Mercurial > hg > blitz_condensed
annotate src/EDU/oswego/cs/dl/util/concurrent/VetoableChangeMulticaster.java @ 0:3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
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1 /* |
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2 File: ProperyChangeMulticaster.java |
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3 |
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4 Originally written by Doug Lea and released into the public domain. |
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5 This may be used for any purposes whatsoever without acknowledgment. |
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6 Thanks for the assistance and support of Sun Microsystems Labs, |
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7 and everyone contributing, testing, and using this code. |
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8 |
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9 This class is based on Sun JDK java.beans.VetoableChangeSupport, |
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10 which is copyrighted by Sun. (It shares practically no code, but for |
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11 consistency, the documentation was lifted and adapted here.) |
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12 |
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13 History: |
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14 Date Who What |
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15 14Mar1999 dl first release |
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16 */ |
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17 |
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18 package EDU.oswego.cs.dl.util.concurrent; |
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19 |
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20 import java.beans.VetoableChangeListener; |
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21 import java.beans.PropertyChangeEvent; |
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22 import java.beans.PropertyVetoException; |
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23 import java.util.HashMap; |
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24 import java.io.Serializable; |
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25 import java.io.ObjectOutputStream; |
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26 import java.io.ObjectInputStream; |
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27 import java.io.IOException; |
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28 |
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29 /** |
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30 * This class is interoperable with java.beans.VetoableChangeSupport, |
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31 * but relies on a streamlined copy-on-write scheme similar to |
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32 * that used in CopyOnWriteArrayList. It also adheres to clarified |
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33 * semantics of add, remove, and fireVetoableChange operations. |
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34 * <p> |
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35 * <b>Sample usage.</b> |
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36 * |
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37 * <pre> |
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38 * class Thing { |
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39 * protected Color myColor = Color.red; // an example property |
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40 * protected boolean changePending; // track whether in midst of change |
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41 * |
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42 * // vetoable listeners: |
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43 * protected VetoableChangeMulticaster vetoers = |
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44 * new VetoableChangeMulticaster(this); |
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45 * |
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46 * // Possibly also some ordinary listeners: |
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47 * protected PropertyChangeMulticaster listeners = |
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48 * new PropertyChangeMulticaster(this); |
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49 * |
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50 * // registration methods, including: |
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51 * void addVetoer(VetoableChangeListener l) { |
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52 * // Use the `ifAbsent' version to avoid duplicate notifications |
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53 * vetoers.addVetoableChangeListenerIfAbsent(l); |
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54 * } |
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55 * |
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56 * public synchronized Color getColor() { // accessor |
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57 * return myColor; |
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58 * } |
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59 * |
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60 * // Simple transactional control for vetos |
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61 * |
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62 * public void setColor(int newColor) throws PropertyVetoException { |
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63 * Color oldColor = prepareSetColor(newColor); |
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64 * |
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65 * try { |
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66 * vetoers.fireVetoableChange("color", oldColor, newColor); |
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67 * commitColor(newColor); |
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68 * listeners.firePropertyChange("color", oldColor, newColor); |
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69 * } |
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70 * catch(PropertyVetoException ex) { |
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71 * abortSetColor(); |
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72 * throw ex; |
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73 * } |
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74 * } |
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75 * |
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76 * // Called on entry to proposed vetoable change from setColor. |
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77 * // Throws exception if there is already another change in progress. |
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78 * // Returns current color |
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79 * synchronized int prepareSetColor(Color c) throws PropertyVetoException { |
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80 * // only support one transaction at a time |
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81 * if (changePending) |
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82 * throw new PropertyVetoException("Concurrent modification"); |
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83 * // (Could alternatively wait out other transactions via |
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84 * // a wait/notify construction based on changePending.) |
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85 * |
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86 * // perhaps some other screenings, like: |
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87 * else if (c == null) |
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88 * throw new PropertyVetoException("Cannot change color to Null"); |
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89 * else { |
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90 * changePending = true; |
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91 * return myColor; |
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92 * } |
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93 * } |
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94 * |
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95 * synchronized void commitColor(Color newColor) { |
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96 * myColor = newColor; |
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97 * changePending = false; |
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98 * } |
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99 * |
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100 * synchronized void abortSetColor() { |
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101 * changePending = false; |
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102 * } |
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103 * |
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104 * } |
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105 * </pre> |
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106 * <p>[<a href="http://gee.cs.oswego.edu/dl/classes/EDU/oswego/cs/dl/util/concurrent/intro.html"> Introduction to this package. </a>] |
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107 **/ |
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108 |
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109 public class VetoableChangeMulticaster implements Serializable { |
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110 |
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111 // This code is 90% identical with PropertyChangeMulticaster, |
