org.infinispan.container.entries

Class ReadCommittedEntry

java.lang.Object

org.infinispan.container.entries.ReadCommittedEntry

All Implemented Interfaces:

Map.Entry<Object,Object>, CacheEntry, MVCCEntry, Versioned

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

Nested Classes

Modifier and Type	Class and Description
protected static class	ReadCommittedEntry.Flags

Field Summary

Fields

Modifier and Type	Field and Description
protected byte	flags
protected Object	key
protected Object	oldValue
protected Object	value

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	ReadCommittedEntry()
	ReadCommittedEntry(Object key, Object value, EntryVersion version, long lifespan)

Method Summary

Methods

Modifier and Type	Method and Description
void	commit(DataContainer container, EntryVersion newVersion) Commits changes
void	copyForUpdate(DataContainer container, boolean writeSkewCheck) Makes internal copies of the entry for updates
Object	getKey() Retrieves the key to this entry
long	getLifespan()
long	getMaxIdle()
Object	getValue() Retrieves the value of this entry
EntryVersion	getVersion()
boolean	isChanged()
boolean	isCreated()
boolean	isEvicted()
protected boolean	isFlagSet(ReadCommittedEntry.Flags flag) Tests whether a flag is set.
boolean	isLockPlaceholder()
boolean	isNull() Tests whether the entry represents a null value, typically used for repeatable read.
boolean	isRemoved()
boolean	isValid()
void	rollback() Rolls back changes
protected void	setChanged()
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	setLifespan(long lifespan) Sets the lifespan of the entry.
void	setLockPlaceholder(boolean placeholder) Marks an entry as a lock placeholder
void	setMaxIdle(long maxIdle) Sets the maximum idle time of the entry.
void	setRemoved(boolean removed)
void	setValid(boolean valid)
Object	setValue(Object value) Sets the value of the entry, returning the previous value
void	setVersion(EntryVersion version) Sets the version on this entry.
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

Constructor Detail

ReadCommittedEntry

protected ReadCommittedEntry()

ReadCommittedEntry

public ReadCommittedEntry(Object key,
                  Object value,
                  EntryVersion version,
                  long lifespan)

Method Detail

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.

setMaxIdle

public final void setMaxIdle(long maxIdle)

Description copied from interface: CacheEntry

Sets the maximum idle time of the entry.

Specified by:

setMaxIdle in interface CacheEntry

Parameters:

maxIdle - maxIdle to set

setLifespan

public final void setLifespan(long lifespan)

Description copied from interface: CacheEntry

Sets the lifespan of the entry.

Specified by:

setLifespan in interface CacheEntry

Parameters:

lifespan - lifespan to set

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.

setLockPlaceholder

public void setLockPlaceholder(boolean placeholder)

Description copied from interface: MVCCEntry

Marks an entry as a lock placeholder

Specified by:

setLockPlaceholder in interface MVCCEntry

Parameters:

placeholder - if true, the entry is marked as a lock placeholder. If false, the entry is un-marked as a placeholder.

commit

public final void commit(DataContainer container,
          EntryVersion newVersion)

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

protected final void setChanged()

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

isLockPlaceholder

public boolean isLockPlaceholder()

Specified by:

isLockPlaceholder in interface CacheEntry

Returns:

true if this entry is a placeholder for the sake of acquiring a lock; and false if it is a real entry.

getVersion

public EntryVersion getVersion()

Specified by:

getVersion in interface Versioned

Returns:

the version of the entry. May be null if versioning is not supported, and must never be null if versioning is supported.

setVersion

public void setVersion(EntryVersion version)

Description copied from interface: Versioned

Sets the version on this entry.

Specified by:

setVersion in interface Versioned

Parameters:

version - version to set

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

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