/*

 * 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

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 */

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);

}