Package com.tangosol.net.cache

Class OverflowMap.HistoricCacheEvent

java.lang.Object

java.util.EventObject

com.tangosol.util.MapEvent

com.tangosol.net.cache.CacheEvent

com.tangosol.net.cache.OverflowMap.HistoricCacheEvent

All Implemented Interfaces:

PortableObject, CollectionEvent, Serializable

Enclosing class:

OverflowMap

protected static class OverflowMap.HistoricCacheEvent
extends CacheEvent

A CacheEvent that carries a recent value (to avoid it being lost during eviction).

See Also:

• Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class com.tangosol.net.cache.CacheEvent

CacheEvent.TransformationState

Field Summary

Fields

Modifier and Type	Field	Description
protected Object	m_oValueLatestOld	A previous value, but the most recent of the previous values.

Fields inherited from class com.tangosol.net.cache.CacheEvent

EXPIRED, m_nFlags, m_transformState, PRIMING, SYNTHETIC

Fields inherited from class com.tangosol.util.MapEvent

ENTRY_DELETED, ENTRY_INSERTED, ENTRY_UPDATED, m_key, m_nId, m_nPartition, m_nVersion, m_valueNew, m_valueOld

Fields inherited from class java.util.EventObject

source

Constructor Summary

Constructors

Constructor	Description
HistoricCacheEvent(ObservableMap map, int nId, Object oKey, Object oValueOld, Object oValueNew, boolean fSynthetic, Object oValueRecent)	Create a Historic CacheEvent that contains the most recent value before the now-current value.

Method Summary

Modifier and Type	Method	Description
Object	getLatestOldValue()	Obtain the value that needs to be saved if this event represents a merged sequence of events ending with the eviction of data.

Methods inherited from class com.tangosol.net.cache.CacheEvent

getDescription, getTransformationState, isExpired, isPriming, isSynthetic, isVersionUpdate, shouldDispatch, with

Methods inherited from class com.tangosol.util.MapEvent

dispatch, dispatch, dispatch, getDescription, getId, getKey, getMap, getNewEntry, getNewValue, getOldEntry, getOldValue, getPartition, getVersion, isDelete, isInsert, isUpdate, readExternal, toString, writeExternal

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 Details

m_oValueLatestOld

protected Object m_oValueLatestOld

A previous value, but the most recent of the previous values.

Constructor Details

HistoricCacheEvent

public HistoricCacheEvent(ObservableMap map,
 int nId,
 Object oKey,
 Object oValueOld,
 Object oValueNew,
 boolean fSynthetic,
 Object oValueRecent)

Create a Historic CacheEvent that contains the most recent value before the now-current value.

Parameters:

map - the ObservableMap object that fired the event

nId - this event id as defined by the MapEvent class

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 historically synthetic

oValueRecent - the most recent value before the new value

Method Details

getLatestOldValue

public Object getLatestOldValue()

Obtain the value that needs to be saved if this event represents a merged sequence of events ending with the eviction of data.

Returns:

the most recent data value before the new value