Package com.tangosol.net.partition

Class PartitionEvent

java.lang.Object

java.util.EventObject

com.tangosol.net.partition.PartitionEvent

All Implemented Interfaces:

Serializable

public class PartitionEvent
extends EventObject

The PartitionEvent carries information about an event related to one or more partitions.

Since:

Coherence 3.3

Author:

cp 2007.05.18

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected Member	m_memberFrom	The "from" member for events that represent transfer from a member.
protected Member	m_memberTo	The "to" member for events that represent transfer to a member.
protected int	m_nId	The event's id.
protected PartitionSet	m_setPartitions	The set of affected partitions.
static final int	PARTITION_ASSIGNED	This event indicates that the ownership of one or more partitions have been assigned to a service member.
static final int	PARTITION_LOST	This event indicates that one or more partitions have been lost.
static final int	PARTITION_RECEIVE_BEGIN	This event indicates that a transfer for one or more partitions is beginning and the data that belongs to partitions in the specified partition set are about to be inserted into corresponding backing maps.
static final int	PARTITION_RECEIVE_COMMIT	This event indicates that a transfer for one or more partitions has completed and the data that belong to these partitions have been inserted into corresponding backing maps.
static final int	PARTITION_RECOVERED	This event indicates that one or more partitions have been recovered by a service member.
static final int	PARTITION_TRANSMIT_BEGIN	This event indicates that data that belong to one or more partitions are about to be transferred to a different member.
static final int	PARTITION_TRANSMIT_COMMIT	This event indicates that data that belong to one or more partitions have been successfully transferred to a different member and all the data for that partition have been removed from this node.
static final int	PARTITION_TRANSMIT_ROLLBACK	This event indicates that a transfer for one or more partitions has been aborted (e.g. receiver's failure), and the partitions are now "owned" by this node again, and are about to be unfrozen.

Fields inherited from class java.util.EventObject

source

Constructor Summary

Constructors

Constructor	Description
PartitionEvent(PartitionedService svc, int nId, PartitionSet setPartitions, Member memberFrom, Member memberTo)	Construct a partition event.

Method Summary

Modifier and Type	Method	Description
protected String	getDescription()	Get the event's description.
static String	getDescription(int nId)	Convert an event ID into a human-readable string.
Member	getFromMember()	Determine the member that held the partitions prior to the action represented by this event.
int	getId()	Return this event's id.
PartitionSet	getPartitionSet()	Determine the set of partitions represented by this event.
PartitionedService	getService()	Determine the partitioned service that this event originates from.
Member	getToMember()	Determine the member that holds the partitions after the action represented by this event.
String	toString()	Return a String representation of this PartitionEvent object.

Methods inherited from class java.util.EventObject

getSource

Methods inherited from class java.lang.Object

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

Field Details

PARTITION_LOST

public static final int PARTITION_LOST

This event indicates that one or more partitions have been lost. When a partition is lost, its ownership is re-assigned to an existing member, on which this event is then raised. By default, the partition is assigned to the senior ownership-enabled member running the partitioned service. For the PARTITION_LOST event, the partition set and "to member" will always be non-null.

As of Coherence 3.6, a restart of an ownership-enabled member after the loss of all ownership-enabled members is indistinguishable from a fresh service start. In such a scenario, the PARTITION_ASSIGNED event is raised.

Since:

Coherence 3.3

See Also:

• Constant Field Values

PARTITION_TRANSMIT_BEGIN

public static final int PARTITION_TRANSMIT_BEGIN

This event indicates that data that belong to one or more partitions are about to be transferred to a different member. When this event is raised, the partitions have been frozen (no changes can occur to data managed within that partitions) and they have been "unowned".

Since:

Coherence 3.5

See Also:

• Constant Field Values

PARTITION_TRANSMIT_COMMIT

public static final int PARTITION_TRANSMIT_COMMIT

This event indicates that data that belong to one or more partitions have been successfully transferred to a different member and all the data for that partition have been removed from this node.

Since:

Coherence 3.5

See Also:

• Constant Field Values

PARTITION_TRANSMIT_ROLLBACK

public static final int PARTITION_TRANSMIT_ROLLBACK

This event indicates that a transfer for one or more partitions has been aborted (e.g. receiver's failure), and the partitions are now "owned" by this node again, and are about to be unfrozen.

