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

java.lang.Object
  org.terracotta.offheapstore.storage.listener.AbstractListenableStorageEngine<K,V>
      org.terracotta.offheapstore.storage.PortabilityBasedStorageEngine<K,V>

All Implemented Interfaces:

BinaryStorageEngine, ListenableStorageEngine<K,V>, StorageEngine<K,V>

Direct Known Subclasses:

FileBackedStorageEngine, OffHeapBufferStorageEngine

public abstract class PortabilityBasedStorageEngine<K,V>
extends AbstractListenableStorageEngine<K,V>
implements StorageEngine<K,V>, BinaryStorageEngine

Author:

Chris Dennis

Nested Class Summary

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

StorageEngine.Owner

Field Summary

protected Portability<? super K>	keyPortability
protected Portability<? super V>	valuePortability

Constructor Summary

PortabilityBasedStorageEngine(Portability<? super K> keyPortability, Portability<? super V> valuePortability)
Creates a storage engine using the given allocator, and portabilities.

Method Summary

void	attachedMapping(long encoding, int hash, int metadata)
void	clear() Called to indicate that all keys and values are now free.
protected abstract void	clearInternal()
boolean	equalsBinaryKey(ByteBuffer binaryKey, long encoding)
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.
protected abstract void	free(long address)
void	freeMapping(long encoding, int hash, boolean removal) Called to indicate that the associated encoded value is no longer needed.
protected abstract WriteContext	getKeyWriteContext(long address)
protected abstract WriteContext	getValueWriteContext(long address)
void	invalidateCache() Invalidate any local key/value caches.
ByteBuffer	readBinaryKey(long encoding)
ByteBuffer	readBinaryValue(long encoding)
K	readKey(long encoding, int hashCode) Converts the supplied encoded key into its correct object form.
protected abstract ByteBuffer	readKeyBuffer(long address)
V	readValue(long encoding) Converts the supplied encoded value into its correct object form.
protected abstract ByteBuffer	readValueBuffer(long address)
Long	writeBinaryMapping(ByteBuffer[] binaryKey, ByteBuffer[] binaryValue, int pojoHash, int metadata)
Long	writeBinaryMapping(ByteBuffer binaryKey, ByteBuffer binaryValue, int pojoHash, int metadata)
Long	writeMapping(K key, V value, int hash, int metadata) Converts the supplied value object into it's encoded form.
protected abstract Long	writeMappingBuffers(ByteBuffer keyBuffer, ByteBuffer valueBuffer, int hash)
protected Long	writeMappingBuffersGathering(ByteBuffer[] keyBuffers, ByteBuffer[] valueBuffers, int hash)

Methods inherited from class org.terracotta.offheapstore.storage.listener.AbstractListenableStorageEngine

fireCleared, fireCopied, fireFreed, fireRecovered, fireWritten, hasListeners, hasRecoveryListeners, registerListener

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.terracotta.offheapstore.storage.StorageEngine

bind, destroy, getAllocatedMemory, getDataSize, getOccupiedMemory, getVitalMemory, shrink

Methods inherited from interface org.terracotta.offheapstore.storage.BinaryStorageEngine

readKeyHash

Field Detail

keyPortability

protected final Portability<? super K> keyPortability

valuePortability

protected final Portability<? super V> valuePortability

Constructor Detail

PortabilityBasedStorageEngine

public PortabilityBasedStorageEngine(Portability<? super K> keyPortability,
                                     Portability<? super V> valuePortability)

Creates a storage engine using the given allocator, and portabilities.

Parameters:

allocator - allocator used for storage allocation

keyPortability - key type portability

valuePortability - value type portability

Method Detail

writeMapping

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

Description copied from interface: StorageEngine

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

Specified by:

writeMapping in interface StorageEngine<K,V>

value - a value object

Returns:

encoded value

attachedMapping

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

Specified by:

attachedMapping in interface StorageEngine<K,V>

freeMapping

public final 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

clear

public final 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>

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

readBinaryKey

public ByteBuffer readBinaryKey(long encoding)

Specified by:

readBinaryKey in interface BinaryStorageEngine

readBinaryValue

public ByteBuffer readBinaryValue(long encoding)

Specified by:

readBinaryValue in interface BinaryStorageEngine

equalsBinaryKey

public boolean equalsBinaryKey(ByteBuffer binaryKey,
                               long encoding)

Specified by:

equalsBinaryKey in interface BinaryStorageEngine

writeBinaryMapping

public Long writeBinaryMapping(ByteBuffer[] binaryKey,
                               ByteBuffer[] binaryValue,
                               int pojoHash,
                               int metadata)

Specified by:

writeBinaryMapping in interface BinaryStorageEngine

writeBinaryMapping

public Long writeBinaryMapping(ByteBuffer binaryKey,
                               ByteBuffer binaryValue,
                               int pojoHash,
                               int metadata)

Specified by:

writeBinaryMapping in interface BinaryStorageEngine

writeMappingBuffersGathering

protected Long writeMappingBuffersGathering(ByteBuffer[] keyBuffers,
                                            ByteBuffer[] valueBuffers,
                                            int hash)

free

protected abstract void free(long address)

clearInternal

protected abstract void clearInternal()

readKeyBuffer

protected abstract ByteBuffer readKeyBuffer(long address)

getKeyWriteContext

protected abstract WriteContext getKeyWriteContext(long address)

readValueBuffer

protected abstract ByteBuffer readValueBuffer(long address)

getValueWriteContext

protected abstract WriteContext getValueWriteContext(long address)

writeMappingBuffers

protected abstract Long writeMappingBuffers(ByteBuffer keyBuffer,
                                            ByteBuffer valueBuffer,
                                            int hash)

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>