org.apache.beam.fn.harness

Class Caches.ClearableCache<K,V>

java.lang.Object

org.apache.beam.fn.harness.Caches.ClearableCache<K,V>

All Implemented Interfaces:

Cache<K,V>

Enclosing class:

Caches

public static class Caches.ClearableCache<K,V>
extends java.lang.Object

A cache that tracks keys that have been inserted into the cache and supports clearing them.

The set of keys that are tracked are only those provided to peek(K) and computeIfAbsent(K, java.util.function.Function<K, V>).

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.beam.fn.harness.Cache

Cache.Shrinkable<V>

Constructor Summary

Constructors

Constructor and Description
ClearableCache(Cache<K,V> cache)

Method Summary

Modifier and Type	Method and Description
void	clear() Removes all tracked keys from the cache.
V	computeIfAbsent(K key, java.util.function.Function<K,V> loadingFunction) Looks up the specified key and returns the associated value.
void	put(K key, V value) Inserts a new value associated with the given key or updates an existing association of the same key with the new value.
void	remove(K key) Removes the mapping for a key from the cache if it is present.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ClearableCache

public ClearableCache(Cache<K,V> cache)

Method Detail

computeIfAbsent

public V computeIfAbsent(K key,
                         java.util.function.Function<K,V> loadingFunction)

Description copied from interface: Cache

Looks up the specified key and returns the associated value.

If the key is not present in the cache, the specified function will be used to load and populate the cache.

Specified by:

computeIfAbsent in interface Cache<K,V>

put

public void put(K key,
                V value)

Description copied from interface: Cache

Inserts a new value associated with the given key or updates an existing association of the same key with the new value.

Specified by:

put in interface Cache<K,V>

remove

public void remove(K key)

Description copied from interface: Cache

Removes the mapping for a key from the cache if it is present.

Specified by:

remove in interface Cache<K,V>

clear

public void clear()

Removes all tracked keys from the cache.