org.apache.axis2.clustering.configuration
Class ConfigurationClusteringCommand

java.lang.Object
  org.apache.axis2.clustering.ClusteringCommand
      org.apache.axis2.clustering.configuration.ConfigurationClusteringCommand

All Implemented Interfaces:

java.io.Serializable

Direct Known Subclasses:

ApplyServicePolicyCommand, CommitCommand, ExceptionCommand, LoadServiceGroupsCommand, PrepareCommand, ReloadConfigurationCommand, RollbackCommand, UnloadServiceGroupsCommand

public abstract class ConfigurationClusteringCommand
extends ClusteringCommand

This class represents the 2-phase commit protocol, where an event is processed, the system is prepared to switch to a new configuration based on the processed event, and finally commits the new configuration (i.e. the system switches to the new configuration). As can be seen, this is a 3-step process.

See Also:

Serialized Form

Field Summary

static int	APPLY_SERVICE_POLICY
static int	COMMIT
static int	EXCEPTION
static int	LOAD_SERVICE_GROUPS
static int	PREPARE
static int	RELOAD_CONFIGURATION
static int	ROLLBACK
static int	UNLOAD_SERVICE_GROUPS

Constructor Summary

ConfigurationClusteringCommand()

Method Summary

abstract void	commit(ConfigurationContext configContext) Commit the new configuration.
abstract int	getCommandType() Get the command type
abstract void	prepare(ConfigurationContext configContext) Prepare to switch to the new configuration
abstract void	process(ConfigurationContext configContext) Process the event.
abstract void	rollback(ConfigurationContext configContext) Rollback any changes carried out

Methods inherited from class java.lang.Object

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

Field Detail

RELOAD_CONFIGURATION

public static final int RELOAD_CONFIGURATION

See Also:

Constant Field Values

LOAD_SERVICE_GROUPS

public static final int LOAD_SERVICE_GROUPS

See Also:

Constant Field Values

UNLOAD_SERVICE_GROUPS

public static final int UNLOAD_SERVICE_GROUPS

See Also:

Constant Field Values

APPLY_SERVICE_POLICY

public static final int APPLY_SERVICE_POLICY

See Also:

Constant Field Values

PREPARE

public static final int PREPARE

See Also:

Constant Field Values

COMMIT

public static final int COMMIT

See Also:

Constant Field Values

EXCEPTION

public static final int EXCEPTION

See Also:

Constant Field Values

ROLLBACK

public static final int ROLLBACK

See Also:

Constant Field Values

Constructor Detail

ConfigurationClusteringCommand

public ConfigurationClusteringCommand()

Method Detail

getCommandType

public abstract int getCommandType()

Get the command type

Returns:

The command type

process

public abstract void process(ConfigurationContext configContext)
                      throws java.lang.Exception

Process the event. The implementer of this interface will need to cache the outcome of this processing.

Parameters:

configContext -

Throws:

java.lang.Exception

prepare

public abstract void prepare(ConfigurationContext configContext)

Prepare to switch to the new configuration

Parameters:

configContext -

commit

public abstract void commit(ConfigurationContext configContext)
                     throws java.lang.Exception

Commit the new configuration. i.e. switch the system to the new configuration

Parameters:

configContext -

Throws:

java.lang.Exception

rollback

public abstract void rollback(ConfigurationContext configContext)
                       throws java.lang.Exception

Rollback any changes carried out

Parameters:

configContext -

Throws:

java.lang.Exception