/*
* @(#)ManagementFactory.java 1.19 04/05/17
*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package java.lang.management;
import javax.management.NotificationEmitter;
import javax.management.MBeanServer;
import javax.management.MBeanServerFactory;
import javax.management.MBeanServerConnection;
import javax.management.MBeanServerPermission;
import javax.management.ObjectName;
import javax.management.InstanceNotFoundException;
import javax.management.MalformedObjectNameException;
import javax.management.openmbean.CompositeData;
import javax.management.openmbean.CompositeType;
import javax.management.openmbean.TabularData;
import java.util.List;
import java.lang.reflect.Proxy;
import java.lang.reflect.InvocationHandler;
import java.security.AccessController;
import java.security.Permission;
import java.security.PrivilegedAction;
import sun.management.PlatformMXBeanInvocationHandler;
/**
* The 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 platform MXBean(s) representing
* the management interface of a component of the Java virtual
* machine.
*
*
* An application can access a platform MXBean in the following ways:
*
* - Direct access to an MXBean interface
*
* - Get the MXBean instance through the static factory method
* and access the MXBean locally of the running
* virtual machine.
*
* - Construct an MXBean proxy instance that forwards the
* method calls to a given {@link MBeanServer MBeanServer} by calling
* {@link #newPlatformMXBeanProxy newPlatfromMXBeanProxy}.
* A proxy is typically constructed to remotely access
* an MXBean of another running virtual machine.
*
*
* - Indirect access to an MXBean interface via MBeanServer
*
* - Go through the {@link #getPlatformMBeanServer
* platform MBeanServer} to access MXBeans locally or
* a specific MBeanServerConnection to access
* MXBeans remotely.
* The attributes and operations of an MXBean use only
* JMX open types which include basic
* data types, {@link CompositeData CompositeData},
* and {@link TabularData TabularData} defined in
* {@link javax.management.openmbean.OpenType OpenType}.
* The mapping is specified below.
*
*
*
*
*
* A platform MXBean is a managed bean that conforms to
* the JMX Instrumentation Specification and only uses
* a set of basic data types described below.
* A JMX management application and the 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
* {@link javax.management.openmbean.OpenType open types}
* and this allows interoperation across versions.
*
* The platform MXBean interfaces use only the following data types:
*
* - Primitive types such as int, long,
* boolean, etc
* - Wrapper classes for primitive types such as
* {@link java.lang.Integer Integer}, {@link java.lang.Long Long},
* {@link java.lang.Boolean Boolean}, etc and
* {@link java.lang.String String}
* - {@link java.lang.Enum Enum} classes
* - Classes that define only getter methods and define a static
* from method with a {@link CompositeData CompositeData}
* argument to convert from an input CompositeData to
* an instance of that class
*
* - {@link java.util.List List<E>}
* where E is a primitive type, a wrapper class,
* an enum class, or a class supporting conversion from a
* CompositeData to its class
*
* - {@link java.util.Map Map<K,V>}
* where K and V are
* a primitive type, a wrapper class,
* an enum class, or a class supporting conversion from a
* CompositeData to its class
*
*
*
*
* When an attribute or operation of a platform MXBean
* is accessed via an MBeanServer, the data types are mapped
* as follows:
*
* - A primitive type or a wrapper class is mapped
* to the same type.
*
* - An {@link Enum} is mapped to
* String whose value is the name of the enum constant.
*
- A class that defines only getter methods and a static
* from method with a {@link CompositeData CompositeData}
* argument is mapped to
* {@link javax.management.openmbean.CompositeData CompositeData}.
*
* - Map<K,V> is mapped to
* {@link TabularData TabularData}
* whose row type is a {@link CompositeType CompositeType} with
* two items whose names are "key" and "value"
* and the item types are
* the corresponding mapped type of K and V
* respectively and the "key" is the index.
*
* - List<E> is mapped to an array with the mapped
* type of E as the element type.
*
* - An array of element type E is mapped to
* an array of the same dimenions with the mapped type of E
* as the element type.
*
*
* The {@link javax.management.MBeanInfo MBeanInfo}
* for a platform MXBean
* describes the data types of the attributes and operations
* as primitive or open types mapped as specified above.
*
*
* For example, the {@link MemoryMXBean}
* interface has the following getter and setter methods:
*
*
* public MemoryUsage getHeapMemoryUsage();
* public boolean isVerbose();
* public void setVerbose(boolean value);
*
*
* These attributes in the MBeanInfo
* of the MemoryMXBean have the following names and types:
*
*
*
*
* | Attribute Name |
* Type |
*
*
* | HeapMemoryUsage |
* {@link MemoryUsage#from
* CompositeData representing MemoryUsage} |
*
*
* | Verbose |
* boolean |
*
*
*
*
*
* Implementation Note:
* The mapping specified above could be done in the implementation
* of each platform MXBean. One good implementation choice is to
* implement a MXBean as a {@link javax.management.DynamicMBean dynamic
* MBean}.
*
*
*
* Each platform MXBean for a Java virtual machine has a unique
* {@link javax.management.ObjectName ObjectName} for
* registration in the platform MBeanServer.
