org.eclipse.jetty.monitor

Class ThreadMonitor

java.lang.Object

org.eclipse.jetty.util.component.AbstractLifeCycle

org.eclipse.jetty.monitor.ThreadMonitor

All Implemented Interfaces:

Runnable, LifeCycle

@ManagedObject(value="Busy Thread Monitor")
public class ThreadMonitor
extends AbstractLifeCycle
implements Runnable

Nested Class Summary

Nested classes/interfaces inherited from class org.eclipse.jetty.util.component.AbstractLifeCycle

AbstractLifeCycle.AbstractLifeCycleListener

Nested classes/interfaces inherited from interface org.eclipse.jetty.util.component.LifeCycle

LifeCycle.Listener

Field Summary

Fields inherited from class org.eclipse.jetty.util.component.AbstractLifeCycle

FAILED, RUNNING, STARTED, STARTING, STOPPED, STOPPING

Constructor Summary

Constructors

Constructor and Description
ThreadMonitor() Instantiates a new thread monitor.
ThreadMonitor(int intervalMs) Instantiates a new thread monitor.
ThreadMonitor(int intervalMs, int threshold) Instantiates a new thread monitor.
ThreadMonitor(int intervalMs, int threshold, int depth) Instantiates a new thread monitor.
ThreadMonitor(int intervalMs, int threshold, int depth, int trail) Instantiates a new thread monitor.

Method Summary

Modifier and Type	Method and Description
void	doStart()
void	doStop()
protected long[]	getAllThreadIds() Retrieve all avaliable thread ids
int	getBusyThreshold() Gets the busy threshold.
Dumpable	getDumpable()
int	getLogInterval() Gets the log interval.
int	getLogThreshold() Gets the log threshold.
int	getScanInterval() Gets the scan interval.
int	getStackDepth() Gets the stack depth.
protected long	getThreadCpuTime(long id) Retrieve the cpu time for specified thread.
int	getTrailLength() Gets the stack trace trail length.
protected void	init() Initialize JMX objects.
void	logCpuUsage(int frequencyMs, int thresholdPercent) Enable logging of CPU usage.
protected void	logThreadInfo(boolean logAll)
void	run()
void	setBusyThreshold(int percent) Sets the busy threshold.
void	setDumpable(Dumpable dumpable)
void	setLogInterval(int ms) Sets the log interval.
void	setLogThreshold(int percent) Sets the log threshold.
void	setScanInterval(int ms) Sets the scan interval.
void	setStackDepth(int stackDepth) Sets the stack depth.
void	setTrailLength(int trailLength) Sets the stack trace trail length.

Methods inherited from class org.eclipse.jetty.util.component.AbstractLifeCycle

addLifeCycleListener, getState, getState, getStopTimeout, isFailed, isRunning, isStarted, isStarting, isStopped, isStopping, removeLifeCycleListener, setStopTimeout, start, stop

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ThreadMonitor

public ThreadMonitor()
              throws Exception

Instantiates a new thread monitor.

Throws:

Exception

ThreadMonitor

public ThreadMonitor(int intervalMs)
              throws Exception

Instantiates a new thread monitor.

Parameters:

intervalMs - scan interval

Throws:

Exception

ThreadMonitor

public ThreadMonitor(int intervalMs,
                     int threshold)
              throws Exception

Instantiates a new thread monitor.

Parameters:

intervalMs - scan interval

threshold - busy threshold

Throws:

Exception

ThreadMonitor

public ThreadMonitor(int intervalMs,
                     int threshold,
                     int depth)
              throws Exception

Instantiates a new thread monitor.

Parameters:

intervalMs - scan interval

threshold - busy threshold

depth - stack compare depth

Throws:

Exception

ThreadMonitor

public ThreadMonitor(int intervalMs,
                     int threshold,
                     int depth,
                     int trail)
              throws Exception

Instantiates a new thread monitor.

Parameters:

intervalMs - scan interval

threshold - busy threshold

depth - stack compare depth

trail - length of stack trail

Throws:

Exception

Method Detail

getScanInterval

public int getScanInterval()

Gets the scan interval.

Returns:

the scan interval

setScanInterval

public void setScanInterval(int ms)

Sets the scan interval.

Parameters:

ms - the new scan interval

getLogInterval

public int getLogInterval()

Gets the log interval.

Returns:

the log interval

setLogInterval

public void setLogInterval(int ms)

Sets the log interval.

Parameters:

ms - the new log interval

getBusyThreshold

public int getBusyThreshold()

Gets the busy threshold.

Returns:

the busy threshold

setBusyThreshold

public void setBusyThreshold(int percent)

Sets the busy threshold.

Parameters:

percent - the new busy threshold

getLogThreshold

public int getLogThreshold()

Gets the log threshold.

Returns:

the log threshold

setLogThreshold

public void setLogThreshold(int percent)

Sets the log threshold.

Parameters:

percent - the new log threshold

getStackDepth

public int getStackDepth()

Gets the stack depth.

Returns:

the stack depth

setStackDepth

public void setStackDepth(int stackDepth)

Sets the stack depth.

Parameters:

stackDepth - the new stack depth

setTrailLength

public void setTrailLength(int trailLength)

Sets the stack trace trail length.

Parameters:

trailLength - the new trail length

getTrailLength

public int getTrailLength()

Gets the stack trace trail length.

Returns:

the trail length

logCpuUsage

public void logCpuUsage(int frequencyMs,
                        int thresholdPercent)

Enable logging of CPU usage.

Parameters:

frequencyMs - the logging frequency

thresholdPercent - the logging threshold

getDumpable

public Dumpable getDumpable()

Returns:

A Dumpable that is dumped whenever spinning threads are detected

setDumpable

public void setDumpable(Dumpable dumpable)

Parameters:

dumpable - A Dumpable that is dumped whenever spinning threads are detected

doStart

public void doStart()

Overrides:

doStart in class AbstractLifeCycle

See Also:

AbstractLifeCycle.doStart()

doStop

public void doStop()

Overrides:

doStop in class AbstractLifeCycle

See Also:

AbstractLifeCycle.doStop()

getAllThreadIds

protected long[] getAllThreadIds()

Retrieve all avaliable thread ids

Returns:

array of thread ids

getThreadCpuTime

protected long getThreadCpuTime(long id)

Retrieve the cpu time for specified thread.

Parameters:

id - thread id

Returns:

cpu time of the thread

init

protected void init()

Initialize JMX objects.

run

public void run()

Specified by:

run in interface Runnable

See Also:

Runnable.run()

logThreadInfo

protected void logThreadInfo(boolean logAll)