Java Doc for ReplicationProcess.java in  » Database-DBMS » db4o-6.4 » com » db4o » replication » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » db4o 6.4 » com.db4o.replication 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


com.db4o.replication.ReplicationProcess

All known Subclasses:   com.db4o.ReplicationImpl,
ReplicationProcess
public interface ReplicationProcess (Code)

See Also:   com.db4o.ext.ExtObjectContainer.replicationBegin(ObjectContainerReplicationConflictHandler)




Method Summary
public  voidcheckConflict(Object obj)
     checks if an object has been modified in both ObjectContainers involved in the replication process since the last time the two ObjectContainers were replicated.
public  voidcommit()
     commits the replication task to both involved ObjectContainers.

Call this method after replication is completed to write all changes back to the database files.
public  ObjectContainerpeerA()
     returns the "peerA" ObjectContainer involved in this ReplicationProcess.
public  ObjectContainerpeerB()
     returns the "peerB" ObjectContainer involved in this ReplicationProcess.
public  voidreplicate(Object obj)
     replicates an object.

By default the version number of the object is checked in both ObjectContainers involved in the replication process.
public  voidrollback()
     ends a replication task without committing any changes.
public  voidsetDirection(ObjectContainer relicateFrom, ObjectContainer replicateTo)
     modifies the replication policy, what to do on a call to ReplicationProcess.replicate(Object) .
public  voidwhereModified(Query query)
     adds a constraint to the passed Query to query only for objects that were modified since the last replication process between the two ObjectContainers involved in this replication process.



Method Detail
checkConflict
public void checkConflict(Object obj)(Code)
checks if an object has been modified in both ObjectContainers involved in the replication process since the last time the two ObjectContainers were replicated.
Parameters:
  obj - - the object to check for a conflict.



commit
public void commit()(Code)
commits the replication task to both involved ObjectContainers.

Call this method after replication is completed to write all changes back to the database files. This method synchronizes both ObjectContainers by setting the transaction serial number com.db4o.ext.ExtObjectContainer.version on both ObjectContainers to be equal to the higher version number among the two. A record with information about this replication task, including the synchronized version number is stored to both ObjectContainers to allow future incremental replication.



peerA
public ObjectContainer peerA()(Code)
returns the "peerA" ObjectContainer involved in this ReplicationProcess.



peerB
public ObjectContainer peerB()(Code)
returns the "peerB" ObjectContainer involved in this ReplicationProcess.



replicate
public void replicate(Object obj)(Code)
replicates an object.

By default the version number of the object is checked in both ObjectContainers involved in the replication process. If the version number has not changed since the last time the two ObjectContainers were replicated
Parameters:
  obj -



rollback
public void rollback()(Code)
ends a replication task without committing any changes.



setDirection
public void setDirection(ObjectContainer relicateFrom, ObjectContainer replicateTo)(Code)
modifies the replication policy, what to do on a call to ReplicationProcess.replicate(Object) .

If no direction is set, the replication process will be bidirectional by default.
Parameters:
  relicateFrom - the ObjectContainer to replicate from
Parameters:
  replicateTo - the ObjectContainer to replicate to



whereModified
public void whereModified(Query query)(Code)
adds a constraint to the passed Query to query only for objects that were modified since the last replication process between the two ObjectContainers involved in this replication process.
Parameters:
  query - the Query to be constrained



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