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com.tangosol.net.cache
Class BackingMapBinaryEntry

java.lang.Object
com.tangosol.util.Base
com.tangosol.net.cache.BackingMapBinaryEntry

All Implemented Interfaces:

BinaryEntry, InvocableMap.Entry, QueryMap.Entry, java.util.Map.Entry

Direct Known Subclasses:

ReadWriteBackingMap.Entry

public class BackingMapBinaryEntry

extends Base

implements BinaryEntry

An implementation of the BinaryEntry interface that is based on specified binary key, binary value and BackingMapManagerContext. Analogous to the MapTrigger.Entry, it represents a pending change to an Entry that is about to committed to the underlying Map. For example, the original binary value of null indicates pending insert (a non-existing entry), while the binary value of null represents a pending remove operation.

It is currently only used by the ReadWriteBackingMap to communicate with the BinaryEntryStore.

This implementation is not thread safe.

Author:

gg 2009.11.22

Field Summary

protected Binary	m_binKey The Binary key.
protected Binary	m_binValue The Binary value.
protected Binary	m_binValueOrig The original Binary value.
protected long	m_cExpiryDelay Field holding the getExpiryDelay() property.
protected BackingMapManagerContext	m_ctx The backing map context.
protected java.lang.Object	m_oKey Lazily converted key in Object format.
protected java.lang.Object	m_oValue Lazily converted value in Object format.
protected java.lang.Object	m_oValueOrig Lazily converted original value in Object format.
protected static Binary	NO_VALUE Marker object used to indicate that a lazily converted value has not yet been calculated.

Constructor Summary

BackingMapBinaryEntry(Binary binKey, Binary binValue, Binary binValueOrig, BackingMapManagerContext ctx)
Construct a BackingMapBinaryEntry with the specified binary key, values and BackingMapManagerContext.

Method Summary

boolean	equals(java.lang.Object o) Compares the specified object with this entry for equality.
void	expire(long cMillis) Update the entry with the specified expiry delay.
java.lang.Object	extract(ValueExtractor extractor) Extract a value out of the Entry's value.
ObservableMap	getBackingMap() Obtain a reference to the backing map that this Entry corresponds to.
BackingMapContext	getBackingMapContext() Obtain a reference to the backing map context for the cache that this Entry corresponds to.
Binary	getBinaryKey() Return a raw binary key for this entry.
Binary	getBinaryValue() Return a raw binary value for this entry.
BackingMapManagerContext	getContext() Return the context this entry operates within.
long	getExpiryDelay() Get the "time to live" value for this entry.
java.lang.Object	getKey() Return the key corresponding to this entry.
Binary	getOriginalBinaryValue() Return a raw original binary value for this entry.
java.lang.Object	getOriginalValue() Return an original value for this entry.
Serializer	getSerializer() Return a Serializer that is used to serialize/deserialize this entry.
java.lang.Object	getValue() Return the value corresponding to this entry.
int	hashCode() Returns the hash code value for this entry.
boolean	isPresent() Determine if this Entry exists in the Map.
boolean	isReadOnly() Check whether this BinaryEntry allows data modification operations.
void	remove(boolean fSynthetic) Remove this Entry from the Map if it is present in the Map.
java.lang.Object	setValue(java.lang.Object oValue) Store the value corresponding to this entry.
void	setValue(java.lang.Object oValue, boolean fSynthetic) Store the value corresponding to this entry.
java.lang.String	toString() Render the entry as a String.
void	update(ValueUpdater updater, java.lang.Object oValue) Update the Entry's value.
void	updateBinaryValue(Binary binValue) Update the binary value for this entry.

Field Detail

m_ctx

protected BackingMapManagerContext m_ctx

The backing map context.

m_binKey

protected Binary m_binKey

The Binary key. This object reference will not change for the life of the Entry.

m_binValue

protected Binary m_binValue

The Binary value.

m_binValueOrig

protected Binary m_binValueOrig

The original Binary value.

m_cExpiryDelay

protected long m_cExpiryDelay

Field holding the getExpiryDelay() property.

m_oKey

protected java.lang.Object m_oKey

Lazily converted key in Object format.

m_oValue

protected java.lang.Object m_oValue

Lazily converted value in Object format.

m_oValueOrig

protected java.lang.Object m_oValueOrig

Lazily converted original value in Object format.

NO_VALUE

protected static final Binary NO_VALUE

Marker object used to indicate that a lazily converted value has not yet been calculated.

