org.apache.geode

Interface Statistics

public interface Statistics

Instances of this interface maintain the values of various application-defined statistics. The statistics themselves are described by an instance of StatisticsType.

To get an instance of this interface use an instance of StatisticsFactory.

For improved performance, each statistic may be referred to by its descriptor.

For optimal performance, each statistic may be referred to by its id in the statistics object. Note that ids can not be mapped back to their name and methods that take ids are unsafe. It is important to call the correct type of method for the given id. For example if your stat is a long then incLong must be called instead of incDouble.

Note that as of the 5.1 release the incLong, and incDouble methods no longer return the new value of the statistic. They now return void. This incompatible change was made to allow for a more efficient concurrent increment implementation.

Since:

GemFire 3.0

See Also:

Package introduction

Method Summary

Modifier and Type	Method and Description
void	close() Closes these statistics.
Number	get(StatisticDescriptor descriptor) Returns the value of the identified statistic.
Number	get(String name) Returns the value of the named statistic.
double	getDouble(int id) Returns the value of the identified statistic of type double.
double	getDouble(StatisticDescriptor descriptor) Returns the value of the described statistic of type double.
double	getDouble(String name) Returns the value of the statistic of type double at the given name.
int	getInt(int id) Deprecated. as of Geode 1.10, use getLong(int) instead
int	getInt(StatisticDescriptor descriptor) Deprecated. as of Geode 1.10, use getLong(StatisticDescriptor) instead
int	getInt(String name) Deprecated. as of Geode 1.10, use getLong(String) instead
long	getLong(int id) Returns the value of the identified statistic of type long.
long	getLong(StatisticDescriptor descriptor) Returns the value of the described statistic of type long.
long	getLong(String name) Returns the value of the statistic of type long at the given name.
long	getNumericId() Gets the number associated with this instance that helps identify it.
long	getRawBits(StatisticDescriptor descriptor) Returns the bits that represent the raw value of the described statistic.
long	getRawBits(String name) Returns the bits that represent the raw value of the named statistic.
String	getTextId() Gets the text associated with this instance that helps identify it.
StatisticsType	getType() Gets the StatisticsType of this instance.
long	getUniqueId() Gets a value that uniquely identifies this statistics.
void	incDouble(int id, double delta) Increments the value of the identified statistic of type double by the given amount.
void	incDouble(StatisticDescriptor descriptor, double delta) Increments the value of the described statistic of type double by the given amount.
void	incDouble(String name, double delta) Increments the value of the statistic of type double with the given name by a given amount.
void	incInt(int id, int delta) Deprecated. as of Geode 1.10, use incLong(int, long) instead
void	incInt(StatisticDescriptor descriptor, int delta) Deprecated. as of Geode 1.10, use incLong(StatisticDescriptor, long) instead
void	incInt(String name, int delta) Deprecated. as of Geode 1.10, use incLong(String, long) instead
void	incLong(int id, long delta) Increments the value of the identified statistic of type long by the given amount.
void	incLong(StatisticDescriptor descriptor, long delta) Increments the value of the described statistic of type long by the given amount.
void	incLong(String name, long delta) Increments the value of the statistic of type long with the given name by a given amount.
boolean	isAtomic() Returns true if modifications are atomic.
boolean	isClosed() Returns true if the instance has been closed.
StatisticDescriptor	nameToDescriptor(String name) Returns the descriptor of the statistic with the given name in this statistics instance.
int	nameToId(String name) Returns the id of the statistic with the given name in this statistics instance.
void	setDouble(int id, double value) Sets the value of a statistic with the given id whose type is double.
void	setDouble(StatisticDescriptor descriptor, double value) Sets the value of a described statistic of type double
void	setDouble(String name, double value) Sets the value of a named statistic of type double.
DoubleSupplier	setDoubleSupplier(int id, DoubleSupplier supplier) Provide a callback to compute the value of this statistic every sample interval and use that as the value of the stat.
DoubleSupplier	setDoubleSupplier(StatisticDescriptor descriptor, DoubleSupplier supplier) Provide a callback to compute the value of this statistic every sample interval and use that as the value of the stat.
DoubleSupplier	setDoubleSupplier(String name, DoubleSupplier supplier) Provide a callback to compute the value of this statistic every sample interval and use that as the value of the stat.
void	setInt(int id, int value) Deprecated. as of Geode 1.10, use setLong(int, long) instead
void	setInt(StatisticDescriptor descriptor, int value) Deprecated. as of Geode 1.10, use setLong(StatisticDescriptor, long) instead
void	setInt(String name, int value) Deprecated. as of Geode 1.10, use setLong(String, long) instead
IntSupplier	setIntSupplier(int id, IntSupplier supplier) Deprecated. as of Geode 1.10, use setLongSupplier(int, LongSupplier) instead
IntSupplier	setIntSupplier(StatisticDescriptor descriptor, IntSupplier supplier) Deprecated. as of Geode 1.10, use setLongSupplier(StatisticDescriptor, LongSupplier) instead
IntSupplier	setIntSupplier(String name, IntSupplier supplier) Deprecated. as of Geode 1.10, use setLongSupplier(String, LongSupplier) instead
void	setLong(int id, long value) Sets the value of a statistic with the given id whose type is long.
void	setLong(StatisticDescriptor descriptor, long value) Sets the value of a described statistic of type long
void	setLong(String name, long value) Sets the value of a named statistic of type long.
LongSupplier	setLongSupplier(int id, LongSupplier supplier) Provide a callback to compute the value of this statistic every sample interval and use that as the value of the stat.
LongSupplier	setLongSupplier(StatisticDescriptor descriptor, LongSupplier supplier) Provide a callback to compute the value of this statistic every sample interval and use that as the value of the stat.
LongSupplier	setLongSupplier(String name, LongSupplier supplier) Provide a callback to compute the value of this statistic every sample interval and use that as the value of the stat.