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112 // but there is no good way to unify the code while maintaining |
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113 // interoperability with beans versions. |
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114 |
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115 /** |
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116 * The array of listeners. Copied on each update |
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117 **/ |
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118 |
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119 protected transient VetoableChangeListener[] listeners = new VetoableChangeListener[0]; |
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120 |
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121 |
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122 /** |
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123 * The object to be provided as the "source" for any generated events. |
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124 * @serial |
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125 */ |
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126 protected final Object source; |
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127 |
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128 /** |
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129 * HashMap for managing listeners for specific properties. |
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130 * Maps property names to VetoableChangeMulticaster objects. |
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131 * @serial |
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132 */ |
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133 protected HashMap children; |
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134 |
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135 /** |
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136 * Return the child associated with property, or null if no such |
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137 **/ |
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138 |
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139 protected synchronized VetoableChangeMulticaster getChild(String propertyName) { |
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140 return (children == null)? null : |
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141 ((VetoableChangeMulticaster)children.get(propertyName)); |
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142 } |
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143 |
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144 |
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145 /** |
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146 * Constructs a <code>VetoableChangeMulticaster</code> object. |
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147 * |
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148 * @param sourceBean The bean to be given as the source for any events. |
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149 * @exception NullPointerException if sourceBean is null |
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150 */ |
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151 |
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152 public VetoableChangeMulticaster(Object sourceBean) { |
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153 if (sourceBean == null) { |
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154 throw new NullPointerException(); |
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155 } |
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156 |
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157 source = sourceBean; |
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158 } |
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159 |
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160 /** |
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161 * Add a VetoableChangeListener to the listener list. |
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162 * The listener is registered for all properties. |
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163 * If the listener is added multiple times, it will |
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164 * receive multiple change notifications upon any fireVetoableChange. |
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165 * |
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166 * @param listener The VetoableChangeListener to be added |
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167 */ |
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168 |
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169 public synchronized void addVetoableChangeListener(VetoableChangeListener listener) { |
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170 |
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171 if (listener == null) throw new NullPointerException(); |
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172 |
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173 int len = listeners.length; |
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174 VetoableChangeListener[] newArray = new VetoableChangeListener[len + 1]; |
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175 if (len > 0) |
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176 System.arraycopy(listeners, 0, newArray, 0, len); |
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177 newArray[len] = listener; |
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178 listeners = newArray; |
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179 } |
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180 |
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181 /** |
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182 * Add a PropertyChangeListener to the listener list if it is |
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183 * not already present. |
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184 * The listener is registered for all properties. |
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185 * The operation maintains Set semantics: If the listener is already |
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186 * registered, the operation has no effect. |
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187 * |
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188 * @param listener The PropertyChangeListener to be added |
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189 * @exception NullPointerException If listener is null |
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190 */ |
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191 |
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192 public synchronized void addVetoableChangeListenerIfAbsent(VetoableChangeListener listener) { |
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193 |
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194 if (listener == null) throw new NullPointerException(); |
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195 |
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196 // Copy while checking if already present. |
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197 int len = listeners.length; |
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198 VetoableChangeListener[] newArray = new VetoableChangeListener[len + 1]; |
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199 for (int i = 0; i < len; ++i) { |
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200 newArray[i] = listeners[i]; |
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201 if (listener.equals(listeners[i])) |
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202 return; // already present -- throw away copy |
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203 } |
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204 newArray[len] = listener; |
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205 listeners = newArray; |
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206 } |
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207 |
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208 |
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209 /** |
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210 * Remove an occurrence of a VetoableChangeListener from the listener list. |
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211 * It removes at most one occurrence of the given listener. |
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212 * If the listener was added multiple times it must be removed |
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213 * mulitple times. |
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214 * This removes a VetoableChangeListener that was registered |
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215 * for all properties, and has no effect if registered for only |
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216 * one or more specified properties. |
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217 * |
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218 * @param listener The VetoableChangeListener to be removed |
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219 */ |
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220 |
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221 public synchronized void removeVetoableChangeListener(VetoableChangeListener listener) { |
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222 |
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223 int newlen = listeners.length-1; |
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224 if (newlen < 0 || listener == null) return; |
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225 |
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226 // Copy while searching for element to remove |
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227 |
