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annotate src/EDU/oswego/cs/dl/util/concurrent/BoundedPriorityQueue.java @ 34:6f68e94c1fb8 default tip

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Add CondensedStats monitoring utility, equivalent to vmstat
author Dominic Cleal <dominic-cleal@cdo2.com>
date Thu, 05 Aug 2010 11:07:25 +0100
parents 3dc0c5604566
children
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0
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1 /*
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2 File: BoundedPriorityQueue.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 16Jun1998 dl Create public version
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12 25aug1998 dl added peek
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13 29aug1998 dl pulled heap mechanics into separate class
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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 import java.lang.reflect.*;
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19
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20 /**
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21 * A heap-based priority queue, using semaphores for
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22 * concurrency control.
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23 * The take operation returns the <em>least</em> element
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24 * with respect to the given ordering. (If more than
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25 * one element is tied for least value, one of them is
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26 * arbitrarily chosen to be returned -- no guarantees
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27 * are made for ordering across ties.)
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28 * Ordering follows the JDK1.2 collection
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29 * conventions: Either the elements must be Comparable, or
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30 * a Comparator must be supplied. Comparison failures throw
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31 * ClassCastExceptions during insertions and extractions.
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32 * The implementation uses a standard array-based heap algorithm,
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33 * as described in just about any data structures textbook.
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34 * <p>
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35 * Put and take operations may throw ClassCastException
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36 * if elements are not Comparable, or
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37 * not comparable using the supplied comparator.
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38 * Since not all elements are compared on each operation
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39 * it is possible that an exception will not be thrown
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40 * during insertion of non-comparable element, but will later be
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41 * encountered during another insertion or extraction.
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42 * <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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43 **/
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44
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45 public class BoundedPriorityQueue extends SemaphoreControlledChannel {
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46 protected final Heap heap_;
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47
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48 /**
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49 * Create a priority queue with the given capacity and comparator
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50 * @exception IllegalArgumentException if capacity less or equal to zero
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51 **/
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52
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53 public BoundedPriorityQueue(int capacity, Comparator cmp)
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54 throws IllegalArgumentException {
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55 super(capacity);
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56 heap_ = new Heap(capacity, cmp);
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57 }
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58
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59 /**
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60 * Create a priority queue with the current default capacity
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61 * and the given comparator
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62 **/
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63
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64 public BoundedPriorityQueue(Comparator comparator) {
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65 this(DefaultChannelCapacity.get(), comparator);
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66 }
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67
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68 /**
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69 * Create a priority queue with the given capacity,
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70 * and relying on natural ordering.
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71 **/
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72
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73 public BoundedPriorityQueue(int capacity) {
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74 this(capacity, null);
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75 }
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76
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77 /**
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78 * Create a priority queue with the current default capacity
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79 * and relying on natural ordering.
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80 **/
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81
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82 public BoundedPriorityQueue() {
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83 this(DefaultChannelCapacity.get(), null);
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84 }
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85
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86
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87 /**
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88 * Create a priority queue with the given capacity and comparator, using
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89 * the supplied Semaphore class for semaphores.
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90 * @exception IllegalArgumentException if capacity less or equal to zero
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91 * @exception NoSuchMethodException If class does not have constructor
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92 * that intializes permits
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93 * @exception SecurityException if constructor information
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94 * not accessible
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95 * @exception InstantiationException if semaphore class is abstract
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96 * @exception IllegalAccessException if constructor cannot be called
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97 * @exception InvocationTargetException if semaphore constructor throws an
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98 * exception
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99 **/
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100
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101 public BoundedPriorityQueue(int capacity, Comparator cmp,
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102 Class semaphoreClass)
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103 throws IllegalArgumentException,
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104 NoSuchMethodException,
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105 SecurityException,
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106 InstantiationException,
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107 IllegalAccessException,
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108 InvocationTargetException {
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109 super(capacity, semaphoreClass);
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110 heap_ = new Heap(capacity, cmp);
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111 }
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112
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113 protected void insert(Object x) { heap_.insert(x); }
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114 protected Object extract() { return heap_.extract(); }
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115 public Object peek() { return heap_.peek(); }
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116
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117 }