Since:

Coherence 3.5

See Also:

• Constant Field Values

PARTITION_RECEIVE_BEGIN

public static final int PARTITION_RECEIVE_BEGIN

This event indicates that a transfer for one or more partitions is beginning and the data that belongs to partitions in the specified partition set are about to be inserted into corresponding backing maps. When this is event is raised, this node is not yet an owner for these partitions.

Note: if this event is raised as a result of a recovery from the backup during failover, the "member from" property will be null.

Since:

Coherence 3.5

See Also:

• Constant Field Values

PARTITION_RECEIVE_COMMIT

public static final int PARTITION_RECEIVE_COMMIT

This event indicates that a transfer for one or more partitions has completed and the data that belong to these partitions have been inserted into corresponding backing maps. This event is raised immediately before this node becomes the partition owner.

Note: if this event is raised as a result of a recovery from the backup during failover, the "member from" property will be null.

Since:

Coherence 3.5

See Also:

• Constant Field Values

PARTITION_ASSIGNED

public static final int PARTITION_ASSIGNED

This event indicates that the ownership of one or more partitions have been assigned to a service member. Partitions are initially assigned when the first ownership-enabled member joins the service, at which time this event is raised. By default, the partition is assigned to the senior ownership-enabled member running the partitioned service. For the PARTITION_ASSIGNED event, the partition set and "to member" will always be non-null.

Since:

Coherence 3.6

See Also:

• Constant Field Values

PARTITION_RECOVERED

public static final int PARTITION_RECOVERED

This event indicates that one or more partitions have been recovered by a service member. Partitions are recovered from persistent storage when neither the primary nor any backup owners exist (e.g. during service startup or following the departure of all owners) and a persistent copy is located by the configured PersistenceEnvironment. For the PARTITION_RECOVERED event, the partition set and "to member" will always be non-null.

Since:

Coherence 12.1.3

See Also:

• Constant Field Values

m_nId

protected int m_nId

The event's id.

m_setPartitions

protected PartitionSet m_setPartitions

The set of affected partitions.

m_memberFrom

protected Member m_memberFrom

The "from" member for events that represent transfer from a member.

m_memberTo

protected Member m_memberTo

The "to" member for events that represent transfer to a member.

Constructor Details

PartitionEvent

public PartitionEvent(PartitionedService svc,
 int nId,
 PartitionSet setPartitions,
 Member memberFrom,
 Member memberTo)

Construct a partition event.

Parameters:

svc - the service raising this event

nId - the event ID, one of the PARTITION_* constants

setPartitions - the set of partitions represented by this event; may be null

memberFrom - the member that held the partitions prior to the action represented by this event; may be null

memberTo - the member that holds the partitions after the action represented by this event; may be null

Method Details

getService

public PartitionedService getService()

Determine the partitioned service that this event originates from.

Returns:

the originating service

getId

public int getId()

Return this event's id. The event id is one of the PARTITION_* enumerated constants.

It is expected that new event IDs will be added to subsequent versions. Listener implementations that process partition events should only deal with event objects that have specific, known event IDs, and ignore all others.

Returns:

the event id

getPartitionSet

public PartitionSet getPartitionSet()

Determine the set of partitions represented by this event.

Returns:

the PartitionSet containing the partition identifiers represented by this event; may be null

getFromMember

public Member getFromMember()

Determine the member that held the partitions prior to the action represented by this event.

Returns:

the "from" Member for the partitions; may be null

getToMember

public Member getToMember()

Determine the member that holds the partitions after the action represented by this event.

Returns:

the "to" Member for the partitions; may be null

getDescription

protected String getDescription()

Get the event's description.

Returns:

this event's description

getDescription

public static String getDescription(int nId)

Convert an event ID into a human-readable string.

Parameters:

nId - an event ID, one of the PARTITION_* enumerated values

Returns:

a corresponding human-readable string, for example "lost"

toString

public String toString()

Return a String representation of this PartitionEvent object.

Overrides:

toString in class EventObject

Returns:

a human-readable description of the PartitionEvent