Method Detail

close

void close()

Closes these statistics. After statistics have been closed, they are no longer archived. A value access on a closed statistics always results in zero. A value modification on a closed statistics is ignored.

nameToId

int nameToId(String name)

Returns the id of the statistic with the given name in this statistics instance.

Parameters:

name - the name of the statistic

Returns:

the id of the statistic

Throws:

IllegalArgumentException - No statistic named name exists in this statistics instance.

See Also:

StatisticsType.nameToId(java.lang.String)

nameToDescriptor

StatisticDescriptor nameToDescriptor(String name)

Returns the descriptor of the statistic with the given name in this statistics instance.

Parameters:

name - the name of the statistic

Returns:

the descriptor of the statistic

Throws:

IllegalArgumentException - No statistic named name exists in this statistics instance.

See Also:

StatisticsType.nameToDescriptor(java.lang.String)

getUniqueId

long getUniqueId()

Gets a value that uniquely identifies this statistics.

Returns:

a value that uniquely identifies this statistics

getType

StatisticsType getType()

Gets the StatisticsType of this instance.

Returns:

the StatisticsType of this instance

getTextId

String getTextId()

Gets the text associated with this instance that helps identify it.

Returns:

the text associated with this instance that helps identify it

getNumericId

long getNumericId()

Gets the number associated with this instance that helps identify it.

Returns:

the number associated with this instance that helps identify it

isAtomic

boolean isAtomic()

Returns true if modifications are atomic. This means that multiple threads, can safely modify this instance without extra synchronization.

Returns false if modifications are not atomic. This means that modifications to this instance are cheaper but not thread safe.

Returns:

whether modifications are atomic

isClosed

boolean isClosed()

Returns true if the instance has been closed.

Returns:

whether the instance has been closed.

setInt

@Deprecated
void setInt(int id,
                        int value)

Deprecated. as of Geode 1.10, use setLong(int, long) instead

Sets the value of a statistic with the given id whose type is int.

