| /* ThreadMXBeanImpl.java - Implementation of a thread bean |
| 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 gnu.java.lang.management; |
| |
| import gnu.classpath.SystemProperties; |
| |
| import java.lang.management.ThreadInfo; |
| import java.lang.management.ThreadMXBean; |
| |
| import javax.management.NotCompliantMBeanException; |
| |
| /** |
| * Provides access to information about the threads |
| * of the virtual machine. An instance of this bean is |
| * obtained by calling |
| * {@link ManagementFactory#getThreadMXBean()}. |
| * See {@link java.lang.management.ThreadMXBean} for |
| * full documentation. |
| * |
| * @author Andrew John Hughes (gnu_andrew@member.fsf.org) |
| * @since 1.5 |
| */ |
| public final class ThreadMXBeanImpl |
| extends BeanImpl |
| implements ThreadMXBean |
| { |
| |
| /** |
| * Constant for current thread time support. |
| */ |
| private static final String CURRENT_THREAD_TIME_SUPPORT = |
| "gnu.java.lang.management.CurrentThreadTimeSupport"; |
| |
| /** |
| * Constant for thread time support. |
| */ |
| private static final String THREAD_TIME_SUPPORT = |
| "gnu.java.lang.management.ThreadTimeSupport"; |
| |
| /** |
| * Constant for thread contention support. |
| */ |
| private static final String CONTENTION_SUPPORT = |
| "gnu.java.lang.management.ThreadContentionSupport"; |
| |
| /** |
| * Constant for initial value of thread time support. |
| */ |
| private static final String TIME_ENABLED = |
| "gnu.java.lang.management.ThreadTimeInitallyEnabled"; |
| |
| /** |
| * Flag to indicate whether time monitoring is enabled or not. |
| */ |
| private boolean timeEnabled; |
| |
| /** |
| * Flag to indicate whether contention monitoring is enabled or not. |
| */ |
| private boolean contentionEnabled; |
| |
| /** |
| * Default constructor to set up flag states. The |
| * VM has to specify whether time monitoring is initially |
| * enabled or not. |
| * |
| * @throws NotCompliantMBeanException if this class doesn't implement |
| * the interface or a method appears |
| * in the interface that doesn't comply |
| * with the naming conventions. |
| */ |
| public ThreadMXBeanImpl() |
| throws NotCompliantMBeanException |
| { |
| super(ThreadMXBean.class); |
| timeEnabled = Boolean.parseBoolean(SystemProperties.getProperty(TIME_ENABLED)); |
| contentionEnabled = false; |
| } |
| |
| public long[] findMonitorDeadlockedThreads() |
| { |
| checkMonitorPermissions(); |
| return VMThreadMXBeanImpl.findMonitorDeadlockedThreads(); |
| } |
| |
| public long[] getAllThreadIds() |
| { |
| checkMonitorPermissions(); |
| return VMThreadMXBeanImpl.getAllThreadIds(); |
| } |
| |
| public long getCurrentThreadCpuTime() |
| { |
| if (!isCurrentThreadCpuTimeSupported()) |
| throw new UnsupportedOperationException("Current thread CPU " + |
| "time not supported."); |
| if (!timeEnabled) |
| return -1; |
| return VMThreadMXBeanImpl.getCurrentThreadCpuTime(); |
| } |
| |
| public long getCurrentThreadUserTime() |
| { |
| if (!isCurrentThreadCpuTimeSupported()) |
| throw new UnsupportedOperationException("Current thread user " + |
| "time not supported."); |
| if (!timeEnabled) |
| return -1; |
| return VMThreadMXBeanImpl.getCurrentThreadUserTime(); |
| } |
| |
| public int getDaemonThreadCount() |
| { |
| return VMThreadMXBeanImpl.getDaemonThreadCount(); |
| } |
| |
| public int getPeakThreadCount() |
| { |
| return VMThreadMXBeanImpl.getPeakThreadCount(); |
| } |
| |
| public int getThreadCount() |
| { |
| return VMThreadMXBeanImpl.getThreadCount(); |
| } |
| |
| public long getThreadCpuTime(long id) |
