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Java Source Code / Java Documentation » Apache Harmony Java SE » java package » java.lang.management

Source Cross Reference Class Diagram Java Document (Java Doc)

java.lang.management .ThreadMXBean

ThreadMXBean

public interface ThreadMXBean (Code)

ThreadMXBean is an interface used by the management system to access thread-related properties.

ObjectName: java.lang:type=Threading

since:
1.5

Method Summary
long[]	findMonitorDeadlockedThreads() Finds cycles of threads that are in deadlock waiting to acquire and object monitor.
long[]	getAllThreadIds() The ID of all currently live threads.
long	getCurrentThreadCpuTime() The total CPU time (in nanoseconds) for the current thread.
long	getCurrentThreadUserTime() The total user time (in nanoseconds) for the current thread.
int	getDaemonThreadCount() The current number of live daemon threads.
int	getPeakThreadCount() The peak number of live threads since JVM start or the last reset.
int	getThreadCount() The current number of live threads (daemon and non-daemon).
long	getThreadCpuTime(long id) The total CPU time (in nanoseconds) for the given thread. Parameters: id - The ID of the thread to get the CPU time for.
ThreadInfo	getThreadInfo(long id) The thread information for the given thread with a stack trace depth of zero. Parameters: id - The ID of the thread to get information for.
ThreadInfo[]	getThreadInfo(long[] ids) The thread information for the given threads with a stack trace depth of zero. Parameters: ids - An array of IDs of the threads to get information for.
ThreadInfo[]	getThreadInfo(long[] ids, int maxDepth) The thread information for the given threads, which is qualified by a maximum stack trace depth. Parameters: ids - An array of IDs of the threads to get information for. Parameters: maxDepth - The maximum depth of the stack trace to return in theThreadInfo.
ThreadInfo	getThreadInfo(long id, int maxDepth) The thread information for the given thread with a stack trace depth of zero. Parameters: id - The ID of the thread to get information for. Parameters: maxDepth - The maximum depth of the stack trace to return in theThreadInfo.
long	getThreadUserTime(long id) The total user time (in nanoseconds) for the given thread. Parameters: id - The ID of the thread to get the user time for.
long	getTotalStartedThreadCount() The total number of threads that have been created and started within the JVM.
boolean	isCurrentThreadCpuTimeSupported() Indicates whether or not current thread CPU time monitoring is supported.
boolean	isThreadContentionMonitoringEnabled() Indicates whether or not thread contention monitoring is enabled.
boolean	isThreadContentionMonitoringSupported() Indicates whether or not thread contention monitoring is supported.
boolean	isThreadCpuTimeEnabled() Indicates whether or not thread CPU time monitoring is enabled.
boolean	isThreadCpuTimeSupported() Indicates whether or not thread CPU time monitoring is supported.
void	resetPeakThreadCount() Resets the peak thread count to the current thread count.
void	setThreadContentionMonitoringEnabled(boolean enable) Enables or disables thread contention monitoring.
void	setThreadCpuTimeEnabled(boolean enable) Enables or disables thread CPU time monitoring.

Method Detail

findMonitorDeadlockedThreads
long[] findMonitorDeadlockedThreads()(Code)
	Finds cycles of threads that are in deadlock waiting to acquire and object monitor. An array of thread IDs of deadlocked. throws: SecurityException - if caller doesn't have`ManagementPermission("monitor")`. See Also: Thread.getId

getAllThreadIds
long[] getAllThreadIds()(Code)
	The ID of all currently live threads. An array of thread IDs. throws: SecurityException - if caller doesn't have`ManagementPermission("monitor")`. See Also: Thread.getId

getCurrentThreadCpuTime
long getCurrentThreadCpuTime()(Code)
	The total CPU time (in nanoseconds) for the current thread. This is convenience method for ThreadMXBean.getThreadCpuTime(long) getThreadCpuTime `(Thread.currentThread().getId());`. The total CPU time for the current thread. throws: UnsupportedOperationException - if this is not supported.

getCurrentThreadUserTime
long getCurrentThreadUserTime()(Code)
	The total user time (in nanoseconds) for the current thread. This is convenience method for ThreadMXBean.getThreadUserTime(long) getThreadUserTime `(Thread.currentThread().getId());`. The total user time for the current thread. throws: UnsupportedOperationException - if this is not supported.

getDaemonThreadCount
int getDaemonThreadCount()(Code)
	The current number of live daemon threads. The number of daemon threads.

getPeakThreadCount
int getPeakThreadCount()(Code)
	The peak number of live threads since JVM start or the last reset. The peak number of threads. See Also: ThreadMXBean.resetPeakThreadCount()

getThreadCount
int getThreadCount()(Code)
	The current number of live threads (daemon and non-daemon). The number of threads.