Constructor Detail

BackingMapBinaryEntry

public BackingMapBinaryEntry(Binary binKey,
                             Binary binValue,
                             Binary binValueOrig,
                             BackingMapManagerContext ctx)

Construct a BackingMapBinaryEntry with the specified binary key, values and BackingMapManagerContext.

Parameters:

binKey - the Binary key

binValue - the Binary value; could be null representing a non-existing entry

binValueOrig - an original Binary value; could be null representing an insert operation

ctx - a BackingMapManagerContext

Method Detail

getBinaryKey

public Binary getBinaryKey()

Return a raw binary key for this entry.

Specified by:

getBinaryKey in interface BinaryEntry

Returns:

a raw binary key for this entry

getBinaryValue

public Binary getBinaryValue()

Return a raw binary value for this entry.

Specified by:

getBinaryValue in interface BinaryEntry

Returns:

a raw binary value for this entry; null if the value does not exist

getOriginalBinaryValue

public Binary getOriginalBinaryValue()

Return a raw original binary value for this entry.

Specified by:

getOriginalBinaryValue in interface BinaryEntry

Returns:

a raw original binary value for this entry; null if the original value did not exist

getKey

public java.lang.Object getKey()

Return the key corresponding to this entry. The resultant key does not necessarily exist within the containing Map, which is to say that InvocableMap.this.containsKey(getKey()) could return false. To test for the presence of this key within the Map, use InvocableMap.Entry.isPresent(), and to create the entry for the key, use InvocableMap.Entry.setValue(java.lang.Object).

Specified by:

getKey in interface InvocableMap.Entry

Specified by:

getKey in interface java.util.Map.Entry

Returns:

the key corresponding to this entry; may be null if the underlying Map supports null keys

getValue

public java.lang.Object getValue()

Return the value corresponding to this entry. If the entry does not exist, then the value will be null. To differentiate between a null value and a non-existent entry, use InvocableMap.Entry.isPresent().

Note: any modifications to the value retrieved using this method are not guaranteed to persist unless followed by a InvocableMap.Entry.setValue(java.lang.Object) or InvocableMap.Entry.update(com.tangosol.util.ValueUpdater, java.lang.Object) call.

Specified by:

getValue in interface InvocableMap.Entry

Specified by:

getValue in interface java.util.Map.Entry

Returns:

the value corresponding to this entry; may be null if the value is null or if the Entry does not exist in the Map

getOriginalValue

public java.lang.Object getOriginalValue()

Return an original value for this entry.

Specified by:

getOriginalValue in interface BinaryEntry

Returns:

an original value for this entry

setValue

public java.lang.Object setValue(java.lang.Object oValue)

Store the value corresponding to this entry. If the entry does not exist, then the entry will be created by invoking this method, even with a null value (assuming the Map supports null values).

Specified by:

setValue in interface InvocableMap.Entry

Specified by:

setValue in interface java.util.Map.Entry

Parameters:

oValue - the new value for this Entry

Returns:

the previous value of this Entry, or null if the Entry did not exist

setValue

public void setValue(java.lang.Object oValue,
                     boolean fSynthetic)

Store the value corresponding to this entry. If the entry does not exist, then the entry will be created by invoking this method, even with a null value (assuming the Map supports null values).

Unlike the other form of setValue, this form does not return the previous value, and as a result may be significantly less expensive (in terms of cost of execution) for certain Map implementations.

Specified by:

setValue in interface InvocableMap.Entry

Parameters:

oValue - the new value for this Entry

fSynthetic - pass true only if the insertion into or modification of the Map should be treated as a synthetic event

updateBinaryValue

public void updateBinaryValue(Binary binValue)

Update the binary value for this entry.

Passing a non-null binary is functionally equivalent to:

   setValue(getContext().getValueFromInternalConverter().convert(binValue));
 

Passing null value is functionally equivalent to removing the entry.

   remove(false);
 

Specified by:

updateBinaryValue in interface BinaryEntry

Parameters:

binValue - a raw binary value to for this entry or null

getSerializer

public Serializer getSerializer()

Return a Serializer that is used to serialize/deserialize this entry.

Specified by:

getSerializer in interface BinaryEntry

Returns:

a Serializer that is used to serialize/deserialize this entry

getContext

public BackingMapManagerContext getContext()

Return the context this entry operates within.

Note: This method is a shortcut for the getBackingMapContext.getManagerContext() call.

