JDK8/Java8源码在线阅读
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package java.lang.management;
import javax.management.DynamicMBean;
import javax.management.MBeanServer;
import javax.management.MBeanServerConnection;
import javax.management.MBeanServerFactory;
import javax.management.MBeanServerPermission;
import javax.management.NotificationEmitter;
import javax.management.ObjectInstance;
import javax.management.ObjectName;
import javax.management.InstanceAlreadyExistsException;
import javax.management.InstanceNotFoundException;
import javax.management.MalformedObjectNameException;
import javax.management.MBeanRegistrationException;
import javax.management.NotCompliantMBeanException;
import javax.management.StandardEmitterMBean;
import javax.management.StandardMBean;
import java.util.Collections;
import java.util.List;
import java.util.Set;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.security.AccessController;
import java.security.Permission;
import java.security.PrivilegedAction;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import javax.management.JMX;
import sun.management.ManagementFactoryHelper;
import sun.management.ExtendedPlatformComponent;
/**
* The {@code ManagementFactory} class is a factory class for getting
* managed beans for the Java platform.
* This class consists of static methods each of which returns
* one or more <i>platform MXBeans</i> representing
* the management interface of a component of the Java virtual
* machine.
*
* <h3><a name="MXBean">Platform MXBeans</a></h3>
* <p>
* A platform MXBean is a <i>managed bean</i> that
* conforms to the <a href="../../../javax/management/package-summary.html">JMX</a>
* Instrumentation Specification and only uses a set of basic data types.
* A JMX management application and the {@linkplain
* #getPlatformMBeanServer platform MBeanServer}
* can interoperate without requiring classes for MXBean specific
* data types.
* The data types being transmitted between the JMX connector
* server and the connector client are
* {@linkplain javax.management.openmbean.OpenType open types}
* and this allows interoperation across versions.
* See <a href="../../../javax/management/MXBean.html#MXBean-spec">
* the specification of MXBeans</a> for details.
*
* <a name="MXBeanNames"></a>
* <p>Each platform MXBean is a {@link PlatformManagedObject}
* and it has a unique
* {@link javax.management.ObjectName ObjectName} for
* registration in the platform {@code MBeanServer} as returned by
* by the {@link PlatformManagedObject#getObjectName getObjectName}
* method.
*
* <p>
* An application can access a platform MXBean in the following ways:
* <h4>1. Direct access to an MXBean interface</h4>
* <blockquote>
* <ul>
* <li>Get an MXBean instance by calling the
* {@link #getPlatformMXBean(Class) getPlatformMXBean} or
* {@link #getPlatformMXBeans(Class) getPlatformMXBeans} method
* and access the MXBean locally in the running
* virtual machine.
* </li>
* <li>Construct an MXBean proxy instance that forwards the
* method calls to a given {@link MBeanServer MBeanServer} by calling
* the {@link #getPlatformMXBean(MBeanServerConnection, Class)} or
* {@link #getPlatformMXBeans(MBeanServerConnection, Class)} method.
* The {@link #newPlatformMXBeanProxy newPlatformMXBeanProxy} method
* can also be used to construct an MXBean proxy instance of
* a given {@code ObjectName}.
* A proxy is typically constructed to remotely access
* an MXBean of another running virtual machine.
* </li>
* </ul>
* <h4>2. Indirect access to an MXBean interface via MBeanServer</h4>
* <ul>
* <li>Go through the platform {@code MBeanServer} to access MXBeans
* locally or a specific <tt>MBeanServerConnection</tt> to access
* MXBeans remotely.
* The attributes and operations of an MXBean use only
* <em>JMX open types</em> which include basic data types,
* {@link javax.management.openmbean.CompositeData CompositeData},
* and {@link javax.management.openmbean.TabularData TabularData}
* defined in
* {@link javax.management.openmbean.OpenType OpenType}.
* The mapping is specified in
* the {@linkplain javax.management.MXBean MXBean} specification
* for details.
* </li>
* </ul>
* </blockquote>
*
* <p>
* The {@link #getPlatformManagementInterfaces getPlatformManagementInterfaces}
* method returns all management interfaces supported in the Java virtual machine
* including the standard management interfaces listed in the tables
* below as well as the management interfaces extended by the JDK implementation.
