com.tangosol.net.cache

Class CacheEvent<K,V>

java.lang.Object

java.util.EventObject

com.tangosol.util.MapEvent<K,V>

com.tangosol.net.cache.CacheEvent<K,V>

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

AbstractKeyBasedMap.DeferredCacheEvent, ConverterCollections.ConverterMapEvent, MapListenerSupport.FilterEvent, OverflowMap.HistoricCacheEvent

public class CacheEvent<K,V>
extends MapEvent<K,V>

An extension of the MapEvent which allows to differentiate between client driven (natural) events and cache internal (synthetic) events.

Consider a client code calling a remove() method for a cache. Quite naturally it causes a corresponding ENTRY_DELETED event. However, the same event could be as well caused by the client code calling put() forcing an entry eviction. Alternatively, the put() method called by a client code naturally causes either ENTRY_INSERTED or ENTRY_UPDATED event. However, the same event could be as well caused by a client call to a get() method that in turn forces an entry insertion by a cache loader.

Since:

Coherence 2.3

Author:

gg 2003.09.12

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	CacheEvent.TransformationState TransformationState describes how a CacheEvent has been or should be transformed.

Field Summary

Fields

Modifier and Type	Field and Description
protected boolean	m_fSynthetic Flag indicating whether or not the event is synthetic.
protected CacheEvent.TransformationState	m_transformState The transformation state for this event.

Fields inherited from class com.tangosol.util.MapEvent

ENTRY_DELETED, ENTRY_INSERTED, ENTRY_UPDATED, m_nId, m_oKey, m_oValueNew, m_oValueOld

Fields inherited from class java.util.EventObject

source

Constructor Summary

Constructors

Constructor and Description
CacheEvent(ObservableMap<K,V> map, int nId, K oKey, V oValueOld, V oValueNew, boolean fSynthetic) Constructs a new CacheEvent.
CacheEvent(ObservableMap<K,V> map, int nId, K oKey, V oValueOld, V oValueNew, boolean fSynthetic, CacheEvent.TransformationState transformState) Constructs a new CacheEvent.

Method Summary

Modifier and Type	Method and Description
protected String	getDescription() Get the event's description.
CacheEvent.TransformationState	getTransformationState() Return true iff this event is transformable.
boolean	isSynthetic() Return true iff this event is caused by the cache internal processing such as eviction or loading

Methods inherited from class com.tangosol.util.MapEvent

dispatch, dispatch, dispatch, getDescription, getId, getKey, getMap, getNewEntry, getNewValue, getOldEntry, getOldValue, toString

Methods inherited from class java.util.EventObject

getSource

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

m_fSynthetic

protected boolean m_fSynthetic

Flag indicating whether or not the event is synthetic.

m_transformState

protected CacheEvent.TransformationState m_transformState

The transformation state for this event.

Constructor Detail

CacheEvent

public CacheEvent(ObservableMap<K,V> map,
                  int nId,
                  K oKey,
                  V oValueOld,
                  V oValueNew,
                  boolean fSynthetic)

Constructs a new CacheEvent.

Parameters:

map - the ObservableMap object that fired the event

nId - this event's id, one of MapEvent.ENTRY_INSERTED, MapEvent.ENTRY_UPDATED or MapEvent.ENTRY_DELETED

oKey - the key into the map

oValueOld - the old value (for update and delete events)

oValueNew - the new value (for insert and update events)

fSynthetic - true iff the event is caused by the cache internal processing such as eviction or loading

CacheEvent

public CacheEvent(ObservableMap<K,V> map,
                  int nId,
                  K oKey,
                  V oValueOld,
                  V oValueNew,
                  boolean fSynthetic,
                  CacheEvent.TransformationState transformState)

Constructs a new CacheEvent.

Parameters:

map - the ObservableMap object that fired the event

nId - this event's id, one of MapEvent.ENTRY_INSERTED, MapEvent.ENTRY_UPDATED or MapEvent.ENTRY_DELETED

oKey - the key into the map

oValueOld - the old value (for update and delete events)

oValueNew - the new value (for insert and update events)

fSynthetic - true iff the event is caused by the cache internal processing such as eviction or loading

transformState - the state describing how this event has been or should be transformed

Method Detail

isSynthetic

public boolean isSynthetic()

Return true iff this event is caused by the cache internal processing such as eviction or loading

Returns:

true iff this event is caused by the cache internal processing

getTransformationState

public CacheEvent.TransformationState getTransformationState()

Return true iff this event is transformable. Non-transformable events will not be delivered to MapEventTransformer listeners.

Returns:

true iff this event is transformable

getDescription

protected String getDescription()

Get the event's description.

Overrides:

getDescription in class MapEvent<K,V>

Returns:

this event's description