net.sf.ehcache.transaction
Class AbstractTransactionStore

java.lang.Object
  net.sf.ehcache.store.AbstractStore
      net.sf.ehcache.transaction.AbstractTransactionStore

All Implemented Interfaces:

Store, TerracottaStore

Direct Known Subclasses:

JtaLocalTransactionStore, LocalTransactionStore, XATransactionStore

public abstract class AbstractTransactionStore
extends AbstractStore
implements TerracottaStore

Abstract transactional store which provides implementation of all non-transactional methods

Author:

Ludovic Orban

Field Summary

protected ReadWriteCopyStrategy<Element>	copyStrategy The copy strategy for this store
protected Store	underlyingStore The underlying store wrapped by this store

Fields inherited from class net.sf.ehcache.store.AbstractStore

attributeExtractors

Fields inherited from interface net.sf.ehcache.store.Store

CLUSTER_COHERENT, NODE_COHERENT

Constructor Summary

protected

AbstractTransactionStore(Store underlyingStore, ReadWriteCopyStrategy<Element> copyStrategy) Constructor

Method Summary

boolean	bufferFull() Some store types, such as the disk stores can fill their write buffers if puts come in too fast.
boolean	containsKeyInMemory(Object key) A check to see if a key is in the Store and is currently held in memory.
boolean	containsKeyOffHeap(Object key) A check to see if a key is in the Store and is currently held off-heap.
boolean	containsKeyOnDisk(Object key) A check to see if a key is in the Store and is currently held on disk.
protected Element	copyElementForRead(Element element) Copy element for read operation
protected Element	copyElementForWrite(Element element) Copy element for write operation
WriteBehind	createWriteBehind() WriteBehind createWriteBehind
void	dispose() Prepares for shutdown.
Results	executeQuery(StoreQuery query) Execute the given query on this store
void	expireElements() Expire all elements.
void	flush() Flush elements to persistent store.
Policy	getInMemoryEvictionPolicy()
int	getInMemorySize() Returns the current local in-memory store size
long	getInMemorySizeInBytes() Gets the size of the in-memory portion of the store, in bytes.
Object	getInternalContext() This should not be used, and will generally return null
Set	getLocalKeys() Returns set of keys from the cache which are present in the node locally.
Object	getMBean() Optional implementation specific MBean exposed by the store.
int	getOffHeapSize() Returns the current local off-heap store size
long	getOffHeapSizeInBytes() Gets the size of the off-heap portion of the store, in bytes.
int	getOnDiskSize() Returns the current local on-disk store size
long	getOnDiskSizeInBytes() Gets the size of the on-disk portion of the store, in bytes.
<T> Attribute<T>	getSearchAttribute(String attributeName) Retrieve the given named search attribute
Status	getStatus() Returns the cache status.
CacheConfiguration.TransactionalMode	getTransactionalMode() Get the transactional mode of this store.
boolean	hasAbortedSizeOf() Checks if the cache may contain elements for which the SizeOf engine gave up and only partially calculated the size.
boolean	isCacheCoherent() Indicates whether this store provides a coherent view of all the elements in a cache.
boolean	isClusterCoherent() Returns true if the cache is in coherent mode cluster-wide.
boolean	isNodeCoherent() Returns true if the cache is in coherent mode for the current node.
void	notifyCacheEventListenersChanged() Notify the underlying store that some change has occured in the set of registered cache listeners.
void	setAttributeExtractors(Map<String,AttributeExtractor> extractors) Inform this store of the configured attribute extractors.
void	setInMemoryEvictionPolicy(Policy policy) Sets the eviction policy strategy.
void	setNodeCoherent(boolean coherent) Sets the cache in coherent or incoherent mode for the current node depending on the parameter.
Element	unsafeGet(Object key) Returns the local value associated with the key.
void	waitUntilClusterCoherent() This method waits until the cache is in coherent mode in all the connected nodes.

Methods inherited from class net.sf.ehcache.store.AbstractStore

addStoreListener, getAll, getAllQuiet, getEventListenerList, putAll, recalculateSize, removeAll, removeStoreListener

Methods inherited from class java.lang.Object

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

Methods inherited from interface net.sf.ehcache.store.Store

addStoreListener, containsKey, get, getAll, getAllQuiet, getKeys, getQuiet, getSize, getTerracottaClusteredSize, put, putAll, putIfAbsent, putWithWriter, recalculateSize, remove, removeAll, removeAll, removeElement, removeStoreListener, removeWithWriter, replace, replace

Field Detail

underlyingStore

protected final Store underlyingStore

The underlying store wrapped by this store

copyStrategy

protected final ReadWriteCopyStrategy<Element> copyStrategy

The copy strategy for this store

Constructor Detail

AbstractTransactionStore

protected AbstractTransactionStore(Store underlyingStore,
                                   ReadWriteCopyStrategy<Element> copyStrategy)

