Mercurial > hg > blitz_condensed
annotate src/EDU/oswego/cs/dl/util/concurrent/Heap.java @ 34:6f68e94c1fb8 default tip
Add CondensedStats monitoring utility, equivalent to vmstat
author | Dominic Cleal <dominic-cleal@cdo2.com> |
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date | Thu, 05 Aug 2010 11:07:25 +0100 |
parents | 3dc0c5604566 |
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0
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1 /* |
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2 File: Heap.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 29Aug1998 dl Refactored from BoundedPriorityQueue |
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12 08dec2001 dl Null out slots of removed items |
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13 03feb2002 dl Also null out in clear |
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14 */ |
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15 |
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16 package EDU.oswego.cs.dl.util.concurrent; |
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17 import java.util.Comparator; |
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18 |
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19 /** |
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20 * A heap-based priority queue, without any concurrency control |
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21 * (i.e., no blocking on empty/full states). |
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22 * This class provides the data structure mechanics for BoundedPriorityQueue. |
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23 * <p> |
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24 * The class currently uses a standard array-based heap, as described |
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25 * in, for example, Sedgewick's Algorithms text. All methods |
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26 * are fully synchronized. In the future, |
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27 * it may instead use structures permitting finer-grained locking. |
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28 * <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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29 **/ |
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30 |
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31 public class Heap { |
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32 protected Object[] nodes_; // the tree nodes, packed into an array |
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33 protected int count_ = 0; // number of used slots |
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34 protected final Comparator cmp_; // for ordering |
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35 |
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36 /** |
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37 * Create a Heap with the given initial capacity and comparator |
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38 * @exception IllegalArgumentException if capacity less or equal to zero |
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39 **/ |
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40 |
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41 public Heap(int capacity, Comparator cmp) |
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42 throws IllegalArgumentException { |
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43 if (capacity <= 0) throw new IllegalArgumentException(); |
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44 nodes_ = new Object[capacity]; |
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45 cmp_ = cmp; |
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46 } |
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47 |
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48 /** |
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49 * Create a Heap with the given capacity, |
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50 * and relying on natural ordering. |
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51 **/ |
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52 |
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53 public Heap(int capacity) { |
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54 this(capacity, null); |
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55 } |
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56 |
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57 |
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58 /** perform element comaprisons using comparator or natural ordering **/ |
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59 protected int compare(Object a, Object b) { |
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60 if (cmp_ == null) |
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61 return ((Comparable)a).compareTo(b); |
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62 else |
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63 return cmp_.compare(a, b); |
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64 } |
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65 |
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66 |
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67 // indexes of heap parents and children |
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68 protected final int parent(int k) { return (k - 1) / 2; } |
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69 protected final int left(int k) { return 2 * k + 1; } |
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70 protected final int right(int k) { return 2 * (k + 1); } |
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71 |
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72 /** |
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73 * insert an element, resize if necessary |
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74 **/ |
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75 public synchronized void insert(Object x) { |
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76 if (count_ >= nodes_.length) { |
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77 int newcap = 3 * nodes_.length / 2 + 1; |
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78 Object[] newnodes = new Object[newcap]; |
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79 System.arraycopy(nodes_, 0, newnodes, 0, nodes_.length); |
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80 nodes_ = newnodes; |
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81 } |
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82 |
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83 int k = count_; |
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84 ++count_; |
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85 while (k > 0) { |
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86 int par = parent(k); |
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87 if (compare(x, nodes_[par]) < 0) { |
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88 nodes_[k] = nodes_[par]; |
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89 k = par; |
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90 } |
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91 else break; |
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92 } |
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93 nodes_[k] = x; |
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94 } |
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95 |
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96 |
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97 /** |
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98 * Return and remove least element, or null if empty |
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99 **/ |
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100 |
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101 public synchronized Object extract() { |
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102 if (count_ < 1) return null; |
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103 |
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104 int k = 0; // take element at root; |
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105 Object least = nodes_[k]; |
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106 --count_; |
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107 Object x = nodes_[count_]; |
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108 nodes_[count_] = null; |
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109 for (;;) { |
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110 int l = left(k); |
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111 if (l >= count_) |
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112 break; |
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113 else { |
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114 int r = right(k); |
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115 int child = (r >= count_ || compare(nodes_[l], nodes_[r]) < 0)? l : r; |
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116 if (compare(x, nodes_[child]) > 0) { |
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117 nodes_[k] = nodes_[child]; |
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118 k = child; |
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119 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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120 else break; |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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121 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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122 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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123 nodes_[k] = x; |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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124 return least; |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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125 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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126 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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127 /** Return least element without removing it, or null if empty **/ |
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128 public synchronized Object peek() { |
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129 if (count_ > 0) |
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130 return nodes_[0]; |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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131 else |
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132 return null; |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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133 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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134 |
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135 /** Return number of elements **/ |
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136 public synchronized int size() { |
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137 return count_; |
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138 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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139 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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140 /** remove all elements **/ |
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141 public synchronized void clear() { |
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142 for (int i = 0; i < count_; ++i) |
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143 nodes_[i] = null; |
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144 count_ = 0; |
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145 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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146 |
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147 } |