Parameters:

id - a statistic id obtained with nameToId(java.lang.String) or StatisticsType.nameToId(java.lang.String).

value - the value to set the statistic to

Throws:

ArrayIndexOutOfBoundsException - If the id is invalid.

setInt

@Deprecated
void setInt(String name,
                        int value)

Deprecated. as of Geode 1.10, use setLong(String, long) instead

Sets the value of a named statistic of type int

Parameters:

name - the name of the statistic

value - the value to set the statistic to

Throws:

IllegalArgumentException - If no statistic exists named name or if the statistic with name name is not of type int.

setInt

@Deprecated
void setInt(StatisticDescriptor descriptor,
                        int value)

Deprecated. as of Geode 1.10, use setLong(StatisticDescriptor, long) instead

Sets the value of a described statistic of type int

Parameters:

descriptor - a statistic descriptor obtained with nameToDescriptor(java.lang.String) or StatisticsType.nameToDescriptor(java.lang.String).

value - the value to set the statistic to

Throws:

IllegalArgumentException - If no statistic exists for the given descriptor or if the described statistic is not of type int.

setLong

void setLong(int id,
             long value)

Sets the value of a statistic with the given id whose type is long.

Parameters:

id - a statistic id obtained with nameToId(java.lang.String) or StatisticsType.nameToId(java.lang.String).

value - the value to set the statistic to

Throws:

ArrayIndexOutOfBoundsException - If the id is invalid.

setLong

void setLong(StatisticDescriptor descriptor,
             long value)

Sets the value of a described statistic of type long

Parameters:

descriptor - a statistic descriptor obtained with nameToDescriptor(java.lang.String) or StatisticsType.nameToDescriptor(java.lang.String).

value - the value to set the statistic to

Throws:

IllegalArgumentException - If no statistic exists for the given descriptor or if the described statistic is not of type long.

setLong

void setLong(String name,
             long value)

Sets the value of a named statistic of type long.

Parameters:

name - the name of the statistic

value - the value to set the statistic to

Throws:

IllegalArgumentException - If no statistic exists named name or if the statistic with name name is not of type long.

setDouble

void setDouble(int id,
               double value)

Sets the value of a statistic with the given id whose type is double.

Parameters:

id - a statistic id obtained with nameToId(java.lang.String) or StatisticsType.nameToId(java.lang.String).

value - the value to set the statistic to

Throws:

ArrayIndexOutOfBoundsException - If the id is invalid.

setDouble

void setDouble(StatisticDescriptor descriptor,
               double value)

Sets the value of a described statistic of type double

Parameters:

descriptor - a statistic descriptor obtained with nameToDescriptor(java.lang.String) or StatisticsType.nameToDescriptor(java.lang.String).

value - the value to set the statistic to

Throws:

IllegalArgumentException - If no statistic exists for the given descriptor or if the described statistic is not of type double.

setDouble

void setDouble(String name,
               double value)

Sets the value of a named statistic of type double.

Parameters:

name - the name of the statistic

value - the value to set the statistic to

Throws:

IllegalArgumentException - If no statistic exists named name or if the statistic with name name is not of type double.

getInt

@Deprecated
int getInt(int id)

Deprecated. as of Geode 1.10, use getLong(int) instead

Returns the value of the identified statistic of type int.

Parameters:

id - a statistic id obtained with nameToId(java.lang.String) or StatisticsType.nameToId(java.lang.String).

Returns:

the value of the statistic

Throws:

ArrayIndexOutOfBoundsException - If the id is invalid.

getInt

@Deprecated
int getInt(StatisticDescriptor descriptor)

Deprecated. as of Geode 1.10, use getLong(StatisticDescriptor) instead

Returns the value of the described statistic of type int.

Parameters:

descriptor - a statistic descriptor obtained with nameToDescriptor(java.lang.String) or StatisticsType.nameToDescriptor(java.lang.String).