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228 VetoableChangeListener[] newArray = new VetoableChangeListener[newlen]; |
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229 |
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230 for (int i = 0; i < newlen; ++i) { |
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231 if (listener.equals(listeners[i])) { |
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232 // copy remaining and exit |
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233 for (int k = i + 1; k <= newlen; ++k) newArray[k-1] = listeners[k]; |
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234 listeners = newArray; |
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235 return; |
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236 } |
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237 else |
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238 newArray[i] = listeners[i]; |
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239 } |
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240 |
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241 // special-case last cell |
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242 if (listener.equals(listeners[newlen])) |
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243 listeners = newArray; |
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244 |
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245 } |
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246 |
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247 /** |
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248 * Add a VetoableChangeListener for a specific property. The listener |
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249 * will be invoked only when a call on fireVetoableChange names that |
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250 * specific property. However, if a listener is registered both for all |
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251 * properties and a specific property, it will receive multiple |
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252 * notifications upon changes to that property. |
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253 * |
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254 * @param propertyName The name of the property to listen on. |
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255 * @param listener The VetoableChangeListener to be added |
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256 * @exception NullPointerException If listener is null |
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257 */ |
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258 |
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259 public void addVetoableChangeListener(String propertyName, |
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260 VetoableChangeListener listener) { |
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261 |
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262 if (listener == null) throw new NullPointerException(); |
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263 |
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264 VetoableChangeMulticaster child = null; |
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265 |
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266 synchronized(this) { |
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267 if (children == null) |
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268 children = new HashMap(); |
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269 else |
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270 child = (VetoableChangeMulticaster)children.get(propertyName); |
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271 |
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272 if (child == null) { |
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273 child = new VetoableChangeMulticaster(source); |
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274 children.put(propertyName, child); |
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275 } |
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276 } |
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277 |
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278 child.addVetoableChangeListener(listener); |
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279 } |
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280 |
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281 /** |
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282 * Add a VetoableChangeListener for a specific property, if it is not |
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283 * already registered. The listener |
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284 * will be invoked only when a call on fireVetoableChange names that |
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285 * specific property. |
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286 * |
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287 * @param propertyName The name of the property to listen on. |
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288 * @param listener The VetoableChangeListener to be added |
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289 * @exception NullPointerException If listener is null |
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290 */ |
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291 |
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292 public void addVetoableChangeListenerIfAbsent(String propertyName, |
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293 VetoableChangeListener listener) { |
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294 |
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295 if (listener == null) throw new NullPointerException(); |
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296 |
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297 VetoableChangeMulticaster child = null; |
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298 |
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299 synchronized(this) { |
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300 if (children == null) |
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301 children = new HashMap(); |
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302 else |
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303 child = (VetoableChangeMulticaster)children.get(propertyName); |
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304 |
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305 if (child == null) { |
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306 child = new VetoableChangeMulticaster(source); |
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307 children.put(propertyName, child); |
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308 } |
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309 } |
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310 |
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311 child.addVetoableChangeListenerIfAbsent(listener); |
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312 } |
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313 |
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314 |
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315 /** |
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316 * Remove a VetoableChangeListener for a specific property. |
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317 * Affects only the given property. |
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318 * If the listener is also registered for all properties, |
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319 * then it will continue to be registered for them. |
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320 * |
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321 * @param propertyName The name of the property that was listened on. |
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322 * @param listener The VetoableChangeListener to be removed |
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323 */ |
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324 |
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325 public void removeVetoableChangeListener(String propertyName, |
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326 VetoableChangeListener listener) { |
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327 |
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328 VetoableChangeMulticaster child = getChild(propertyName); |
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329 if (child != null) |
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330 child.removeVetoableChangeListener(listener); |
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331 } |
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332 |
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333 |
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334 /** |
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335 * Helper method to relay evt to all listeners. |
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336 * Called by all public fireVetoableChange methods. |
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337 **/ |
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338 |
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339 protected void multicast(PropertyChangeEvent evt) throws PropertyVetoException { |
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340 |
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341 VetoableChangeListener[] array; // bind in synch block below |
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342 VetoableChangeMulticaster child = null; |
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343 |
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344 synchronized (this) { |
