }
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126 } finally {
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127 myTxn.commit();
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128 }
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129
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130 } catch (FileNotFoundException aFNFE) {
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131 EntryStorage.theLogger.log(Level.SEVERE,
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132 "Couldn't open type db", aFNFE);
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133 throw new IOException("Couldn't open type db");
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134 }
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135
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136 return true;
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137 }
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138
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139 /**
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140 Tells this Repository about a subtype which has just been created
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141 and would need to be search if this type were the specified template.
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142 */
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143 public synchronized void addSubtype(String aType) throws IOException {
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144 if (! theSubtypes.contains(aType)) {
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145 theSubtypes.add(aType);
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146 updateCurrentTypes();
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147 theMetaData.getAccessor().save(FixedOIDs.SUBTYPES_KEY,
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148 theSubtypes);
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149 }
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150 }
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151
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152 public synchronized String[] getSubtypes() {
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153 return theCurrentSubtypes;
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154 }
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155
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156 /**
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157 Called to setup schema information, create indexes etc - should only
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158 be called once in response to <code>true</code> being returned from
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159 <code>didntExist()</code>
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160 */
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161 public synchronized void setFields(MangledField[] aSetOfFields)
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162 throws IOException {
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163 throw new RuntimeException("Shouldn't ever be called - noSchemaDefined is always false!");
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164 }
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165
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166 /**
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167 Indicates if we were created for the first time as the result of
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168 a call to <code>EntryRepositoryFactory.get()</code>. Note that this
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169 flag is reset after <code>setFields()</code> is called. Thus, even
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170 if an EntryRepository has been informed of children, it will still
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171 return <code>true</code> until <code>setFields</code> is called.
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172 */
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173 public boolean noSchemaDefined() {
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174 return noSchemaDefined;
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175 }
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176
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177 public void close() throws IOException {
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178 theMetaData.close();
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179 }
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180
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181 public OID getNextId() throws IOException {
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182 throw new IOException("Shouldn't be called");
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183 }
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184
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185 public void delete() throws IOException {
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186 RegistryFactory.delete(theType);
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187 }
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188
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189 public void bringOutTheDead(EntryReaper aReaper) throws IOException {
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190 return;
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191 }
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192
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193 private synchronized void updateCurrentTypes() {
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194 if (theTypesStat == null) {
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195 theTypesStat = new TypesStat();
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196 StatsBoard.get().add(theTypesStat);
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197 }
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198
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199 String[] myTypes = new String[theSubtypes.size()];
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200 theCurrentSubtypes = (String[]) theSubtypes.toArray(myTypes);
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201
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202 theTypesStat.setTypes(theCurrentSubtypes);
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203 }
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204
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205 private KeyIndex newIndex(String aName, int anOffset) throws IOException {
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206 throw new IOException("Shouldn't be called");
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207 }
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208
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209 private void loadIndexes(byte[] aSetOfIndexes)
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210 throws IOException {
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211 }
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212
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213 /* *******************************************************************
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214 * BackingStore impl
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215 * *******************************************************************/
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216
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217 public void save(Identifiable anIdentifiable) throws IOException {
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218 throw new IOException("Shouldn't be called");
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219 }
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220
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221 public Identifiable load(Identifier anId) throws IOException {
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222 throw new IOException("Shouldn't be called");
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223 }
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224
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225 /* *********************************************************************
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226 Search code starts here
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227 *********************************************************************/
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228
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229 /**
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230 Return a set of potential matches based on the passed template. Note
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231 one must test each returned tuple for an exact match across ALL keys
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232 because this method is "speculative". It will return likely matches
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233 it does not guarentee to have located an exact subset based on the
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234 passed template. As a full match is necessary to avoid hash-collisions
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235 this shouldn't be a problem.
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236
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237 @param anEntry a template to use to locate matches.
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238
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239 @return TupleLocator instance of <code>null</code> if there are no
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240 possible matches.
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241 */
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242 public TupleLocator find(MangledEntry anEntry) throws IOException {
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243 return null;
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244 }
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245 }