On Tue, Apr 4, 2017 at 3:44 PM, Katia Aresti <karesti@redhat.com> wrote:
Hi all,

As you probably know, Will and I are working on the vert-x infinispan integration [1], where the primary goal is to make infinispan the default cluster management of vert-x. (yeah!)
Vert-x needs support for an Async Multimap. Today's implementation is a wrapper on a normal Cache where only Cache Key's are used to implement the multi map [2].
This is not very efficient, so after trying some other alternative implementations [3] that don't fully work (injection not working), Will and I have come to the conclusion that it might be a good idea to start having our own native CacheMultimap. This first multimap won't support duplicate values on key's.


Sounds a great idea! This structure could be useful internally as well, for example in the Lucene directory, where we emulate a multimap using a DeltaAware Set in the value + IGNORE_RETURN_VALUE flag for better performance.
 

As a quick start, the smallest multimap we need should implement the following interface :
public interface CacheMultimap<K, V> {
   V put(K key, V value);

What would it return here?

Gustavo


   Collection<V> get(K key);

   boolean remove(K key, V value);
}
CacheMultimapImpl will be a wrapper on a normal Cache, similar to [3].

We could add a new method in EmbeddedCacheManager.java

<K, V> CacheMultimap<K, V> getCacheMultimap(String cacheName, boolean createIfAbsent);

Implementation will create a cache as always and return a new CacheMultimapImpl(cache). 


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