Constructor

Parameters:

underlyingStore - the underlying store

Method Detail

copyElementForRead

protected Element copyElementForRead(Element element)

Copy element for read operation

Parameters:

element -

Returns:

copied element

copyElementForWrite

protected Element copyElementForWrite(Element element)

Copy element for write operation

Parameters:

element -

Returns:

copied element

executeQuery

public Results executeQuery(StoreQuery query)

Execute the given query on this store

Specified by:

executeQuery in interface Store

Overrides:

executeQuery in class AbstractStore

Parameters:

query - query to execute

Returns:

query results

getInMemorySize

public int getInMemorySize()

Returns the current local in-memory store size

Specified by:

getInMemorySize in interface Store

Returns:

the count of the Elements in the Store and in-memory on the local machine

getOffHeapSize

public int getOffHeapSize()

Returns the current local off-heap store size

Specified by:

getOffHeapSize in interface Store

Returns:

the count of the Elements in the Store and off-heap on the local machine

getOnDiskSize

public int getOnDiskSize()

Returns the current local on-disk store size

Specified by:

getOnDiskSize in interface Store

Returns:

the count of the Elements in the Store and on-disk on the local machine

getInMemorySizeInBytes

public long getInMemorySizeInBytes()

Gets the size of the in-memory portion of the store, in bytes.

This method may be expensive to run, depending on implementation. Implementers may choose to return an approximate size.

Specified by:

getInMemorySizeInBytes in interface Store

Returns:

the approximate in-memory size of the store in bytes

getOffHeapSizeInBytes

public long getOffHeapSizeInBytes()

Gets the size of the off-heap portion of the store, in bytes.

Specified by:

getOffHeapSizeInBytes in interface Store

Returns:

the approximate off-heap size of the store in bytes

getOnDiskSizeInBytes

public long getOnDiskSizeInBytes()

Gets the size of the on-disk portion of the store, in bytes.

Specified by:

getOnDiskSizeInBytes in interface Store

Returns:

the on-disk size of the store in bytes

containsKeyOnDisk

public boolean containsKeyOnDisk(Object key)

A check to see if a key is in the Store and is currently held on disk.

Specified by:

containsKeyOnDisk in interface Store

Parameters:

key - The Element key

Returns:

true if found. No check is made to see if the Element is expired.

containsKeyOffHeap

public boolean containsKeyOffHeap(Object key)

A check to see if a key is in the Store and is currently held off-heap.

Specified by:

containsKeyOffHeap in interface Store

Parameters:

key - The Element key

Returns:

true if found. No check is made to see if the Element is expired.

containsKeyInMemory

public boolean containsKeyInMemory(Object key)

A check to see if a key is in the Store and is currently held in memory.

Specified by:

containsKeyInMemory in interface Store

Parameters:

key - The Element key

Returns:

true if found. No check is made to see if the Element is expired.

dispose

public void dispose()

Prepares for shutdown.

Specified by:

dispose in interface Store

getStatus

public Status getStatus()

Returns the cache status.

Specified by:

getStatus in interface Store

expireElements

public void expireElements()

Expire all elements.

Specified by:

expireElements in interface Store

flush

public void flush()
           throws IOException

Flush elements to persistent store.

Specified by:

flush in interface Store

Throws:

IOException - if any IO error occurs

bufferFull

public boolean bufferFull()

Some store types, such as the disk stores can fill their write buffers if puts come in too fast. The thread will wait for a short time before checking again.

Specified by:

bufferFull in interface Store

Returns:

true if the store write buffer is backed up.

getInMemoryEvictionPolicy

public Policy getInMemoryEvictionPolicy()

Specified by:

getInMemoryEvictionPolicy in interface Store

Returns:

the current eviction policy. This may not be the configured policy, if it has been dynamically set.

See Also:

Store.setInMemoryEvictionPolicy(Policy)

setInMemoryEvictionPolicy

public void setInMemoryEvictionPolicy(Policy policy)

Sets the eviction policy strategy. The Store will use a policy at startup. The store may allow changing the eviction policy strategy dynamically. Otherwise implementations will throw an exception if this method is called.

Specified by:

setInMemoryEvictionPolicy in interface Store

Parameters:

policy - the new policy

getInternalContext

public Object getInternalContext()

This should not be used, and will generally return null

Specified by:

getInternalContext in interface Store

Returns:

some internal context (probably null)

getMBean

public Object getMBean()

Optional implementation specific MBean exposed by the store.

Specified by:

getMBean in interface Store

Returns:

implementation specific management bean

setNodeCoherent

public void setNodeCoherent(boolean coherent)

Sets the cache in coherent or incoherent mode for the current node depending on the parameter. Calling setNodeCoherent(true) when the cache is already in coherent mode or calling setNodeCoherent(false) when already in incoherent mode will be a no-op.

