Package org.springframework.cache.guava

Class 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

    • 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 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)

      • get

        public <T> T get​(Object key,
                 Callable<T> valueLoader)
        Description copied from interface: Cache
        Return the value to which this cache maps the specified key, obtaining that value from valueLoader if necessary. This method provides a simple substitute for the conventional "if cached, return; otherwise create, cache and return" pattern.

        If possible, implementations should ensure that the loading operation is synchronized so that the specified valueLoader is only called once in case of concurrent access on the same key.

        If the valueLoader throws an exception, it is wrapped in a Cache.ValueRetrievalException

        Parameters:
        key - the key whose associated value is to be returned
        Returns:
        the value to which this cache maps the specified 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.