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345 array = listeners; |
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346 |
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347 if (children != null && evt.getPropertyName() != null) |
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348 child = (VetoableChangeMulticaster)children.get(evt.getPropertyName()); |
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349 } |
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350 |
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351 // Loop through array, and then cascade to child. |
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352 |
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353 int i = 0; // make visible to catch clause |
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354 |
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355 try { |
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356 for (i = 0; i < array.length; ++i) |
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357 array[i].vetoableChange(evt); |
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358 |
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359 if (child != null) |
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360 child.multicast(evt); |
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361 } |
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362 |
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363 catch (PropertyVetoException veto) { |
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364 |
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365 // Revert all that have been notified |
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366 |
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367 PropertyChangeEvent revert = |
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368 new PropertyChangeEvent(evt.getSource(), |
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369 evt.getPropertyName(), |
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370 evt.getNewValue(), |
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371 evt.getOldValue()); |
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372 |
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373 int lastNotified = (i < array.length)? i : (array.length-1); |
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374 |
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375 for (int k = 0; k <= lastNotified; ++k) { |
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376 try { |
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377 array[k].vetoableChange(revert); |
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378 } |
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379 catch (PropertyVetoException ignore) { |
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380 // Cannot veto a reversion |
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381 } |
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382 } |
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383 |
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384 // Rethrow the PropertyVetoException. |
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385 throw veto; |
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386 } |
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387 } |
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388 |
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389 |
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390 /** |
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391 * Report a vetoable property update to any registered listeners. |
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392 * Notifications are sent serially (although in no particular order) |
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393 * to the list of listeners, |
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394 * aborting if one throws PropertyVetoException. Upon this exception, |
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395 * fire a new event reverting this |
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396 * change to all listeners that have already been notified |
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397 * (ignoring any further vetos), |
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398 * suppress notifications to all other listeners, and |
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399 * then rethrow the PropertyVetoException. |
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400 * <p> |
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401 * No event is fired if old and new are equal non-null. |
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402 * |
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403 * @param propertyName The programmatic name of the property |
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404 * that was changed. |
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405 * @param oldValue The old value of the property. |
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406 * @param newValue The new value of the property. |
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407 * @exception PropertyVetoException if a recipient wishes the property |
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408 * change to be rolled back. |
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409 */ |
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410 public void fireVetoableChange(String propertyName, |
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411 Object oldValue, Object newValue) throws PropertyVetoException { |
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412 |
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413 if (oldValue == null || newValue == null || !oldValue.equals(newValue)) { |
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414 multicast(new PropertyChangeEvent(source, |
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415 propertyName, |
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416 oldValue, |
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417 newValue)); |
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418 } |
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419 |
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420 } |
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421 |
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422 /** |
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423 * Report a vetoable property update to any registered listeners. |
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424 * Notifications are sent serially (although in no particular order) |
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425 * to the list of listeners, |
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426 * aborting if one throws PropertyVetoException. Upon this exception, |
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427 * fire a new event reverting this |
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428 * change to all listeners that have already been notified |
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429 * (ignoring any further vetos), |
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430 * suppress notifications to all other listeners, and |
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431 * then rethrow the PropertyVetoException. |
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432 * <p> |
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433 * No event is fired if old and new are equal. |
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434 * <p> |
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435 * This is merely a convenience wrapper around the more general |
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436 * fireVetoableChange method that takes Object values. |
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437 * |
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438 * @param propertyName The programmatic name of the property |
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439 * that was changed. |
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440 * @param oldValue The old value of the property. |
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441 * @param newValue The new value of the property. |
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442 * @exception PropertyVetoException if the recipient wishes the property |
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443 * change to be rolled back. |
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444 */ |
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445 public void fireVetoableChange(String propertyName, |
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446 int oldValue, int newValue) throws PropertyVetoException { |
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447 if (oldValue != newValue) { |
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448 multicast(new PropertyChangeEvent(source, |
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449 propertyName, |
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450 new Integer(oldValue), |
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451 new Integer(newValue))); |
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452 } |
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453 } |
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454 |
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455 |
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456 /** |
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457 * Report a vetoable property update to any registered listeners. |
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458 * Notifications are sent serially (although in no particular order) |
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459 * to the list of listeners, |