Returns:

the value of the statistic

Throws:

IllegalArgumentException - If no statistic exists with the specified descriptor or if the described statistic is not of type int.

getInt

@Deprecated
int getInt(String name)

Deprecated. as of Geode 1.10, use getLong(String) instead

Returns the value of the statistic of type int at the given name.

Parameters:

name - the name of the statistic

Returns:

the value of the statistic

Throws:

IllegalArgumentException - If no statistic exists with name name or if the statistic named name is not of type int.

getLong

long getLong(int id)

Returns the value of the identified statistic of type long.

Parameters:

id - a statistic id obtained with nameToId(java.lang.String) or StatisticsType.nameToId(java.lang.String).

Returns:

the value of the statistic

Throws:

ArrayIndexOutOfBoundsException - If the id is invalid.

getLong

long getLong(StatisticDescriptor descriptor)

Returns the value of the described statistic of type long.

Parameters:

descriptor - a statistic descriptor obtained with nameToDescriptor(java.lang.String) or StatisticsType.nameToDescriptor(java.lang.String).

Returns:

the value of the statistic

Throws:

IllegalArgumentException - If no statistic exists with the specified descriptor or if the described statistic is not of type long.

getLong

long getLong(String name)

Returns the value of the statistic of type long at the given name.

Parameters:

name - the name of the statistic

Returns:

the value of the statistic

Throws:

IllegalArgumentException - If no statistic exists with name name or if the statistic named name is not of type long.

getDouble

double getDouble(int id)

Returns the value of the identified statistic of type double.

Parameters:

id - a statistic id obtained with nameToId(java.lang.String) or StatisticsType.nameToId(java.lang.String).

Returns:

the value of the statistic

Throws:

ArrayIndexOutOfBoundsException - If the id is invalid.

getDouble

double getDouble(StatisticDescriptor descriptor)

Returns the value of the described statistic of type double.

Parameters:

descriptor - a statistic descriptor obtained with nameToDescriptor(java.lang.String) or StatisticsType.nameToDescriptor(java.lang.String).

Returns:

the value of the statistic

Throws:

IllegalArgumentException - If no statistic exists with the specified descriptor or if the described statistic is not of type double.

getDouble

double getDouble(String name)

Returns the value of the statistic of type double at the given name.

Parameters:

name - the name of the statistic

Returns:

the value of the statistic

Throws:

IllegalArgumentException - If no statistic exists with name name or if the statistic named name is not of type double.

get

Number get(StatisticDescriptor descriptor)

Returns the value of the identified statistic.

Parameters:

descriptor - a statistic descriptor obtained with nameToDescriptor(java.lang.String) or StatisticsType.nameToDescriptor(java.lang.String).

Returns:

the value of the statistic

Throws:

IllegalArgumentException - If the described statistic does not exist

get

Number get(String name)

Returns the value of the named statistic.

Parameters:

name - the name of the statistic

Returns:

the value of the statistic

Throws:

IllegalArgumentException - If the named statistic does not exist

getRawBits

long getRawBits(StatisticDescriptor descriptor)

Returns the bits that represent the raw value of the described statistic.

Parameters:

descriptor - a statistic descriptor obtained with nameToDescriptor(java.lang.String) or StatisticsType.nameToDescriptor(java.lang.String).

Returns:

the bits that represent the raw value of the named statistic

Throws:

IllegalArgumentException - If the described statistic does not exist

getRawBits

long getRawBits(String name)

Returns the bits that represent the raw value of the named statistic.

Parameters:

name - the name of the statistic

Returns:

the bits that represent the raw value of the named statistic

Throws:

IllegalArgumentException - If the named statistic does not exist

incInt

@Deprecated
void incInt(int id,
                        int delta)

Deprecated. as of Geode 1.10, use incLong(int, long) instead

Increments the value of the identified statistic of type int by the given amount.

