org.infinispan.container.entries
Class ReadCommittedEntry

java.lang.Object
  org.infinispan.container.entries.ReadCommittedEntry

All Implemented Interfaces:

Map.Entry<Object,Object>, CacheEntry, MetadataAware, MVCCEntry, StateChangingEntry

Direct Known Subclasses:

RepeatableReadEntry

public class ReadCommittedEntry
extends Object
implements MVCCEntry

A wrapper around a cached entry that encapsulates read committed semantics when writes are initiated, committed or rolled back.

Since:

4.0

Author:

Manik Surtani (manik@jboss.org)

Nested Class Summary

protected static class

ReadCommittedEntry.Flags

Field Summary

protected byte	flags
protected Object	key
protected Metadata	metadata
protected Object	oldValue
protected Object	value

Constructor Summary

ReadCommittedEntry(Object key, Object value, Metadata metadata)

Method Summary

void	commit(DataContainer container, Metadata providedMetadata) Commits changes
void	copyForUpdate(DataContainer container, boolean writeSkewCheck) Makes internal copies of the entry for updates
void	copyStateFlagsFrom(StateChangingEntry other)
Object	getKey() Retrieves the key to this entry
long	getLifespan()
long	getMaxIdle()
Metadata	getMetadata() Get metadata of this cache entry.
byte	getStateFlags()
Object	getValue() Retrieves the value of this entry
boolean	isChanged()
boolean	isCreated()
boolean	isEvicted()
protected boolean	isFlagSet(ReadCommittedEntry.Flags flag) Tests whether a flag is set.
boolean	isLoaded()
boolean	isNull() Tests whether the entry represents a null value, typically used for repeatable read.
boolean	isRemoved()
boolean	isValid()
void	rollback() Rolls back changes
void	setChanged(boolean changed)
void	setCreated(boolean created)
void	setEvicted(boolean evicted)
protected void	setFlag(ReadCommittedEntry.Flags flag) Utility method that sets the value of the given flag to true.
void	setLoaded(boolean loaded)
void	setMetadata(Metadata metadata) Set the metadata in the cache entry.
void	setRemoved(boolean removed)
void	setValid(boolean valid)
Object	setValue(Object value) Sets the value of the entry, returning the previous value
String	toString()
boolean	undelete(boolean doUndelete) If the entry is marked as removed and doUndelete==true then the "valid" flag is set to true and "removed" flag is set to false.
protected void	unsetFlag(ReadCommittedEntry.Flags flag) Utility method that sets the value of the flag to false.

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Map.Entry

equals, hashCode

Field Detail

key

protected Object key

value

protected Object value

oldValue

protected Object oldValue

flags

protected byte flags

metadata

protected Metadata metadata

Constructor Detail

ReadCommittedEntry

public ReadCommittedEntry(Object key,
                          Object value,
                          Metadata metadata)

Method Detail

getStateFlags

public byte getStateFlags()

Specified by:

getStateFlags in interface StateChangingEntry

copyStateFlagsFrom

public void copyStateFlagsFrom(StateChangingEntry other)

Specified by:

copyStateFlagsFrom in interface StateChangingEntry

isFlagSet

protected final boolean isFlagSet(ReadCommittedEntry.Flags flag)

Tests whether a flag is set.

Parameters:

flag - flag to test

Returns:

true if set, false otherwise.

setFlag

protected final void setFlag(ReadCommittedEntry.Flags flag)

Utility method that sets the value of the given flag to true.

Parameters:

flag - flag to set

unsetFlag

protected final void unsetFlag(ReadCommittedEntry.Flags flag)

Utility method that sets the value of the flag to false.