* <p>
* A Java virtual machine has a single instance of the following management
* interfaces:
*
* <blockquote>
* <table border summary="The list of Management Interfaces and their single instances">
* <tr>
* <th>Management Interface</th>
* <th>ObjectName</th>
* </tr>
* <tr>
* <td> {@link ClassLoadingMXBean} </td>
* <td> {@link #CLASS_LOADING_MXBEAN_NAME
* java.lang:type=ClassLoading}</td>
* </tr>
* <tr>
* <td> {@link MemoryMXBean} </td>
* <td> {@link #MEMORY_MXBEAN_NAME
* java.lang:type=Memory}</td>
* </tr>
* <tr>
* <td> {@link ThreadMXBean} </td>
* <td> {@link #THREAD_MXBEAN_NAME
* java.lang:type=Threading}</td>
* </tr>
* <tr>
* <td> {@link RuntimeMXBean} </td>
* <td> {@link #RUNTIME_MXBEAN_NAME
* java.lang:type=Runtime}</td>
* </tr>
* <tr>
* <td> {@link OperatingSystemMXBean} </td>
* <td> {@link #OPERATING_SYSTEM_MXBEAN_NAME
* java.lang:type=OperatingSystem}</td>
* </tr>
* <tr>
* <td> {@link PlatformLoggingMXBean} </td>
* <td> {@link java.util.logging.LogManager#LOGGING_MXBEAN_NAME
* java.util.logging:type=Logging}</td>
* </tr>
* </table>
* </blockquote>
*
* <p>
* A Java virtual machine has zero or a single instance of
* the following management interfaces.
*
* <blockquote>
* <table border summary="The list of Management Interfaces and their single instances">
* <tr>
* <th>Management Interface</th>
* <th>ObjectName</th>
* </tr>
* <tr>
* <td> {@link CompilationMXBean} </td>
* <td> {@link #COMPILATION_MXBEAN_NAME
* java.lang:type=Compilation}</td>
* </tr>
* </table>
* </blockquote>
*
* <p>
* A Java virtual machine may have one or more instances of the following
* management interfaces.
* <blockquote>
* <table border summary="The list of Management Interfaces and their single instances">
* <tr>
* <th>Management Interface</th>
* <th>ObjectName</th>
* </tr>
* <tr>
* <td> {@link GarbageCollectorMXBean} </td>
* <td> {@link #GARBAGE_COLLECTOR_MXBEAN_DOMAIN_TYPE
* java.lang:type=GarbageCollector}<tt>,name=</tt><i>collector's name</i></td>
* </tr>
* <tr>
* <td> {@link MemoryManagerMXBean} </td>
* <td> {@link #MEMORY_MANAGER_MXBEAN_DOMAIN_TYPE
* java.lang:type=MemoryManager}<tt>,name=</tt><i>manager's name</i></td>
* </tr>
* <tr>
* <td> {@link MemoryPoolMXBean} </td>
* <td> {@link #MEMORY_POOL_MXBEAN_DOMAIN_TYPE
* java.lang:type=MemoryPool}<tt>,name=</tt><i>pool's name</i></td>
* </tr>
* <tr>
* <td> {@link BufferPoolMXBean} </td>
* <td> {@code java.nio:type=BufferPool,name=}<i>pool name</i></td>
* </tr>
* </table>
* </blockquote>
*
* @see <a href="../../../javax/management/package-summary.html">
* JMX Specification</a>
* @see <a href="package-summary.html#examples">
* Ways to Access Management Metrics</a>
* @see javax.management.MXBean
*
* @author Mandy Chung
* @since 1.5
*/
public class ManagementFactory {
// A class with only static fields and methods.
private ManagementFactory() {};
/**
* String representation of the
* <tt>ObjectName</tt> for the {@link ClassLoadingMXBean}.
*/
public final static String CLASS_LOADING_MXBEAN_NAME =
"java.lang:type=ClassLoading";
/**
* String representation of the
* <tt>ObjectName</tt> for the {@link CompilationMXBean}.
