org.exolab.castor.persist
Class LRU.TimeLimited
- LRU
public static class LRU.TimeLimited
TimeLimited is a time limted least-recently-used
Map.
Every object being put in the Map will live until the timeout
expired.
Method
dispose(Object)
will be called whenever an
old object is diposed. Developer can get notify by overriding
the dispose method
dispose(Object)
.
protected void | dispose(Object o) - This method is called when an object is disposed.
|
Enumeration | elements() - Returns an enumeration of the values in this LRU map.
|
Object | get(Object key) - Returns the value to which the specified key is mapped in this Map.
|
Object | put(Object key, Object value) - Maps the specified
key to the specified
value in this Map.
|
Object | remove(Object key) - Removes the key (and its corresponding value) from this
Map.
|
DEFAULT_PRECISION
public static final int DEFAULT_PRECISION
The Default precision in millisecond is 1000. Percision is the interval
between each time which the timer thread will wake up and trigger
clean up of least-recently-used Object.
TimeLimited
public TimeLimited(int interval)
Constructor
interval
- the number of ticks an object live before it is disposed.
dispose
protected void dispose(Object o)
This method is called when an object is disposed.
Override this method if you interested in the disposed object.
o
- - the disposed object
elements
public 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.
- elements in interface LRU
- an enumeration of the values in this Map.
get
public Object get(Object key)
Returns the value to which the specified key is mapped in this Map.
- get in interface LRU
key
- - a key in the Map.
- the value to which the key is mapped in this Map; null if
the key is not mapped to any value in this Map.
put
public Object put(Object key,
Object value)
Maps the specified
key
to the specified
value
in this Map. 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
when the timeout of the entry is expired.
- put in interface LRU
key
- the Map key.value
- the value.
- the previous value of the specified key in this Map,
or
null
if it did not have one.
remove
public Object remove(Object key)
Removes the key (and its corresponding value) from this
Map. This method does nothing if the key is not in the Map.
- remove in interface LRU
key
- the key that needs to be removed.
- the value to which the key had been mapped in this Map,
or
null
if the key did not have a mapping.
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