org.apache.cassandra.schema

Interface SchemaTransformation

All Known Implementing Classes:

AlterKeyspaceStatement, AlterSchemaStatement, AlterTableStatement, AlterTableStatement.AlterColumn, AlterTypeStatement, AlterViewStatement, CreateAggregateStatement, CreateFunctionStatement, CreateIndexStatement, CreateKeyspaceStatement, CreateTableStatement, CreateTriggerStatement, CreateTypeStatement, CreateViewStatement, DropAggregateStatement, DropFunctionStatement, DropIndexStatement, DropKeyspaceStatement, DropTableStatement, DropTriggerStatement, DropTypeStatement, DropViewStatement

public interface SchemaTransformation

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static class	SchemaTransformation.SchemaTransformationResult The result of applying (on this node) a given schema transformation.

Method Summary

Modifier and Type	Method and Description
Keyspaces	apply(Keyspaces schema) Apply a statement transformation to a schema snapshot.
default java.util.Optional<java.lang.Long>	fixedTimestampMicros() If the transformation should be applied with a certain timestamp, this method should be overriden.

Method Detail

apply

Keyspaces apply(Keyspaces schema)

Apply a statement transformation to a schema snapshot.

Implementing methods should be side-effect free (outside of throwing exceptions if the transformation cannot be successfully applied to the provided schema).

Parameters:

schema - Keyspaces to base the transformation on

Returns:

Keyspaces transformed by the statement

fixedTimestampMicros

default java.util.Optional<java.lang.Long> fixedTimestampMicros()

If the transformation should be applied with a certain timestamp, this method should be overriden. This is used by SchemaTransformations.updateSystemKeyspace(KeyspaceMetadata, long) when we need to set the fixed timestamp in order to preserve user settings.