Parameters:

id - a statistic id obtained with nameToId(java.lang.String) or StatisticsType.nameToId(java.lang.String).

delta - the amount by which to increment the statistic value

Throws:

ArrayIndexOutOfBoundsException - If the id is invalid.

incInt

@Deprecated
void incInt(StatisticDescriptor descriptor,
                        int delta)

Deprecated. as of Geode 1.10, use incLong(StatisticDescriptor, long) instead

Increments the value of the described statistic of type int by the given amount.

Parameters:

descriptor - the descriptor for the statistic to increment

delta - the amount by which to increment the statistic value

Throws:

IllegalArgumentException - If no statistic exists with the given descriptor or if the described statistic is not of type int.

incInt

@Deprecated
void incInt(String name,
                        int delta)

Deprecated. as of Geode 1.10, use incLong(String, long) instead

Increments the value of the statistic of type int with the given name by a given amount.

Parameters:

name - the name of the statistic to increment

delta - the amount by which to increment the statistic value

Throws:

IllegalArgumentException - If no statistic exists with name name or if the statistic named name is not of type int.

incLong

void incLong(int id,
             long delta)

Increments the value of the identified statistic of type long by the given amount.

Parameters:

id - a statistic id obtained with nameToId(java.lang.String) or StatisticsType.nameToId(java.lang.String).

delta - the amount by which to increment the statistic value

Throws:

ArrayIndexOutOfBoundsException - If the id is invalid.

incLong

void incLong(StatisticDescriptor descriptor,
             long delta)

Increments the value of the described statistic of type long by the given amount.

Parameters:

descriptor - the descriptor for the statistic to increment

delta - the amount by which to increment the statistic value

Throws:

IllegalArgumentException - If no statistic exists with the given descriptor or if the described statistic is not of type long.

incLong

void incLong(String name,
             long delta)

Increments the value of the statistic of type long with the given name by a given amount.

Parameters:

name - the name of the statistic to increment

delta - the amount by which to increment the statistic value

Throws:

IllegalArgumentException - If no statistic exists with name name or if the statistic named name is not of type long.

incDouble

void incDouble(int id,
               double delta)

Increments the value of the identified statistic of type double by the given amount.

Parameters:

id - a statistic id obtained with nameToId(java.lang.String) or StatisticsType.nameToId(java.lang.String).

delta - the amount by which to increment the statistic value

Throws:

ArrayIndexOutOfBoundsException - If the id is invalid.

incDouble

void incDouble(StatisticDescriptor descriptor,
               double delta)

Increments the value of the described statistic of type double by the given amount.

Parameters:

descriptor - the descriptor for the statistic to increment

delta - the amount by which to increment the statistic value

Throws:

IllegalArgumentException - If no statistic exists with the given descriptor or if the described statistic is not of type double.

incDouble

void incDouble(String name,
               double delta)

Increments the value of the statistic of type double with the given name by a given amount.

Parameters:

name - the name of the statistic to increment

delta - the amount by which to increment the statistic value

Throws:

IllegalArgumentException - If no statistic exists with name name or if the statistic named name is not of type double.

setIntSupplier

@Deprecated
IntSupplier setIntSupplier(int id,
                                       IntSupplier supplier)

Deprecated. as of Geode 1.10, use setLongSupplier(int, LongSupplier) instead

Provide a callback to compute the value of this statistic every sample interval and use that as the value of the stat.

The callback should return quickly because it is invoked on a shared thread. It should not do any expensive computations, network calls, or access any resources under locks that may be locked by long running processes.

This callback will only be invoked if the distributed system property statistic-sampling-enabled is set to true, and it will be invoked at intervals determined by the statistic-sampling-rate.

Get methods are not guaranteed to recompute a new value, they may return the last sampled value

Parameters:

id - a statistic id obtained with nameToId(java.lang.String) or StatisticsType.nameToId(java.lang.String).

supplier - a callback that will return the value of the stat. This replaces any previously registered supplier. If the passed in supplier is null, it will remove any existing supplier

Returns:

the previously registered supplier, or null if there was no previously registered supplier

Throws:

IllegalArgumentException - If the id is invalid.

