org.apache.ambari.server.view

Class ViewDataMigrationUtility

java.lang.Object

org.apache.ambari.server.view.ViewDataMigrationUtility

public class ViewDataMigrationUtility
extends Object

Helper class for view data migration.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ViewDataMigrationUtility.CopyAllDataMigrator The data migrator implementation that copies all data without modification.

Constructor Summary

Constructors

Constructor and Description
ViewDataMigrationUtility(ViewRegistry viewRegistry) Constructor.

Method Summary

Modifier and Type	Method and Description
protected ViewDataMigrationContextImpl	getViewDataMigrationContext(ViewInstanceEntity targetInstanceDefinition, ViewInstanceEntity sourceInstanceDefinition) Create the data migration context for DataMigrator to access data of current and origin instances.
protected org.apache.ambari.view.migration.ViewDataMigrator	getViewDataMigrator(ViewInstanceEntity currentInstanceDefinition, ViewDataMigrationContextImpl migrationContext) Get the migrator instance for view instance with injected migration context.
void	migrateData(ViewInstanceEntity targetInstanceDefinition, ViewInstanceEntity sourceInstanceDefinition, boolean migrateOnce) Migrates data from source to target instance

Methods inherited from class java.lang.Object

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

Constructor Detail

ViewDataMigrationUtility

public ViewDataMigrationUtility(ViewRegistry viewRegistry)

Constructor.

Parameters:

viewRegistry - the view registry

Method Detail

migrateData

public void migrateData(ViewInstanceEntity targetInstanceDefinition,
                        ViewInstanceEntity sourceInstanceDefinition,
                        boolean migrateOnce)
                 throws org.apache.ambari.view.migration.ViewDataMigrationException

Migrates data from source to target instance

Parameters:

targetInstanceDefinition - target instance entity

sourceInstanceDefinition - source instance entity

migrateOnce - cancel if previously migrated

Throws:

org.apache.ambari.view.migration.ViewDataMigrationException - when view does not support migration or an error during migration occurs.

getViewDataMigrationContext

protected ViewDataMigrationContextImpl getViewDataMigrationContext(ViewInstanceEntity targetInstanceDefinition,
                                                                   ViewInstanceEntity sourceInstanceDefinition)

Create the data migration context for DataMigrator to access data of current and origin instances.

Parameters:

targetInstanceDefinition - target instance definition

sourceInstanceDefinition - source instance definition

Returns:

data migration context

getViewDataMigrator

protected org.apache.ambari.view.migration.ViewDataMigrator getViewDataMigrator(ViewInstanceEntity currentInstanceDefinition,
                                                                                ViewDataMigrationContextImpl migrationContext)
                                                                         throws org.apache.ambari.view.migration.ViewDataMigrationException

Get the migrator instance for view instance with injected migration context. If versions of instances are same returns copy-all-data migrator. If versions are different, loads the migrator from the current view (view should contain ViewDataMigrator implementation, otherwise exception will be raised).

Parameters:

currentInstanceDefinition - the current view instance definition

migrationContext - the migration context to inject into migrator

Returns:

the data migration instance

Throws:

org.apache.ambari.view.migration.ViewDataMigrationException - if view does not support migration