| author | uvangapally |
| Tue, 01 Aug 2017 10:33:47 +0530 | |
| changeset 46050 | f51c14dc540f |
| parent 44858 | 7183899b064b |
| permissions | -rw-r--r-- |
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<title>javax.management.modelmbean package</title> |
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Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved. |
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DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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This code is free software; you can redistribute it and/or modify it |
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under the terms of the GNU General Public License version 2 only, as |
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published by the Free Software Foundation. Oracle designates this |
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particular file as subject to the "Classpath" exception as provided |
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by Oracle in the LICENSE file that accompanied this code. |
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This code is distributed in the hope that it will be useful, but WITHOUT |
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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version 2 for more details (a copy is included in the LICENSE file that |
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accompanied this code). |
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You should have received a copy of the GNU General Public License version |
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2 along with this work; if not, write to the Free Software Foundation, |
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Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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or visit www.oracle.com if you need additional information or have any |
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questions. |
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</head> |
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<body bgcolor="white"> |
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<p>Provides the definition of the ModelMBean classes. A Model |
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MBean is an MBean that acts as a bridge between the management |
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interface and the underlying managed resource. Both the |
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management interface and the managed resource are specified as |
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Java objects. The same Model MBean implementation can be |
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reused many times with different management interfaces and |
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managed resources, and it can provide common functionality |
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such as persistence and caching.</p> |
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<p>A Model MBean implements the {@link
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javax.management.modelmbean.ModelMBean ModelMBean} interface. |
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It is a {@link javax.management.DynamicMBean DynamicMBean}
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whose {@link javax.management.DynamicMBean#getMBeanInfo()
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getMBeanInfo} method returns an object implementing {@link
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javax.management.modelmbean.ModelMBeanInfo |
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ModelMBeanInfo}.</p> |
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<p>Every MBean has an {@link javax.management.MBeanInfo
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MBeanInfo} with information about the MBean itself, and its |
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attributes, operations, constructors, and notifications. A |
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Model MBean augments this <code>MBeanInfo</code> with {@link
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javax.management.Descriptor Descriptor}s that encode |
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additional information in the form of (key,value) pairs. |
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Usually, <code>Descriptor</code>s are instances of {@link
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javax.management.modelmbean.DescriptorSupport |
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DescriptorSupport}.</p> |
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<p>The class {@link
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javax.management.modelmbean.RequiredModelMBean |
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RequiredModelMBean} provides a standard Model MBean |
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implementation.</p> |
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<p>The following example shows a Model MBean being used to make |
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the <code>get</code> method of a <code>HashMap</code> |
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available for management through an MBean server. No other |
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methods are available through the MBean server. There is |
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nothing special about <code>HashMap</code> here. Public |
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methods from any public class can be exposed for management in |
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the same way.</p> |
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<pre> |
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import java.lang.reflect.Method; |
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import java.util.HashMap; |
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import javax.management.*; |
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import javax.management.modelmbean.*; |
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// ... |
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MBeanServer mbs = MBeanServerFactory.createMBeanServer(); |
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// The MBean Server |
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HashMap map = new HashMap(); |
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// The resource that will be managed |
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// Construct the management interface for the Model MBean |
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Method getMethod = HashMap.class.getMethod("get", new Class[] {Object.class});
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ModelMBeanOperationInfo getInfo = |
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new ModelMBeanOperationInfo("Get value for key", getMethod);
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ModelMBeanInfo mmbi = |
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new ModelMBeanInfoSupport(HashMap.class.getName(), |
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"Map of keys and values", |
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null, // no attributes |
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null, // no constructors |
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new ModelMBeanOperationInfo[] {getInfo},
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null); // no notifications |
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// Make the Model MBean and link it to the resource |
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ModelMBean mmb = new RequiredModelMBean(mmbi); |
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mmb.setManagedResource(map, "ObjectReference"); |
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// Register the Model MBean in the MBean Server |
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ObjectName mapName = new ObjectName(":type=Map,name=whatever");
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mbs.registerMBean(mmb, mapName); |
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// Resource can evolve independently of the MBean |
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map.put("key", "value");
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// Can access the "get" method through the MBean Server |
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mbs.invoke(mapName, "get", new Object[] {"key"}, new String[] {Object.class.getName()});
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// returns "value" |
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</pre> |
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<h2><a id="spec">Package Specification</a></h2> |
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<ul> |
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<li>See the <i>JMX 1.4 Specification</i> |
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<a href="https://jcp.org/aboutJava/communityprocess/mrel/jsr160/index2.html"> |
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JMX Specification, version 1.4</a> |
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</ul> |
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@since 1.5 |
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