Interface BasicMultimapCache<K,​V>

  • All Known Subinterfaces:
    MultimapCache<K,​V>, RemoteMultimapCache<K,​V>
    All Known Implementing Classes:
    EmbeddedMultimapCache

    @Experimental
    public interface BasicMultimapCache<K,​V>
    BasicMultimapCache provides the common API for the two different types of multimap caches that Infinispan provides: embedded and remote.

    Please see the Infinispan documentation and/or the 5 Minute Usage Tutorial for more details on Infinispan.

    MutimapCache is a type of Infinispan Cache that maps keys to values, similar to AsyncCache in which each key can contain multiple values.

        foo → 1
        bar → 3, 4, 5
     

    Example

    
        multimapCache.put("k", "v1").join();
        multimapCache.put("k", "v2").join();
        multimapCache.put("k", "v3").join();
    
        Collection results = multimapCache.get("k").join();
    
     

    Eviction

    Eviction works per key. This means all the values associated on a key will be evicted.

    Views

    The returned collections when calling "get" are views of the values on the key. Any change on these collections won't affect the cache values on the key.

    Null values

    Null values are not supported. The multimap cache won't have a null key or any null value.

    Example

         multimapCache.put(null, "v1").join() → fails
         multimapCache.put("k", null).join() → fails
         multimapCache.put("k", "v1").join() → works and add's v1
         multimapCache.containsKey("k").join() → true
         multimapCache.remove("k", "v1").join() → works, removes v1 and as the remaining collection is empty, the key is
     removed
         multimapCache.containsKey("k").join() → false
      

    Since:
    9.2
    Author:
    Katia Aresti, karesti@redhat.com
    See Also:
    Infinispan documentation
    • Method Detail

      • put

        CompletableFuture<Void> put​(K key,
                                    V value)
        Puts a key-value pair in this multimap cache.
        • If this multimap cache supports duplicates, the value will be always added.
        • If this multimap cache does not support duplicates and the value exists on the key, nothing will be done.
        Parameters:
        key - the key to be put
        value - the value to added
        Returns:
        CompletableFuture containing a Void
        Since:
        9.2
      • get

        CompletableFuture<Collection<V>> get​(K key)
        Returns a view collection of the values associated with key in this multimap cache, if any. Any changes to the retrieved collection won't change the values in this multimap cache. When this method returns an empty collection, it means the key was not found.
        Parameters:
        key - to be retrieved
        Returns:
        a CompletableFuture containing which is a view of the underlying values.
        Since:
        9.2
      • remove

        CompletableFuture<Boolean> remove​(K key,
                                          V value)
        Removes a key-value pair from this multimap cache, if such exists. Returns true when the key-value pair has been removed from the key.

        • In the case where duplicates are not supported, only one the key-value pair will be removed, if such exists.
        • In the case where duplicates are supported, all the key-value pairs will be removed.
        • If the values remaining after the remove call are empty, the whole entry will be removed.
        Parameters:
        key - key to be removed
        value - value to be removed
        Returns:
        CompletableFuture containing Boolean.TRUE if the key-value pair was removed, and Boolean.FALSE when the key-value pair was not removed
        Since:
        9.2
      • size

        CompletableFuture<Long> size()
        Returns the number of key-value pairs in this multimap cache. It doesn't return the distinct number of keys.

        This method is blocking in a explicit transaction context.

        The CompletableFuture is a

        Returns:
        CompletableFuture containing the size as Long
        Since:
        9.2
      • supportsDuplicates

        boolean supportsDuplicates()
        Multimap can support duplicates on the same key k → ['a', 'a', 'b'] or not k → ['a', 'b'] depending on configuration.

        Returns duplicates are supported or not in this multimap cache.

        Returns:
        true if this multimap supports duplicate values for a given key.
        Since:
        9.2