* A Java virtual machine has a single instance of the following management
* interfaces:
*
*
*
*
* | Management Interface |
* ObjectName |
*
*
* | {@link ClassLoadingMXBean} |
* {@link #CLASS_LOADING_MXBEAN_NAME
* java.lang:type=ClassLoading} |
*
*
* | {@link MemoryMXBean} |
* {@link #MEMORY_MXBEAN_NAME
* java.lang:type=Memory} |
*
*
* | {@link ThreadMXBean} |
* {@link #THREAD_MXBEAN_NAME
* java.lang:type=Threading} |
*
*
* | {@link RuntimeMXBean} |
* {@link #RUNTIME_MXBEAN_NAME
* java.lang:type=Runtime} |
*
*
* | {@link OperatingSystemMXBean} |
* {@link #OPERATING_SYSTEM_MXBEAN_NAME
* java.lang:type=OperatingSystem} |
*
*
*
*
*
* A Java virtual machine has zero or a single instance of
* the following management interfaces.
*
*
*
*
* | Management Interface |
* ObjectName |
*
*
* | {@link CompilationMXBean} |
* {@link #COMPILATION_MXBEAN_NAME
* java.lang:type=Compilation} |
*
*
*
*
*
* A Java virtual machine may have one or more instances of the following
* management interfaces.
*
*
*
* | Management Interface |
* ObjectName |
*
*
* | {@link GarbageCollectorMXBean} |
* {@link #GARBAGE_COLLECTOR_MXBEAN_DOMAIN_TYPE
* java.lang:type=GarbageCollector},name=collector's name |
*
*
* | {@link MemoryManagerMXBean} |
* {@link #MEMORY_MANAGER_MXBEAN_DOMAIN_TYPE
* java.lang:type=MemoryManager},name=manager's name |
*
*
* | {@link MemoryPoolMXBean} |
* {@link #MEMORY_POOL_MXBEAN_DOMAIN_TYPE
* java.lang:type=MemoryPool},name=pool's name |
*
*
*
*
* @see
* JMX Specification.
* @see
* Ways to Access Management Metrics
* @see java.util.logging.LoggingMXBean
*
* @author Mandy Chung
* @version 1.19, 05/17/04
* @since 1.5
*/
public class ManagementFactory {
// A class with only static fields and methods.
private ManagementFactory() {};
/**
* String representation of the
* ObjectName for the {@link ClassLoadingMXBean}.
*/
public final static String CLASS_LOADING_MXBEAN_NAME =
"java.lang:type=ClassLoading";
/**
* String representation of the
* ObjectName for the {@link CompilationMXBean}.
*/
public final static String COMPILATION_MXBEAN_NAME =
"java.lang:type=Compilation";
/**
* String representation of the
* ObjectName for the {@link MemoryMXBean}.
*/
public final static String MEMORY_MXBEAN_NAME =
"java.lang:type=Memory";
/**
* String representation of the
* ObjectName for the {@link OperatingSystemMXBean}.
*/
public final static String OPERATING_SYSTEM_MXBEAN_NAME =
"java.lang:type=OperatingSystem";
/**
* String representation of the
* ObjectName for the {@link RuntimeMXBean}.
*/
public final static String RUNTIME_MXBEAN_NAME =
"java.lang:type=Runtime";
/**
* String representation of the
* ObjectName 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 ObjectName for a {@link GarbageCollectorMXBean}.
* The unique ObjectName for a GarbageCollectorMXBean
* can be formed by appending this string with
* ",name=collector's name".
*/
public final static String GARBAGE_COLLECTOR_MXBEAN_DOMAIN_TYPE =
"java.lang:type=GarbageCollector";
/**
* The domain name and the type key property in
* the ObjectName for a {@link MemoryManagerMXBean}.
* The unique ObjectName for a MemoryManagerMXBean
* can be formed by appending this string with
* ",name=manager's name".
*/
public final static String MEMORY_MANAGER_MXBEAN_DOMAIN_TYPE=
"java.lang:type=MemoryManager";
/**
* The domain name and the type key property in
* the ObjectName for a {@link MemoryPoolMXBean}.
* The unique ObjectName for a MemoryPoolMXBean
* can be formed by appending this string with
* ,name=pool's name.
*/
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 sun.management.ManagementFactory.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 sun.management.ManagementFactory.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 sun.management.ManagementFactory.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 sun.management.ManagementFactory.getRuntimeMXBean();
}
/**
* Returns the managed bean for the compilation system of
* the Java virtual machine. This method returns null
* if the Java virtual machine has no compilation system.
*
* @return a {@link CompilationMXBean} object for the Java virtual
* machine or null if the Java virtual machine has
* no compilation system.
*/
public static CompilationMXBean getCompilationMXBean() {
return sun.management.ManagementFactory.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 sun.management.ManagementFactory.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 MemoryPoolMXBean objects.
*
*/
public static List getMemoryPoolMXBeans() {
return sun.management.ManagementFactory.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 MemoryManagerMXBean objects.
*
*/
public static List getMemoryManagerMXBeans() {
return sun.management.ManagementFactory.getMemoryManagerMXBeans();
}
/**
* Returns a list of {@link GarbageCollectorMXBean} objects
* in the Java virtual machine.