*/
public final static String COMPILATION_MXBEAN_NAME =
"java.lang:type=Compilation";
/**
* String representation of the
* <tt>ObjectName</tt> for the {@link MemoryMXBean}.
*/
public final static String MEMORY_MXBEAN_NAME =
"java.lang:type=Memory";
/**
* String representation of the
* <tt>ObjectName</tt> for the {@link OperatingSystemMXBean}.
*/
public final static String OPERATING_SYSTEM_MXBEAN_NAME =
"java.lang:type=OperatingSystem";
/**
* String representation of the
* <tt>ObjectName</tt> for the {@link RuntimeMXBean}.
*/
public final static String RUNTIME_MXBEAN_NAME =
"java.lang:type=Runtime";
/**
* String representation of the
* <tt>ObjectName</tt> for the {@link ThreadMXBean}.
*/
public final static String THREAD_MXBEAN_NAME =
"java.lang:type=Threading";
/**
* The domain name and the type key property in
* the <tt>ObjectName</tt> for a {@link GarbageCollectorMXBean}.
* The unique <tt>ObjectName</tt> for a <tt>GarbageCollectorMXBean</tt>
* can be formed by appending this string with
* "<tt>,name=</tt><i>collector's name</i>".
*/
public final static String GARBAGE_COLLECTOR_MXBEAN_DOMAIN_TYPE =
"java.lang:type=GarbageCollector";
/**
* The domain name and the type key property in
* the <tt>ObjectName</tt> for a {@link MemoryManagerMXBean}.
* The unique <tt>ObjectName</tt> for a <tt>MemoryManagerMXBean</tt>
* can be formed by appending this string with
* "<tt>,name=</tt><i>manager's name</i>".
*/
public final static String MEMORY_MANAGER_MXBEAN_DOMAIN_TYPE=
"java.lang:type=MemoryManager";
/**
* The domain name and the type key property in
* the <tt>ObjectName</tt> for a {@link MemoryPoolMXBean}.
* The unique <tt>ObjectName</tt> for a <tt>MemoryPoolMXBean</tt>
* can be formed by appending this string with
* <tt>,name=</tt><i>pool's name</i>.
*/
public final static String MEMORY_POOL_MXBEAN_DOMAIN_TYPE=
"java.lang:type=MemoryPool";
/**
* Returns the managed bean for the class loading system of
* the Java virtual machine.
*
* @return a {@link ClassLoadingMXBean} object for
* the Java virtual machine.
*/
public static ClassLoadingMXBean getClassLoadingMXBean() {
return ManagementFactoryHelper.getClassLoadingMXBean();
}
/**
* Returns the managed bean for the memory system of
* the Java virtual machine.
*
* @return a {@link MemoryMXBean} object for the Java virtual machine.
*/
public static MemoryMXBean getMemoryMXBean() {
return ManagementFactoryHelper.getMemoryMXBean();
}
/**
* Returns the managed bean for the thread system of
* the Java virtual machine.
*
* @return a {@link ThreadMXBean} object for the Java virtual machine.
*/
public static ThreadMXBean getThreadMXBean() {
return ManagementFactoryHelper.getThreadMXBean();
}
/**
* Returns the managed bean for the runtime system of
* the Java virtual machine.
*
* @return a {@link RuntimeMXBean} object for the Java virtual machine.
*/
public static RuntimeMXBean getRuntimeMXBean() {
return ManagementFactoryHelper.getRuntimeMXBean();
}
/**
* Returns the managed bean for the compilation system of
* the Java virtual machine. This method returns <tt>null</tt>
* if the Java virtual machine has no compilation system.
*
* @return a {@link CompilationMXBean} object for the Java virtual
* machine or <tt>null</tt> if the Java virtual machine has
* no compilation system.
*/
public static CompilationMXBean getCompilationMXBean() {
return ManagementFactoryHelper.getCompilationMXBean();
}
/**
* Returns the managed bean for the operating system on which
* the Java virtual machine is running.
*
* @return an {@link OperatingSystemMXBean} object for
* the Java virtual machine.
