org.tinygroup.jspengine.appserv.util.cache
类 MultiLruCache

java.lang.Object
  org.tinygroup.jspengine.appserv.util.cache.BaseCache
      org.tinygroup.jspengine.appserv.util.cache.MultiLruCache

所有已实现的接口：

Cache

直接已知子类：

BoundedMultiLruCache

public class MultiLruCache
extends BaseCache

MultiLruCache -- in-memory bounded LRU cache with multiple LRU lists Underlying Hashtable is made into logical segments, with each segment having its own LRU list.

嵌套类摘要

从类 org.tinygroup.jspengine.appserv.util.cache.BaseCache 继承的嵌套类/接口

BaseCache.CacheItem

字段摘要

static int	DEFAULT_HASHTABLE_SEGMENT_SIZE
protected int[]	listsLength
static int	LRU_HEAD
static int	LRU_TAIL

从类 org.tinygroup.jspengine.appserv.util.cache.BaseCache 继承的字段

_rb, bucketLocks, buckets, entryCount, listeners, maxBuckets, refreshFlags, threshold

构造方法摘要

MultiLruCache()

方法摘要

protected BaseCache.CacheItem	createItem(int hashCode, Object key, Object value, int size) create new item
Object	getStatByName(String key) get the desired statistic counter
Map	getStats() get the stats snapshot
protected void	handleOverflow() cache has reached threshold so trim its size. subclasses are expected to provide a robust cache replacement algorithm.
protected void	incrementTrimIndex()
void	init(int maxCapacity, Properties props) initialize the LRU cache
protected void	itemAccessed(BaseCache.CacheItem item) this item is accessed
protected BaseCache.CacheItem	itemAdded(BaseCache.CacheItem item) this item is just added to the cache
protected void	itemRefreshed(BaseCache.CacheItem item, int oldSize) item value has been refreshed
protected void	itemRemoved(BaseCache.CacheItem item) item value has been removed from the cache
protected BaseCache.CacheItem	trimLru(int segment) remove an lru item from one of the LRU lists

从类 org.tinygroup.jspengine.appserv.util.cache.BaseCache 继承的方法

_put, _remove, _removeItem, add, add, addCacheListener, clear, clearStats, contains, decrementEntryCount, destroy, elements, eq, get, get, getAll, getEntryCount, getIndex, getIndex, hash, incrementAddCount, incrementEntryCount, incrementHitCount, incrementMissCount, incrementOverflowCount, incrementRefreshCount, incrementRemovalCount, init, isEmpty, isThresholdReached, keys, loadValue, notifyRefresh, put, put, remove, remove, remove, removeAll, trimExpiredEntries, trimItem, values, waitRefresh

从类 java.lang.Object 继承的方法

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

字段详细信息

LRU_HEAD

public static final int LRU_HEAD

另请参见：

常量字段值

LRU_TAIL

public static final int LRU_TAIL

另请参见：

常量字段值

DEFAULT_HASHTABLE_SEGMENT_SIZE

public static final int DEFAULT_HASHTABLE_SEGMENT_SIZE

另请参见：

常量字段值

listsLength

protected int[] listsLength

构造方法详细信息

MultiLruCache

public MultiLruCache()

方法详细信息

init

public void init(int maxCapacity,
                 Properties props)
          throws Exception

initialize the LRU cache

指定者：

接口 Cache 中的 init

覆盖：

类 BaseCache 中的 init

参数：

maxCapacity - maximum number of entries this cache may hold

props - opaque list of properties for a given cache implementation

抛出：

Exception

createItem

protected BaseCache.CacheItem createItem(int hashCode,
                                         Object key,
                                         Object value,
                                         int size)

create new item

覆盖：

类 BaseCache 中的 createItem

参数：

hashCode - for the entry

key - Object key

value - Object value

size - size in bytes of the item subclasses may override to provide their own CacheItem extensions e.g. one that permits persistence.

trimLru

protected BaseCache.CacheItem trimLru(int segment)

remove an lru item from one of the LRU lists

参数：

the - LRU segment index to trim

返回：

the item that was successfully trimmed

itemAdded

protected BaseCache.CacheItem itemAdded(BaseCache.CacheItem item)

this item is just added to the cache

覆盖：

类 BaseCache 中的 itemAdded

参数：

item - CacheItem that was created

返回：

a overflow item; may be null Cache bucket is already synchronized by the caller

itemAccessed

protected void itemAccessed(BaseCache.CacheItem item)

this item is accessed

覆盖：

类 BaseCache 中的 itemAccessed

参数：

item - CacheItem accessed Cache bucket is already synchronized by the caller

itemRefreshed

protected void itemRefreshed(BaseCache.CacheItem item,
                             int oldSize)

item value has been refreshed

覆盖：

类 BaseCache 中的 itemRefreshed

参数：

item - CacheItem that was refreshed

oldSize - size of the previous value that was refreshed Cache bucket is already synchronized by the caller

itemRemoved

protected void itemRemoved(BaseCache.CacheItem item)

item value has been removed from the cache

覆盖：

类 BaseCache 中的 itemRemoved

参数：

item - CacheItem that was just removed Cache bucket is already synchronized by the caller

handleOverflow

protected void handleOverflow()

cache has reached threshold so trim its size. subclasses are expected to provide a robust cache replacement algorithm.

覆盖：

类 BaseCache 中的 handleOverflow

incrementTrimIndex

protected void incrementTrimIndex()

getStatByName

public Object getStatByName(String key)

get the desired statistic counter

指定者：

接口 Cache 中的 getStatByName

覆盖：

类 BaseCache 中的 getStatByName

参数：

key - to corresponding stat

返回：

an Object corresponding to the stat See also: Constant.java for the key

getStats

public Map getStats()

get the stats snapshot

指定者：

接口 Cache 中的 getStats

覆盖：

类 BaseCache 中的 getStats

返回：

a Map of stats See also: Constant.java for the keys