org.apache.hadoop.metrics2

Class MetricsJsonBuilder

java.lang.Object

org.apache.hadoop.metrics2.MetricsRecordBuilder

org.apache.hadoop.metrics2.MetricsJsonBuilder

@InterfaceAudience.Public
@InterfaceStability.Evolving
public class MetricsJsonBuilder
extends MetricsRecordBuilder

Build a JSON dump of the metrics. The toString() operator dumps out all values collected.

Field Summary

Fields

Modifier and Type	Field and Description
static org.slf4j.Logger	LOG

Constructor Summary

Constructors

Constructor and Description
MetricsJsonBuilder(MetricsCollector parent) Build an instance.

Method Summary

Methods

Modifier and Type	Method and Description
MetricsRecordBuilder	add(AbstractMetric metric) Add a pre-made immutable metric object
MetricsRecordBuilder	add(MetricsTag tag) Add an immutable metrics tag object
MetricsRecordBuilder	addCounter(MetricsInfo info, int value) Add an integer metric
MetricsRecordBuilder	addCounter(MetricsInfo info, long value) Add an long metric
MetricsRecordBuilder	addGauge(MetricsInfo info, double value) Add a double gauge metric
MetricsRecordBuilder	addGauge(MetricsInfo info, float value) Add a float gauge metric
MetricsRecordBuilder	addGauge(MetricsInfo info, int value) Add a integer gauge metric
MetricsRecordBuilder	addGauge(MetricsInfo info, long value) Add a long gauge metric
MetricsCollector	parent()
MetricsRecordBuilder	setContext(String value) Set the context tag
MetricsRecordBuilder	tag(MetricsInfo info, String value) Add a metrics tag
String	toString()

Methods inherited from class org.apache.hadoop.metrics2.MetricsRecordBuilder

endRecord

Methods inherited from class java.lang.Object

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

Field Detail

LOG

public static final org.slf4j.Logger LOG

Constructor Detail

MetricsJsonBuilder

public MetricsJsonBuilder(MetricsCollector parent)

Build an instance.

Parameters:

parent - parent collector. Unused in this instance; only used for the parent() method

Method Detail

tag

public MetricsRecordBuilder tag(MetricsInfo info,
                       String value)

Description copied from class: MetricsRecordBuilder

Add a metrics tag

Specified by:

tag in class MetricsRecordBuilder

Parameters:

info - metadata of the tag

value - of the tag

Returns:

self

add

public MetricsRecordBuilder add(MetricsTag tag)

Description copied from class: MetricsRecordBuilder

Add an immutable metrics tag object

Specified by:

add in class MetricsRecordBuilder

Parameters:

tag - a pre-made tag object (potentially save an object construction)

Returns:

self

add

public MetricsRecordBuilder add(AbstractMetric metric)

Description copied from class: MetricsRecordBuilder

Add a pre-made immutable metric object

Specified by:

add in class MetricsRecordBuilder

Parameters:

metric - the pre-made metric to save an object construction

Returns:

self

setContext

public MetricsRecordBuilder setContext(String value)

Description copied from class: MetricsRecordBuilder

Set the context tag

Specified by:

setContext in class MetricsRecordBuilder

Parameters:

value - of the context

Returns:

self

addCounter

public MetricsRecordBuilder addCounter(MetricsInfo info,
                              int value)

Description copied from class: MetricsRecordBuilder

Add an integer metric

Specified by:

addCounter in class MetricsRecordBuilder

Parameters:

info - metadata of the metric

value - of the metric

Returns:

self

addCounter

public MetricsRecordBuilder addCounter(MetricsInfo info,
                              long value)

Description copied from class: MetricsRecordBuilder

Add an long metric

Specified by:

addCounter in class MetricsRecordBuilder

Parameters:

info - metadata of the metric

value - of the metric

Returns:

self

addGauge

public MetricsRecordBuilder addGauge(MetricsInfo info,
                            int value)

Description copied from class: MetricsRecordBuilder

Add a integer gauge metric

Specified by:

addGauge in class MetricsRecordBuilder

Parameters:

info - metadata of the metric

value - of the metric

Returns:

self

addGauge

public MetricsRecordBuilder addGauge(MetricsInfo info,
                            long value)

Description copied from class: MetricsRecordBuilder

Add a long gauge metric

Specified by:

addGauge in class MetricsRecordBuilder

Parameters:

info - metadata of the metric

value - of the metric

Returns:

self

addGauge

public MetricsRecordBuilder addGauge(MetricsInfo info,
                            float value)

Description copied from class: MetricsRecordBuilder

Add a float gauge metric

Specified by:

addGauge in class MetricsRecordBuilder

Parameters:

info - metadata of the metric

value - of the metric

Returns:

self

addGauge

public MetricsRecordBuilder addGauge(MetricsInfo info,
                            double value)

Description copied from class: MetricsRecordBuilder

Add a double gauge metric

Specified by:

addGauge in class MetricsRecordBuilder

Parameters:

info - metadata of the metric

value - of the metric

Returns:

self

parent

public MetricsCollector parent()

Specified by:

parent in class MetricsRecordBuilder

Returns:

the parent metrics collector object

toString

public String toString()

Overrides:

toString in class Object