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1 /* 2 * Copyright (c) 2004, Bruce Lowery 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are met: 7 * 8 * - Redistributions of source code must retain the above copyright notice, 9 * this list of conditions and the following disclaimer. 10 * - Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * - Neither the name of JEGG nor the names of its contributors may be used 14 * to endorse or promote products derived from this software without 15 * specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 21 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 25 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 27 * POSSIBILITY OF SUCH DAMAGE. 28 */ 29 package jegg; 30 31 /*** 32 * Enumeration of the dispatch priorities that may be assigned to 33 * a message being sent from one egg to another. Queued messages with a higher 34 * priority are dispatched ahead of lower priority messages. 35 */ 36 public final class Priority implements Comparable 37 { 38 /*** The highest dispatch priority */ 39 public static final Priority HIGH = new Priority(10); 40 /*** The normal dispatch priority */ 41 public static final Priority MEDIUM = new Priority(5); 42 /*** The lowest dispatch priority */ 43 public static final Priority LOW = new Priority(1); 44 45 /*** The numeric value of this priority */ 46 private int level = 0; 47 48 /*** 49 * Construct a dispatch priority. 50 * @param lvl the value to assign the new priority (the higher the value, the 51 * higher the priority). 52 */ 53 private Priority(int lvl) 54 { 55 level = lvl; 56 } 57 58 /*** 59 * Implementation of the {@link java.lang.Comparable Comparable} interface 60 * that that priorities will be properly handled by a sorted set. 61 */ 62 public int compareTo(Object o) 63 { 64 if (!(o instanceof Priority)) 65 { 66 throw new IllegalArgumentException("not a Priority instance"); 67 } 68 Priority p = (Priority) o; 69 return p.level - level; 70 } 71 } 72

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