Java tutorial
/* * Copyright (c) 2003, 2008, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package java.lang.management; /** * 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. * * @return the total number of classes loaded. * */ public long getTotalLoadedClassCount(); /** * 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. * * @return the total number of unloaded classes. */ public long getUnloadedClassCount(); /** * 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. * * <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); }