*/
public static OperatingSystemMXBean getOperatingSystemMXBean() {
return ManagementFactoryHelper.getOperatingSystemMXBean();
}
/**
* Returns a list of {@link MemoryPoolMXBean} objects in the
* Java virtual machine.
* The Java virtual machine can have one or more memory pools.
* It may add or remove memory pools during execution.
*
* @return a list of <tt>MemoryPoolMXBean</tt> objects.
*
*/
public static List<MemoryPoolMXBean> getMemoryPoolMXBeans() {
return ManagementFactoryHelper.getMemoryPoolMXBeans();
}
/**
* Returns a list of {@link MemoryManagerMXBean} objects
* in the Java virtual machine.
* The Java virtual machine can have one or more memory managers.
* It may add or remove memory managers during execution.
*
* @return a list of <tt>MemoryManagerMXBean</tt> objects.
*
*/
public static List<MemoryManagerMXBean> getMemoryManagerMXBeans() {
return ManagementFactoryHelper.getMemoryManagerMXBeans();
}
/**
* Returns a list of {@link GarbageCollectorMXBean} objects
* in the Java virtual machine.
* The Java virtual machine may have one or more
* <tt>GarbageCollectorMXBean</tt> objects.
* It may add or remove <tt>GarbageCollectorMXBean</tt>
* during execution.
*
* @return a list of <tt>GarbageCollectorMXBean</tt> objects.
*
*/
public static List<GarbageCollectorMXBean> getGarbageCollectorMXBeans() {
return ManagementFactoryHelper.getGarbageCollectorMXBeans();
}
private static MBeanServer platformMBeanServer;
/**
* Returns the platform {@link javax.management.MBeanServer MBeanServer}.
* On the first call to this method, it first creates the platform
* {@code MBeanServer} by calling the
* {@link javax.management.MBeanServerFactory#createMBeanServer
* MBeanServerFactory.createMBeanServer}
* method and registers each platform MXBean in this platform
* {@code MBeanServer} with its
* {@link PlatformManagedObject#getObjectName ObjectName}.
* This method, in subsequent calls, will simply return the
* initially created platform {@code MBeanServer}.
* <p>
* MXBeans that get created and destroyed dynamically, for example,
* memory {@link MemoryPoolMXBean pools} and
* {@link MemoryManagerMXBean managers},
* will automatically be registered and deregistered into the platform
* {@code MBeanServer}.
* <p>
* If the system property {@code javax.management.builder.initial}
* is set, the platform {@code MBeanServer} creation will be done
* by the specified {@link javax.management.MBeanServerBuilder}.
* <p>
* It is recommended that this platform MBeanServer also be used
* to register other application managed beans
* besides the platform MXBeans.
* This will allow all MBeans to be published through the same
* {@code MBeanServer} and hence allow for easier network publishing
* and discovery.
* Name conflicts with the platform MXBeans should be avoided.
*
* @return the platform {@code MBeanServer}; the platform
* MXBeans are registered into the platform {@code MBeanServer}
* at the first time this method is called.
*
* @exception SecurityException if there is a security manager
* and the caller does not have the permission required by
* {@link javax.management.MBeanServerFactory#createMBeanServer}.
*
* @see javax.management.MBeanServerFactory
* @see javax.management.MBeanServerFactory#createMBeanServer
*/
public static synchronized MBeanServer getPlatformMBeanServer() {
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
Permission perm = new MBeanServerPermission("createMBeanServer");
sm.checkPermission(perm);
}
if (platformMBeanServer == null) {
platformMBeanServer = MBeanServerFactory.createMBeanServer();
for (PlatformComponent pc : PlatformComponent.values()) {
List<? extends PlatformManagedObject> list =
pc.getMXBeans(pc.getMXBeanInterface());
for (PlatformManagedObject o : list) {
// Each PlatformComponent represents one management
// interface. Some MXBean may extend another one.
// The MXBean instances for one platform component
// (returned by pc.getMXBeans()) might be also
// the MXBean instances for another platform component.
