public class LRUCachePolicy extends Object implements CachePolicy
Modifier and Type | Class and Description |
---|---|
class |
LRUCachePolicy.LRUCacheEntry
Double linked cell used as entry in the cache list.
|
class |
LRUCachePolicy.LRUList
Double queued list used to store cache entries.
|
Modifier and Type | Field and Description |
---|---|
protected LRUCachePolicy.LRUList |
m_list
The linked list used to implement the LRU algorithm
|
protected Map |
m_map
The map holding the cached objects
|
protected int |
m_maxCapacity
The maximum capacity of this cache
|
protected int |
m_minCapacity
The minimum capacity of this cache
|
Constructor and Description |
---|
LRUCachePolicy()
Creates a LRU cache policy object with zero cache capacity.
|
LRUCachePolicy(int min,
int max)
Creates a LRU cache policy object with the specified minimum
and maximum capacity.
|
Modifier and Type | Method and Description |
---|---|
protected void |
ageOut(LRUCachePolicy.LRUCacheEntry entry)
Callback method called when the cache algorithm ages out of the cache
the given entry.
|
protected void |
cacheMiss()
Callback method called when a cache miss happens.
|
void |
create()
Initializes the cache, creating all required objects and initializing their
values.
|
protected LRUCachePolicy.LRUCacheEntry |
createCacheEntry(Object key,
Object value)
Factory method for cache entries
|
protected LRUCachePolicy.LRUList |
createList()
Factory method for the linked list used by this cache implementation.
|
protected Map |
createMap()
Create map holding entries.
|
void |
destroy()
Destroys the cache that is now unusable.
|
void |
flush()
Flushes the cached objects from the cache.
|
Object |
get(Object key)
Returns the object paired with the specified key if it's
present in the cache, otherwise must return null.
|
void |
insert(Object key,
Object o)
Inserts the specified object into the cache following the
implemented policy.
|
Object |
peek(Object key)
Returns the object paired with the specified key if it's
present in the cache, otherwise must return null.
|
void |
remove(Object key)
Remove the cached object paired with the specified key.
|
int |
size() |
void |
start()
Starts this cache that is now ready to be used.
|
void |
stop()
Stops this cache thus
flush() ing all cached objects. |
protected Map m_map
protected LRUCachePolicy.LRUList m_list
protected int m_maxCapacity
protected int m_minCapacity
public LRUCachePolicy()
create()
public LRUCachePolicy(int min, int max)
min
- max
- create()
protected Map createMap()
public void create()
create
in interface CachePolicy
start()
,
destroy()
public void start()
start
in interface CachePolicy
create()
,
stop()
public void stop()
flush()
ing all cached objects. start()
will restart the cache.stop
in interface CachePolicy
start()
,
destroy()
public void destroy()
create()
ed and
re-start()
ed.destroy
in interface CachePolicy
create()
public Object get(Object key)
CachePolicy
CachePolicy.peek(java.lang.Object)
this method not only return whether
the object is present in the cache or not, but also
applies the implemented policy that will "refresh" the cached
object in the cache, because this cached object
was really requested.get
in interface CachePolicy
key
- the key paired with the objectCachePolicy.peek(java.lang.Object)
public Object peek(Object key)
CachePolicy
CachePolicy.get(java.lang.Object)
.peek
in interface CachePolicy
key
- the key paired with the objectCachePolicy.get(java.lang.Object)
public void insert(Object key, Object o)
CachePolicy
insert
in interface CachePolicy
key
- the key paired with the objecto
- the object to cacheCachePolicy.remove(java.lang.Object)
public void remove(Object key)
CachePolicy
remove
in interface CachePolicy
key
- the key paired with the objectCachePolicy.insert(java.lang.Object, java.lang.Object)
public void flush()
CachePolicy
flush
in interface CachePolicy
public int size()
size
in interface CachePolicy
protected LRUCachePolicy.LRUList createList()
protected void ageOut(LRUCachePolicy.LRUCacheEntry entry)
entry
- protected void cacheMiss()
protected LRUCachePolicy.LRUCacheEntry createCacheEntry(Object key, Object value)
key
- value
- Copyright © 2018 JBoss by Red Hat. All rights reserved.