Parameters:

flag - flag to unset

getLifespan

public final long getLifespan()

Specified by:

getLifespan in interface CacheEntry

Returns:

retrieves the lifespan of this entry. -1 means an unlimited lifespan.

getMaxIdle

public final long getMaxIdle()

Specified by:

getMaxIdle in interface CacheEntry

Returns:

the maximum allowed time for which this entry can be idle, after which it is considered expired.

getKey

public final Object getKey()

Description copied from interface: CacheEntry

Retrieves the key to this entry

Specified by:

getKey in interface Map.Entry<Object,Object>

Specified by:

getKey in interface CacheEntry

Returns:

a key

getValue

public final Object getValue()

Description copied from interface: CacheEntry

Retrieves the value of this entry

Specified by:

getValue in interface Map.Entry<Object,Object>

Specified by:

getValue in interface CacheEntry

Returns:

the value of the entry

setValue

public final Object setValue(Object value)

Description copied from interface: CacheEntry

Sets the value of the entry, returning the previous value

Specified by:

setValue in interface Map.Entry<Object,Object>

Specified by:

setValue in interface CacheEntry

Parameters:

value - value to set

Returns:

previous value

isNull

public boolean isNull()

Description copied from interface: CacheEntry

Tests whether the entry represents a null value, typically used for repeatable read.

Specified by:

isNull in interface CacheEntry

Returns:

true if this represents a null, false otherwise.

copyForUpdate

public void copyForUpdate(DataContainer container,
                          boolean writeSkewCheck)

Description copied from interface: MVCCEntry

Makes internal copies of the entry for updates

Specified by:

copyForUpdate in interface MVCCEntry

Parameters:

container - data container

writeSkewCheck - if true, write skews are tested for and exceptions are thrown if detected. Only applicable to IsolationLevel.REPEATABLE_READ.

commit

public final void commit(DataContainer container,
                         Metadata providedMetadata)

Description copied from interface: CacheEntry

Commits changes

Specified by:

commit in interface CacheEntry

Parameters:

container - data container to commit to

rollback

public final void rollback()

Description copied from interface: CacheEntry

Rolls back changes

Specified by:

rollback in interface CacheEntry

isChanged

public final boolean isChanged()

Specified by:

isChanged in interface CacheEntry

Returns:

true if this entry has changed since being read from the container, false otherwise.

setChanged

public final void setChanged(boolean changed)

Specified by:

setChanged in interface CacheEntry

Specified by:

setChanged in interface MVCCEntry

isValid

public boolean isValid()

Specified by:

isValid in interface CacheEntry

Returns:

true if this entry is still valid, false otherwise.

setValid

public final void setValid(boolean valid)

Specified by:

setValid in interface CacheEntry

getMetadata

public Metadata getMetadata()

Description copied from interface: MetadataAware

Get metadata of this cache entry.

Specified by:

getMetadata in interface MetadataAware

Returns:

a Metadata instance

setMetadata

public void setMetadata(Metadata metadata)

Description copied from interface: MetadataAware

Set the metadata in the cache entry.

Specified by:

setMetadata in interface MetadataAware

Parameters:

metadata - to apply to the cache entry

isCreated

public final boolean isCreated()

Specified by:

isCreated in interface CacheEntry

Returns:

true if this entry has been newly created, false otherwise.

setCreated

public final void setCreated(boolean created)

Specified by:

setCreated in interface CacheEntry

isRemoved

public boolean isRemoved()

Specified by:

isRemoved in interface CacheEntry

Returns:

true if this entry has been removed since being read from the container, false otherwise.

isEvicted

public boolean isEvicted()

Specified by:

isEvicted in interface CacheEntry

Returns:

true if this entry has been evicted since being read from the container, false otherwise.

setRemoved

public final void setRemoved(boolean removed)

Specified by:

setRemoved in interface CacheEntry

setEvicted

public void setEvicted(boolean evicted)

Specified by:

setEvicted in interface CacheEntry

isLoaded

public boolean isLoaded()

Specified by:

isLoaded in interface CacheEntry

Returns:

true if the entry was loaded from a cache store.

setLoaded

public void setLoaded(boolean loaded)

Specified by:

setLoaded in interface CacheEntry

toString

public String toString()

Overrides:

toString in class Object

undelete

public boolean undelete(boolean doUndelete)

Description copied from interface: CacheEntry

If the entry is marked as removed and doUndelete==true then the "valid" flag is set to true and "removed" flag is set to false.

Specified by:

undelete in interface CacheEntry