// e.g. com.sun.management.GarbageCollectorMXBean
//
// So need to check if an MXBean instance is registered
// before registering into the platform MBeanServer
if (!platformMBeanServer.isRegistered(o.getObjectName())) {
addMXBean(platformMBeanServer, o);
}
}
}
HashMap<ObjectName, DynamicMBean> dynmbeans =
ManagementFactoryHelper.getPlatformDynamicMBeans();
for (Map.Entry<ObjectName, DynamicMBean> e : dynmbeans.entrySet()) {
addDynamicMBean(platformMBeanServer, e.getValue(), e.getKey());
}
for (final PlatformManagedObject o :
ExtendedPlatformComponent.getMXBeans()) {
if (!platformMBeanServer.isRegistered(o.getObjectName())) {
addMXBean(platformMBeanServer, o);
}
}
}
return platformMBeanServer;
}
/**
* Returns a proxy for a platform MXBean interface of a
* given <a href="#MXBeanNames">MXBean name</a>
* that forwards its method calls through the given
* <tt>MBeanServerConnection</tt>.
*
* <p>This method is equivalent to:
* <blockquote>
* {@link java.lang.reflect.Proxy#newProxyInstance
* Proxy.newProxyInstance}<tt>(mxbeanInterface.getClassLoader(),
* new Class[] { mxbeanInterface }, handler)</tt>
* </blockquote>
*
* where <tt>handler</tt> is an {@link java.lang.reflect.InvocationHandler
* InvocationHandler} to which method invocations to the MXBean interface
* are dispatched. This <tt>handler</tt> converts an input parameter
* from an MXBean data type to its mapped open type before forwarding
* to the <tt>MBeanServer</tt> and converts a return value from
* an MXBean method call through the <tt>MBeanServer</tt>
* from an open type to the corresponding return type declared in
* the MXBean interface.
*
* <p>
* If the MXBean is a notification emitter (i.e.,
* it implements
* {@link javax.management.NotificationEmitter NotificationEmitter}),
* both the <tt>mxbeanInterface</tt> and <tt>NotificationEmitter</tt>
* will be implemented by this proxy.
*
* <p>
* <b>Notes:</b>
* <ol>
* <li>Using an MXBean proxy is a convenience remote access to
* a platform MXBean of a running virtual machine. All method
* calls to the MXBean proxy are forwarded to an
* <tt>MBeanServerConnection</tt> where
* {@link java.io.IOException IOException} may be thrown
* when the communication problem occurs with the connector server.
* An application remotely accesses the platform MXBeans using
* proxy should prepare to catch <tt>IOException</tt> as if
* accessing with the <tt>MBeanServerConnector</tt> interface.</li>
*
* <li>When a client application is designed to remotely access MXBeans
* for a running virtual machine whose version is different than
* the version on which the application is running,
* it should prepare to catch
* {@link java.io.InvalidObjectException InvalidObjectException}
* which is thrown when an MXBean proxy receives a name of an
* enum constant which is missing in the enum class loaded in
* the client application. </li>
*
* <li>{@link javax.management.MBeanServerInvocationHandler
* MBeanServerInvocationHandler} or its
* {@link javax.management.MBeanServerInvocationHandler#newProxyInstance
* newProxyInstance} method cannot be used to create
* a proxy for a platform MXBean. The proxy object created
* by <tt>MBeanServerInvocationHandler</tt> does not handle
* the properties of the platform MXBeans described in
* the <a href="#MXBean">class specification</a>.
*</li>
* </ol>
*
* @param connection the <tt>MBeanServerConnection</tt> to forward to.
* @param mxbeanName the name of a platform MXBean within
* <tt>connection</tt> to forward to. <tt>mxbeanName</tt> must be
* in the format of {@link ObjectName ObjectName}.
* @param mxbeanInterface the MXBean interface to be implemented
* by the proxy.
* @param <T> an {@code mxbeanInterface} type parameter
*
* @return a proxy for a platform MXBean interface of a
* given <a href="#MXBeanNames">MXBean name</a>
* that forwards its method calls through the given
* <tt>MBeanServerConnection</tt>, or {@code null} if not exist.