| { |
| if (!isThreadCpuTimeSupported()) |
| throw new UnsupportedOperationException("Thread CPU time not " + |
| "supported."); |
| if (id <= 0) |
| throw new IllegalArgumentException("Invalid thread id: " + id); |
| if (!timeEnabled) |
| return -1; |
| return VMThreadMXBeanImpl.getThreadCpuTime(id); |
| } |
| |
| public ThreadInfo getThreadInfo(long id) |
| { |
| return getThreadInfo(id, 0); |
| } |
| |
| public ThreadInfo[] getThreadInfo(long[] ids) |
| { |
| return getThreadInfo(ids, 0); |
| } |
| |
| public ThreadInfo getThreadInfo(long id, int maxDepth) |
| { |
| checkMonitorPermissions(); |
| if (id <= 0) |
| throw new IllegalArgumentException("Invalid thread id: " + id); |
| if (maxDepth < 0) |
| throw new IllegalArgumentException("Invalid depth: " + maxDepth); |
| return VMThreadMXBeanImpl.getThreadInfoForId(id, maxDepth); |
| } |
| |
| public ThreadInfo[] getThreadInfo(long[] ids, int maxDepth) |
| { |
| checkMonitorPermissions(); |
| if (maxDepth < 0) |
| throw new IllegalArgumentException("Invalid depth: " + maxDepth); |
| ThreadInfo[] infos = new ThreadInfo[ids.length]; |
| for (int a = 0; a < ids.length; ++a) |
| { |
| if (ids[a] <= 0) |
| throw new IllegalArgumentException("Invalid thread id " + a + |
| ": " + ids[a]); |
| infos[a] = VMThreadMXBeanImpl.getThreadInfoForId(ids[a], maxDepth); |
| } |
| return infos; |
| } |
| |
| public long getThreadUserTime(long id) |
| { |
| if (!isThreadCpuTimeSupported()) |
| throw new UnsupportedOperationException("Thread user time not " + |
| "supported."); |
| if (id <= 0) |
| throw new IllegalArgumentException("Invalid thread id: " + id); |
| if (!timeEnabled) |
| return -1; |
| return VMThreadMXBeanImpl.getThreadUserTime(id); |
| } |
| |
| public long getTotalStartedThreadCount() |
| { |
| return VMThreadMXBeanImpl.getTotalStartedThreadCount(); |
| } |
| |
| public boolean isCurrentThreadCpuTimeSupported() |
| { |
| if (isThreadCpuTimeSupported()) |
| return true; |
| return SystemProperties.getProperty(CURRENT_THREAD_TIME_SUPPORT) != null; |
| } |
| |
| public boolean isThreadContentionMonitoringEnabled() |
| { |
| if (isThreadContentionMonitoringSupported()) |
| return contentionEnabled; |
| else |
| throw new UnsupportedOperationException("Contention monitoring " + |
| "not supported."); |
| } |
| |
| public boolean isThreadContentionMonitoringSupported() |
| { |
| return SystemProperties.getProperty(CONTENTION_SUPPORT) != null; |
| } |
| |
| public boolean isThreadCpuTimeEnabled() |
| { |
| if (isThreadCpuTimeSupported() || |
| isCurrentThreadCpuTimeSupported()) |
| return timeEnabled; |
| else |
| throw new UnsupportedOperationException("Thread time not " + |
| "supported."); |
| } |
| |
| public boolean isThreadCpuTimeSupported() |
| { |
| return SystemProperties.getProperty(THREAD_TIME_SUPPORT) != null; |
| } |
| |
| public void resetPeakThreadCount() |
| { |
| checkControlPermissions(); |
| VMThreadMXBeanImpl.resetPeakThreadCount(); |
| } |
| |
| public void setThreadContentionMonitoringEnabled(boolean enable) |
| { |
| checkControlPermissions(); |
| if (isThreadContentionMonitoringSupported()) |
| contentionEnabled = enable; |
| else |
| throw new UnsupportedOperationException("Contention monitoring " + |
| "not supported."); |
| } |
| |
| public void setThreadCpuTimeEnabled(boolean enable) |
| { |
| checkControlPermissions(); |
| if (isThreadCpuTimeSupported() || |
| isCurrentThreadCpuTimeSupported()) |
| timeEnabled = enable; |
| else |
| throw new UnsupportedOperationException("Thread time not " + |
| "supported."); |
| } |
| |
| } |
| |