de.saxsys.synchronizefx.core.metamodel.executors.lists

Class ReparingListPropertyCommandExecutor

java.lang.Object

de.saxsys.synchronizefx.core.metamodel.executors.lists.ReparingListPropertyCommandExecutor

All Implemented Interfaces:

ListPropertyCommandExecutor

public class ReparingListPropertyCommandExecutor
extends Object
implements ListPropertyCommandExecutor

Manages the repairing and executing respectively re-sending of local and remote commands.

Incoming remote commands need to be repaired if other changes where made on the local list. This class initiates repairing of these command before executing them. Remote commands that do not need repair are executed directly.

When a remote command appears while unconfirmed local commands exists, other peers will drop all these local commands. They therefore have to be repaired as well to be based on the list version the remote command produced and re-send to the other peers.

A local command gets confirmed when it is the same as a received remote command and if it is the oldest unconfirmed command.

Author:

Raik Bieniek

Constructor Summary

Constructors

Constructor and Description
ReparingListPropertyCommandExecutor(ListPropertyMetaDataStore listMetaDataStore, ListCommandIndexRepairer indexRepairer, ListCommandVersionRepairer versionRepairer, SimpleListPropertyCommandExecutor simpleExecutor, TopologyLayerCallback topologyLayerCallback) Initializes an instance with all its dependencies.

Method Summary

Methods

Modifier and Type	Method and Description
void	execute(AddToList command) Executes an command that was received from an other peer if appropriate.
void	execute(RemoveFromList command) Executes an command that was received from an other peer if appropriate.
void	execute(ReplaceInList command) Executes an command that was received from an other peer if appropriate.
void	logLocalCommand(ListCommand localCommand) Logs a command that was locally generated and send to other peers.

Methods inherited from class java.lang.Object

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

Constructor Detail

ReparingListPropertyCommandExecutor

public ReparingListPropertyCommandExecutor(ListPropertyMetaDataStore listMetaDataStore,
                                   ListCommandIndexRepairer indexRepairer,
                                   ListCommandVersionRepairer versionRepairer,
                                   SimpleListPropertyCommandExecutor simpleExecutor,
                                   TopologyLayerCallback topologyLayerCallback)

Initializes an instance with all its dependencies.

Parameters:

listMetaDataStore - Used to read and update versions of Lists.

indexRepairer - Used to repair the indices of remote and local commands.

versionRepairer - Used to repair the version of remote and local commands.

simpleExecutor - Used to execute changes on Lists.

topologyLayerCallback - Used to re-send repaired local commands.

Method Detail

execute

public void execute(AddToList command)

Description copied from interface: ListPropertyCommandExecutor

Executes an command that was received from an other peer if appropriate.

Specified by:

execute in interface ListPropertyCommandExecutor

Parameters:

command - The received command.

execute

public void execute(RemoveFromList command)

Description copied from interface: ListPropertyCommandExecutor

Executes an command that was received from an other peer if appropriate.

Specified by:

execute in interface ListPropertyCommandExecutor

Parameters:

command - The received command.

execute

public void execute(ReplaceInList command)

Description copied from interface: ListPropertyCommandExecutor

Executes an command that was received from an other peer if appropriate.

Specified by:

execute in interface ListPropertyCommandExecutor

Parameters:

command - The received command.

logLocalCommand

public void logLocalCommand(ListCommand localCommand)

Logs a command that was locally generated and send to other peers.

Parameters:

localCommand - The command to log