Package org.apache.solr.util.stats

Class MetricUtils

java.lang.Object

org.apache.solr.util.stats.MetricUtils

public class MetricUtils
extends Object

Metrics specific utility functions.

Field Summary

Fields

Modifier and Type	Field	Description
static String[]	OS_MXBEAN_CLASSES	These are well-known implementations of OperatingSystemMXBean.
static final String	VALUE

Constructor Summary

Constructors

Constructor	Description
MetricUtils()

Method Summary

Modifier and Type	Method	Description
static void	addMetrics(org.apache.solr.common.util.NamedList<Object> lst, com.codahale.metrics.Timer timer)	Adds metrics from a Timer to a NamedList, using well-known back-compat names.
static double	bytesToMegabytes(long bytes)	Converts bytes to megabytes.
static double	nsToMs(double ns)	Converts a double representing nanoseconds to a double representing milliseconds.

Methods inherited from class java.lang.Object

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

Field Details

VALUE

public static final String VALUE

See Also:

• Constant Field Values

OS_MXBEAN_CLASSES

public static String[] OS_MXBEAN_CLASSES

These are well-known implementations of OperatingSystemMXBean. Some of them provide additional useful properties beyond those declared by the interface.

Constructor Details

MetricUtils

public MetricUtils()

Method Details

addMetrics

public static void addMetrics(org.apache.solr.common.util.NamedList<Object> lst,
 com.codahale.metrics.Timer timer)

Adds metrics from a Timer to a NamedList, using well-known back-compat names.

Parameters:

lst - The NamedList to add the metrics data to

timer - The Timer to extract the metrics from

nsToMs

public static double nsToMs(double ns)

Converts a double representing nanoseconds to a double representing milliseconds.

Parameters:

ns - the amount of time in nanoseconds

Returns:

the amount of time in milliseconds

bytesToMegabytes

public static double bytesToMegabytes(long bytes)

Converts bytes to megabytes.

Parameters:

bytes - the number of bytes

Returns:

the number of megabytes