1 /*
2 * Copyright 2000-2007 Sun Microsystems, Inc. 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. Sun designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22 * CA 95054 USA or visit www.sun.com if you need additional information or
23 * have any 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 * <p>
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 }
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