org.terracotta.offheapstore.storage
Class SplitStorageEngine<K,V>

java.lang.Object
  org.terracotta.offheapstore.storage.SplitStorageEngine<K,V>

Type Parameters:

K - key type handled by this engine

V - value type handled by this engine

All Implemented Interfaces:

StorageEngine<K,V>

Direct Known Subclasses:

PersistentSplitStorageEngine

public class SplitStorageEngine<K,V>
extends Object
implements StorageEngine<K,V>

A StorageEngine composed of two independent engines, one for the keys, one for the values.

Author:

Chris Dennis

Nested Class Summary

Nested classes/interfaces inherited from interface org.terracotta.offheapstore.storage.StorageEngine

StorageEngine.Owner

Field Summary

protected HalfStorageEngine<? super K>	keyStorageEngine
protected HalfStorageEngine<? super V>	valueStorageEngine

Constructor Summary

SplitStorageEngine(HalfStorageEngine<? super K> keyStorageEngine, HalfStorageEngine<? super V> valueStorageEngine)
Creates a composite storage engine, with independent key and value engines.

Method Summary

void	attachedMapping(long encoding, int hash, int metadata)
void	bind(StorageEngine.Owner owner)
void	clear() Called to indicate that all keys and values are now free.
static <K,V> Factory<SplitStorageEngine<K,V>>	createFactory(Factory<? extends HalfStorageEngine<K>> keyFactory, Factory<? extends HalfStorageEngine<V>> valueFactory)
void	destroy()
static long	encoding(int keyEncoding, int valueEncoding)
boolean	equalsKey(Object key, long encoding) Called to determine the equality of the given object against the given encoded form.
boolean	equalsValue(Object value, long encoding) Called to determine the equality of the given Java object value against the given encoded form.
void	freeMapping(long encoding, int hash, boolean removal) Called to indicate that the associated encoded value is no longer needed.
long	getAllocatedMemory() Returns a measure of the amount of memory allocated for this storage engine.
long	getDataSize() Returns a measure of the total size of the keys and values stored in this storage engine.
long	getOccupiedMemory() Returns a measure of the amount of memory consumed by this storage engine.
long	getVitalMemory() Returns a measure of the amount of vital memory allocated for this storage engine.
void	invalidateCache() Invalidate any local key/value caches.
static int	keyEncoding(long encoding)
K	readKey(long encoding, int hashCode) Converts the supplied encoded key into its correct object form.
V	readValue(long encoding) Converts the supplied encoded value into its correct object form.
boolean	shrink()
String	toString()
static int	valueEncoding(long encoding)
Long	writeMapping(K key, V value, int hash, int metadata) Converts the supplied key and value objects into their encoded form.

Methods inherited from class java.lang.Object

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

Field Detail

keyStorageEngine

protected final HalfStorageEngine<? super K> keyStorageEngine

valueStorageEngine

protected final HalfStorageEngine<? super V> valueStorageEngine

Constructor Detail

SplitStorageEngine

public SplitStorageEngine(HalfStorageEngine<? super K> keyStorageEngine,
                          HalfStorageEngine<? super V> valueStorageEngine)

Creates a composite storage engine, with independent key and value engines.

Parameters:

keyStorageEngine - storage engine for the keys

valueStorageEngine - storage engine for the values

Method Detail

createFactory

public static <K,V> Factory<SplitStorageEngine<K,V>> createFactory(Factory<? extends HalfStorageEngine<K>> keyFactory,
                                                                   Factory<? extends HalfStorageEngine<V>> valueFactory)

writeMapping

public Long writeMapping(K key,
                         V value,
                         int hash,
                         int metadata)

Description copied from interface: StorageEngine

Converts the supplied key and value objects into their encoded form.

Specified by:

writeMapping in interface StorageEngine<K,V>

Parameters:

key - a key object

value - a value object

hash - the key hash

metadata - the metadata bits

Returns:

the encoded mapping

attachedMapping

public void attachedMapping(long encoding,
                            int hash,
                            int metadata)

Specified by:

attachedMapping in interface StorageEngine<K,V>

freeMapping

public void freeMapping(long encoding,
                        int hash,
                        boolean removal)

Description copied from interface: StorageEngine

Called to indicate that the associated encoded value is no longer needed.

