Mercurial > hg > blitz_stable

annotate src/EDU/oswego/cs/dl/util/concurrent/ObservableSync.java @ 32:243c74d599bf

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author Dan Creswell <dan.creswell@gmail.com>
date Sat, 12 Jun 2010 10:41:47 +0100
parents 3dc0c5604566
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1 /*
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2 File: ObservableSync.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 History:
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10 Date Who What
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11 1Aug1998 dl Create public version
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12 */
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13
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14 package EDU.oswego.cs.dl.util.concurrent;
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15 import java.util.*;
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16
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17 /**
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18 * The ObservableSync class performs no synchronization
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19 * itself, but invokes event-style messages to other
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20 * observer objects upon invocation of Sync methods.
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21 * These observers typically perform monitoring, logging,
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22 * or other bookkeeping operations surrounding the object
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23 * being managed by this Sync object.
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24 * <p>
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25 * Because ObservableSync does not itself perform any synchronization
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26 * control, the attempt operation always succeeds.
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27 * This class is typically used (via LayeredSync) as a wrapper
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28 * around those that do perform synchronization control.
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29 * <p>
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30 * This class is based around a standard Observer design pattern.
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31 * It is not hard to convert this to instead use a Listener
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32 * design (as seen in AWT and JavaBeans), by defining associated
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33 * EventObjects and forwarding them.
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34 * <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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35 * @see LayeredSync
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36 **/
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37
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38
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39 public class ObservableSync implements Sync {
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40
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41
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42 /**
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43 * Interface for objects that observe ObservableSyncs.
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44 **/
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45 public interface SyncObserver {
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46 /**
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47 * Method called upon acquire or successful attempt of Sync
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48 **/
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49
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50 public void onAcquire(Object arg);
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51
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52 /**
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53 * Method called upon release of Sync.
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54 **/
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55 public void onRelease(Object arg);
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56 }
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57
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58 protected final CopyOnWriteArraySet observers_ = new CopyOnWriteArraySet();
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59 protected Object arg_;
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60
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61 /**
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62 * Create an ObservableSync that uses the supplied argument
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63 * for all notifications. The argument is typically an
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64 * object that is being managed by this Sync object.
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65 **/
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66
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67 public ObservableSync(Object notificationArgument) {
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68 arg_ = notificationArgument;
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69 }
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70
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71 /**
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72 * Return the argument used for notifications
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73 **/
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74 public synchronized Object getNotificationArgument() {
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75 return arg_;
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76 }
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77
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78 /**
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79 * Set the argument used for notifications.
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80 * @return the previous value of this argument
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81 **/
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82
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83 public synchronized Object setNotificationArgument(Object notificationArg) {
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84 Object old = arg_;
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85 arg_ = notificationArg;
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86 return old;
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87 }
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88
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89
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90
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91 public void acquire() {
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92 Object arg = getNotificationArgument();
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93 for (Iterator it = observers_.iterator(); it.hasNext(); ) {
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94 ((SyncObserver)it.next()).onAcquire(arg);
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95 }
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96 }
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97
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98 public boolean attempt(long msecs) {
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99 acquire();
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100 return true;
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101 }
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102
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103 public void release() {
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104 Object arg = getNotificationArgument();
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105 for (Iterator it = observers_.iterator(); it.hasNext(); ) {
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106 ((SyncObserver)it.next()).onRelease(arg);
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107 }
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108 }
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110
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111
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112 /** Add obs to the set of observers **/
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113 public void attach(SyncObserver obs) {
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114 observers_.add(obs);
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115 }
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116
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117 /** Remove obs from the set of observers. No effect if not in set **/
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118 public void detach(SyncObserver obs) {
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119 observers_.remove(obs);
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120 }
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121
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122 /** Return an iterator that can be used to traverse through
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123 * current set of observers
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124 **/
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125
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126 public Iterator observers() {
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127 return observers_.iterator();
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128 }
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131 }
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