private CacheElement put(long address) throws IOException {
/** get a CacheElement from the stack object pool */
CacheElement c = map.pop();
/** read the element from the device */
c.read(address);
/** and insert the element into the LinkedHashMap */
map.put(c);
/**
* stack "must" contains at least one entry the placeholder ... so let it throw an exception if
* this is false
*/
CacheElement e = map.peek();
// if an element was discarded from the LRU cache
// now we can free it ... this will send the element
// to storage if is marked as dirty
if (!e.isFree()) e.free();
return c;
}
