This is Sun Microsystems' reference implementation of the
interface. It provides a central location for images to cache computed tiles, and is used as the default tile cache mechanism when no other tile cache objects are specified.
In this implementation, the cache size is limited by the memory capacity, which may be set at construction time or using the
setMemoryCapacity(long) method. The tile capacity is not used. Different images may have very different tile sizes. Therefore, the memory usage for a specific tile capacity may vary greatly depends on the type of images involved. In fact, the tile capacity is rather meaningless.