Package io.prometheus.client.servlet.common.filter

Class Filter

java.lang.Object

io.prometheus.client.servlet.common.filter.Filter

public class Filter
extends Object

Filter implements the common functionality provided by the two MetricsFilter implementations:

• javax version: io.prometheus.client.filter.MetricsFilter provided by simpleclient_servlet
• jakarta version: io.prometheus.client.servlet.jakarta.filter.MetricsFilter provided by simpleclient_servlet_jakarta

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	Filter.MetricData

Field Summary

Fields

Modifier and Type	Field	Description
(package private) static final String	BUCKET_CONFIG_PARAM
private double[]	buckets
private String	help
(package private) static final String	HELP_PARAM
private Histogram	histogram
(package private) static final String	METRIC_NAME_PARAM
private String	metricName
(package private) static final String	PATH_COMPONENT_PARAM
(package private) int	pathComponents
private Counter	statusCounter
(package private) static final String	STRIP_CONTEXT_PATH_PARAM
(package private) boolean	stripContextPath

Constructor Summary

Constructors

Constructor	Description
Filter()
Filter(String metricName, String help, Integer pathComponents, double[] buckets, boolean stripContextPath)	If you want to configure the filter programmatically instead of via web.xml, you can pass all configuration parameters to this constructor.

Method Summary

Modifier and Type	Method	Description
private String	getComponents(String str)
void	init(FilterConfigAdapter filterConfig)	Common implementation of javax.servlet.Filter.init() and jakarta.servlet.Filter.init().
private boolean	isEmpty(String s)
void	observeDuration(Filter.MetricData data, HttpServletResponseAdapter resp)	To be called at the end of javax.servlet.Filter.doFilter() or jakarta.servlet.Filter.doFilter().
Filter.MetricData	startTimer(HttpServletRequestAdapter request)	To be called at the beginning of javax.servlet.Filter.doFilter() or jakarta.servlet.Filter.doFilter().

Methods inherited from class java.lang.Object

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

Field Details

PATH_COMPONENT_PARAM

static final String PATH_COMPONENT_PARAM

See Also:

• Constant Field Values

HELP_PARAM

static final String HELP_PARAM

See Also:

• Constant Field Values

METRIC_NAME_PARAM

static final String METRIC_NAME_PARAM

See Also:

• Constant Field Values

BUCKET_CONFIG_PARAM

static final String BUCKET_CONFIG_PARAM

See Also:

• Constant Field Values

STRIP_CONTEXT_PATH_PARAM

static final String STRIP_CONTEXT_PATH_PARAM

See Also:

• Constant Field Values

histogram

private Histogram histogram

statusCounter

private Counter statusCounter

pathComponents

int pathComponents

metricName

private String metricName

stripContextPath

boolean stripContextPath

help

private String help

buckets

private double[] buckets

Constructor Details

Filter

public Filter()

Filter

public Filter(String metricName,
 String help,
 Integer pathComponents,
 double[] buckets,
 boolean stripContextPath)

If you want to configure the filter programmatically instead of via web.xml, you can pass all configuration parameters to this constructor.

Method Details

isEmpty

private boolean isEmpty(String s)

getComponents

private String getComponents(String str)

init

public void init(FilterConfigAdapter filterConfig)
          throws FilterConfigurationException

Common implementation of javax.servlet.Filter.init() and jakarta.servlet.Filter.init().

Throws:

FilterConfigurationException

startTimer

public Filter.MetricData startTimer(HttpServletRequestAdapter request)

To be called at the beginning of javax.servlet.Filter.doFilter() or jakarta.servlet.Filter.doFilter().

observeDuration

public void observeDuration(Filter.MetricData data,
 HttpServletResponseAdapter resp)

To be called at the end of javax.servlet.Filter.doFilter() or jakarta.servlet.Filter.doFilter().