Package com.tangosol.net.cache

Class SimpleSerializationMap

java.lang.Object
com.tangosol.util.Base
com.tangosol.util.AbstractKeyBasedMap
com.tangosol.net.cache.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 Details

    • 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 Details

    • clear

      public void clear()
      Clear all key/value mappings.
      Specified by:
      clear in interface Map
      Overrides:
      clear in class AbstractKeyBasedMap

    • 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