This call can be used to free any associated resources tied to the lifecycle of the supplied encoded value.

Specified by:

freeMapping in interface StorageEngine<K,V>

Parameters:

encoding - encoded value

hash - hash of the freed mapping

removal - marks removal from a map

readValue

public V readValue(long encoding)

Description copied from interface: StorageEngine

Converts the supplied encoded value into its correct object form.

Specified by:

readValue in interface StorageEngine<K,V>

Parameters:

encoding - encoded value

Returns:

a decoded value object

equalsValue

public boolean equalsValue(Object value,
                           long encoding)

Description copied from interface: StorageEngine

Called to determine the equality of the given Java object value against the given encoded form.

Simple implementations will probably perform a decode on the given encoded form in order to do a regular Object.equals(Object) comparison. This method is provided to allow implementations to optimize this comparison if possible.

Specified by:

equalsValue in interface StorageEngine<K,V>

Parameters:

value - a value object

encoding - encoded value

Returns:

true if the value and the encoding are equal

readKey

public K readKey(long encoding,
                 int hashCode)

Description copied from interface: StorageEngine

Converts the supplied encoded key into its correct object form.

Specified by:

readKey in interface StorageEngine<K,V>

Parameters:

encoding - encoded key

hashCode - hash-code of the decoded key

Returns:

a decoded key object

equalsKey

public boolean equalsKey(Object key,
                         long encoding)

Description copied from interface: StorageEngine

Called to determine the equality of the given object against the given encoded form.

Simple implementations will probably perform a decode on the given encoded form in order to do a regular Object.equals(Object) comparison. This method is provided to allow implementations to optimize this comparison if possible.

Specified by:

equalsKey in interface StorageEngine<K,V>

Parameters:

key - a key object

encoding - encoded value

Returns:

true if the key and the encoding are equal

clear

public void clear()

Description copied from interface: StorageEngine

Called to indicate that all keys and values are now free.

Specified by:

clear in interface StorageEngine<K,V>

getAllocatedMemory

public long getAllocatedMemory()

Description copied from interface: StorageEngine

Returns a measure of the amount of memory allocated for this storage engine.

Specified by:

getAllocatedMemory in interface StorageEngine<K,V>

Returns:

memory allocated for this engine in bytes

getOccupiedMemory

public long getOccupiedMemory()

Description copied from interface: StorageEngine

Returns a measure of the amount of memory consumed by this storage engine.

Specified by:

getOccupiedMemory in interface StorageEngine<K,V>

Returns:

memory occupied by this engine in bytes

getVitalMemory

public long getVitalMemory()

Description copied from interface: StorageEngine

Returns a measure of the amount of vital memory allocated for this storage engine.

Specified by:

getVitalMemory in interface StorageEngine<K,V>

Returns:

vital memory allocated for this engine in bytes

getDataSize

public long getDataSize()

Description copied from interface: StorageEngine

Returns a measure of the total size of the keys and values stored in this storage engine.

Specified by:

getDataSize in interface StorageEngine<K,V>

Returns:

size of the stored keys and values in bytes

toString

public String toString()

Overrides:

toString in class Object

invalidateCache

public void invalidateCache()

Description copied from interface: StorageEngine

Invalidate any local key/value caches.

This is called to indicate the termination of a map write "phase". Caching is permitted within a write operation (i.e. to cache around allocation failures during eviction processes).

Specified by:

invalidateCache in interface StorageEngine<K,V>

bind

public void bind(StorageEngine.Owner owner)

Specified by:

bind in interface StorageEngine<K,V>

destroy

public void destroy()

Specified by:

destroy in interface StorageEngine<K,V>

shrink

public boolean shrink()

Specified by:

shrink in interface StorageEngine<K,V>

valueEncoding

public static int valueEncoding(long encoding)

keyEncoding

public static int keyEncoding(long encoding)

encoding

public static long encoding(int keyEncoding,
                            int valueEncoding)