Package org.apache.jackrabbit.oak.segment

Interface Cache<K,V>

All Known Implementing Classes:

CacheAccessTracker, RecordCache

public interface Cache<K,V>

Partial mapping of keys of type K to values of type Cache. If supported by the underlying implementation the mappings can further be associated with a cost, which is a metric for the cost occurring when the given mapping is lost. Higher values represent higher costs.

Method Summary

Modifier and Type	Method	Description
V	get(K key)
void	put(K key, V value)	Add a mapping from key to value.
void	put(K key, V value, byte cost)	Add a mapping from key to value with a given cost.

Method Detail

put

void put(@NotNull
         K key,
         @NotNull
         V value)

Add a mapping from key to value.

Throws:

UnsupportedOperationException - if the underlying implementation doesn't support values without an associated cost and put(Object, Object, byte) should be used instead.

put

void put(@NotNull
         K key,
         @NotNull
         V value,
         byte cost)

Add a mapping from key to value with a given cost.

Throws:

UnsupportedOperationException - if the underlying implementation doesn't support values with an associated cost and put(Object, Object) should be used instead.

get

@Nullable
V get(@NotNull
      K key)

Returns:

The mapping for key, or null if none.