MetricReader

java.lang.Object
- io.opencensus.exporter.metrics.util.MetricReader

```
public class MetricReader
extends java.lang.Object
```
Helper class to read all available Metrics from a MetricProducerManager and exports them to a MetricExporter.

Since:

0.19

Nested Class Summary

Nested Classes
Modifier and Type Class Description

static class MetricReader.Options
Options for MetricReader.

Field Summary

Fields
Modifier and Type	Field	Description
`(package private) static java.lang.String`	`DEFAULT_SPAN_NAME`
`private static java.util.logging.Logger`	`logger`
`private MetricProducerManager`	`metricProducerManager`
`private static Sampler`	`probabilitySampler`
`private java.lang.String`	`spanName`
`private static Tracer`	`tracer`

Constructor Summary

Constructors
Modifier Constructor Description

private MetricReader(MetricProducerManager metricProducerManager, java.lang.String spanName)

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`static MetricReader`	`create(MetricReader.Options options)`	Creates a new `MetricReader`.
`private static java.lang.String`	`exceptionMessage(java.lang.Throwable e)`
`void`	`readAndExport(MetricExporter metricExporter)`	Reads the metrics from the `MetricProducerManager` and exports them to the `metricExporter`.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

tracer
```
private static final Tracer tracer
```

logger

private static final java.util.logging.Logger logger

probabilitySampler

private static final Sampler probabilitySampler

DEFAULT_SPAN_NAME

static final java.lang.String DEFAULT_SPAN_NAME

See Also:: Constant Field Values

metricProducerManager

private final MetricProducerManager metricProducerManager

spanName

private final java.lang.String spanName

Constructor Detail

MetricReader

private MetricReader(MetricProducerManager metricProducerManager,
                     java.lang.String spanName)

Method Detail
- create
```
public static MetricReader create(MetricReader.Options options)
```
  Creates a new MetricReader.
  
  Parameters:
  
  options - the options for MetricReader.
  
  Returns:
  
  a new MetricReader.
  
  Since:
  
  0.19
- readAndExport
```
public void readAndExport(MetricExporter metricExporter)
```
  Reads the metrics from the MetricProducerManager and exports them to the metricExporter.
  
  Parameters:
  
  metricExporter - the exporter called to export the metrics read.
  
  Since:
  
  0.19
- exceptionMessage
```
private static java.lang.String exceptionMessage(java.lang.Throwable e)
```