1 /* 2 * Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 27 package javax.management.openmbean; 28 29 30 // java import 31 // 32 33 34 // jmx import 35 // 36 import javax.management.MBeanParameterInfo; 37 38 /** 39 * <p>Describes an operation of an Open MBean.</p> 40 * 41 * <p>This interface declares the same methods as the class {@link 42 * javax.management.MBeanOperationInfo}. A class implementing this 43 * interface (typically {@link OpenMBeanOperationInfoSupport}) should 44 * extend {@link javax.management.MBeanOperationInfo}.</p> 45 * 46 * <p>The {@link #getSignature()} method should return at runtime an 47 * array of instances of a subclass of {@link MBeanParameterInfo} 48 * which implements the {@link OpenMBeanParameterInfo} interface 49 * (typically {@link OpenMBeanParameterInfoSupport}).</p> 50 * 51 * 52 * @since 1.5 53 */ 54 public interface OpenMBeanOperationInfo { 55 56 // Re-declares fields and methods that are in class MBeanOperationInfo of JMX 1.0 57 // (fields and methods will be removed when MBeanOperationInfo is made a parent interface of this interface) 58 59 /** 60 * Returns a human readable description of the operation 61 * described by this <tt>OpenMBeanOperationInfo</tt> instance. 62 * 63 * @return the description. 64 */ 65 public String getDescription() ; 66 67 /** 68 * Returns the name of the operation 69 * described by this <tt>OpenMBeanOperationInfo</tt> instance. 70 * 71 * @return the name. 72 */ 73 public String getName() ; 74 75 /** 76 * Returns an array of <tt>OpenMBeanParameterInfo</tt> instances 77 * describing each parameter in the signature of the operation 78 * described by this <tt>OpenMBeanOperationInfo</tt> instance. 79 * Each instance in the returned array should actually be a 80 * subclass of <tt>MBeanParameterInfo</tt> which implements the 81 * <tt>OpenMBeanParameterInfo</tt> interface (typically {@link 82 * OpenMBeanParameterInfoSupport}). 83 * 84 * @return the signature. 85 */ 86 public MBeanParameterInfo[] getSignature() ; 87 88 /** 89 * Returns an <tt>int</tt> constant qualifying the impact of the 90 * operation described by this <tt>OpenMBeanOperationInfo</tt> 91 * instance. 92 * 93 * The returned constant is one of {@link 94 * javax.management.MBeanOperationInfo#INFO}, {@link 95 * javax.management.MBeanOperationInfo#ACTION}, {@link 96 * javax.management.MBeanOperationInfo#ACTION_INFO}, or {@link 97 * javax.management.MBeanOperationInfo#UNKNOWN}. 98 * 99 * @return the impact code. 100 */ 101 public int getImpact() ; 102 103 /** 104 * Returns the fully qualified Java class name of the values 105 * returned by the operation described by this 106 * <tt>OpenMBeanOperationInfo</tt> instance. This method should 107 * return the same value as a call to 108 * <tt>getReturnOpenType().getClassName()</tt>. 109 * 110 * @return the return type. 111 */ 112 public String getReturnType() ; 113 114 115 // Now declares methods that are specific to open MBeans 116 // 117 118 /** 119 * Returns the <i>open type</i> of the values returned by the 120 * operation described by this <tt>OpenMBeanOperationInfo</tt> 121 * instance. 122 * 123 * @return the return type. 124 */ 125 public OpenType<?> getReturnOpenType() ; // open MBean specific method 126 127 128 // commodity methods 129 // 130 131 /** 132 * Compares the specified <var>obj</var> parameter with this <code>OpenMBeanOperationInfo</code> instance for equality. 133 * <p> 134 * Returns <tt>true</tt> if and only if all of the following statements are true: 135 * <ul> 136 * <li><var>obj</var> is non null,</li> 137 * <li><var>obj</var> also implements the <code>OpenMBeanOperationInfo</code> interface,</li> 138 * <li>their names are equal</li> 139 * <li>their signatures are equal</li> 140 * <li>their return open types are equal</li> 141 * <li>their impacts are equal</li> 142 * </ul> 143 * This ensures that this <tt>equals</tt> method works properly for <var>obj</var> parameters which are 144 * different implementations of the <code>OpenMBeanOperationInfo</code> interface. 145 * <br> 146 * @param obj the object to be compared for equality with this <code>OpenMBeanOperationInfo</code> instance; 147 * 148 * @return <code>true</code> if the specified object is equal to this <code>OpenMBeanOperationInfo</code> instance. 149 */ 150 public boolean equals(Object obj); 151 152 /** 153 * Returns the hash code value for this <code>OpenMBeanOperationInfo</code> instance. 154 * <p> 155 * The hash code of an <code>OpenMBeanOperationInfo</code> instance is the sum of the hash codes 156 * of all elements of information used in <code>equals</code> comparisons 157 * (ie: its name, return open type, impact and signature, where the signature hashCode is calculated by a call to 158 * <tt>java.util.Arrays.asList(this.getSignature).hashCode()</tt>). 159 * <p> 160 * This ensures that <code> t1.equals(t2) </code> implies that <code> t1.hashCode()==t2.hashCode() </code> 161 * for any two <code>OpenMBeanOperationInfo</code> instances <code>t1</code> and <code>t2</code>, 162 * as required by the general contract of the method 163 * {@link Object#hashCode() Object.hashCode()}. 164 * 165 * 166 * @return the hash code value for this <code>OpenMBeanOperationInfo</code> instance 167 */ 168 public int hashCode(); 169 170 /** 171 * Returns a string representation of this <code>OpenMBeanOperationInfo</code> instance. 172 * <p> 173 * The string representation consists of the name of this class (ie <code>javax.management.openmbean.OpenMBeanOperationInfo</code>), 174 * and the name, signature, return open type and impact of the described operation. 175 * 176 * @return a string representation of this <code>OpenMBeanOperationInfo</code> instance 177 */ 178 public String toString(); 179 180 }