Mercurial > hg > blitz_condensed

annotate src/org/dancres/blitz/remote/view/EntryViewFactory.java @ 3:d3ec5ebc3dba

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Fix up a small race-condition and and a todo for thread-safety in MatchSetImpl.
author Dan Creswell <dan.creswell@gmail.com>
date Sat, 25 Apr 2009 08:38:27 +0100
parents 3dc0c5604566
children
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0
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1 package org.dancres.blitz.remote.view;
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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.HashMap;
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6
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7 import java.util.logging.Logger;
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8 import java.util.logging.Level;
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9
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10 import net.jini.id.Uuid;
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11 import net.jini.id.UuidFactory;
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12
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13 import net.jini.config.ConfigurationException;
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14
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15 import net.jini.core.transaction.Transaction;
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16 import net.jini.core.transaction.TransactionException;
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17
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18 import org.dancres.blitz.EntryView;
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19 import org.dancres.blitz.SpaceImpl;
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20
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21 import org.dancres.blitz.mangler.MangledEntry;
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22
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23 import org.dancres.blitz.lease.LeaseReaper;
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24 import org.dancres.blitz.lease.Reapable;
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25 import org.dancres.blitz.lease.ReapFilter;
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26
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27 import org.dancres.blitz.util.Time;
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28
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29 import org.dancres.blitz.Logging;
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30
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31 import org.dancres.blitz.config.ConfigurationFactory;
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32
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33 /**
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34 Manages and tracks current <code>EntryView</code> instances instantiated
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35 from a <code>SpaceImpl</code> instance. In particular it assigns those
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36 instances a unique id and handles leasing aspects.
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37 */
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38 public class EntryViewFactory implements Reapable {
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39 private static Logger theLogger =
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40 Logging.newLogger("org.dancres.blitz.remote.view.EntryViewFactory");
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41
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42 private static EntryViewFactory theFactory = new EntryViewFactory();
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43
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44 public static EntryViewFactory get() {
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45 return theFactory;
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46 }
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47
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48 private HashMap theActiveViews = new HashMap();
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49
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50 private LeaseReaper theReaper;
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51
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52 private boolean shouldUpdate;
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53
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54 private EntryViewFactory() {
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55 try {
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56 long myReapInterval =
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57 ((Long) ConfigurationFactory.getEntry("viewReapInterval",
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58 long.class,
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59 new Long(30 * 60 * 1000))).longValue();
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60 theReaper = new LeaseReaper("View", null, myReapInterval);
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61
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62 theReaper.add(this);
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63
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64 shouldUpdate = ((Boolean)
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65 ConfigurationFactory.getEntry("updateContents",
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66 boolean.class,
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67 new Boolean(true))).booleanValue();
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68
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69 } catch (ConfigurationException aCE) {
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70 theLogger.log(Level.SEVERE, "Failed to load config", aCE);
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71 }
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72 }
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73
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74 public ViewRegistration newView(MangledEntry[] aTemplates, Transaction aTxn,
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75 boolean holdLocks, long aLeaseDuration,
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76 long aLimit, SpaceImpl aSpace)
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77 throws IOException, TransactionException {
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78
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79 // Hold locks should only stick for a non-null transaction, other
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80 // wise we're just testing....
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81
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82 EntryView myView = aSpace.getView(aTemplates, aTxn, holdLocks,
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83 shouldUpdate, aLimit);
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84
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85 EntryViewUID myUid = new EntryViewUID(UuidFactory.generate());
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86
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87 long myExpiry = Time.getAbsoluteTime(aLeaseDuration);
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88
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89 synchronized(this) {
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90 theActiveViews.put(myUid, new ViewHolder(myView, myExpiry));
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91 }
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92
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93 return new ViewRegistration(myUid, myExpiry);
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94 }
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95
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96 public EntryView getView(EntryViewUID aUID) {
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97
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98 synchronized(this) {
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99 ViewHolder myHolder = (ViewHolder) theActiveViews.get(aUID);
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100
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101 if ((myHolder == null) ||
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102 (myHolder.hasExpired(System.currentTimeMillis()))) {
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103
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104 return null;
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105 } else {
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106 return myHolder.getView();
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107 }
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108 }
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109 }
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110
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111 public EntryView delete(EntryViewUID aUID) {
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112
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113 synchronized(this) {
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114 ViewHolder myHolder = (ViewHolder) theActiveViews.remove(aUID);
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115
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116 if (myHolder != null) {
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117 myHolder.getView().close();
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118 return myHolder.getView();
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119 }
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120
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121 return null;
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122 }
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123 }
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124
3
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125 /**
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126 @todo Fix up the missing synchronization inside the loop (should be around the get and expire test)
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127 */
0
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128 public void reap(ReapFilter aFilter) {
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129 /*
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130 No reap filters will be configured so we can ignore those - see
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131 initialization in constructor
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132 */
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133 long myTime = System.currentTimeMillis();
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134
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135 Object[] myKeys;
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136
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137 synchronized(this) {
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138 myKeys = theActiveViews.keySet().toArray();
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139 }
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140
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141 for (int i = 0; i < myKeys.length; i++) {
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142 ViewHolder myHolder =
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143 (ViewHolder) theActiveViews.get(myKeys[i]);
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144
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145 if (myHolder.hasExpired(myTime)) {
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146 delete((EntryViewUID) myKeys[i]);
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Dan Creswell <dan.creswell@gmail.com>
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147 }
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148 }
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149 }
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150
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Dan Creswell <dan.creswell@gmail.com>
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151 /* ***********************************************************************
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152 * Lease renewal/cancel
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153 * ***********************************************************************/
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154
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155 boolean renew(EntryViewUID aUID, long anExpiry) {
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156 synchronized(this) {
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157 ViewHolder myHolder = (ViewHolder) theActiveViews.get(aUID);
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158
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159 if (myHolder != null) {
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160 return myHolder.testAndSetExpiry(System.currentTimeMillis(),
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161 anExpiry);
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162 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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163
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164 return false;
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165 }
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166 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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167
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168 boolean cancel(EntryViewUID aUID) {
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169 return (delete(aUID) != null);
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170 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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171
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172 class ViewHolder {
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173 private long theExpiry;
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174 private EntryView theView;
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175
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176 ViewHolder(EntryView aView, long anExpiry) {
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177 theView = aView;
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178 theExpiry = anExpiry;
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179 }
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180
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181 boolean hasExpired(long aTime) {
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182 return (theExpiry < aTime);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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183 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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184
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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185 boolean testAndSetExpiry(long aTime, long anExpiry) {
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186 if (theExpiry < aTime)
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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187 return false;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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188
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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189 theExpiry = anExpiry;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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190
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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191 return true;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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192 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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193
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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194 EntryView getView() {
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195 return theView;
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196 }
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Dan Creswell <dan.creswell@gmail.com>
parents:
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197 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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198 }