Since:

Geode 1.0

setIntSupplier

@Deprecated
IntSupplier setIntSupplier(String name,
                                       IntSupplier supplier)

Deprecated. as of Geode 1.10, use setLongSupplier(String, LongSupplier) instead

Provide a callback to compute the value of this statistic every sample interval and use that as the value of the stat.

The callback should return quickly because it is invoked on a shared thread. It should not do any expensive computations, network calls, or access any resources under locks that may be locked by long running processes.

This callback will only be invoked if the distributed system property statistic-sampling-enabled is set to true, and it will be invoked at intervals determined by the statistic-sampling-rate.

Get methods are not guaranteed to recompute a new value, they may return the last sampled value

Parameters:

name - the name of the statistic to update

supplier - a callback that will return the value of the stat. This replaces any previously registered supplier. If the passed in supplier is null, it will remove any existing supplier

Returns:

the previously registered supplier, or null if there was no previously registered supplier

Throws:

IllegalArgumentException - If no statistic exists with name name or if the statistic named name is not of type int.

Since:

Geode 1.0

setIntSupplier

@Deprecated
IntSupplier setIntSupplier(StatisticDescriptor descriptor,
                                       IntSupplier supplier)

Deprecated. as of Geode 1.10, use setLongSupplier(StatisticDescriptor, LongSupplier) instead

Provide a callback to compute the value of this statistic every sample interval and use that as the value of the stat.

The callback should return quickly because it is invoked on a shared thread. It should not do any expensive computations, network calls, or access any resources under locks that may be locked by long running processes.

This callback will only be invoked if the distributed system property statistic-sampling-enabled is set to true, and it will be invoked at intervals determined by the statistic-sampling-rate.

Get methods are not guaranteed to recompute a new value, they may return the last sampled value

Parameters:

descriptor - the descriptor of the statistic to update

supplier - a callback that will return the value of the stat. This replaces any previously registered supplier. If the passed in supplier is null, it will remove any existing supplier

Returns:

the previously registered supplier, or null if there was no previously registered supplier

Throws:

IllegalArgumentException - If no statistic exists with the given descriptor or if the described statistic is not of type int.

Since:

Geode 1.0

setLongSupplier

LongSupplier setLongSupplier(int id,
                             LongSupplier supplier)

Provide a callback to compute the value of this statistic every sample interval and use that as the value of the stat.

The callback should return quickly because it is invoked on a shared thread. It should not do any expensive computations, network calls, or access any resources under locks that may be locked by long running processes.

This callback will only be invoked if the distributed system property statistic-sampling-enabled is set to true, and it will be invoked at intervals determined by the statistic-sampling-rate.

Get methods are not guaranteed to recompute a new value, they may return the last sampled value

Parameters:

id - a statistic id obtained with nameToId(java.lang.String) or StatisticsType.nameToId(java.lang.String).

supplier - a callback that will return the value of the stat. This replaces any previously registered supplier. If the passed in supplier is null, it will remove any existing supplier

Returns:

the previously registered supplier, or null if there was no previously registered supplier

Throws:

IllegalArgumentException - If the id is invalid.

Since:

Geode 1.0

setLongSupplier

LongSupplier setLongSupplier(String name,
                             LongSupplier supplier)

Provide a callback to compute the value of this statistic every sample interval and use that as the value of the stat.

The callback should return quickly because it is invoked on a shared thread. It should not do any expensive computations, network calls, or access any resources under locks that may be locked by long running processes.

This callback will only be invoked if the distributed system property statistic-sampling-enabled is set to true, and it will be invoked at intervals determined by the statistic-sampling-rate.

Get methods are not guaranteed to recompute a new value, they may return the last sampled value

Parameters:

name - the name of the statistic to update

supplier - a callback that will return the value of the stat. This replaces any previously registered supplier. If the passed in supplier is null, it will remove any existing supplier

Returns:

the previously registered supplier, or null if there was no previously registered supplier

Throws:

IllegalArgumentException - If no statistic exists with name name or if the statistic named name is not of type long.

setLongSupplier

LongSupplier setLongSupplier(StatisticDescriptor descriptor,
                             LongSupplier supplier)

Provide a callback to compute the value of this statistic every sample interval and use that as the value of the stat.

