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Diffstat (limited to 'libjava/classpath/java/lang/management/ManagementFactory.java')
| -rw-r--r-- | libjava/classpath/java/lang/management/ManagementFactory.java | 331 |
1 files changed, 331 insertions, 0 deletions
diff --git a/libjava/classpath/java/lang/management/ManagementFactory.java b/libjava/classpath/java/lang/management/ManagementFactory.java new file mode 100644 index 00000000000..6e7af0f274e --- /dev/null +++ b/libjava/classpath/java/lang/management/ManagementFactory.java @@ -0,0 +1,331 @@ +/* ManagementFactory.java - Factory for obtaining system beans. + Copyright (C) 2006 Free Software Foundation + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath 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 for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + +package java.lang.management; + +import gnu.classpath.SystemProperties; + +import gnu.java.lang.management.ClassLoadingMXBeanImpl; +import gnu.java.lang.management.CompilationMXBeanImpl; +import gnu.java.lang.management.GarbageCollectorMXBeanImpl; +import gnu.java.lang.management.OperatingSystemMXBeanImpl; +import gnu.java.lang.management.MemoryMXBeanImpl; +import gnu.java.lang.management.MemoryManagerMXBeanImpl; +import gnu.java.lang.management.MemoryPoolMXBeanImpl; +import gnu.java.lang.management.RuntimeMXBeanImpl; +import gnu.java.lang.management.ThreadMXBeanImpl; + +import java.util.ArrayList; +import java.util.List; + +import javax.management.NotCompliantMBeanException; + +/** + * <p> + * Provides access to the system's management beans via a series + * of static methods. + * </p> + * <p> + * An instance of a system management bean can be obtained by + * using one of the following methods: + * </p> + * <ol> + * <li>Calling the appropriate static method of this factory. + * </li> + * </ol> + * + * @author Andrew John Hughes (gnu_andrew@member.fsf.org) + * @since 1.5 + */ +public class ManagementFactory +{ + + /** + * The operating system management bean. + */ + private static OperatingSystemMXBean osBean; + + /** + * The runtime management bean. + */ + private static RuntimeMXBean runtimeBean; + + /** + * The class loading management bean. + */ + private static ClassLoadingMXBean classLoadingBean; + + /** + * The thread bean. + */ + private static ThreadMXBean threadBean; + + /** + * The memory bean. + */ + private static MemoryMXBean memoryBean; + + /** + * The compilation bean (may remain null). + */ + private static CompilationMXBean compilationBean; + + /** + * Private constructor to prevent instance creation. + */ + private ManagementFactory() {} + + /** + * Returns the operating system management bean for the + * operating system on which the virtual machine is running. + * + * @return an instance of {@link OperatingSystemMXBean} for + * the underlying operating system. + */ + public static OperatingSystemMXBean getOperatingSystemMXBean() + { + if (osBean == null) + try + { + osBean = new OperatingSystemMXBeanImpl(); + } + catch (NotCompliantMBeanException e) + { + throw new InternalError("The GNU implementation of the " + + "operating system bean is not a " + + "compliant management bean."); + } + return osBean; + } + + /** + * Returns the runtime management bean for the + * running virtual machine. + * + * @return an instance of {@link RuntimeMXBean} for + * this virtual machine. + */ + public static RuntimeMXBean getRuntimeMXBean() + { + if (runtimeBean == null) + try + { + runtimeBean = new RuntimeMXBeanImpl(); + } + catch (NotCompliantMBeanException e) + { + throw new InternalError("The GNU implementation of the " + + "runtime bean is not a compliant " + + "management bean."); + } + return runtimeBean; + } + + /** + * Returns the class loading management bean for the + * running virtual machine. + * + * @return an instance of {@link ClassLoadingMXBean} for + * this virtual machine. + */ + public static ClassLoadingMXBean getClassLoadingMXBean() + { + if (classLoadingBean == null) + try + { + classLoadingBean = new ClassLoadingMXBeanImpl(); + } + catch (NotCompliantMBeanException e) + { + throw new InternalError("The GNU implementation of the " + + "class loading bean is not a " + + "compliant management bean."); + } + return classLoadingBean; + } + + /** + * Returns the thread management bean for the running + * virtual machine. + * + * @return an instance of {@link ThreadMXBean} for + * this virtual machine. + */ + public static ThreadMXBean getThreadMXBean() + { + if (threadBean == null) + try + { + threadBean = new ThreadMXBeanImpl(); + } + catch (NotCompliantMBeanException e) + { + throw new InternalError("The GNU implementation of the " + + "thread bean is not a compliant " + + "management bean."); + } + return threadBean; + } + + /** + * Returns the memory management bean for the running + * virtual machine. + * + * @return an instance of {@link MemoryMXBean} for + * this virtual machine. + */ + public static MemoryMXBean getMemoryMXBean() + { + if (memoryBean == null) + try + { + memoryBean = new MemoryMXBeanImpl(); + } + catch (NotCompliantMBeanException e) + { + throw new InternalError("The GNU implementation of the " + + "memory bean is not a compliant " + + "management bean."); + } + return memoryBean; + } + + /** + * Returns the compilation bean for the running + * virtual machine, if supported. Otherwise, + * it returns <code>null</code>. + * + * @return an instance of {@link CompilationMXBean} for + * this virtual machine, or <code>null</code> + * if the virtual machine doesn't include + * a Just-In-Time (JIT) compiler. + */ + public static CompilationMXBean getCompilationMXBean() + { + if (compilationBean == null && + SystemProperties.getProperty("gnu.java.compiler.name") != null) + try + { + compilationBean = new CompilationMXBeanImpl(); + } + catch (NotCompliantMBeanException e) + { + throw new InternalError("The GNU implementation of the " + + "compilation bean is not a compliant " + + "management bean."); + } + return compilationBean; + } + + /** + * Returns the memory pool beans for the running + * virtual machine. These may change during the course + * of execution. + * + * @return a list of memory pool beans, one for each pool. + */ + public static List getMemoryPoolMXBeans() + { + List poolBeans = new ArrayList(); + String[] names = VMManagementFactory.getMemoryPoolNames(); + for (int a = 0; a < names.length; ++a) + try + { + poolBeans.add(new MemoryPoolMXBeanImpl(names[a])); + } + catch (NotCompliantMBeanException e) + { + throw new InternalError("The GNU implementation of the " + + "memory pool bean, " + a + ", is " + + "not a compliant management bean."); + } + return poolBeans; + } + + /** + * Returns the memory manager beans for the running + * virtual machine. These may change during the course + * of execution. + * + * @return a list of memory manager beans, one for each manager. + */ + public static List getMemoryManagerMXBeans() + { + List managerBeans = new ArrayList(); + String[] names = VMManagementFactory.getMemoryManagerNames(); + for (int a = 0; a < names.length; ++a) + try + { + managerBeans.add(new MemoryManagerMXBeanImpl(names[a])); + } + catch (NotCompliantMBeanException e) + { + throw new InternalError("The GNU implementation of the " + + "memory manager bean, " + a + ", is " + + "not a compliant management bean."); + } + managerBeans.addAll(getGarbageCollectorMXBeans()); + return managerBeans; + } + + /** + * Returns the garbage collector beans for the running + * virtual machine. These may change during the course + * of execution. + * + * @return a list of garbage collector beans, one for each pool. + */ + public static List getGarbageCollectorMXBeans() + { + List gcBeans = new ArrayList(); + String[] names = VMManagementFactory.getGarbageCollectorNames(); + for (int a = 0; a < names.length; ++a) + try + { + gcBeans.add(new GarbageCollectorMXBeanImpl(names[a])); + } + catch (NotCompliantMBeanException e) + { + throw new InternalError("The GNU implementation of the " + + "garbage collector bean, " + a + + ", is not a compliant management " + + "bean."); + } + return gcBeans; + } + +} |
