org.apache.jcs.engine.memory.lru
Class LRUMemoryCache
java.lang.Object
org.apache.jcs.engine.memory.AbstractMemoryCache
org.apache.jcs.engine.memory.AbstractDoulbeLinkedListMemoryCache
org.apache.jcs.engine.memory.lru.LRUMemoryCache
- All Implemented Interfaces:
- java.io.Serializable, IMemoryCache, MemoryCache
public class LRUMemoryCache
- extends AbstractDoulbeLinkedListMemoryCache
A fast reference management system. The least recently used items move to the end of the list and
get spooled to disk if the cache hub is configured to use a disk cache. Most of the cache
bottelnecks are in IO. There are no io bottlenecks here, it's all about processing power.
Even though there are only a few adjustments necessary to maintain the double linked list, we
might want to find a more efficient memory manager for large cache regions.
The LRUMemoryCache is most efficient when the first element is selected. The smaller the region,
the better the chance that this will be the case. < .04 ms per put, p3 866, 1/10 of that per get
- See Also:
- Serialized Form
Methods inherited from class org.apache.jcs.engine.memory.AbstractDoulbeLinkedListMemoryCache |
addFirst, addLast, createMap, dumpCacheEntries, dumpCacheSize, dumpMap, freeElements, get, getIterator, getKeyArray, getStatistics, initialize, remove, removeAll, spoolLastElement, update, verifyCache |
Methods inherited from class org.apache.jcs.engine.memory.AbstractMemoryCache |
dispose, getCacheAttributes, getCacheName, getCompositeCache, getGroupKeys, getMultiple, getQuiet, getSize, getStatus, setCacheAttributes, waterfal |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
LRUMemoryCache
public LRUMemoryCache()
adjustListForUpdate
protected MemoryElementDescriptor adjustListForUpdate(ICacheElement ce)
throws java.io.IOException
- Puts an item to the cache. Removes any pre-existing entries of the same key from the linked
list and adds this one first.
- Specified by:
adjustListForUpdate
in class AbstractDoulbeLinkedListMemoryCache
- Parameters:
ce
- The cache element, or entry wrapper
- Returns:
- MemoryElementDescriptor the new node
- Throws:
java.io.IOException
adjustListForGet
protected void adjustListForGet(MemoryElementDescriptor me)
- Makes the item the first in the list.
- Specified by:
adjustListForGet
in class AbstractDoulbeLinkedListMemoryCache
- Parameters:
me
-
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