DefaultAggregationSelector

All Known Subinterfaces:

MetricExporter, MetricReader

All Known Implementing Classes:

OtlpGrpcMetricExporter, OtlpHttpMetricExporter, PeriodicMetricReader

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
```
@FunctionalInterface
public interface DefaultAggregationSelector
```
A functional interface that selects default Aggregation based on InstrumentType.

Since:

1.16.0

Method Summary

All Methods Static Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method	Description
`static java.lang.String`	`asString(DefaultAggregationSelector selector)`	Returns a string representation of this selector, for using in `Object.toString()` implementations.
`static DefaultAggregationSelector`	`getDefault()`	The default implementation of `DefaultAggregationSelector` which returns the default aggregation for each instrument.
`Aggregation`	`getDefaultAggregation(InstrumentType instrumentType)`	Return the default aggregation for the `InstrumentType`.
`default DefaultAggregationSelector`	`with(InstrumentType instrumentType, Aggregation aggregation)`	Returns a default aggregation selector which returns the given `aggregation` for the given `instrumentType`, and defers to this for other instrument types.

- Method Detail
  - getDefault
```
static DefaultAggregationSelector getDefault()
```
    The default implementation of DefaultAggregationSelector which returns the default aggregation for each instrument.
  - with
```
default DefaultAggregationSelector with(InstrumentType instrumentType,
                                        Aggregation aggregation)
```
    Returns a default aggregation selector which returns the given aggregation for the given instrumentType, and defers to this for other instrument types.
    For example, the following produces a selector which drops histograms and uses the default aggregation for other instruments:
    // DefaultAggregationSelector selector = // DefaultAggregationSelector.getDefault() // .with(InstrumentType.HISTOGRAM, Aggregation.drop());
    Since:
    
    1.16.0
  - getDefaultAggregation
```
Aggregation getDefaultAggregation(InstrumentType instrumentType)
```
    Return the default aggregation for the InstrumentType.
    The default aggregation is used when an instrument does not match any views.
  - asString
```
static java.lang.String asString(DefaultAggregationSelector selector)
```
    Returns a string representation of this selector, for using in Object.toString() implementations.
    
    Since:
    
    1.38.0