It applies to coherent clustering mechanisms only e.g. Terracotta

Specified by:

setNodeCoherent in interface Store

Overrides:

setNodeCoherent in class AbstractStore

Parameters:

coherent - true transitions to coherent mode, false to incoherent mode

See Also:

Store.setNodeCoherent(boolean)

isNodeCoherent

public boolean isNodeCoherent()

Returns true if the cache is in coherent mode for the current node. Returns false otherwise.

It applies to coherent clustering mechanisms only e.g. Terracotta

Specified by:

isNodeCoherent in interface Store

Overrides:

isNodeCoherent in class AbstractStore

Returns:

true if the cache is in coherent mode cluster-wide, false otherwise

See Also:

Store.isNodeCoherent()

isCacheCoherent

public boolean isCacheCoherent()

Indicates whether this store provides a coherent view of all the elements in a cache. Note that this is same as calling Store.isClusterCoherent() (introduced since 2.0) Use Store.isNodeCoherent() to find out if the cache is coherent in the current node in the cluster

Specified by:

isCacheCoherent in interface Store

Overrides:

isCacheCoherent in class AbstractStore

Returns:

true if the store is coherent; or false if the store potentially splits the cache storage with another store or isn't internally coherent

See Also:

Store.isCacheCoherent()

isClusterCoherent

public boolean isClusterCoherent()

Returns true if the cache is in coherent mode cluster-wide. Returns false otherwise.

It applies to coherent clustering mechanisms only e.g. Terracotta

Specified by:

isClusterCoherent in interface Store

Overrides:

isClusterCoherent in class AbstractStore

Returns:

true if the cache is in coherent mode cluster-wide, false otherwise

See Also:

Store.isClusterCoherent()

waitUntilClusterCoherent

public void waitUntilClusterCoherent()
                              throws TerracottaNotRunningException,
                                     UnsupportedOperationException,
                                     InterruptedException

This method waits until the cache is in coherent mode in all the connected nodes. If the cache is already in coherent mode it returns immediately

It applies to coherent clustering mechanisms only e.g. Terracotta

Specified by:

waitUntilClusterCoherent in interface Store

Overrides:

waitUntilClusterCoherent in class AbstractStore

Throws:

InterruptedException

UnsupportedOperationException

TerracottaNotRunningException

See Also:

Store.waitUntilClusterCoherent()

setAttributeExtractors

public void setAttributeExtractors(Map<String,AttributeExtractor> extractors)

Inform this store of the configured attribute extractors. Stores that will not invoke extractors are free to ignore this call

Specified by:

setAttributeExtractors in interface Store

Overrides:

setAttributeExtractors in class AbstractStore

getSearchAttribute

public <T> Attribute<T> getSearchAttribute(String attributeName)
                                throws CacheException

Retrieve the given named search attribute

Specified by:

getSearchAttribute in interface Store

Overrides:

getSearchAttribute in class AbstractStore

Type Parameters:

T - type of the attribute

Parameters:

attributeName - the name of the attribute to retrieve

Returns:

the search attribute or null if non-existent

Throws:

CacheException

hasAbortedSizeOf

public boolean hasAbortedSizeOf()

Checks if the cache may contain elements for which the SizeOf engine gave up and only partially calculated the size.

Specified by:

hasAbortedSizeOf in interface Store

Overrides:

hasAbortedSizeOf in class AbstractStore

Returns:

true if at least one partially sized element may be in the cache

unsafeGet

public Element unsafeGet(Object key)

Returns the local value associated with the key. Local value means that the object mapped to the key is present in the VM locally. In case its not, will return null. Note that even when returning null, the value may be present in the Terracotta server array.

This operation does not acquire any locks when doing the operation and may return stale values. This Operation does not update last usage statistics

Specified by:

unsafeGet in interface TerracottaStore

Parameters:

key - the key

Returns:

the element associated with key or null

getLocalKeys

public Set getLocalKeys()

Returns set of keys from the cache which are present in the node locally.

Specified by:

getLocalKeys in interface TerracottaStore

Returns:

set of keys present locally in the node

getTransactionalMode

public CacheConfiguration.TransactionalMode getTransactionalMode()

Get the transactional mode of this store. The returned value is the String value of CacheConfiguration.TransactionalMode.

Specified by:

getTransactionalMode in interface TerracottaStore

Returns:

a String representation of this store's transactional mode.

See Also:

CacheConfiguration.TransactionalMode

createWriteBehind

public WriteBehind createWriteBehind()

Description copied from interface: TerracottaStore

WriteBehind createWriteBehind

Specified by:

createWriteBehind in interface TerracottaStore

notifyCacheEventListenersChanged

public void notifyCacheEventListenersChanged()

Description copied from interface: TerracottaStore

Notify the underlying store that some change has occured in the set of registered cache listeners.

Specified by:

notifyCacheEventListenersChanged in interface TerracottaStore