ilionsd / softmemory

2 lvl cache on Java (Potentially N level)

softmemory

This library is my solution of "Create 2 lvl cache" problem on Java 8.

A complete statement is

Create a configurable two-level cache (for caching Objects).   Level 1 is memory, level 2 is filesystem. Config params should let one specify the cache strategies and max sizes of level  1 and 2.

My solution is based on 3 abstractions:

• Memory<K, V> - simple associative container interface;
• Cache<K, V> - cache replacement policies over Memory<K, V> buffer;
• CachedMemory<K, V> - extended from Memory<K, V> cache writing policies over Memory<K, V> main memory and Cache<K, V> buffer.

This approach makes possible to create any depth-level cache by using object of CachedMemory as buffer for Cache. Possible 3 level case is:

1. In memory storage;
2. Filesystem storage;
3. Remote storage.

Finally, interface-based design makes library easily extensible for custom realization of replacement and writing policies.