1 // 2 // ======================================================================== 3 // Copyright (c) 1995-2013 Mort Bay Consulting Pty. Ltd. 4 // ------------------------------------------------------------------------ 5 // All rights reserved. This program and the accompanying materials 6 // are made available under the terms of the Eclipse Public License v1.0 7 // and Apache License v2.0 which accompanies this distribution. 8 // 9 // The Eclipse Public License is available at 10 // http://www.eclipse.org/legal/epl-v10.html 11 // 12 // The Apache License v2.0 is available at 13 // http://www.opensource.org/licenses/apache2.0.php 14 // 15 // You may elect to redistribute this code under either of these licenses. 16 // ======================================================================== 17 // 18 19 20 package org.eclipse.jetty.monitor.triggers; 21 22 import javax.management.MalformedObjectNameException; 23 24 25 /* ------------------------------------------------------------ */ 26 /** 27 * LessThanAttrEventTrigger 28 * 29 * Event trigger that polls a value of an MXBean attribute and 30 * checks if it is greater than specified max value. 31 */ 32 public class LessThanAttrEventTrigger<TYPE extends Comparable<TYPE>> extends AttrEventTrigger<TYPE> 33 { 34 protected final TYPE _max; 35 36 /* ------------------------------------------------------------ */ 37 /** 38 * Construct event trigger and specify the MXBean attribute 39 * that will be polled by this event trigger as well as max 40 * value of the attribute. 41 * 42 * @param objectName object name of an MBean to be polled 43 * @param attributeName name of an MBean attribute to be polled 44 * @param max maximum value of the attribute 45 * 46 * @throws MalformedObjectNameException 47 * @throws IllegalArgumentException 48 */ 49 public LessThanAttrEventTrigger(String objectName, String attributeName, TYPE max) 50 throws MalformedObjectNameException, IllegalArgumentException 51 { 52 super(objectName,attributeName); 53 54 if (max == null) 55 throw new IllegalArgumentException("Value cannot be null"); 56 57 _max = max; 58 } 59 60 /* ------------------------------------------------------------ */ 61 /** 62 * Compare the value of the MXBean attribute being polling 63 * to check if it is less than the min value. 64 * 65 * @see org.eclipse.jetty.monitor.triggers.AttrEventTrigger#match(java.lang.Comparable) 66 */ 67 @Override 68 public boolean match(Comparable<TYPE> value) 69 { 70 return (value.compareTo(_max) < 0); 71 } 72 73 /* ------------------------------------------------------------ */ 74 /** 75 * Returns the string representation of this event trigger 76 * in the format "name<max". 77 * 78 * @return string representation of the event trigger 79 * 80 * @see java.lang.Object#toString() 81 */ 82 public String toString() 83 { 84 StringBuilder result = new StringBuilder(); 85 86 result.append(getNameString()); 87 result.append("<"); 88 result.append(_max); 89 90 return result.toString(); 91 } 92 }