/**
* Reduces the number of rows held in this Cache object.
*
* <p>Cleanup is done by checking the accessCount of the Rows and removing the rows with the
* lowest access count.
*
* <p>Index operations require that up to 5 recently accessed rows remain in the cache.
*/
private synchronized void cleanUp() throws IOException {
int removeCount = cacheMap.size() / 2;
int accessTarget = cacheMap.getAccessCountCeiling(removeCount, removeCount / 8);
ObjectCacheHashMap.ObjectCacheIterator it = cacheMap.iterator();
int savecount = 0;
for (; it.hasNext(); ) {
CachedObject r = (CachedObject) it.next();
if (it.getAccessCount() <= accessTarget) {
if (!r.isKeepInMemory()) {
if (r.hasChanged()) {
rowTable[savecount++] = r;
}
it.remove();
cacheBytesLength -= r.getStorageSize();
}
}
}
cacheMap.setAccessCountFloor(accessTarget);
saveRows(savecount);
}
/** Adds a row to the cache. */
public synchronized void put(int key, CachedObject row) throws IOException {
int storageSize = row.getStorageSize();
if (cacheMap.size() >= capacity || storageSize + cacheBytesLength > bytesCapacity) {
cleanUp();
}
cacheMap.put(key, row);
cacheBytesLength += storageSize;
}
public int size() {
return cacheMap.size();
}