ObservableDataProvider (OpenGamma Strata)

```
public interface ObservableDataProvider
```
A provider of observable market data.
This plugin point allows a market data supplier to be provided. Implementations might request data from an external data provider, such as Bloomberg or Reuters.

Method Summary

All Methods Static Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`static ObservableDataProvider`	`none()`	Obtains an instance that provides no market data.
`Map<ObservableId,Result<Double>>`	`provideObservableData(Set<? extends ObservableId> identifiers)`	Provides market data for the specified identifiers.

- Method Detail
  - none
```
static ObservableDataProvider none()
```
    Obtains an instance that provides no market data.
    When invoked, the provider will return a map where every requested identifier is a failure.
    
    Returns:
    
    a provider that returns failures if invoked
  - provideObservableData
```
Map<ObservableId,Result<Double>> provideObservableData(Set<? extends ObservableId> identifiers)
```
    Provides market data for the specified identifiers.
    The implementation will provide market data for each identifier. If market data cannot be obtained for an identifier, a failure will be returned. The returned map must contain one entry for each identifier that was requested.
    
    Parameters:
    
    identifiers - the market data identifiers to find
    
    Returns:
    
    the map of market data values, keyed by identifier