* The Java virtual machine may have one or more
* GarbageCollectorMXBean objects.
* It may add or remove GarbageCollectorMXBean
* during execution.
*
* @return a list of GarbageCollectorMXBean objects.
*
*/
public static List getGarbageCollectorMXBeans() {
return sun.management.ManagementFactory.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
* MBeanServer by calling the
* {@link MBeanServerFactory#createMBeanServer}
* method and registers the platform MXBeans in this platform
* MBeanServer using the MXBean names
* defined in the class description.
* This method, in subsequent calls, will simply return the
* initially created platform MBeanServer.
*
* 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
* MBeanServer.
*
* If the system property javax.management.builder.initial
* is set, the platform MBeanServer creation will be done
* by the specified {@link javax.management.MBeanServerBuilder}.
*
* 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
* MBeanServer and hence allow for easier network publishing
* and discovery.
* Name conflicts with the platform MXBeans should be avoided.
*
* @return the platform MBeanServer; the platform
* MXBeans are registered into the platform 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 =
sun.management.ManagementFactory.createPlatformMBeanServer();
}
return platformMBeanServer;
}
/**
* Returns a proxy for a platform MXBean interface of a
* given MXBean name
* that forwards its method calls through the given
* MBeanServerConnection.
*
*
This method is equivalent to:
*
* {@link java.lang.reflect.Proxy#newProxyInstance
* Proxy.newProxyInstance}(mxbeanInterface.getClassLoader(),
* new Class[] { mxbeanInterface }, handler)
*
*
* where handler is an {@link java.lang.reflect.InvocationHandler
* InvocationHandler} to which method invocations to the MXBean interface
* are dispatched. This handler converts an input parameter
* from an MXBean data type to its mapped open type before forwarding
* to the MBeanServer and converts a return value from
* an MXBean method call through the MBeanServer
* from an open type to the corresponding return type declared in
* the MXBean interface.
*
*
* If the MXBean is a notification emitter (i.e.,
* it implements {@link NotificationEmitter NotificationEmitter}),
* both the mxbeanInterface and NotificationEmitter
* will be implemented by this proxy.
*
*
* Notes:
*
* - 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
* MBeanServerConnection 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 IOException as if
* accessing with the MBeanServerConnector interface.
*
* - 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.
*
* - {@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 MBeanServerInvocationHandler does not handle
* the properties of the platform MXBeans described in
* the class specification.
*
*
*
* @param connection the MBeanServerConnection to forward to.
* @param mxbeanName the name of a platform MXBean within
* connection to forward to. mxbeanName must be
* in the format of {@link ObjectName ObjectName}.
* @param mxbeanInterface the MXBean interface to be implemented
* by the proxy.
*
* @throws IllegalArgumentException if
*
* - mxbeanName is not with a valid
* {@link ObjectName ObjectName} format, or
* - the named MXBean in the connection is
* not a MXBean provided by the platform, or
* - the named MXBean is not registered in the
* MBeanServerConnection, or
* - the named MXBean is not an instance of the given
* mxbeanInterface
*
*
* @throws java.io.IOException if a communication problem
* occurred when accessing the MBeanServerConnection.
*/
public static T
newPlatformMXBeanProxy(MBeanServerConnection connection,
String mxbeanName,
Class mxbeanInterface)
throws java.io.IOException {
final Class interfaceClass = mxbeanInterface;
// Only allow MXBean interfaces from rt.jar loaded by the
// bootstrap class loader
final ClassLoader loader = (ClassLoader)
AccessController.doPrivileged(new PrivilegedAction() {
public Object run() {
return interfaceClass.getClassLoader();
}
});
if (loader != null) {
throw new IllegalArgumentException(mxbeanName +
" is not a platform MXBean");
}
try {
final ObjectName objName = new ObjectName(mxbeanName);
if (!connection.isInstanceOf(objName, interfaceClass.getName())) {
throw new IllegalArgumentException(mxbeanName +
" is not an instance of " + interfaceClass);
}
final Class[] interfaces;
// check if the registered MBean is a notification emitter
if (connection.isInstanceOf(objName,
NOTIF_EMITTER)) {
interfaces = new Class[] {
interfaceClass,
NotificationEmitter.class
};
} else {
interfaces = new Class[] {interfaceClass};
}
// create a MXBean proxy
InvocationHandler handler =
new PlatformMXBeanInvocationHandler(connection,
objName,
interfaceClass);
return (T) Proxy.newProxyInstance(interfaceClass.getClassLoader(),
interfaces,
handler);
} catch (InstanceNotFoundException e) {
final IllegalArgumentException iae =
new IllegalArgumentException(mxbeanName +
" not found in the connection.");
iae.initCause(e);
throw iae;
} catch (MalformedObjectNameException e) {
final IllegalArgumentException iae =
new IllegalArgumentException(mxbeanName +
" is not a valid ObjectName format.");
iae.initCause(e);
throw iae;
}
}
private static final String NOTIF_EMITTER =
"javax.management.NotificationEmitter";
}