| author | psadhukhan |
| Tue, 18 Sep 2018 18:12:40 +0530 | |
| changeset 51927 | c88fd713b51c |
| parent 47216 | 71c04702a3d5 |
| child 52469 | 190b77982361 |
| permissions | -rw-r--r-- |
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<!-- |
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Copyright (c) 2003, 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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--> |
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"> |
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<html> |
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<body bgcolor="white"> |
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Provides the management interfaces for monitoring and management of the |
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Java virtual machine and other components in the Java runtime. |
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It allows both local and remote |
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monitoring and management of the running Java virtual machine. |
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<h3><a id="MXBean">Platform MXBean</a></h3> |
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<p> |
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A platform MXBean is a <i>managed bean</i> that |
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conforms to the {@linkplain javax.management JMX}
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Instrumentation Specification and only uses a set of basic data types. |
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Each platform MXBean is a {@link java.lang.management.PlatformManagedObject}
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with a unique |
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{@linkplain java.lang.management.PlatformManagedObject#getObjectName name}.
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<h3>ManagementFactory</h3> |
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<p>The {@link java.lang.management.ManagementFactory} class is the management
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factory class for the Java platform. This class provides a set of |
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static factory methods to obtain the MXBeans for the Java platform |
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to allow an application to access the MXBeans directly. |
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<p>A <em>platform MBeanServer</em> can be accessed with the |
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{@link java.lang.management.ManagementFactory#getPlatformMBeanServer
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getPlatformMBeanServer} method. On the first call to this method, |
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it creates the platform MBeanServer and registers all platform MXBeans |
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including {@linkplain java.lang.management.PlatformManagedObject
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platform MXBeans}. |
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Each platform MXBean is registered with a unique name defined in |
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the specification of the management interface. |
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This is a single MBeanServer that can be shared by different managed |
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components running within the same Java virtual machine. |
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<h3>Interoperability</h3> |
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<p>A management application and a platform MBeanServer of a running |
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virtual machine can interoperate |
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without requiring classes used by the platform MXBean interfaces. |
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The data types being transmitted between the JMX connector |
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server and the connector client are JMX |
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{@linkplain javax.management.openmbean.OpenType open types} and
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this allows interoperation across versions. |
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A data type used by the MXBean interfaces are mapped to an |
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open type when being accessed via MBeanServer interface. |
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See the <a href="{@docRoot}/javax/management/MXBean.html#MXBean-spec">
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MXBean</a> specification for details. |
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<h3><a id="examples">Ways to Access MXBeans</a></h3> |
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<p>An application can monitor the instrumentation of the |
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Java virtual machine and the runtime in the following ways: |
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<p> |
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<b>1. Direct access to an MXBean interface</b> |
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<ul> |
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<li>Get an MXBean instance locally in the running Java virtual machine: |
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<pre> |
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RuntimeMXBean mxbean = ManagementFactory.getRuntimeMXBean(); |
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// Get the standard attribute "VmVendor" |
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String vendor = mxbean.getVmVendor(); |
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</pre> |
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<p>Or by calling the |
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{@link java.lang.management.ManagementFactory#getPlatformMXBean(Class)
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getPlatformMXBean} or |
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{@link java.lang.management.ManagementFactory#getPlatformMXBeans(Class)
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getPlatformMXBeans} method: |
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<pre> |
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RuntimeMXBean mxbean = ManagementFactory.getPlatformMXBean(RuntimeMXBean.class); |
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// Get the standard attribute "VmVendor" |
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String vendor = mxbean.getVmVendor(); |
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</pre> |
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</li> |
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<li>Construct an MXBean proxy instance that forwards the |
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method calls to a given MBeanServer: |
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<pre> |
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MBeanServerConnection mbs; |
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// Connect to a running JVM (or itself) and get MBeanServerConnection |
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// that has the JVM MBeans registered in it |
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... |
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// Get a MBean proxy for RuntimeMXBean interface |
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RuntimeMXBean proxy = |
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{@link java.lang.management.ManagementFactory#getPlatformMXBean(MBeanServerConnection, Class)
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ManagementFactory.getPlatformMXBean}(mbs, |
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RuntimeMXBean.class); |
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// Get standard attribute "VmVendor" |
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String vendor = proxy.getVmVendor(); |
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</pre> |
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<p>A proxy is typically used to access an MXBean |
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in a remote Java virtual machine. |
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An alternative way to create an MXBean proxy is: |
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<pre> |
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RuntimeMXBean proxy = |
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{@link java.lang.management.ManagementFactory#newPlatformMXBeanProxy
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ManagementFactory.newPlatformMXBeanProxy}(mbs, |
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ManagementFactory.RUNTIME_MXBEAN_NAME, |
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RuntimeMXBean.class); |
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</pre> |
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</li> |
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</ul> |
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<p> |
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<b>2. Indirect access to an MXBean interface via MBeanServer</b> |
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<ul> |
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<li>Go through the |
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{@link java.lang.management.ManagementFactory#getPlatformMBeanServer
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platform MBeanServer} to access MXBeans locally or |
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a specific {@code MBeanServerConnection} to access
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MXBeans remotely. |
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The attributes and operations of an MXBean use only |
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<em>JMX open types</em> which include basic data types, |
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{@link javax.management.openmbean.CompositeData CompositeData},
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and {@link javax.management.openmbean.TabularData TabularData}
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defined in {@link javax.management.openmbean.OpenType OpenType}.