*
* @throws IllegalArgumentException if
* <ul>
* <li><tt>mxbeanName</tt> is not with a valid
* {@link ObjectName ObjectName} format, or</li>
* <li>the named MXBean in the <tt>connection</tt> is
* not a MXBean provided by the platform, or</li>
* <li>the named MXBean is not registered in the
* <tt>MBeanServerConnection</tt>, or</li>
* <li>the named MXBean is not an instance of the given
* <tt>mxbeanInterface</tt></li>
* </ul>
*
* @throws java.io.IOException if a communication problem
* occurred when accessing the <tt>MBeanServerConnection</tt>.
*/
public static <T> T
newPlatformMXBeanProxy(MBeanServerConnection connection,
String mxbeanName,
Class<T> mxbeanInterface)
throws java.io.IOException {
// Only allow MXBean interfaces from rt.jar loaded by the
// bootstrap class loader
final Class<?> cls = mxbeanInterface;
ClassLoader loader =
AccessController.doPrivileged(new PrivilegedAction<ClassLoader>() {
public ClassLoader run() {
return cls.getClassLoader();
}
});
if (!sun.misc.VM.isSystemDomainLoader(loader)) {
throw new IllegalArgumentException(mxbeanName +
" is not a platform MXBean");
}
try {
final ObjectName objName = new ObjectName(mxbeanName);
// skip the isInstanceOf check for LoggingMXBean
String intfName = mxbeanInterface.getName();
if (!connection.isInstanceOf(objName, intfName)) {
throw new IllegalArgumentException(mxbeanName +
" is not an instance of " + mxbeanInterface);
}
final Class[] interfaces;
// check if the registered MBean is a notification emitter
boolean emitter = connection.isInstanceOf(objName, NOTIF_EMITTER);
// create an MXBean proxy
return JMX.newMXBeanProxy(connection, objName, mxbeanInterface,
emitter);
} catch (InstanceNotFoundException|MalformedObjectNameException e) {
throw new IllegalArgumentException(e);
}
}
/**
* Returns the platform MXBean implementing
* the given {@code mxbeanInterface} which is specified
* to have one single instance in the Java virtual machine.
* This method may return {@code null} if the management interface
* is not implemented in the Java virtual machine (for example,
* a Java virtual machine with no compilation system does not
* implement {@link CompilationMXBean});
* otherwise, this method is equivalent to calling:
* <pre>
* {@link #getPlatformMXBeans(Class)
* getPlatformMXBeans(mxbeanInterface)}.get(0);
* </pre>
*
* @param mxbeanInterface a management interface for a platform
* MXBean with one single instance in the Java virtual machine
* if implemented.
* @param <T> an {@code mxbeanInterface} type parameter
*
* @return the platform MXBean that implements
* {@code mxbeanInterface}, or {@code null} if not exist.
*
* @throws IllegalArgumentException if {@code mxbeanInterface}
* is not a platform management interface or
* not a singleton platform MXBean.
*
* @since 1.7
*/
public static <T extends PlatformManagedObject>
T getPlatformMXBean(Class<T> mxbeanInterface) {
PlatformComponent pc = PlatformComponent.getPlatformComponent(mxbeanInterface);
if (pc == null) {
T mbean = ExtendedPlatformComponent.getMXBean(mxbeanInterface);
if (mbean != null) {
return mbean;
}
throw new IllegalArgumentException(mxbeanInterface.getName() +
" is not a platform management interface");
}
if (!pc.isSingleton())
throw new IllegalArgumentException(mxbeanInterface.getName() +
" can have zero or more than one instances");
return pc.getSingletonMXBean(mxbeanInterface);
}
/**
* Returns the list of platform MXBeans implementing
* the given {@code mxbeanInterface} in the Java
* virtual machine.
* The returned list may contain zero, one, or more instances.
* The number of instances in the returned list is defined
* in the specification of the given management interface.
* The order is undefined and there is no guarantee that
* the list returned is in the same order as previous invocations.
*
* @param mxbeanInterface a management interface for a platform
* MXBean
* @param <T> an {@code mxbeanInterface} type parameter
*
* @return the list of platform MXBeans that implement
* {@code mxbeanInterface}.
*
* @throws IllegalArgumentException if {@code mxbeanInterface}
* is not a platform management interface.
