org.springframework.cache.guava

Class GuavaCache

java.lang.Object

org.springframework.cache.support.AbstractValueAdaptingCache

org.springframework.cache.guava.GuavaCache

All Implemented Interfaces:

Cache

public class GuavaCache
extends AbstractValueAdaptingCache

Spring Cache adapter implementation on top of a Guava Cache instance.

Requires Google Guava 12.0 or higher.

Since:

4.0

Author:

Juergen Hoeller, Stephane Nicoll

Nested Class Summary

Nested classes/interfaces inherited from interface org.springframework.cache.Cache

Cache.ValueWrapper

Constructor Summary

Constructors

Constructor and Description
GuavaCache(String name, com.google.common.cache.Cache<Object,Object> cache) Create a GuavaCache instance with the specified name and the given internal Cache to use.
GuavaCache(String name, com.google.common.cache.Cache<Object,Object> cache, boolean allowNullValues) Create a GuavaCache instance with the specified name and the given internal Cache to use.

Method Summary

Modifier and Type	Method and Description
void	clear() Remove all mappings from the cache.
void	evict(Object key) Evict the mapping for this key from this cache if it is present.
Cache.ValueWrapper	get(Object key) Return the value to which this cache maps the specified key.
String	getName() Return the cache name.
com.google.common.cache.Cache<Object,Object>	getNativeCache() Return the the underlying native cache provider.
protected Object	lookup(Object key) Perform an actual lookup in the underlying store.
void	put(Object key, Object value) Associate the specified value with the specified key in this cache.
Cache.ValueWrapper	putIfAbsent(Object key, Object value) Atomically associate the specified value with the specified key in this cache if it is not set already.

Methods inherited from class org.springframework.cache.support.AbstractValueAdaptingCache

fromStoreValue, get, isAllowNullValues, toStoreValue, toValueWrapper

Methods inherited from class java.lang.Object

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

Constructor Detail

GuavaCache

public GuavaCache(String name,
                  com.google.common.cache.Cache<Object,Object> cache)

Create a GuavaCache instance with the specified name and the given internal Cache to use.

Parameters:

name - the name of the cache

cache - the backing Guava Cache instance

GuavaCache

public GuavaCache(String name,
                  com.google.common.cache.Cache<Object,Object> cache,
                  boolean allowNullValues)

Create a GuavaCache instance with the specified name and the given internal Cache to use.

Parameters:

name - the name of the cache

cache - the backing Guava Cache instance

allowNullValues - whether to accept and convert null values for this cache

Method Detail

getName

public final String getName()

Description copied from interface: Cache

Return the cache name.

getNativeCache

public final com.google.common.cache.Cache<Object,Object> getNativeCache()

Description copied from interface: Cache

Return the the underlying native cache provider.

get

public Cache.ValueWrapper get(Object key)

Description copied from interface: Cache

Return the value to which this cache maps the specified key.

Returns null if the cache contains no mapping for this key; otherwise, the cached value (which may be null itself) will be returned in a Cache.ValueWrapper.

Specified by:

get in interface Cache

Overrides:

get in class AbstractValueAdaptingCache

Parameters:

key - the key whose associated value is to be returned

Returns:

the value to which this cache maps the specified key, contained within a Cache.ValueWrapper which may also hold a cached null value. A straight null being returned means that the cache contains no mapping for this key.

See Also:

Cache.get(Object, Class)

lookup

protected Object lookup(Object key)

Description copied from class: AbstractValueAdaptingCache

Perform an actual lookup in the underlying store.

Specified by:

lookup in class AbstractValueAdaptingCache

Parameters:

key - the key whose associated value is to be returned

Returns:

the raw store value for the key

put

public void put(Object key,
                Object value)

Description copied from interface: Cache

Associate the specified value with the specified key in this cache.

If the cache previously contained a mapping for this key, the old value is replaced by the specified value.

Parameters:

key - the key with which the specified value is to be associated

value - the value to be associated with the specified key

putIfAbsent

public Cache.ValueWrapper putIfAbsent(Object key,
                                      Object value)

Description copied from interface: Cache

Atomically associate the specified value with the specified key in this cache if it is not set already.

This is equivalent to:

 Object existingValue = cache.get(key);
 if (existingValue == null) {
     cache.put(key, value);
     return null;
 } else {
     return existingValue;
 }
 

except that the action is performed atomically. While all out-of-the-box CacheManager implementations are able to perform the put atomically, the operation may also be implemented in two steps, e.g. with a check for presence and a subsequent put, in a non-atomic way. Check the documentation of the native cache implementation that you are using for more details.

Parameters:

key - the key with which the specified value is to be associated

value - the value to be associated with the specified key

Returns:

the value to which this cache maps the specified key (which may be null itself), or also null if the cache did not contain any mapping for that key prior to this call. Returning null is therefore an indicator that the given value has been associated with the key.

evict

public void evict(Object key)

Description copied from interface: Cache

Evict the mapping for this key from this cache if it is present.

Parameters:

key - the key whose mapping is to be removed from the cache

clear

public void clear()

Description copied from interface: Cache

Remove all mappings from the cache.