The callback should return quickly because it is invoked on a shared thread. It should not do any expensive computations, network calls, or access any resources under locks that may be locked by long running processes.

This callback will only be invoked if the distributed system property statistic-sampling-enabled is set to true, and it will be invoked at intervals determined by the statistic-sampling-rate.

Get methods are not guaranteed to recompute a new value, they may return the last sampled value

Parameters:

descriptor - the descriptor of the statistic to update

supplier - a callback that will return the value of the stat. This replaces any previously registered supplier. If the passed in supplier is null, it will remove any existing supplier

Returns:

the previously registered supplier, or null if there was no previously registered supplier

Throws:

IllegalArgumentException - If no statistic exists with the given descriptor or if the described statistic is not of type long.

Since:

Geode 1.0

setDoubleSupplier

DoubleSupplier setDoubleSupplier(int id,
                                 DoubleSupplier supplier)

Provide a callback to compute the value of this statistic every sample interval and use that as the value of the stat.

The callback should return quickly because it is invoked on a shared thread. It should not do any expensive computations, network calls, or access any resources under locks that may be locked by double running processes.

This callback will only be invoked if the distributed system property statistic-sampling-enabled is set to true, and it will be invoked at intervals determined by the statistic-sampling-rate.

Get methods are not guaranteed to recompute a new value, they may return the last sampled value

Parameters:

id - a statistic id obtained with nameToId(java.lang.String) or StatisticsType.nameToId(java.lang.String).

supplier - a callback that will return the value of the stat. This replaces any previously registered supplier. If the passed in supplier is null, it will remove any existing supplier

Returns:

the previously registered supplier, or null if there was no previously registered supplier

Throws:

IllegalArgumentException - If the id is invalid.

Since:

Geode 1.0

setDoubleSupplier

DoubleSupplier setDoubleSupplier(String name,
                                 DoubleSupplier supplier)

Provide a callback to compute the value of this statistic every sample interval and use that as the value of the stat.

The callback should return quickly because it is invoked on a shared thread. It should not do any expensive computations, network calls, or access any resources under locks that may be locked by double running processes.

This callback will only be invoked if the distributed system property statistic-sampling-enabled is set to true, and it will be invoked at intervals determined by the statistic-sampling-rate.

Get methods are not guaranteed to recompute a new value, they may return the last sampled value

Parameters:

name - the name of the statistic to update

supplier - a callback that will return the value of the stat. This replaces any previously registered supplier. If the passed in supplier is null, it will remove any existing supplier

Returns:

the previously registered supplier, or null if there was no previously registered supplier

Throws:

IllegalArgumentException - If no statistic exists with name name or if the statistic named name is not of type double.

Since:

Geode 1.0

setDoubleSupplier

DoubleSupplier setDoubleSupplier(StatisticDescriptor descriptor,
                                 DoubleSupplier supplier)

Provide a callback to compute the value of this statistic every sample interval and use that as the value of the stat.

The callback should return quickly because it is invoked on a shared thread. It should not do any expensive computations, network calls, or access any resources under locks that may be locked by double running processes.

This callback will only be invoked if the distributed system property statistic-sampling-enabled is set to true, and it will be invoked at intervals determined by the statistic-sampling-rate.

Get methods are not guaranteed to recompute a new value, they may return the last sampled value

Parameters:

descriptor - the descriptor of the statistic to update

supplier - a callback that will return the value of the stat. This replaces any previously registered supplier. If the passed in supplier is null, it will remove any existing supplier

Returns:

the previously registered supplier, or null if there was no previously registered supplier

Throws:

IllegalArgumentException - If no statistic exists with the given descriptor or if the described statistic is not of type double.

Since:

Geode 1.0