Specified by:

getContext in interface BinaryEntry

Returns:

the BackingMapManagerContext for this entry

getBackingMap

public ObservableMap getBackingMap()

Obtain a reference to the backing map that this Entry corresponds to. The returned Map should be used in a read-only manner.

Note: This method is a shortcut for the getBackingMapContext.getBackingMap() call. As of Coherence 3.7, the returned type has been narrowed to ObservableMap.

Specified by:

getBackingMap in interface BinaryEntry

Returns:

the backing map reference; null if the entry does not have any backing map association

getBackingMapContext

public BackingMapContext getBackingMapContext()

Obtain a reference to the backing map context for the cache that this Entry corresponds to.

Specified by:

getBackingMapContext in interface BinaryEntry

Returns:

the corresponding BackingMapContext; null if the entry does not have any backing map association

expire

public void expire(long cMillis)

Update the entry with the specified expiry delay.

Note: this method only has an effect only if the associated backing map implements the CacheMap interface

Specified by:

expire in interface BinaryEntry

Parameters:

cMillis - the number of milliseconds until the entry will expire; pass CacheMap.EXPIRY_DEFAULT to use the default expiry setting; pass CacheMap.EXPIRY_NEVER to indicate that the entry should never expire

isReadOnly

public boolean isReadOnly()

Check whether this BinaryEntry allows data modification operations.

Specified by:

isReadOnly in interface BinaryEntry

Returns:

true iff the entry is "read-only"

update

public void update(ValueUpdater updater,
                   java.lang.Object oValue)

Update the Entry's value. Calling this method is semantically equivalent to:

   Object oTarget = entry.getValue();
   updater.update(oTarget, oValue);
   entry.setValue(oTarget, false);
 

The benefit of using this method is that it may allow the Entry implementation to significantly optimize the operation, such as for purposes of delta updates and backup maintenance.

Specified by:

update in interface InvocableMap.Entry

Parameters:

updater - a ValueUpdater used to modify the Entry's value

oValue - the new value for this Entry

isPresent

public boolean isPresent()

Determine if this Entry exists in the Map. If the Entry is not present, it can be created by calling InvocableMap.Entry.setValue(Object) or InvocableMap.Entry.setValue(Object, boolean). If the Entry is present, it can be destroyed by calling InvocableMap.Entry.remove(boolean).

Specified by:

isPresent in interface InvocableMap.Entry

Returns:

true iff this Entry is existent in the containing Map

remove

public void remove(boolean fSynthetic)

Remove this Entry from the Map if it is present in the Map.

This method supports both the operation corresponding to Map.remove(java.lang.Object) as well as synthetic operations such as eviction. If the containing Map does not differentiate between the two, then this method will always be identical to InvocableMap.this.remove(getKey()).

Specified by:

remove in interface InvocableMap.Entry

Parameters:

fSynthetic - pass true only if the removal from the Map should be treated as a synthetic event

extract

public java.lang.Object extract(ValueExtractor extractor)

Extract a value out of the Entry's value. Calling this method is semantically equivalent to extractor.extract(entry.getValue()), but this method may be significantly less expensive. For example, the resultant value may be obtained from a forward index, avoiding a potential object de-serialization.

Specified by:

extract in interface QueryMap.Entry

Parameters:

extractor - a ValueExtractor to apply to the Entry's value

Returns:

the extracted value

getExpiryDelay

public long getExpiryDelay()

Get the "time to live" value for this entry. The BackingMapBinaryEntry is commonly used as a "sandbox" for entry processors. This expiry value represents the time that the entry will live from the moment that it is committed to the backing map.

Returns:

the number of milliseconds from the moment this entry is committed until the entry expires, or CacheMap.EXPIRY_DEFAULT if the entry uses the default expiry setting; or CacheMap.EXPIRY_NEVER if the entry never expires

equals

public boolean equals(java.lang.Object o)

Compares the specified object with this entry for equality.

Specified by:

equals in interface java.util.Map.Entry

Parameters:

o - object to be compared for equality with this entry

Returns:

true if the specified object is equal to this entry

hashCode

public int hashCode()

Returns the hash code value for this entry.

Specified by:

hashCode in interface java.util.Map.Entry

Returns:

the hash code value for this entry.

See Also:

Object.hashCode(), Object.equals(Object), Map.Entry.equals(Object)

toString

public java.lang.String toString()

Render the entry as a String.

Returns:

the readable description for this entry

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