search by partial field of composite key

[sea_shankar]

I am just curious if there is an optimal way of searching for single field in a composite key.

If they key/value pair is ( [K1,K2], V1), ([K1,K3], V2) is there support to say find by K1 only? Only way I can think of right now is to get the full set of (Ks,Vs) and then do a filter? This would be pretty costly on large data sets.

[anistor]

Hi,

searching by key is not supported, and searching by a part of the key is not supported either. You can only retrieve entries by knowing the exact key. Or you can also search for values based on their fields.

A possible workaround for you is to put that part of the key in the value as a field and search for it.

Adrian

[sea_shankar]

Thanks, I decided to try and use the entrySet().stream to filter out key that contains the partial key.  however having trouble as it throws unsupported exception.

I have a RemoteCache<Object,Object> cache;

cache.put("hello","hello")

Tried the following:

Works:

cache.keySet().stream().filter(e -> e.toString().contains("hello")).forEach(e -> log.info(e.toString()));

Unsupported Exception:

cache.entrySet().stream().filter(e -> e.toString().contains("hello")).forEach(e -> log.info(e.toString()));

Get this exception: java.lang.UnsupportedOperationException: null

Any idea?

[rvansa]

Exceptions have stacktraces...

[sea_shankar]

Sorry for that, I was able to get an answer from another thread. Seems RemoteCache doesn't have entrySet() functionality.

https://developer.jboss.org/message/972865?et=watches.email.thread#972865