Cache (instrumentation-api 1.12.0-alpha 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
`static <K,V> Cache<K,V>`	`bounded(int capacity)`	Returns new bounded cache.
`V`	`computeIfAbsent(K key, Function<? super K,? extends V> mappingFunction)`	Returns the cached value associated with the provided `key`.
`V`	`get(K key)`	Returns the cached value associated with the provided `key` if present, or `null` otherwise.
`void`	`put(K key, V value)`	Puts the `value` into the cache for the `key`.
`void`	`remove(K key)`	Removes a value for `key` if present.
`static <K,V> Cache<K,V>`	`weak()`	Returns new unbounded cache

- Method Detail
  - weak
```
static <K,V> Cache<K,V> weak()
```
    Returns new unbounded cache
    Keys are referenced weakly and compared using identity comparison, not Object.equals(Object).
  - bounded
```
static <K,V> Cache<K,V> bounded(int capacity)
```
    Returns new bounded cache.
    Both keys and values are strongly referenced.
  - 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.
  - get
```
@Nullable
V get(K key)
```
    Returns the cached value associated with the provided key if present, or null otherwise.
  - put
```
void put(K key,
         V value)
```
    Puts the value into the cache for the key.
  - remove
```
void remove(K key)
```
    Removes a value for key if present.