Persistent hash-map, concurrent JDBM

Question

I tested JDBM2 which is really a great API to persist data directly in a tree- or hash-map. On the project site it is written that it does not support concurrent access. So my question is: Are there similar open source APIs for Java available which support concurrent read and write operations?

Thanks

score 1 · Accepted Answer · edited May 23 '17 at 12:04

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I guess a basic feature the questions implies is inter-jvm communication? If that is the case, I have successfully used hazelcast.

See for example this question that although different has valuable information.

edited May 23 '17 at 12:04

Community

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answered May 11 '11 at 19:25

Persimmonium

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score 0 · Answer 2 · answered May 11 '11 at 16:28

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Java has a way of wrapping an existent hash map and returning a synchronized map; however you will have to write the synchronization yourself: Collections#synchronizedMap

It is quite easy to extend an HashMap or implement the Map interface to enforce some synchronization on get() and put(), however iterators are more tricky.

There's also a ConcurrentHashMap but it has some limitations, depending on what you want to do.

The simple approach is to use Collections#synchronizedMap and add the synchronization code yourself.

answered May 11 '11 at 16:28

Miguel Ping

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synchronization does not support concurrent access, it serializes access. – Jed Wesley-Smith May 12 '11 at 00:57
I think that is what the op wanted. – Miguel Ping May 12 '11 at 09:29

Persistent hash-map, concurrent JDBM

2 Answers2