org.terracotta.offheapstore.storage
Class IntegerStorageEngine

java.lang.Object
  org.terracotta.offheapstore.storage.IntegerStorageEngine

All Implemented Interfaces:

HalfStorageEngine<Integer>

Direct Known Subclasses:

PersistentIntegerStorageEngine

public class IntegerStorageEngine
extends Object
implements HalfStorageEngine<Integer>

A symmetric Integer storage engine.

This engine stores the keys and values directly as their primitive representations, and therefore uses no additional data structure.

Author:

Chris Dennis

Constructor Summary

IntegerStorageEngine()

Method Summary

void	bind(StorageEngine.Owner owner, long mask)
void	clear() Called to indicate that all keys and values are now free.
static Factory<IntegerStorageEngine>	createFactory()
void	destroy()
boolean	equals(Object key, int address) Called to determine the equality of the given Java object value against the given encoded form.
void	free(int address) 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.
static IntegerStorageEngine	instance()
void	invalidateCache() Invalidate any local key/value caches.
Integer	read(int address) Converts the supplied encoded value into its correct object form.
boolean	shrink()
Integer	write(Integer value, int hash) Converts the supplied value object into it's encoded form.

Methods inherited from class java.lang.Object

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

Constructor Detail

IntegerStorageEngine

public IntegerStorageEngine()

Method Detail

instance

public static IntegerStorageEngine instance()

createFactory

public static Factory<IntegerStorageEngine> createFactory()

read

public Integer read(int address)

Description copied from interface: HalfStorageEngine

Converts the supplied encoded value into its correct object form.

Specified by:

read in interface HalfStorageEngine<Integer>

Parameters:

address - encoded value

Returns:

a decoded value object

write

public Integer write(Integer value,
                     int hash)

Description copied from interface: HalfStorageEngine

Converts the supplied value object into it's encoded form.

Specified by:

write in interface HalfStorageEngine<Integer>

Parameters:

value - a value object

hash - the keys hash

Returns:

encoded value

free

public void free(int address)

Description copied from interface: HalfStorageEngine

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:

free in interface HalfStorageEngine<Integer>

Parameters:

address - encoded value

equals

public boolean equals(Object key,
                      int address)

Description copied from interface: HalfStorageEngine

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:

equals in interface HalfStorageEngine<Integer>

Parameters:

key - a value object

address - encoded value

Returns:

true if the value and the encoding are equal

clear

public void clear()

Description copied from interface: HalfStorageEngine

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

Specified by:

clear in interface HalfStorageEngine<Integer>

getAllocatedMemory

public long getAllocatedMemory()

Description copied from interface: HalfStorageEngine

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

Specified by:

getAllocatedMemory in interface HalfStorageEngine<Integer>

Returns:

memory allocated for this engine in bytes

getOccupiedMemory

public long getOccupiedMemory()

Description copied from interface: HalfStorageEngine

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

Specified by:

getOccupiedMemory in interface HalfStorageEngine<Integer>

Returns:

memory occupied by this engine in bytes

getVitalMemory

public long getVitalMemory()

Description copied from interface: HalfStorageEngine

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

Specified by:

getVitalMemory in interface HalfStorageEngine<Integer>

Returns:

vital memory allocated for this engine in bytes

getDataSize

public long getDataSize()

Description copied from interface: HalfStorageEngine

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

Specified by:

getDataSize in interface HalfStorageEngine<Integer>

Returns:

size of the stored keys and values in bytes

invalidateCache

public void invalidateCache()

Description copied from interface: HalfStorageEngine

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 HalfStorageEngine<Integer>

bind

public void bind(StorageEngine.Owner owner,
                 long mask)

Specified by:

bind in interface HalfStorageEngine<Integer>

destroy

public void destroy()

Specified by:

destroy in interface HalfStorageEngine<Integer>

shrink

public boolean shrink()

Specified by:

shrink in interface HalfStorageEngine<Integer>