I had a wrapper as well, unfortunately the source is closed in this case. But it wasn't a generic wrapper like yours. Basically it had a put operation that co

I had a wrapper as well, unfortunately the source is closed in this case. But it wasn't a generic wrapper like yours. Basically it had a put operation that could take a huge sequence of data and persist all of them. The get operation would also "get" a list of 100 objects at a time. I used tokyo cabinet as a persistent cache basically. I used java's concurrent queues to store keys for thread safe atomic "gets".