1 // 2 // ======================================================================== 3 // Copyright (c) 1995-2016 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 package org.eclipse.jetty.monitor.triggers; 20 21 import javax.management.MalformedObjectNameException; 22 23 /** 24 * GreaterThanAttrEventTrigger 25 * <p> 26 * Event trigger that polls a value of an MXBean attribute and 27 * checks if it is greater than specified min value. 28 * @param <TYPE> event trigger type 29 */ 30 public class GreaterThanAttrEventTrigger<TYPE extends Comparable<TYPE>> extends AttrEventTrigger<TYPE> 31 { 32 protected final TYPE _min; 33 34 /* ------------------------------------------------------------ */ 35 /** 36 * Construct event trigger and specify the MXBean attribute 37 * that will be polled by this event trigger as well as min 38 * value of the attribute. 39 * 40 * @param objectName object name of an MBean to be polled 41 * @param attributeName name of an MBean attribute to be polled 42 * @param min minimum value of the attribute 43 * 44 * @throws MalformedObjectNameException on bad object name 45 * @throws IllegalArgumentException on bad parameters 46 */ 47 public GreaterThanAttrEventTrigger(String objectName, String attributeName, TYPE min) 48 throws MalformedObjectNameException, IllegalArgumentException 49 { 50 super(objectName,attributeName); 51 52 if (min == null) 53 throw new IllegalArgumentException("Value cannot be null"); 54 55 _min = min; 56 } 57 58 /* ------------------------------------------------------------ */ 59 /** 60 * Compare the value of the MXBean attribute being polling 61 * to check if it is greater than the min value. 62 * 63 * @see org.eclipse.jetty.monitor.triggers.AttrEventTrigger#match(java.lang.Comparable) 64 */ 65 @Override 66 public boolean match(Comparable<TYPE> value) 67 { 68 return (value.compareTo(_min) > 0); 69 } 70 71 /* ------------------------------------------------------------ */ 72 /** 73 * Returns the string representation of this event trigger 74 * in the format "min<name". 75 * 76 * @return string representation of the event trigger 77 * 78 * @see java.lang.Object#toString() 79 */ 80 public String toString() 81 { 82 StringBuilder result = new StringBuilder(); 83 84 result.append(_min); 85 result.append("<"); 86 result.append(getNameString()); 87 88 return result.toString(); 89 } 90 }