net.morimekta.providence.storage

Interface ReadOnlyStore<K,V>

Type Parameters:

K - Key to use for gathering information.

V - Value to fetch, that is a generic method.

All Known Subinterfaces:

MessageListReadOnlyStore<K,M,F>, MessageListStore<K,M,F>, MessageReadOnlyStore<K,M,F>, MessageSetStore<K,M,F>, MessageStore<K,M,F>, ReadWriteSetStore<K,V>, ReadWriteStore<K,V>

All Known Implementing Classes:

DirectoryMessageListStore, DirectoryMessageSetStore, DirectoryMessageStore, InMemoryMessageListStore, InMemoryMessageSetStore, InMemoryMessageStore

public interface ReadOnlyStore<K,V>

Interface to read a value or a range of values for a given key or keys.

Method Summary

Modifier and Type	Method and Description
boolean	containsKey(K key)
default V	get(K key) Get a single value from the storage.
Map<K,V>	getAll(Collection<K> keys) Look up a set of keys from the storage.
Collection<K>	keys() Get a collection of all the keys in the store.
default int	size()

Method Detail

getAll

@Nonnull
Map<K,V> getAll(@Nonnull
                         Collection<K> keys)

Look up a set of keys from the storage.

Parameters:

keys - The keys to look up.

Returns:

Map of all the found key value pairs. Values not found should not have an entry in the result map (no key -> null mapping).

containsKey

boolean containsKey(@Nonnull
                    K key)

Parameters:

key - The key to look up.

Returns:

True if the key was contained in the map.

keys

@Nonnull
Collection<K> keys()

Get a collection of all the keys in the store.

Returns:

Key collection.

get

@Nullable
default V get(@Nonnull
                        K key)

Get a single value from the storage.

Parameters:

key - The key to look up.

Returns:

The value if present.

size

default int size()

Returns:

Get the total number of entries in the store, same as the number of unique keys.