Package com.tangosol.util

Interface ObservableMap<K,V>

Type Parameters:

K - the type of the Map entry keys

V - the type of the Map entry values

All Superinterfaces:

Map<K,V>

All Known Subinterfaces:

CacheMap<K,V>, ConfigurableCacheMap, NamedCache<K,V>, NamedMap<K,V>

All Known Implementing Classes:

AbstractSerializationCache, BundlingNamedCache, CaffeineCache, ContinuousQueryCache, ConverterCollections.ConverterCacheMap, ConverterCollections.ConverterNamedCache, ConverterCollections.ConverterObservableMap, LocalCache, NearCache, NullImplementation.NullObservableMap, ObservableHashMap, ObservableSplittingBackingCache, ObservableSplittingBackingMap, OverflowMap, ReadonlyNamedCache, ReadWriteBackingMap, ReadWriteSplittingBackingMap, SerializationCache, SerializationPagedCache, VersionedBackingMap, VersionedNearCache, WrapperConcurrentMap, WrapperNamedCache, WrapperObservableMap

public interface ObservableMap<K,V>
extends Map<K,V>

ObservableMap interface represents an object with a model being a Map that allows for pluggable notifications for occurring changes.

This is primarily intended for maps that have automatic pruning and purging strategies or maps that are asynchronously modified by different threads.

Starting from Coherence 2.3 it supports optimizations that optionally do not require the map values to be included in the map events, allowing a "lite" event to be delivered and saving memory, processing and bandwidth for distributed applications.

Author:

gg 2002.02.11, cp 2003.05.21

See Also:

• NamedCache
• LocalCache
• ObservableHashMap

Nested Class Summary

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K,V>

Method Summary

Modifier and Type	Method	Description
void	addMapListener(MapListener<? super K,? super V> listener)	Add a standard map listener that will receive all events (inserts, updates, deletes) that occur against the map, with the key, old-value and new-value included.
void	addMapListener(MapListener<? super K,? super V> listener, Filter filter, boolean fLite)	Add a map listener that receives events based on a filter evaluation.
void	addMapListener(MapListener<? super K,? super V> listener, K key, boolean fLite)	Add a map listener for a specific key.
void	removeMapListener(MapListener<? super K,? super V> listener)	Remove a standard map listener that previously signed up for all events.
void	removeMapListener(MapListener<? super K,? super V> listener, Filter filter)	Remove a map listener that previously signed up for events based on a filter evaluation.
void	removeMapListener(MapListener<? super K,? super V> listener, K key)	Remove a map listener that previously signed up for events about a specific key.

Methods inherited from interface java.util.Map

clear, compute, computeIfAbsent, computeIfPresent, containsKey, containsValue, entrySet, equals, forEach, get, getOrDefault, hashCode, isEmpty, keySet, merge, put, putAll, putIfAbsent, remove, remove, replace, replace, replaceAll, size, values

Method Details

addMapListener

void addMapListener(MapListener<? super K,? super V> listener)

Add a standard map listener that will receive all events (inserts, updates, deletes) that occur against the map, with the key, old-value and new-value included. This has the same result as the following call:

   addMapListener(listener, (Filter) null, false);
 

Parameters:

listener - the MapEvent listener to add

removeMapListener

void removeMapListener(MapListener<? super K,? super V> listener)

Remove a standard map listener that previously signed up for all events. This has the same result as the following call:

   removeMapListener(listener, (Filter) null);
 

Parameters:

listener - the listener to remove

addMapListener

void addMapListener(MapListener<? super K,? super V> listener,
 K key,
 boolean fLite)

Add a map listener for a specific key.

The listeners will receive MapEvent objects, but if fLite is passed as true, they might not contain the OldValue and NewValue properties.

To unregister the MapListener, use the removeMapListener(MapListener, Object) method.

Parameters:

listener - the MapEvent listener to add

key - the key that identifies the entry for which to raise events

fLite - true to indicate that the MapEvent objects do not have to include the OldValue and NewValue property values in order to allow optimizations

Since:

Coherence 2.3

removeMapListener

void removeMapListener(MapListener<? super K,? super V> listener,
 K key)

Remove a map listener that previously signed up for events about a specific key.

Parameters:

listener - the listener to remove

key - the key that identifies the entry for which to raise events

Since:

Coherence 2.3

addMapListener

void addMapListener(MapListener<? super K,? super V> listener,
 Filter filter,
 boolean fLite)

Add a map listener that receives events based on a filter evaluation.

The listeners will receive MapEvent objects, but if fLite is passed as true, they might not contain the OldValue and NewValue properties.

To unregister the MapListener, use the removeMapListener(MapListener, Filter) method.

Parameters:

listener - the MapEvent listener to add

filter - a filter that will be passed MapEvent objects to select from; a MapEvent will be delivered to the listener only if the filter evaluates to true for that MapEvent (see MapEventFilter); null is equivalent to a filter that alway returns true

fLite - true to indicate that the MapEvent objects do not have to include the OldValue and NewValue property values in order to allow optimizations

Since:

Coherence 2.3

removeMapListener

void removeMapListener(MapListener<? super K,? super V> listener,
 Filter filter)

Remove a map listener that previously signed up for events based on a filter evaluation.

Parameters:

listener - the listener to remove

filter - the filter that was passed into the corresponding addMapListener() call

Since:

Coherence 2.3