Mercurial > hg > blitz_stable

annotate src/org/dancres/blitz/meta/RegistryImpl.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:
rev   line source
0
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1 package org.dancres.blitz.meta;
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2
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3 import java.io.Serializable;
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4 import java.io.IOException;
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5 import java.io.FileNotFoundException;
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6 import java.io.File;
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7
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8 import java.util.logging.*;
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9
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10 import com.sleepycat.je.DatabaseException;
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11 import com.sleepycat.je.Database;
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12 import com.sleepycat.je.DatabaseEntry;
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13 import com.sleepycat.je.OperationStatus;
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14 import com.sleepycat.je.DatabaseConfig;
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15
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16 import org.dancres.blitz.disk.Disk;
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17 import org.dancres.blitz.disk.DiskTxn;
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18 import org.dancres.blitz.disk.Syncable;
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19
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20 import org.dancres.blitz.Logging;
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21
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22 import org.dancres.util.ObjectTransformer;
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23
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24 class RegistryImpl implements Registry {
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25 private Database theDb;
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26 private String theName;
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27
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28 static Logger theLogger =
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29 Logging.newLogger("org.dancres.blitz.meta.Registry");
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30
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31 RegistryImpl(String aName, Initializer anInitializer) throws IOException {
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32 theName = aName;
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33
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34 try {
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35 // theDb.set_flags(Db.DB_REVSPLITOFF);
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36
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37 DiskTxn myTxn = DiskTxn.newStandalone();
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38
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39 DatabaseConfig myConfig = new DatabaseConfig();
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40
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41 try {
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42 if (exists(aName)) {
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43 theDb = Disk.newDb(myTxn.getDbTxn(), getDbNameFor(aName),
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44 myConfig);
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45 } else {
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46 myConfig.setAllowCreate(true);
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47 theDb = Disk.newDb(myTxn.getDbTxn(), getDbNameFor(aName),
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48 myConfig);
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49
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50 if (anInitializer != null)
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51 anInitializer.execute(getAccessor(myTxn));
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52 }
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53 } finally {
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54 myTxn.commit(true);
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55 }
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56
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57 } catch (FileNotFoundException aFNFE) {
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58 theLogger.log(Level.SEVERE, "File not found", aFNFE);
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59 try {
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60 theDb.close();
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61 } catch (DatabaseException aDbe) {
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62 // Don't care anymore
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63 }
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64
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65 throw new IOException("File not found");
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66 } catch (DatabaseException aDBE) {
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67 theLogger.log(Level.SEVERE, "DatabaseException", aDBE);
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68 try {
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69 theDb.close();
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70 } catch (DatabaseException aDbe) {
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71 // Don't care anymore
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72 }
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73 throw new IOException("DatabaseException");
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74 }
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75 }
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76
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77 public RegistryAccessor getAccessor() throws IOException {
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78 return new RegistryAccessorImpl(this);
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79 }
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80
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81 public RegistryAccessor getAccessor(DiskTxn aTxn) throws IOException {
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82 return new RegistryAccessorImpl(this, aTxn);
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83 }
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84
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85 Serializable load(DiskTxn aTxn, byte[] aKey) throws IOException {
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86 DatabaseEntry myKey = new DatabaseEntry(aKey);
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87 DatabaseEntry myData = new DatabaseEntry();
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88
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89 try {
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90 OperationStatus myResult =
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91 theDb.get(aTxn.getDbTxn(), myKey, myData, null);
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92
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93 if (myResult.equals(OperationStatus.NOTFOUND))
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94 return null;
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95 else {
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96 try {
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97 return ObjectTransformer.toObject(myData.getData());
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98 } catch (Exception anE) {
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99 theLogger.log(Level.SEVERE, "Failed to unpack metadata",
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100 anE);
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101 throw new IOException("Failed to unpack metadata");
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102 }
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103 }
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104 } catch (Exception anE) {
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105 theLogger.log(Level.SEVERE, "Failed to load metadata",
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106 anE);
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107 throw new IOException("Failed to load metadata");
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108 }
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109 }
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110
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111 byte[] loadRaw(DiskTxn aTxn, byte[] aKey) throws IOException {
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112 DatabaseEntry myKey = new DatabaseEntry(aKey);
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113 DatabaseEntry myData = new DatabaseEntry();
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114
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115 try {
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116 OperationStatus myResult =
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117 theDb.get(aTxn.getDbTxn(), myKey, myData, null);
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118
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119 if (myResult.equals(OperationStatus.NOTFOUND))
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120 return null;
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121 else
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122 return myData.getData();
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123 } catch (DatabaseException aDbe) {
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124 theLogger.log(Level.SEVERE, "Got DatabaseException", aDbe);
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125 throw new IOException("Got Dbe");
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126 }
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127 }
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128
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129 void save(DiskTxn aTxn, byte[] aKey, Serializable anObject)
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130 throws IOException {
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131
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132 DatabaseEntry myKey = new DatabaseEntry(aKey);
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133
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134 byte[] myFlatObject = null;
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135
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136 try {
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137 myFlatObject = ObjectTransformer.toByte(anObject);
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138 } catch (Exception anE) {
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139 theLogger.log(Level.SEVERE, "Failed to pack metadata",
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140 anE);
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141 throw new IOException("Failed to pack metadata");
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142 }
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143
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144 DatabaseEntry myData = new DatabaseEntry(myFlatObject);
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145
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146 try {
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147 theDb.put(aTxn.getDbTxn(), myKey, myData);
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148 } catch (DatabaseException aDbe) {
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149 theLogger.log(Level.SEVERE, "Got DatabaseException", aDbe);
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150 throw new IOException("Got Dbe");
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151 }
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152 }
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153
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154 MetaIterator readAll(DiskTxn aTxn) throws IOException {
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155 return new MetaIteratorImpl(theDb, aTxn);
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156 }
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157
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158 void delete(DiskTxn aTxn, byte[] aKey) throws IOException {
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159
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160 try {
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161 theDb.delete(aTxn.getDbTxn(), new DatabaseEntry(aKey));
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162 } catch (DatabaseException aDbe) {
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163 theLogger.log(Level.SEVERE, "Got DatabaseException", aDbe);
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164 throw new IOException("Got Dbe");
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165 }
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166 }
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167
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168 public void close() throws IOException {
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169 try {
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170 theDb.close();
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171 } catch (DatabaseException aDbe) {
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172 theLogger.log(Level.SEVERE, "Got DatabaseException", aDbe);
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173 throw new IOException("Got Dbe");
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174 }
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175 }
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176
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177 void delete() throws IOException {
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178 Disk.deleteDb(getDbNameFor(theName));
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179 }
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180
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181 static boolean exists(String aName) {
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182 return Disk.dbExists(getDbNameFor(aName));
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183 }
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184
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185 private static String getDbNameFor(String aRegName) {
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186 return aRegName + "-meta";
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187 }
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188 }