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java.lang.Objectorg.apache.jcs.engine.memory.AbstractMemoryCache
org.apache.jcs.engine.memory.lru.LRUMemoryCache
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 efficeint 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
Nested Class Summary | |
class |
LRUMemoryCache.IteratorWrapper
|
class |
LRUMemoryCache.MapEntryWrapper
|
Field Summary |
Fields inherited from class org.apache.jcs.engine.memory.AbstractMemoryCache |
attr, cache, cacheName, cattr, chunkSize, map, status |
Constructor Summary | |
LRUMemoryCache()
|
Method Summary | |
void |
dumpCacheEntries()
Dump the cache entries from first to list for debugging. |
void |
dumpMap()
Dump the cache map for debugging. |
ICacheElement |
get(java.io.Serializable key)
Get an item from the cache |
java.util.Iterator |
getIterator()
Gets the iterator attribute of the LRUMemoryCache object |
java.lang.Object[] |
getKeyArray()
Get an Array of the keys for all elements in the memory cache |
ICacheElement |
getQuiet(java.io.Serializable key)
Get an item from the cache without affecting its last access time or position. |
IStats |
getStatistics()
Returns the historical and statistical data for a region's memory cache. |
void |
initialize(CompositeCache hub)
For post reflection creation initialization |
boolean |
remove(java.io.Serializable key)
Removes an item from the cache. |
void |
removeAll()
Remove all of the elements from both the Map and the linked list implementation. |
void |
update(ICacheElement ce)
Puts an item to the cache. |
Methods inherited from class org.apache.jcs.engine.memory.AbstractMemoryCache |
dispose, getCacheAttributes, getCacheName, getCompositeCache, getGroupKeys, getSize, getStatus, setCacheAttributes, waterfal |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
public LRUMemoryCache()
Method Detail |
public void initialize(CompositeCache hub)
initialize
in interface MemoryCache
initialize
in class AbstractMemoryCache
hub
- public void update(ICacheElement ce) throws java.io.IOException
update
in interface MemoryCache
update
in class AbstractMemoryCache
ce
- Description of the Parameter
java.io.IOException
public ICacheElement getQuiet(java.io.Serializable key) throws java.io.IOException
getQuiet
in interface MemoryCache
getQuiet
in class AbstractMemoryCache
key
- Identifies item to find
java.io.IOException
public ICacheElement get(java.io.Serializable key) throws java.io.IOException
get
in interface MemoryCache
get
in class AbstractMemoryCache
key
- Identifies item to find
java.io.IOException
public boolean remove(java.io.Serializable key) throws java.io.IOException
remove
in interface MemoryCache
remove
in class AbstractMemoryCache
key
-
java.io.IOException
public void removeAll() throws java.io.IOException
removeAll
in interface MemoryCache
removeAll
in class AbstractMemoryCache
java.io.IOException
public java.util.Iterator getIterator()
getIterator
in interface MemoryCache
getIterator
in class AbstractMemoryCache
public java.lang.Object[] getKeyArray()
getKeyArray
in interface MemoryCache
getKeyArray
in class AbstractMemoryCache
public void dumpMap()
public void dumpCacheEntries()
public IStats getStatistics()
MemoryCache
getStatistics
in interface MemoryCache
getStatistics
in class AbstractMemoryCache
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