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java.lang.Objectorg.springframework.util.CachingMapDecorator
public abstract class CachingMapDecorator
A simple decorator for a Map, encapsulating the workflow for caching expensive values in a target Map. Supports caching weak or strong keys.
This class is also an abstract template. Caching Map implementations
should subclass and override the create(key) method which
encapsulates expensive creation of a new object.
| Nested Class Summary |
|---|
| Nested classes/interfaces inherited from interface java.util.Map |
|---|
Map.Entry<K,V> |
| Constructor Summary | |
|---|---|
CachingMapDecorator()
Create a CachingMapDecorator with strong keys, using an underlying synchronized Map. |
|
CachingMapDecorator(boolean weakKeys)
Create a CachingMapDecorator, using an underlying synchronized Map. |
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CachingMapDecorator(boolean weakKeys,
int size)
Create a CachingMapDecorator with initial size, using an underlying synchronized Map. |
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CachingMapDecorator(Map targetMap)
Create a CachingMapDecorator for the given Map. |
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| Method Summary | |
|---|---|
void |
clear()
|
boolean |
containsKey(Object key)
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boolean |
containsValue(Object value)
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protected abstract Object |
create(Object key)
Create a value to cache for the given key. |
Set |
entrySet()
|
Object |
get(Object key)
Get value for key. |
boolean |
isEmpty()
|
Set |
keySet()
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Object |
put(Object key,
Object value)
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void |
putAll(Map t)
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Object |
remove(Object key)
|
int |
size()
|
String |
toString()
|
Collection |
values()
|
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
| Methods inherited from interface java.util.Map |
|---|
equals, hashCode |
| Constructor Detail |
|---|
public CachingMapDecorator()
public CachingMapDecorator(boolean weakKeys)
weakKeys - whether to use weak references for keys
public CachingMapDecorator(boolean weakKeys,
int size)
weakKeys - whether to use weak references for keyssize - the initial cache sizepublic CachingMapDecorator(Map targetMap)
The passed-in Map won't get synchronized explicitly, so make sure to pass in a properly synchronized Map, if desired.
targetMap - the Map to decorate| Method Detail |
|---|
public int size()
size in interface Mappublic boolean isEmpty()
isEmpty in interface Mappublic boolean containsKey(Object key)
containsKey in interface Mappublic boolean containsValue(Object value)
containsValue in interface Map
public Object put(Object key,
Object value)
put in interface Mappublic Object remove(Object key)
remove in interface Mappublic void putAll(Map t)
putAll in interface Mappublic void clear()
clear in interface Mappublic Set keySet()
keySet in interface Mappublic Collection values()
values in interface Mappublic Set entrySet()
entrySet in interface Mappublic Object get(Object key)
This implementation is not synchronized: This is highly concurrent but does not guarantee unique instances in the cache, as multiple values for the same key could get created in parallel. Consider overriding this method to synchronize it, if desired.
get in interface Mapcreate(Object)protected abstract Object create(Object key)
get if there is no value cached already.
key - the cache keyget(Object)public String toString()
toString in class Object
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