[infinispan-dev] Native Infinispan Multimap support

[Thomas SEGISMONT]

Hi Katia,

2017-04-04 16:44 GMT+02:00 Katia Aresti <karesti at redhat.com>:

> 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!)
>

This can't be the primary goal. Making it the best cluster manager would be
great though!


> 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.
>
> 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);
>
>    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).
>
> What do you think ? Please fell free to suggest any other alternative or
> idea.
>

One thing we need in vertx-infinispan is the ability to clean the multimap,
meaning removing some key/value pairs if value matches criteria.

It doesn't seem possible with this interface. At least, it misses a method
to get all the keys from this multimap. Ideally, I would like to be able to
supply a Serializable Predicate.


>
> Cheers
>
> Katia
>


Thank you for looking into this!


>
> [1] https://github.com/vert-x3/vertx-infinispan
>
> [2] https://github.com/vert-x3/vertx-infinispan/blob/master/
> src/main/java/io/vertx/ext/cluster/infinispan/impl/
> InfinispanAsyncMultiMap.java
>
> [3] https://gist.github.com/karesti/194bb998856d4a2828d83754130ed79c
>
>
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