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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/gnu/java/lang/management/ThreadMXBeanImpl.java | |
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Diffstat (limited to 'libjava/classpath/gnu/java/lang/management/ThreadMXBeanImpl.java')
-rw-r--r-- | libjava/classpath/gnu/java/lang/management/ThreadMXBeanImpl.java | 350 |
1 files changed, 350 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/lang/management/ThreadMXBeanImpl.java b/libjava/classpath/gnu/java/lang/management/ThreadMXBeanImpl.java new file mode 100644 index 000000000..97040997b --- /dev/null +++ b/libjava/classpath/gnu/java/lang/management/ThreadMXBeanImpl.java @@ -0,0 +1,350 @@ +/* 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"; + + /** + * Constant for monitor usage monitoring support. + */ + private static final String MONITOR_SUPPORT = + "gnu.java.lang.management.MonitorUsageMonitoringSupport"; + + /** + * Constant for ownable synchronizer usage monitoring support. + */ + private static final String SYNCHRONIZER_SUPPORT = + "gnu.java.lang.management.OwnableSynchronizerUsageMonitoringSupport"; + + /** + * 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 ThreadInfo[] dumpAllThreads(boolean lockedMonitors, + boolean lockedSynchronizers) + { + return getThreadInfo(getAllThreadIds(), lockedMonitors, + lockedSynchronizers); + } + + public long[] findDeadlockedThreads() + { + checkMonitorPermissions(); + if (!isSynchronizerUsageSupported()) + throw new UnsupportedOperationException("Ownable synchronizer usage " + + "monitoring is not provided " + + "by this VM."); + return VMThreadMXBeanImpl.findDeadlockedThreads(); + } + + 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 ThreadInfo[] getThreadInfo(long[] ids, boolean lockedMonitors, + boolean lockedSynchronizers) + { + checkMonitorPermissions(); + if (lockedMonitors && !isObjectMonitorUsageSupported()) + throw new UnsupportedOperationException("Monitor usage monitoring is " + + "not provided by this VM."); + if (lockedSynchronizers && !isSynchronizerUsageSupported()) + throw new UnsupportedOperationException("Ownable synchronizer usage " + + "monitoring is not provided " + + "by this VM."); + ThreadInfo[] infos = getThreadInfo(ids, Integer.MAX_VALUE); + if (lockedMonitors) + for (ThreadInfo info : infos) + VMThreadMXBeanImpl.getMonitorInfo(info); + if (lockedSynchronizers) + for (ThreadInfo info : infos) + VMThreadMXBeanImpl.getLockInfo(info); + 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 isObjectMonitorUsageSupported() + { + return SystemProperties.getProperty(MONITOR_SUPPORT) != null; + } + + public boolean isSynchronizerUsageSupported() + { + return SystemProperties.getProperty(SYNCHRONIZER_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."); + } + +} |