Looking for a lightweight java-compatible in-memory key-value store [closed]

Answer 1

Your question could mean one of two things.

If you mean a data structure for storing key-value pairs, use one of the Map instances that are a standard part of the JDK.

If however you are after an in-memory key-value store then I would suggest taking a look at EHCache or even memcached.

Answer 2

There are lightweigh or embedded dbs like HSQLDB, Derby, SQLite But like others don't understand why you need a db to store key/values...

Why not a Map? Need to keep key/values on app reboot?

Also it's perhaps not what you need but with html5 on up to date browsers you have localStorage that permits you to store key/values in the browser using javascript.

Answer 3

HashMap?

Answer 4

MapDb is an alternative to Berkley with a friendly Apache 2 license.

• Provides key-value store via java's Map interface
• Lightweight (300KB jar)
• Fast and threadsafe
• Persists changes to disk if you want to
• Many other features

Answer 5

I would recommend to try a Redisson. You will able to use distributed and scalable Map or ConcurrentMap and other (Set, List, Queue, Lock ...) implementations on top of high performance key-value Redis server.

Easy example:

Redisson redisson = Redisson.create();

ConcurrentMap<String, SomeObject> map = redisson.getMap("anyMap");

...

redisson.shutdown();

Answer 6

I know this is a two-year old post but I've been messing around with Infinispan recently and I like it so far. I'm not an expert by any means but it was not too difficult for me to set up a distributed cache with a few nodes and I was pulling some data from them in about an hour.