Cache (instrumentation-api-caching 1.0.0 API)

```
public interface Cache<K,V>
```
A cache from keys to values.

Method Summary

All Methods Static Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`V`	`computeIfAbsent(K key, Function<? super K,? extends V> mappingFunction)`	Returns the cached value associated with the provided `key`.
`static CacheBuilder`	`newBuilder()`	Returns a new `CacheBuilder` to configure a `Cache`.

- Method Detail
  - newBuilder
```
static CacheBuilder newBuilder()
```
    Returns a new CacheBuilder to configure a Cache.
  - computeIfAbsent
```
V computeIfAbsent(K key,
                  Function<? super K,? extends V> mappingFunction)
```
    Returns the cached value associated with the provided key. If no value is cached yet, computes the value using mappingFunction, stores the result, and returns it.