*
* @since 1.7
*/
public static <T extends PlatformManagedObject> List<T>
getPlatformMXBeans(Class<T> mxbeanInterface) {
PlatformComponent pc = PlatformComponent.getPlatformComponent(mxbeanInterface);
if (pc == null) {
T mbean = ExtendedPlatformComponent.getMXBean(mxbeanInterface);
if (mbean != null) {
return Collections.singletonList(mbean);
}
throw new IllegalArgumentException(mxbeanInterface.getName() +
" is not a platform management interface");
}
return Collections.unmodifiableList(pc.getMXBeans(mxbeanInterface));
}
/**
* Returns the platform MXBean proxy for
* {@code mxbeanInterface} which is specified to have one single
* instance in a Java virtual machine and the proxy will
* forward the method calls through the given {@code MBeanServerConnection}.
* This method may return {@code null} if the management interface
* is not implemented in the Java virtual machine being monitored
* (for example, a Java virtual machine with no compilation system
* does not implement {@link CompilationMXBean});
* otherwise, this method is equivalent to calling:
* <pre>
* {@link #getPlatformMXBeans(MBeanServerConnection, Class)
* getPlatformMXBeans(connection, mxbeanInterface)}.get(0);
* </pre>
*
* @param connection the {@code MBeanServerConnection} to forward to.
* @param mxbeanInterface a management interface for a platform
* MXBean with one single instance in the Java virtual machine
* being monitored, if implemented.
* @param <T> an {@code mxbeanInterface} type parameter
*
* @return the platform MXBean proxy for
* forwarding the method calls of the {@code mxbeanInterface}
* through the given {@code MBeanServerConnection},
* or {@code null} if not exist.
*
* @throws IllegalArgumentException if {@code mxbeanInterface}
* is not a platform management interface or
* not a singleton platform MXBean.
* @throws java.io.IOException if a communication problem
* occurred when accessing the {@code MBeanServerConnection}.
*
* @see #newPlatformMXBeanProxy
* @since 1.7
*/
public static <T extends PlatformManagedObject>
T getPlatformMXBean(MBeanServerConnection connection,
Class<T> mxbeanInterface)
throws java.io.IOException
{
PlatformComponent pc = PlatformComponent.getPlatformComponent(mxbeanInterface);
if (pc == null) {
T mbean = ExtendedPlatformComponent.getMXBean(mxbeanInterface);
if (mbean != null) {
ObjectName on = mbean.getObjectName();
return ManagementFactory.newPlatformMXBeanProxy(connection,
on.getCanonicalName(),
mxbeanInterface);
}
throw new IllegalArgumentException(mxbeanInterface.getName() +
" is not a platform management interface");
}
if (!pc.isSingleton())
throw new IllegalArgumentException(mxbeanInterface.getName() +
" can have zero or more than one instances");
return pc.getSingletonMXBean(connection, mxbeanInterface);
}
/**
* Returns the list of the platform MXBean proxies for
* forwarding the method calls of the {@code mxbeanInterface}
* through the given {@code MBeanServerConnection}.
* The returned list may contain zero, one, or more instances.
* The number of instances in the returned list is defined
* in the specification of the given management interface.
* The order is undefined and there is no guarantee that
* the list returned is in the same order as previous invocations.
*
* @param connection the {@code MBeanServerConnection} to forward to.
* @param mxbeanInterface a management interface for a platform
* MXBean
* @param <T> an {@code mxbeanInterface} type parameter
*
* @return the list of platform MXBean proxies for
* forwarding the method calls of the {@code mxbeanInterface}
* through the given {@code MBeanServerConnection}.
*
* @throws IllegalArgumentException if {@code mxbeanInterface}
* is not a platform management interface.
*
* @throws java.io.IOException if a communication problem
* occurred when accessing the {@code MBeanServerConnection}.
*
* @see #newPlatformMXBeanProxy
* @since 1.7
*/
public static <T extends PlatformManagedObject>
List<T> getPlatformMXBeans(MBeanServerConnection connection,
Class<T> mxbeanInterface)
throws java.io.IOException
{
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