kieker.monitoring.probe.servlet
Class CPUsCombinedServletContextListener

java.lang.Object
  kieker.monitoring.probe.servlet.CPUsCombinedServletContextListener

All Implemented Interfaces:

EventListener, javax.servlet.ServletContextListener

public class CPUsCombinedServletContextListener
extends Object
implements javax.servlet.ServletContextListener

Starts and stops the periodic logging of CPU utilization employing the SigarSamplerFactory as the Servlet is initialized and destroyed respectively.
The initial delay and the sampling period (both given in seconds) can be configured via context-params in the web.xml file, as shown below.

The integration and configuration in a web.xml file works as follows:

 <web-app>
  ...
  
 <context-param>
  <param-name>CPUsCombinedServletContextListener.samplingIntervalSeconds</param-name>
  <param-value>15</param-value>
 </context-param>
 
  <context-param>
   <param-name>CPUsCombinedServletContextListener.initialSamplingDelaySeconds</param-name>
  <param-value>0</param-value>
 </context-param>
 
 <listener>
   <listener-class>
     kieker.monitoring.probe.servlet.CPUsCombinedServletContextListener
   </listener-class>
 </listener>
 
 ... 
 </web-app>
 }
 

Since:

1.3

Author:

Andre van Hoorn

Field Summary

static String	CONTEXT_PARAM_NAME_INITIAL_SAMPLING_DELAY_SECONDS Parameter name for the initial delay to be used in the web.xml file.
static String	CONTEXT_PARAM_NAME_SAMPLING_INTERVAL_SECONDS Parameter name for the sampling interval to be used in the web.xml file.
static long	DEFAULT_SENSOR_INITIAL_DELAY_SECONDS The default used initial delay in seconds.
static long	DEFAULT_SENSOR_INTERVAL_SECONDS The default used sensor interval in seconds.

Constructor Summary

CPUsCombinedServletContextListener()
Creates a new instance of this class.

Method Summary

void	contextDestroyed(javax.servlet.ServletContextEvent sce)
void	contextInitialized(javax.servlet.ServletContextEvent sce)

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_SENSOR_INTERVAL_SECONDS

public static final long DEFAULT_SENSOR_INTERVAL_SECONDS

The default used sensor interval in seconds.

See Also:

Constant Field Values

DEFAULT_SENSOR_INITIAL_DELAY_SECONDS

public static final long DEFAULT_SENSOR_INITIAL_DELAY_SECONDS

The default used initial delay in seconds.

See Also:

Constant Field Values

CONTEXT_PARAM_NAME_SAMPLING_INTERVAL_SECONDS

public static final String CONTEXT_PARAM_NAME_SAMPLING_INTERVAL_SECONDS

Parameter name for the sampling interval to be used in the web.xml file.

CONTEXT_PARAM_NAME_INITIAL_SAMPLING_DELAY_SECONDS

public static final String CONTEXT_PARAM_NAME_INITIAL_SAMPLING_DELAY_SECONDS

Parameter name for the initial delay to be used in the web.xml file.

Constructor Detail

CPUsCombinedServletContextListener

public CPUsCombinedServletContextListener()

Creates a new instance of this class.

Method Detail

contextDestroyed

public void contextDestroyed(javax.servlet.ServletContextEvent sce)

Specified by:

contextDestroyed in interface javax.servlet.ServletContextListener

contextInitialized

public void contextInitialized(javax.servlet.ServletContextEvent sce)

Specified by:

contextInitialized in interface javax.servlet.ServletContextListener