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| 1 | /* | ||
| 2 | * Copyright (c) 2003, 2008, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package java.lang.management; | ||
| 27 | |||
| 28 | /** | ||
| 29 | * The management interface for the class loading system of | ||
| 30 | * the Java virtual machine. | ||
| 31 | * | ||
| 32 | * <p> A Java virtual machine has a single instance of the implementation | ||
| 33 | * class of this interface. This instance implementing this interface is | ||
| 34 | * an <a href="ManagementFactory.html#MXBean">MXBean</a> | ||
| 35 | * that can be obtained by calling | ||
| 36 | * the {@link ManagementFactory#getClassLoadingMXBean} method or | ||
| 37 | * from the {@link ManagementFactory#getPlatformMBeanServer | ||
| 38 | * platform <tt>MBeanServer</tt>}. | ||
| 39 | * | ||
| 40 | * <p>The <tt>ObjectName</tt> for uniquely identifying the MXBean for | ||
| 41 | * the class loading system within an <tt>MBeanServer</tt> is: | ||
| 42 | * <blockquote> | ||
| 43 | * {@link ManagementFactory#CLASS_LOADING_MXBEAN_NAME | ||
| 44 | * <tt>java.lang:type=ClassLoading</tt>} | ||
| 45 | * </blockquote> | ||
| 46 | * | ||
| 47 | * It can be obtained by calling the | ||
| 48 | * {@link PlatformManagedObject#getObjectName} method. | ||
| 49 | * | ||
| 50 | * @see ManagementFactory#getPlatformMXBeans(Class) | ||
| 51 | * @see <a href="../../../javax/management/package-summary.html"> | ||
| 52 | * JMX Specification.</a> | ||
| 53 | * @see <a href="package-summary.html#examples"> | ||
| 54 | * Ways to Access MXBeans</a> | ||
| 55 | * | ||
| 56 | * @author Mandy Chung | ||
| 57 | * @since 1.5 | ||
| 58 | */ | ||
| 59 | public interface ClassLoadingMXBean extends PlatformManagedObject { | ||
| 60 | |||
| 61 | /** | ||
| 62 | * Returns the total number of classes that have been loaded since | ||
| 63 | * the Java virtual machine has started execution. | ||
| 64 | * | ||
| 65 | * @return the total number of classes loaded. | ||
| 66 | * | ||
| 67 | */ | ||
| 68 | public long getTotalLoadedClassCount(); | ||
| 69 | |||
| 70 | /** | ||
| 71 | * Returns the number of classes that are currently loaded in the | ||
| 72 | * Java virtual machine. | ||
| 73 | * | ||
| 74 | * @return the number of currently loaded classes. | ||
| 75 | */ | ||
| 76 | public int getLoadedClassCount(); | ||
| 77 | |||
| 78 | /** | ||
| 79 | * Returns the total number of classes unloaded since the Java virtual machine | ||
| 80 | * has started execution. | ||
| 81 | * | ||
| 82 | * @return the total number of unloaded classes. | ||
| 83 | */ | ||
| 84 | public long getUnloadedClassCount(); | ||
| 85 | |||
| 86 | /** | ||
| 87 | * Tests if the verbose output for the class loading system is enabled. | ||
| 88 | * | ||
| 89 | * @return <tt>true</tt> if the verbose output for the class loading | ||
| 90 | * system is enabled; <tt>false</tt> otherwise. | ||
| 91 | */ | ||
| 92 | public boolean isVerbose(); | ||
| 93 | |||
| 94 | /** | ||
| 95 | * Enables or disables the verbose output for the class loading | ||
| 96 | * system. The verbose output information and the output stream | ||
| 97 | * to which the verbose information is emitted are implementation | ||
| 98 | * dependent. Typically, a Java virtual machine implementation | ||
| 99 | * prints a message each time a class file is loaded. | ||
| 100 | * | ||
| 101 | * <p>This method can be called by multiple threads concurrently. | ||
| 102 | * Each invocation of this method enables or disables the verbose | ||
| 103 | * output globally. | ||
| 104 | * | ||
| 105 | * @param value <tt>true</tt> to enable the verbose output; | ||
| 106 | * <tt>false</tt> to disable. | ||
| 107 | * | ||
| 108 | * @exception java.lang.SecurityException if a security manager | ||
| 109 | * exists and the caller does not have | ||
| 110 | * ManagementPermission("control"). | ||
| 111 | */ | ||
| 112 | public void setVerbose(boolean value); | ||
| 113 | |||
| 114 | } | ||