org.apache.catalina.valves
Class StuckThreadDetectionValve

java.lang.Object
  org.apache.catalina.util.LifecycleBase
      org.apache.catalina.util.LifecycleMBeanBase
          org.apache.catalina.valves.ValveBase
              org.apache.catalina.valves.StuckThreadDetectionValve

All Implemented Interfaces:

MBeanRegistration, Contained, Lifecycle, Valve

public class StuckThreadDetectionValve
extends ValveBase

This valve allows to detect requests that take a long time to process, which might indicate that the thread that is processing it is stuck. Based on code proposed by TomLu in Bugzilla entry #50306

Author:

slaurent

Field Summary

Fields inherited from class org.apache.catalina.valves.ValveBase

asyncSupported, container, containerLog, next

Fields inherited from class org.apache.catalina.util.LifecycleMBeanBase

mserver

Fields inherited from interface org.apache.catalina.Lifecycle

AFTER_DESTROY_EVENT, AFTER_INIT_EVENT, AFTER_START_EVENT, AFTER_STOP_EVENT, BEFORE_DESTROY_EVENT, BEFORE_INIT_EVENT, BEFORE_START_EVENT, BEFORE_STOP_EVENT, CONFIGURE_START_EVENT, CONFIGURE_STOP_EVENT, PERIODIC_EVENT, START_EVENT, STOP_EVENT

Constructor Summary

StuckThreadDetectionValve()
Required to enable async support.

Method Summary

void	backgroundProcess() Execute a periodic task, such as reloading, etc.
String	getInfo() Return descriptive information about this Valve implementation.
long[]	getStuckThreadIds()
int	getThreshold()
protected void	initInternal() Sub-classes wishing to perform additional initialization should override this method, ensuring that super.initInternal() is the first call in the overriding method.
void	invoke(Request request, Response response) The implementation-specific logic represented by this Valve.
void	setThreshold(int threshold) Specify the threshold (in seconds) used when checking for stuck threads.

Methods inherited from class org.apache.catalina.valves.ValveBase

event, getContainer, getDomainInternal, getNext, getObjectNameKeyProperties, isAsyncSupported, setAsyncSupported, setContainer, setNext, startInternal, stopInternal, toString

Methods inherited from class org.apache.catalina.util.LifecycleMBeanBase

destroyInternal, getDomain, getObjectName, postDeregister, postRegister, preDeregister, preRegister, register, setDomain, unregister

Methods inherited from class org.apache.catalina.util.LifecycleBase

addLifecycleListener, destroy, findLifecycleListeners, fireLifecycleEvent, getState, getStateName, init, removeLifecycleListener, setState, setState, start, stop

Methods inherited from class java.lang.Object

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

Constructor Detail

StuckThreadDetectionValve

public StuckThreadDetectionValve()

Required to enable async support.

Method Detail

setThreshold

public void setThreshold(int threshold)

Specify the threshold (in seconds) used when checking for stuck threads. If <=0, the detection is disabled. The default is 600 seconds.

Parameters:

threshold - The new threshold in seconds

getThreshold

public int getThreshold()

Returns:

The current threshold in seconds

See Also:

setThreshold(int)

initInternal

protected void initInternal()
                     throws LifecycleException

Description copied from class: LifecycleMBeanBase

Sub-classes wishing to perform additional initialization should override this method, ensuring that super.initInternal() is the first call in the overriding method.

Overrides:

initInternal in class ValveBase

Throws:

LifecycleException

getInfo

public String getInfo()

Return descriptive information about this Valve implementation.

Specified by:

getInfo in interface Valve

Overrides:

getInfo in class ValveBase

invoke

public void invoke(Request request,
                   Response response)
            throws IOException,
                   ServletException

The implementation-specific logic represented by this Valve. See the Valve description for the normal design patterns for this method.

This method MUST be provided by a subclass.

Specified by:

invoke in interface Valve

Specified by:

invoke in class ValveBase

Parameters:

request - The servlet request to be processed

response - The servlet response to be created

Throws:

IOException - if an input/output error occurs

ServletException - if a servlet error occurs

backgroundProcess

public void backgroundProcess()

Description copied from class: ValveBase

Execute a periodic task, such as reloading, etc. This method will be invoked inside the classloading context of this container. Unexpected throwables will be caught and logged.

Specified by:

backgroundProcess in interface Valve

Overrides:

backgroundProcess in class ValveBase

getStuckThreadIds

public long[] getStuckThreadIds()