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com.tangosol.net.cache
Class CompactSerializationCache.DeferredCacheEvent
java.lang.Object
java.util.EventObject
com.tangosol.util.MapEvent
com.tangosol.net.cache.CacheEvent
com.tangosol.net.cache.CompactSerializationCache.DeferredCacheEvent
- All Implemented Interfaces:
- java.io.Serializable
- Enclosing class:
- CompactSerializationCache
-
protected class CompactSerializationCache.DeferredCacheEvent
- extends CacheEvent
A DeferredCacheEvent is a CacheEvent
object that defers the loading of the old value
.
This event has two predominant states; active and inactive. The event is active from incarnation and can transition to inactive (via deactivate()
) but not vice-versa. Being active allows the getOldValue implementation to load the value from the BinaryStore
, thus all consumers of this event must ensure they call getOldValue prior to returning control when this event is dispatched.
Once inactive the correct value may no longer be available in the BinaryStore thus in this state a getOldValue will not perform a load
, however will return either null or the cached old value.
Field Summary |
protected Binary |
f_binKey
The Binary key used to retrieve the Binary value from the BinaryStore. |
protected boolean |
m_fActive
Whether the DeferredCacheEvent is in an active or inactive state. |
Fields inherited from class java.util.EventObject |
source |
Method Summary |
protected void |
deactivate()
Deactivate this DeferredCacheEvent instance resulting in any future getOldValue() calls using the cached value ultimately bypassing load . |
java.lang.Object |
getOldValue()
Return an old value associated with this event. |
Methods inherited from class com.tangosol.util.MapEvent |
dispatch, dispatch, dispatch, getDescription, getId, getKey, getMap, getNewEntry, getNewValue, getOldEntry, toString |
Methods inherited from class java.util.EventObject |
getSource |
f_binKey
protected final Binary f_binKey
- The Binary key used to retrieve the Binary value from the BinaryStore.
m_fActive
protected volatile boolean m_fActive
- Whether the DeferredCacheEvent is in an active or inactive state.
CompactSerializationCache.DeferredCacheEvent
public CompactSerializationCache.DeferredCacheEvent(int nId,
Binary binKey,
java.lang.Object oKey,
java.lang.Object oValueOld,
java.lang.Object oValueNew,
boolean fSynthetic)
- Constructs a new DeferredCacheEvent.
- Parameters:
nId
- this event's id, one of MapEvent.ENTRY_INSERTED
, MapEvent.ENTRY_UPDATED
or MapEvent.ENTRY_DELETED
binKey
- the binary key into the map
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
getOldValue
public java.lang.Object getOldValue()
- Return an old value associated with this event.
The old value represents a value deleted from or updated in a map. It is always null for "insert" notifications.
-
- Overrides:
getOldValue
in class MapEvent
-
- Returns:
- an old value
deactivate
protected void deactivate()
- Deactivate this DeferredCacheEvent instance resulting in any future
getOldValue()
calls using the cached value ultimately bypassing load
.
The contract between the DeferredCacheEvent and consumers of the event states that consumers must call getOldValue
prior to returning from fireEvent.
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