Package com.tangosol.net.cache

Class CacheStoreMap.ReadWriteMap

  • All Implemented Interfaces:
    Map
    Enclosing class:
    CacheStoreMap
    public static class CacheStoreMap.ReadWriteMap
extends AbstractKeyBasedMap
    A Map implementation that delegates straight through to a CacheStore.

    • Field Detail

      • m_store

        protected CacheStore m_store
        The CacheStore to delegate all Map operations to.

      • m_fBlind

        protected boolean m_fBlind
        True means that put() and remove() can return null, regardless of the presence of an old value.

      • m_fStoreUnsupported

        protected boolean m_fStoreUnsupported
        True means that a call to the CacheStore store() method is assumed to be unsupported.

      • m_fEraseUnsupported

        protected boolean m_fEraseUnsupported
        True means that a call to the CacheStore erase() method is assumed to be unsupported.

    • Constructor Detail

      • ReadWriteMap

        public ReadWriteMap​(CacheStore store,
                    boolean fBlind)
        Construct a read/write CacheStoreMap.
        Parameters:
        store - the CacheStore to delegate read and write operations to
        fBlind - pass true to optimize put() and remove() by allowing them to skip the loading of old values

    • Method Detail

      • containsKey

        public boolean containsKey​(Object oKey)
        Returns true if this map contains a mapping for the specified key.
        Specified by:
        containsKey in interface Map
        Overrides:
        containsKey in class AbstractKeyBasedMap
        Returns:
        true if this map contains a mapping for the specified key, false otherwise.

      • get

        public Object get​(Object oKey)
        Returns the value to which this map maps the specified key.
        Specified by:
        get in interface Map
        Specified by:
        get in class AbstractKeyBasedMap
        Parameters:
        oKey - the key object
        Returns:
        the value to which this map maps the specified key, or null if the map contains no mapping for this key

      • getAll

        public Map getAll​(Collection colKeys)
        Get all the specified keys, if they are in the Map. For each key that is in the cache, that key and its corresponding value will be placed in the map that is returned by this method. The absence of a key in the returned map indicates that it was not in the cache, which may imply (for caches that can load behind the scenes) that the requested data could not be loaded.
        Overrides:
        getAll in class AbstractKeyBasedMap
        Parameters:
        colKeys - a collection of keys that may be in the named cache
        Returns:
        a Map of keys to values for the specified keys passed in colKeys

      • iterateKeys

        protected Iterator iterateKeys()
        Create an iterator over the keys in this Map. The Iterator must support remove() if the Map supports removal.
        Specified by:
        iterateKeys in class AbstractKeyBasedMap
        Returns:
        a new instance of an Iterator over the keys in this Map

      • put

        public Object put​(Object oKey,
                  Object oValue)
        Associates the specified value with the specified key in this map.
        Specified by:
        put in interface Map
        Overrides:
        put in class AbstractKeyBasedMap
        Parameters:
        oKey - key with which the specified value is to be associated
        oValue - value to be associated with the specified key
        Returns:
        previous value associated with specified key, or null if there was no mapping for key

      • putAll

        public void putAll​(Map map)
        Copies all of the mappings from the specified map to this map. The effect of this call is equivalent to that of calling AbstractKeyBasedMap.put(K, V) on this map once for each mapping in the passed map. The behavior of this operation is unspecified if the passed map is modified while the operation is in progress.
        Specified by:
        putAll in interface Map
        Overrides:
        putAll in class AbstractKeyBasedMap
        Parameters:
        map - the Map containing the key/value pairings to put into this Map

      • remove

        public Object remove​(Object oKey)
        Removes the mapping for this key from this map if present. Expensive: updates both the underlying cache and the local cache.
        Specified by:
        remove in interface Map
        Overrides:
        remove in class AbstractKeyBasedMap
        Parameters:
        oKey - key whose mapping is to be removed from the map
        Returns:
        previous value associated with specified key, or null if there was no mapping for key. A null return can also indicate that the map previously associated null with the specified key, if the implementation supports null values.

      • removeBlind

        protected boolean removeBlind​(Object oKey)
        Removes the mapping for this key from this map if present. This method exists to allow sub-classes to optimize remove functionality for situations in which the original value is not required.
        Overrides:
        removeBlind in class AbstractKeyBasedMap
        Parameters:
        oKey - key whose mapping is to be removed from the map
        Returns:
        true iff the Map changed as the result of this operation

      • isBlindPutAllowed

        protected boolean isBlindPutAllowed()
        Determine if the "blind put" optimization is possible.
        Returns:
        true if put() can return null, regardless of the presence of an old value

      • isBlindRemoveAllowed

        protected boolean isBlindRemoveAllowed()
        Determine if the "blind remove" optimization is possible.
        Returns:
        true if remove() can return null, regardless of the presence of an old value

      • isStoreUnsupported

        protected boolean isStoreUnsupported()
        Determine if the CacheStore has been determined to be read-only for store() operations.
        Returns:
        true if any store() operations have failed due to UOE

      • isEraseUnsupported

        protected boolean isEraseUnsupported()
        Determine if the CacheStore has been determined to be read-only for erase() operations.
        Returns:
        true if any store() operations have failed due to UOE