Mercurial > hg > blitz_stable

annotate src/EDU/oswego/cs/dl/util/concurrent/SyncSortedMap.java @ 27:511648fa4d64 Version 2.1

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Version to 2.1
author Dan Creswell <dan.creswell@gmail.com>
date Mon, 04 Jan 2010 13:00:40 +0000
parents 3dc0c5604566
children
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1 /*
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2 File: SyncSortedMap.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 * SyncSortedMaps wrap Sync-based control around java.util.SortedMaps.
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19 * They support the following additional reader operations over
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20 * SyncMap: comparator, subMap, headMap, tailMap, firstKey, lastKey.
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21 * <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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22 * @see SyncCollection
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23 **/
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24
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25
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26 public class SyncSortedMap extends SyncMap implements SortedMap {
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27
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28 /**
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29 * Create a new SyncSortedMap protecting the given map,
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30 * and using the given sync to control both reader and writer methods.
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31 * Common, reasonable choices for the sync argument include
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32 * Mutex, ReentrantLock, and Semaphores initialized to 1.
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33 **/
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34 public SyncSortedMap(SortedMap map, Sync sync) {
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35 this (map, sync, sync);
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36 }
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37
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38 /**
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39 * Create a new SyncSortedMap protecting the given map,
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40 * and using the given ReadWriteLock to control reader and writer methods.
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41 **/
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42 public SyncSortedMap(SortedMap map, ReadWriteLock rwl) {
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43 super (map, rwl.readLock(), rwl.writeLock());
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44 }
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45
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46 /**
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47 * Create a new SyncSortedMap protecting the given map,
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48 * and using the given pair of locks to control reader and writer methods.
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49 **/
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50 public SyncSortedMap(SortedMap map, Sync readLock, Sync writeLock) {
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51 super(map, readLock, writeLock);
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52 }
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53
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54
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55 protected SortedMap baseSortedMap() {
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56 return (SortedMap)c_;
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57 }
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58
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59 public Comparator comparator() {
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60 boolean wasInterrupted = beforeRead();
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61 try {
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62 return baseSortedMap().comparator();
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63 }
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64 finally {
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65 afterRead(wasInterrupted);
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66 }
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67 }
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68
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69 public Object firstKey() {
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70 boolean wasInterrupted = beforeRead();
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71 try {
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72 return baseSortedMap().firstKey();
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73 }
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74 finally {
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75 afterRead(wasInterrupted);
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76 }
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77 }
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78
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79 public Object lastKey() {
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80 boolean wasInterrupted = beforeRead();
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81 try {
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82 return baseSortedMap().lastKey();
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83 }
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84 finally {
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85 afterRead(wasInterrupted);
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86 }
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87 }
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88
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89
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90 public SortedMap subMap(Object fromElement, Object toElement) {
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91 boolean wasInterrupted = beforeRead();
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92 try {
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93 return new SyncSortedMap(baseSortedMap().subMap(fromElement, toElement),
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94 rd_, wr_);
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95 }
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96 finally {
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97 afterRead(wasInterrupted);
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98 }
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99 }
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100
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101 public SortedMap headMap(Object toElement) {
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102 boolean wasInterrupted = beforeRead();
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103 try {
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104 return new SyncSortedMap(baseSortedMap().headMap(toElement),
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105 rd_, wr_);
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106 }
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107 finally {
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108 afterRead(wasInterrupted);
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109 }
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110 }
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111
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112 public SortedMap tailMap(Object fromElement) {
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113 boolean wasInterrupted = beforeRead();
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114 try {
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115 return new SyncSortedMap(baseSortedMap().tailMap(fromElement),
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116 rd_, wr_);
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117 }
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118 finally {
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119 afterRead(wasInterrupted);
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120 }
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121 }
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123 }
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125