CacheFunction (infrautils 1.7.4-SNAPSHOT API)

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 CacheFunction<K,V>
```
Cache's Function.
Use this if your implementation throws no exception (i.e. only unchecked runtime exceptions). If your cache function throws checked exceptions, then just use a CheckedCacheFunction instead.

Author:

Michael Vorburger.ch

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method	Description
`default CacheFunction<K,V>`	`from(Function<K,V> function)`	Convenience mapping from java.util.function.Function.
`@NonNull V`	`get(@NonNull K key)`	Calculate the value of the cache entry for the given key.
`default com.google.common.collect.ImmutableMap<K,V>`	`get(Iterable<? extends K> keys)`	Implementations may wish to override this implementation if they can provide bulk implementations which avoid 1-by-1 locking overhead which single get() may incur, which is what the default implementation does.

- Method Detail
  - get
```
@NonNull V get(@NonNull K key)
```
    Calculate the value of the cache entry for the given key.
    
    Parameters:
    
    key - the key for which to "calculate" (lookup, remote call, ...) a value.
    
    Returns:
    
    value for the given key
  - get
```
default com.google.common.collect.ImmutableMap<K,V> get(Iterable<? extends K> keys)
```
    Implementations may wish to override this implementation if they can provide bulk implementations which avoid 1-by-1 locking overhead which single get() may incur, which is what the default implementation does.
    
    Parameters:
    
    keys - list of keys of cache entries
    
    Returns:
    
    Map of cache keys and values (neither ever null, but may be an Optional)
  - from
```
default CacheFunction<K,V> from(Function<K,V> function)
```
    Convenience mapping from java.util.function.Function. Typically never overridden.