1 // ======================================================================== 2 // Copyright (c) Webtide LLC 3 // ------------------------------------------------------------------------ 4 // All rights reserved. This program and the accompanying materials 5 // are made available under the terms of the Eclipse Public License v1.0 6 // and Apache License v2.0 which accompanies this distribution. 7 // The Eclipse Public License is available at 8 // http://www.eclipse.org/legal/epl-v10.html 9 // The Apache License v2.0 is available at 10 // http://www.opensource.org/licenses/apache2.0.php 11 // You may elect to redistribute this code under either of these licenses. 12 // ======================================================================== 13 14 15 package org.eclipse.jetty.monitor.triggers; 16 17 import javax.management.MalformedObjectNameException; 18 19 20 /* ------------------------------------------------------------ */ 21 /** 22 * RangeAttrEventTrigger 23 * 24 * Event trigger that polls a value of an MXBean attribute and 25 * checks if it is in a range from specified min value to 26 * specified max value. 27 */ 28 public class RangeAttrEventTrigger<TYPE extends Comparable<TYPE>> extends AttrEventTrigger<TYPE> 29 { 30 protected final TYPE _min; 31 protected final TYPE _max; 32 33 /* ------------------------------------------------------------ */ 34 /** 35 * Construct event trigger and specify the MXBean attribute 36 * that will be polled by this event trigger as well as min 37 * and max value of the attribute. 38 * 39 * @param objectName object name of an MBean to be polled 40 * @param attributeName name of an MBean attribute to be polled 41 * @param min minimum value of the attribute 42 * @param max maximum value of the attribute 43 * 44 * @throws MalformedObjectNameException 45 * @throws IllegalArgumentException 46 */ 47 public RangeAttrEventTrigger(String objectName, String attributeName,TYPE min, TYPE max) 48 throws MalformedObjectNameException, IllegalArgumentException 49 { 50 super(objectName,attributeName); 51 52 if (min == null) 53 throw new IllegalArgumentException("Value cannot be null"); 54 if (max == null) 55 throw new IllegalArgumentException("Value cannot be null"); 56 57 _min = min; 58 _max = max; 59 } 60 61 /* ------------------------------------------------------------ */ 62 /** 63 * Compare the value of the MXBean attribute being polling 64 * to check if it is in a range from specified min value to 65 * specified max value. 66 * 67 * @see org.eclipse.jetty.monitor.triggers.AttrEventTrigger#match(java.lang.Comparable) 68 */ 69 @Override 70 public boolean match(Comparable<TYPE> value) 71 { 72 return (value.compareTo(_min) > 0) &&(value.compareTo(_max) < 0); 73 } 74 75 /* ------------------------------------------------------------ */ 76 /** 77 * Returns the string representation of this event trigger 78 * in the format "min<name<max". 79 * 80 * @return string representation of the event trigger 81 * 82 * @see java.lang.Object#toString() 83 */ 84 public String toString() 85 { 86 StringBuilder result = new StringBuilder(); 87 88 result.append(_min); 89 result.append("<"); 90 result.append(getNameString()); 91 result.append("<"); 92 result.append(_max); 93 94 return result.toString(); 95 } 96 }