kieker.monitoring.probe.servlet

Class GCServletContextListener

java.lang.Object

kieker.monitoring.probe.servlet.AbstractRegularSamplingServletContextListener

kieker.monitoring.probe.servlet.GCServletContextListener

All Implemented Interfaces:

java.util.EventListener, javax.servlet.ServletContextListener

public class GCServletContextListener
extends AbstractRegularSamplingServletContextListener

Starts and stops the periodic logging of garbage collection.
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>GCServletContextListener.samplingIntervalSeconds</param-name>
  <param-value>15</param-value>
 </context-param>
 
  <context-param>
   <param-name>GCServletContextListener.initialSamplingDelaySeconds</param-name>
  <param-value>0</param-value>
 </context-param>
 
 <listener>
   <listener-class>
     kieker.monitoring.probe.servlet.GCServletContextListener
   </listener-class>
 </listener>
 
 ... 
 </web-app>
 }
 

Since:

1.10

Author:

Nils Christian Ehmke

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	CONTEXT_PARAM_NAME_INITIAL_SAMPLING_DELAY_SECONDS Parameter name for the initial delay to be used in the web.xml file.
static java.lang.String	CONTEXT_PARAM_NAME_SAMPLING_INTERVAL_SECONDS Parameter name for the sampling interval to be used in the web.xml file.

Fields inherited from class kieker.monitoring.probe.servlet.AbstractRegularSamplingServletContextListener

DEFAULT_SENSOR_INITIAL_DELAY_SECONDS, DEFAULT_SENSOR_INTERVAL_SECONDS

Constructor Summary

Constructors

Constructor and Description
GCServletContextListener() Empty constructor.

Method Summary

Methods

Modifier and Type	Method and Description
protected ISampler[]	createSamplers() Create samplers for the specific sampling class.
protected java.lang.String	getContextParameterNameSamplingDelaySeconds() Parameter name for the sampling delay to be used in the web.xml file.
protected java.lang.String	getContextParameterNameSamplingIntervalSeconds() Parameter name for the sampling interval to be used in the web.xml file.

Methods inherited from class kieker.monitoring.probe.servlet.AbstractRegularSamplingServletContextListener

contextDestroyed, contextInitialized

Methods inherited from class java.lang.Object

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

Field Detail

CONTEXT_PARAM_NAME_SAMPLING_INTERVAL_SECONDS

public static final java.lang.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 java.lang.String CONTEXT_PARAM_NAME_INITIAL_SAMPLING_DELAY_SECONDS

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

Constructor Detail

GCServletContextListener

public GCServletContextListener()

Empty constructor.

Method Detail

getContextParameterNameSamplingIntervalSeconds

protected java.lang.String getContextParameterNameSamplingIntervalSeconds()

Description copied from class: AbstractRegularSamplingServletContextListener

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

Specified by:

getContextParameterNameSamplingIntervalSeconds in class AbstractRegularSamplingServletContextListener

Returns:

the parameter name

getContextParameterNameSamplingDelaySeconds

protected java.lang.String getContextParameterNameSamplingDelaySeconds()

Description copied from class: AbstractRegularSamplingServletContextListener

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

Specified by:

getContextParameterNameSamplingDelaySeconds in class AbstractRegularSamplingServletContextListener

Returns:

the parameter name

createSamplers

protected ISampler[] createSamplers()

Description copied from class: AbstractRegularSamplingServletContextListener

Create samplers for the specific sampling class.

Specified by:

createSamplers in class AbstractRegularSamplingServletContextListener

Returns:

array of samplers