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package java.lang.management;
The management interface for the class loading system of
the Java virtual machine.
A Java virtual machine has a single instance of the implementation
class of this interface. This instance implementing this interface is
an MXBean that can be obtained by calling the ManagementFactory.getClassLoadingMXBean method or from the
platform MBeanServer.
The ObjectName for uniquely identifying the MXBean for the class loading system within an MBeanServer is:
java.lang:type=ClassLoading
It can be obtained by calling the PlatformManagedObject.getObjectName method. Author: Mandy Chung See Also: Since: 1.5
/**
* The management interface for the class loading system of
* the Java virtual machine.
*
* <p> A Java virtual machine has a single instance of the implementation
* class of this interface. This instance implementing this interface is
* an <a href="ManagementFactory.html#MXBean">MXBean</a>
* that can be obtained by calling
* the {@link ManagementFactory#getClassLoadingMXBean} method or
* from the {@link ManagementFactory#getPlatformMBeanServer
* platform MBeanServer}.
*
* <p>The {@code ObjectName} for uniquely identifying the MXBean for
* the class loading system within an {@code MBeanServer} is:
* <blockquote>
* {@link ManagementFactory#CLASS_LOADING_MXBEAN_NAME
* java.lang:type=ClassLoading}
* </blockquote>
*
* It can be obtained by calling the
* {@link PlatformManagedObject#getObjectName} method.
*
* @see ManagementFactory#getPlatformMXBeans(Class)
* @see <a href="../../../javax/management/package-summary.html">
* JMX Specification.</a>
* @see <a href="package-summary.html#examples">
* Ways to Access MXBeans</a>
*
* @author Mandy Chung
* @since 1.5
*/
public interface ClassLoadingMXBean extends PlatformManagedObject {
Returns the total number of classes that have been loaded since
the Java virtual machine has started execution.
Returns: the total number of classes loaded.
/**
* Returns the total number of classes that have been loaded since
* the Java virtual machine has started execution.
*
* @return the total number of classes loaded.
*
*/
public long getTotalLoadedClassCount();
Returns the number of classes that are currently loaded in the
Java virtual machine.
Returns: the number of currently loaded classes.
/**
* Returns the number of classes that are currently loaded in the
* Java virtual machine.
*
* @return the number of currently loaded classes.
*/
public int getLoadedClassCount();
Returns the total number of classes unloaded since the Java virtual machine
has started execution.
Returns: the total number of unloaded classes.
/**
* Returns the total number of classes unloaded since the Java virtual machine
* has started execution.
*
* @return the total number of unloaded classes.
*/
public long getUnloadedClassCount();
Tests if the verbose output for the class loading system is enabled.
Returns: true if the verbose output for the class loading system is enabled; false otherwise.
/**
* Tests if the verbose output for the class loading system is enabled.
*
* @return {@code true} if the verbose output for the class loading
* system is enabled; {@code false} otherwise.
*/
public boolean isVerbose();
Enables or disables the verbose output for the class loading
system. The verbose output information and the output stream
to which the verbose information is emitted are implementation
dependent. Typically, a Java virtual machine implementation
prints a message each time a class file is loaded.
This method can be called by multiple threads concurrently.
Each invocation of this method enables or disables the verbose
output globally.
Params: - value –
true to enable the verbose output; false to disable.
Throws: - SecurityException – if a security manager
exists and the caller does not have
ManagementPermission("control").
/**
* Enables or disables the verbose output for the class loading
* system. The verbose output information and the output stream
* to which the verbose information is emitted are implementation
* dependent. Typically, a Java virtual machine implementation
* prints a message each time a class file is loaded.
*
* <p>This method can be called by multiple threads concurrently.
* Each invocation of this method enables or disables the verbose
* output globally.
*
* @param value {@code true} to enable the verbose output;
* {@code false} to disable.
*
* @exception java.lang.SecurityException if a security manager
* exists and the caller does not have
* ManagementPermission("control").
*/
public void setVerbose(boolean value);
}