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460 * aborting if one throws PropertyVetoException. Upon this exception, |
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461 * fire a new event reverting this |
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462 * change to all listeners that have already been notified |
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463 * (ignoring any further vetos), |
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464 * suppress notifications to all other listeners, and |
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465 * then rethrow the PropertyVetoException. |
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466 * <p> |
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467 * No event is fired if old and new are equal. |
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468 * <p> |
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469 * This is merely a convenience wrapper around the more general |
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470 * fireVetoableChange method that takes Object values. |
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471 * |
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472 * @param propertyName The programmatic name of the property |
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473 * that was changed. |
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474 * @param oldValue The old value of the property. |
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475 * @param newValue The new value of the property. |
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476 * @exception PropertyVetoException if the recipient wishes the property |
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477 * change to be rolled back. |
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478 */ |
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479 public void fireVetoableChange(String propertyName, |
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480 boolean oldValue, boolean newValue) throws PropertyVetoException { |
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481 if (oldValue != newValue) { |
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482 multicast(new PropertyChangeEvent(source, |
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483 propertyName, |
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484 new Boolean(oldValue), |
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485 new Boolean(newValue))); |
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486 } |
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487 } |
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488 |
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489 /** |
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490 * Report a vetoable property update to any registered listeners. |
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491 * Notifications are sent serially (although in no particular order) |
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492 * to the list of listeners, |
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493 * aborting if one throws PropertyVetoException. Upon this exception, |
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494 * fire a new event reverting this |
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495 * change to all listeners that have already been notified |
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496 * (ignoring any further vetos), |
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497 * suppress notifications to all other listeners, and |
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498 * then rethrow the PropertyVetoException. |
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499 * <p> |
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500 * No event is fired if old and new are equal and non-null. |
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501 * |
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502 * equal and non-null. |
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503 * @param evt The PropertyChangeEvent object. |
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504 * @exception PropertyVetoException if the recipient wishes the property |
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505 * change to be rolled back. |
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506 */ |
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507 public void fireVetoableChange(PropertyChangeEvent evt) throws PropertyVetoException { |
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508 Object oldValue = evt.getOldValue(); |
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509 Object newValue = evt.getNewValue(); |
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510 if (oldValue == null || newValue == null || !oldValue.equals(newValue)) |
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511 multicast(evt); |
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512 } |
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513 |
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514 /** |
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515 * Check if there are any listeners for a specific property. |
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516 * If propertyName is null, return whether there are any listeners at all. |
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517 * |
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518 * @param propertyName the property name. |
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519 * @return true if there are one or more listeners for the given property |
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520 * |
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521 */ |
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522 public boolean hasListeners(String propertyName) { |
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523 |
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524 VetoableChangeMulticaster child; |
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525 |
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526 synchronized (this) { |
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527 if (listeners.length > 0) |
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528 return true; |
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529 else if (propertyName == null || children == null) |
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530 return false; |
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531 else { |
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532 child = (VetoableChangeMulticaster)children.get(propertyName); |
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533 if (child == null) |
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534 return false; |
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535 } |
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536 } |
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537 |
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538 return child.hasListeners(null); |
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539 } |
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540 |
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541 |
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542 /** |
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543 * @serialData Null terminated list of <code>VetoableChangeListeners</code>. |
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544 * <p> |
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545 * At serialization time we skip non-serializable listeners and |
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546 * only serialize the serializable listeners. |
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547 * |
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548 */ |
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549 private synchronized void writeObject(ObjectOutputStream s) throws IOException { |
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550 s.defaultWriteObject(); |
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551 |
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552 for (int i = 0; i < listeners.length; i++) { |
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553 VetoableChangeListener l = listeners[i]; |
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554 if (listeners[i] instanceof Serializable) { |
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555 s.writeObject(listeners[i]); |
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556 } |
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557 } |
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558 s.writeObject(null); |
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559 } |
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560 |
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561 |
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562 private void readObject(ObjectInputStream s) throws ClassNotFoundException, IOException { |
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563 listeners = new VetoableChangeListener[0]; // paranoically reset |
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564 s.defaultReadObject(); |
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565 |
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566 Object listenerOrNull; |
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567 while (null != (listenerOrNull = s.readObject())) { |
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568 addVetoableChangeListener((VetoableChangeListener)listenerOrNull); |
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569 } |
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570 } |
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571 |
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572 } |