org.jboss.cache
Class Modification

java.lang.Object
  org.jboss.cache.Modification

All Implemented Interfaces:

java.io.Externalizable, java.io.Serializable

public class Modification
extends java.lang.Object
implements java.io.Externalizable

Represents a modification in the cache. Contains the nature of the modification (e.g. PUT, REMOVE), the fqn of the node, the new value and the previous value. A list of modifications will be sent to all nodes in a cluster when a transaction has been committed (PREPARE phase). A Modification is also used to roll back changes, e.g. since we know the previous value, we can reconstruct the previous state by applying the changes in a modification listin reverse order.

Version:

$Revision: 1.2 $

Author:

Bela Ban Apr 12, 2003

See Also:

Serialized Form

Field Summary

static byte	PUT_DATA
static byte	PUT_DATA_ERASE
static byte	PUT_KEY_VALUE
static byte	REMOVE_DATA
static byte	REMOVE_KEY_VALUE
static byte	REMOVE_NODE

Constructor Summary

Modification()

Modification(byte type, Fqn fqn)

Modification(byte type, Fqn fqn, java.util.Map data)

Modification(byte type, Fqn fqn, java.lang.Object key)

Modification(byte type, Fqn fqn, java.lang.Object key, java.lang.Object value)

Method Summary

java.util.Map	getData()
Fqn	getFqn()
java.lang.Object	getKey()
java.lang.Object	getOldValue()
byte	getType()
java.lang.Object	getValue()
void	readExternal(java.io.ObjectInput in)
void	setData(java.util.Map data)
void	setFqn(Fqn fqn)
void	setKey(java.lang.Object key)
void	setOldValue(java.lang.Object old_value)
void	setType(byte type)
void	setValue(java.lang.Object value)
java.lang.String	toString()
void	writeExternal(java.io.ObjectOutput out)

Methods inherited from class java.lang.Object

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

Field Detail

PUT_KEY_VALUE

public static final byte PUT_KEY_VALUE

See Also:

Constant Field Values

PUT_DATA

public static final byte PUT_DATA

See Also:

Constant Field Values

PUT_DATA_ERASE

public static final byte PUT_DATA_ERASE

See Also:

Constant Field Values

REMOVE_NODE

public static final byte REMOVE_NODE

See Also:

Constant Field Values

REMOVE_KEY_VALUE

public static final byte REMOVE_KEY_VALUE

See Also:

Constant Field Values

REMOVE_DATA

public static final byte REMOVE_DATA

See Also:

Constant Field Values

Constructor Detail

Modification

public Modification()

Modification

public Modification(byte type,
                    Fqn fqn,
                    java.lang.Object key,
                    java.lang.Object value)

Modification

public Modification(byte type,
                    Fqn fqn,
                    java.lang.Object key)

Modification

public Modification(byte type,
                    Fqn fqn,
                    java.util.Map data)

Modification

public Modification(byte type,
                    Fqn fqn)

Method Detail

getType

public byte getType()

setType

public void setType(byte type)

getFqn

public Fqn getFqn()

setFqn

public void setFqn(Fqn fqn)

getKey

public java.lang.Object getKey()

setKey

public void setKey(java.lang.Object key)

getValue

public java.lang.Object getValue()

setValue

public void setValue(java.lang.Object value)

getOldValue

public java.lang.Object getOldValue()

setOldValue

public void setOldValue(java.lang.Object old_value)

getData

public java.util.Map getData()

setData

public void setData(java.util.Map data)

writeExternal

public void writeExternal(java.io.ObjectOutput out)
                   throws java.io.IOException

Specified by:

writeExternal in interface java.io.Externalizable

Throws:

java.io.IOException

readExternal

public void readExternal(java.io.ObjectInput in)
                  throws java.io.IOException,
                         java.lang.ClassNotFoundException

Specified by:

readExternal in interface java.io.Externalizable

Throws:

java.io.IOException

java.lang.ClassNotFoundException

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object