Package com.tangosol.net.cache

Class SimpleSerializationMap

  • All Implemented Interfaces:
    Map
    public class SimpleSerializationMap
extends AbstractKeyBasedMap
    Map implementation that stores and accesses its contents through an underlying BinaryStore. The Map does not maintain additional state, such as the keys that it contains, which allows it to manage very large sets of data. However, a number of operations that would normally be "free" are potentially very expensive with this implementation. For example, size() has to iterate through all the keys provided by the underlying BinaryStore, and containsKey(java.lang.Object) has to read the value from the underlying BinaryStore to prove its existence.
    Since:
    Coherence 3.1
    Author:
    cp 2005.11.23

    • Constructor Detail

      • SimpleSerializationMap

        public SimpleSerializationMap​(BinaryStore store)
        Construct a SimpleSerializationMap on top of a BinaryStore.
        Parameters:
        store - the BinaryStore to use to write the serialized objects to

      • SimpleSerializationMap

        public SimpleSerializationMap​(BinaryStore store,
                              ClassLoader loader)
        Construct a SimpleSerializationMap on top of a BinaryStore, using the passed ClassLoader for deserialization.
        Parameters:
        store - the BinaryStore to use to write the serialized objects to
        loader - the ClassLoader to use for deserialization

      • SimpleSerializationMap

        public SimpleSerializationMap​(BinaryStore store,
                              boolean fBinaryMap)
        Construct a SimpleSerializationMap on top of a BinaryStore, optionally storing only Binary keys and values.
        Parameters:
        store - the BinaryStore to use to write the serialized objects to
        fBinaryMap - true indicates that this map will only manage binary keys and 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.

      • containsValue

        public boolean containsValue​(Object oValue)
        Returns true if this Map maps one or more keys to the specified value.
        Specified by:
        containsValue in interface Map
        Overrides:
        containsValue in class AbstractKeyBasedMap
        Returns:
        true if this Map maps one or more keys to the specified value, 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

      • isEmpty

        public boolean isEmpty()
        Returns true if this map contains no key-value mappings.
        Specified by:
        isEmpty in interface Map
        Overrides:
        isEmpty in class AbstractKeyBasedMap
        Returns:
        true if this map contains no key-value mappings

      • 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.

      • size

        public int size()
        Returns the number of key-value mappings in this map.
        Specified by:
        size in interface Map
        Overrides:
        size in class AbstractKeyBasedMap
        Returns:
        the number of key-value mappings in this map

      • 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

      • 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

      • toString

        public String toString()
        Returns a string representation of this Map. The string representation consists of a list of key-value mappings in the order returned by the Map's entrySet view's iterator, enclosed in braces ("{}"). Adjacent mappings are separated by the characters ", " (comma and space). Each key-value mapping is rendered as the key followed by an equals sign ("=") followed by the associated value. Keys and values are converted to strings as by String.valueOf(Object).
        Overrides:
        toString in class AbstractKeyBasedMap
        Returns:
        a String representation of this Map

      • getBinaryStore

        public BinaryStore getBinaryStore()
        Returns the BinaryStore that this map uses for its storage.

        Note: This implementation assumes that the BinaryStore is only being modified by this Map instance. If you modify the BinaryStore contents, the behavior of this Map is undefined.

        Returns:
        the BinaryStore

      • setBinaryStore

        protected void setBinaryStore​(BinaryStore store)
        Configures the BinaryStore that this map will use for its storage.
        Parameters:
        store - the BinaryStore to use

      • getClassLoader

        public ClassLoader getClassLoader()
        Returns the ClassLoader that this map uses for deserialization, if it has one.
        Returns:
        the ClassLoader that this map uses for deserialization; may be null

      • setClassLoader

        protected void setClassLoader​(ClassLoader loader)
        Configure the ClassLoader that this map will use for deserialization.
        Parameters:
        loader - the ClassLoader that this map should use for deserialization

      • isBinaryMap

        public boolean isBinaryMap()
        Determine if the keys and values in this map are known to be all Binary.
        Returns:
        true if all keys and values will be Binary to start with, and thus will not require conversion

      • setBinaryMap

        protected void setBinaryMap​(boolean fBinary)
        Configure the Map to be aware that all the keys and values in the map are known to be Binary or not.
        Parameters:
        fBinary - pass true if all keys and values will be Binary

      • getCacheStatistics

        public CacheStatistics getCacheStatistics()
        Returns the CacheStatistics for this cache.
        Returns:
        a CacheStatistics object

      • toBinary

        protected Binary toBinary​(Object o)
        Translate the passed Object object into an Binary object.
        Parameters:
        o - the Object to serialize into a Binary object
        Returns:
        the Binary object

      • fromBinary

        protected Object fromBinary​(Binary bin)
        Translate the passed Binary object into an Object object.
        Parameters:
        bin - the Binary object to deserialize
        Returns:
        the deserialized object