This MXBean interface
allows monitoring of thread usage
in a Java VM. A number of methods, such as getThreadCount(
) and getPeakThreadCount( ), return
information about all running threads. Other methods return
information about individual threads. Threads are identified by their
thread id, which is a long integer.
getAllThreadIds(
) returns all ids as an array of
long. Complete information, including stack trace,
about a thread or set of threads can be obtained with the
getTHReadInfo( ) methods, which return
ThreadInfo objects.
If isThreadCpuTimeSupported(
) returns TRue, you can
enable thread timing with setThreadCpuTimeEnabled(
) and query the runtime of a specific thread
with getThreadCpuTime(
) and getThreadUserTime( ).
The values returned by these methods are measured in nanoseconds.
One of the potentially most useful methods of this interface is
findMonitorDeadlockedThreads(
) . It looks for cycles of
threads that are deadlocked waiting to lock objects whose locks are
held by other threads in the cycle.
public interface ThreadMXBean {
// Public Instance Methods
long[ ] findMonitorDeadlockedThreads( );
long[ ] getAllThreadIds( );
long getCurrentThreadCpuTime( );
long getCurrentThreadUserTime( );
int getDaemonThreadCount( );
int getPeakThreadCount( );
int getThreadCount( );
long getThreadCpuTime(long id);
ThreadInfo getThreadInfo(long id);
ThreadInfo[ ] getThreadInfo(long[ ] ids);
ThreadInfo[ ] getThreadInfo(long[ ] ids, int maxDepth);
ThreadInfo getThreadInfo(long id, int maxDepth);
long getThreadUserTime(long id);
long getTotalStartedThreadCount( );
boolean isCurrentThreadCpuTimeSupported( );
boolean isThreadContentionMonitoringEnabled( );
boolean isThreadContentionMonitoringSupported( );
boolean isThreadCpuTimeEnabled( );
boolean isThreadCpuTimeSupported( );
void resetPeakThreadCount( );
void setThreadContentionMonitoringEnabled(boolean enable);
void setThreadCpuTimeEnabled(boolean enable);
}
