org.exolab.castor.persist
Class LRU
java.lang.Object
org.exolab.castor.persist.LRU
public abstract class LRU
extends java.lang.Object
Base interface for all least-recently-used cache.
static class | LRU.CountLimited - CountLimited is a count limted least-recently-used Map.
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static class | LRU.NoCache - NoCache is a Map which dispose all object right the way.
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static class | LRU.TimeLimited - TimeLimited is a time limted least-recently-used Map.
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static class | LRU.Unlimited - UnLimited is Map which implements the
LRU interface.
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static int | CACHE_COUNT_LIMITED - Map type of Count-Limited least-recently-used as caching mechanism.
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static int | CACHE_NONE - Map type for no caching as the caching mechanism.
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static int | CACHE_TIME_LIMITED - Map type of Time-Limited least-recently-used is used as caching mechanism.
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static int | CACHE_UNLIMITED - Map type of unlimited cache as caching mechanism.
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static int | DEFAULT_PARAM - Specify the default LRU parameter
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static int | DEFAULT_TYPE - Specify the default LRU mechanism
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static LRU | create(int type, int param) - Factory method to create a LRU map of specified type.
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abstract Enumeration | elements() - Returns an enumeration of the values in this LRU map.
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abstract Object | get(Object key) - Returns the value to which the specified key is mapped in this hashtable.
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static int | mapType(String type) - Map the type in String into an int to represent
the lru cache type.
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abstract Object | put(Object key, Object value) - Maps the specified
key to the specified
value in this hashtable.
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abstract Object | remove(Object key) - Removes the key (and its corresponding value) from this
hashtable.
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CACHE_COUNT_LIMITED
public static final int CACHE_COUNT_LIMITED
Map type of Count-Limited least-recently-used as caching mechanism.
Object Lock which is not hold by any transcation will be put in the cache, until
the cache is full and other object overwritten it.
CACHE_NONE
public static final int CACHE_NONE
Map type for no caching as the caching mechanism. All object
put into the map will be discarded.
CACHE_TIME_LIMITED
public static final int CACHE_TIME_LIMITED
Map type of Time-Limited least-recently-used is used as caching mechanism.
Object Lock which is not hold by any transcation will be put in the cache, until
timeout is reached.
CACHE_UNLIMITED
public static final int CACHE_UNLIMITED
Map type of unlimited cache as caching mechanism.
Object Lock which is not hold by any transcation will be put in the cache
for later use.
DEFAULT_PARAM
public static final int DEFAULT_PARAM
Specify the default LRU parameter
DEFAULT_TYPE
public static final int DEFAULT_TYPE
Specify the default LRU mechanism
create
public static LRU create(int type,
int param)
Factory method to create a LRU map of specified type.
type
- mechanism typeparam
- capacity of the lru
elements
public abstract Enumeration elements()
Returns an enumeration of the values in this LRU map.
Use the Enumeration methods on the returned object to fetch the elements
sequentially.
- an enumeration of the values in this hashtable.
get
public abstract Object get(Object key)
Returns the value to which the specified key is mapped in this hashtable.
key
- - a key in the hashtable.
- the value to which the key is mapped in this hashtable; null if
the key is not mapped to any value in this hashtable.
mapType
public static int mapType(String type)
Map the type in String into an int to represent
the lru cache type.
put
public abstract Object put(Object key,
Object value)
Maps the specified
key
to the specified
value
in this hashtable. Neither the key nor the
value can be
null
.
The value can be retrieved by calling the
get
method
with a key that is equal to the original key, before it is diposed
by the least-recently-used map.
key
- the hashtable key.value
- the value.
- the previous value of the specified key in this hashtable,
or
null
if it did not have one.
remove
public abstract Object remove(Object key)
Removes the key (and its corresponding value) from this
hashtable. This method does nothing if the key is not in the hashtable.
key
- the key that needs to be removed.
- the value to which the key had been mapped in this hashtable,
or
null
if the key did not have a mapping.
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