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<pre> |
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MBeanServerConnection mbs; |
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// Connect to a running JVM (or itself) and get MBeanServerConnection |
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// that has the JVM MXBeans registered in it |
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... |
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try {
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// Assuming the RuntimeMXBean has been registered in mbs |
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ObjectName oname = new ObjectName(ManagementFactory.RUNTIME_MXBEAN_NAME); |
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// Get standard attribute "VmVendor" |
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String vendor = (String) mbs.getAttribute(oname, "VmVendor"); |
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} catch (....) {
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// Catch the exceptions thrown by ObjectName constructor |
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// and MBeanServer.getAttribute method |
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... |
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} |
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</pre> |
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</li> |
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</ul> |
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<h3><a id="extension">Platform Extension</a></h3> |
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<p>A Java virtual machine implementation may add its platform extension to |
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the management interface by defining platform-dependent |
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interfaces that extend the standard management interfaces to include |
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platform-specific metrics and management operations. |
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The static factory methods in the <code>ManagementFactory</code> class will |
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return the MXBeans with the platform extension. |
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<p> |
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It is recommended to name the platform-specific attributes with |
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a vendor-specific prefix such as the vendor's name to |
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avoid collisions of the attribute name between the future extension |
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to the standard management interface and the platform extension. |
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If the future extension to the standard management interface defines |
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a new attribute for a management interface and the attribute name |
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is happened to be same as some vendor-specific attribute's name, |
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the applications accessing that vendor-specific attribute would have |
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to be modified to cope with versioning and compatibility issues. |
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<p>Below is an example showing how to access an attribute |
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from the platform extension: |
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<p> |
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1) Direct access to the Oracle-specific MXBean interface |
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<blockquote> |
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<pre> |
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List<com.sun.management.GarbageCollectorMXBean> mxbeans = |
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ManagementFactory.getPlatformMXBeans(com.sun.management.GarbageCollectorMXBean.class); |
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for (com.sun.management.GarbageCollectorMXBean gc : mxbeans) {
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// Get the standard attribute "CollectionCount" |
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String count = mxbean.getCollectionCount(); |
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// Get the platform-specific attribute "LastGcInfo" |
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GcInfo gcinfo = gc.getLastGcInfo(); |
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... |
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} |
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</pre> |
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</blockquote> |
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<p> |
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2) Access the Oracle-specific MXBean interface via <code>MBeanServer</code> |
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through proxy |
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<blockquote><pre> |
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MBeanServerConnection mbs; |
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// Connect to a running JVM (or itself) and get MBeanServerConnection |
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// that has the JVM MXBeans registered in it |
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... |
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List<com.sun.management.GarbageCollectorMXBean> mxbeans = |
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ManagementFactory.getPlatformMXBeans(mbs, com.sun.management.GarbageCollectorMXBean.class); |
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for (com.sun.management.GarbageCollectorMXBean gc : mxbeans) {
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// Get the standard attribute "CollectionCount" |
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String count = mxbean.getCollectionCount(); |
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// Get the platform-specific attribute "LastGcInfo" |
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GcInfo gcinfo = gc.getLastGcInfo(); |
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... |
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} |
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</pre></blockquote> |
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<p> Unless otherwise noted, passing a <code>null</code> argument to a constructor |
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or method in any class or interface in this package will cause a {@link
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java.lang.NullPointerException NullPointerException} to be thrown. |
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<p> The java.lang.management API is thread-safe. |
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@see {@linkplain javax.management JMX Specification}
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@author Mandy Chung |
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@since 1.5 |
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</body> |
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</html> |