getThreadCpuTime
long getThreadCpuTime(long id)(Code)
	The total CPU time (in nanoseconds) for the given thread. Parameters: id - The ID of the thread to get the CPU time for. The total CPU time for the current thread or -1 if the thread isnot alive or measurement is not enabled. throws: IllegalArgumentException - if `id` is less than orequal to 0. throws: UnsupportedOperationException - if this is not supported.

getThreadInfo
ThreadInfo getThreadInfo(long id)(Code)
	The thread information for the given thread with a stack trace depth of zero. Parameters: id - The ID of the thread to get information for. A ThreadInfo instance representing the information of thegiven thread or `null` if the thread is not alive ordoesn't exist. throws: IllegalArgumentException - if `id` is less than orequal to 0. throws: SecurityException - if caller doesn't have`ManagementPermission("monitor")`.

getThreadInfo
ThreadInfo[] getThreadInfo(long[] ids)(Code)
	The thread information for the given threads with a stack trace depth of zero. Parameters: ids - An array of IDs of the threads to get information for. An array of ThreadInfo instance representing theinformation of the given threads. throws: IllegalArgumentException - if and element in `ids` isless than or equal to 0. throws: SecurityException - if caller doesn't have`ManagementPermission("monitor")`.

getThreadInfo
ThreadInfo[] getThreadInfo(long[] ids, int maxDepth)(Code)
	The thread information for the given threads, which is qualified by a maximum stack trace depth. Parameters: ids - An array of IDs of the threads to get information for. Parameters: maxDepth - The maximum depth of the stack trace to return in theThreadInfo. If zero, then an empty array is stored. IfInteger.MAX_VALUE, then the entire stack trace isreturned. An array of ThreadInfo instance representing theinformation of the given threads. throws: IllegalArgumentException - if and element in `ids` isless than or equal to 0. throws: SecurityException - if caller doesn't have`ManagementPermission("monitor")`.

getThreadInfo
ThreadInfo getThreadInfo(long id, int maxDepth)(Code)
	The thread information for the given thread with a stack trace depth of zero. Parameters: id - The ID of the thread to get information for. Parameters: maxDepth - The maximum depth of the stack trace to return in theThreadInfo. If zero, then an empty array is stored. IfInteger.MAX_VALUE, then the entire stack trace isreturned. A ThreadInfo instance representing the information of thegiven thread or `null` if the thread is not alive ordoesn't exist. throws: IllegalArgumentException - if `id` is less than orequal to 0. throws: SecurityException - if caller doesn't have`ManagementPermission("monitor")`.

getThreadUserTime
long getThreadUserTime(long id)(Code)
	The total user time (in nanoseconds) for the given thread. Parameters: id - The ID of the thread to get the user time for. The total user time for the current thread or -1 if the thread isnot alive or measurement is not enabled. throws: IllegalArgumentException - if `id` is less than orequal to 0. throws: UnsupportedOperationException - if this is not supported.

getTotalStartedThreadCount
long getTotalStartedThreadCount()(Code)
	The total number of threads that have been created and started within the JVM. The total number of created and started threads.

isCurrentThreadCpuTimeSupported
boolean isCurrentThreadCpuTimeSupported()(Code)
	Indicates whether or not current thread CPU time monitoring is supported. `true` if supported, otherwise `false`.

isThreadContentionMonitoringEnabled
boolean isThreadContentionMonitoringEnabled()(Code)
	Indicates whether or not thread contention monitoring is enabled. `true` if enabled, otherwise `false`.

isThreadContentionMonitoringSupported
boolean isThreadContentionMonitoringSupported()(Code)
	Indicates whether or not thread contention monitoring is supported. `true` if supported, otherwise `false`.

isThreadCpuTimeEnabled
boolean isThreadCpuTimeEnabled()(Code)
	Indicates whether or not thread CPU time monitoring is enabled. `true` if enabled, otherwise `false`.

isThreadCpuTimeSupported
boolean isThreadCpuTimeSupported()(Code)
	Indicates whether or not thread CPU time monitoring is supported. `true` if supported, otherwise `false`.

resetPeakThreadCount
void resetPeakThreadCount()(Code)
	Resets the peak thread count to the current thread count. throws: SecurityException - if caller doesn't have`ManagementPermission("control")`.

setThreadContentionMonitoringEnabled
void setThreadContentionMonitoringEnabled(boolean enable)(Code)
	Enables or disables thread contention monitoring. Parameters: enable - `true` to enable, `false` todisable. throws: UnsupportedOperationException - if this is not supported. throws: SecurityException - if caller doesn't have`ManagementPermission("control")`. See Also: ThreadMXBean.isThreadContentionMonitoringSupported()

setThreadCpuTimeEnabled
void setThreadCpuTimeEnabled(boolean enable)(Code)
	Enables or disables thread CPU time monitoring. Parameters: enable - `true` to enable, `false` todisable. throws: UnsupportedOperationException - if this is not supported. throws: SecurityException - if caller doesn't have`ManagementPermission("control")`. See Also: ThreadMXBean.isThreadCpuTimeSupported()

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