org.apache.flink.sql.tests

Class StreamSQLTestProgram.GeneratorTableSource

java.lang.Object

org.apache.flink.sql.tests.StreamSQLTestProgram.GeneratorTableSource

All Implemented Interfaces:

DefinedFieldMapping, DefinedRowtimeAttributes, StreamTableSource<Row>, TableSource<Row>

Enclosing class:

StreamSQLTestProgram

public static class StreamSQLTestProgram.GeneratorTableSource
extends Object
implements StreamTableSource<Row>, DefinedRowtimeAttributes, DefinedFieldMapping

TableSource for generated data.

Constructor Summary

Constructors

Constructor and Description
GeneratorTableSource(int numKeys, float recordsPerKeyAndSecond, int durationSeconds, int offsetSeconds)

Method Summary

Modifier and Type	Method and Description
String	explainSource() Describes the table source.
DataStream<Row>	getDataStream(StreamExecutionEnvironment execEnv) Returns the data of the table as a DataStream.
Map<String,String>	getFieldMapping() Returns the mapping for the fields of the TableSource's TableSchema to the fields of its produced DataType.
TypeInformation<Row>	getReturnType()
List<RowtimeAttributeDescriptor>	getRowtimeAttributeDescriptors() Returns a list of RowtimeAttributeDescriptor for all rowtime attributes of the table.
TableSchema	getTableSchema() Returns the schema of the produced table.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.flink.table.sources.StreamTableSource

isBounded

Methods inherited from interface org.apache.flink.table.sources.TableSource

getProducedDataType

Constructor Detail

GeneratorTableSource

public GeneratorTableSource(int numKeys,
                            float recordsPerKeyAndSecond,
                            int durationSeconds,
                            int offsetSeconds)

Method Detail

getDataStream

public DataStream<Row> getDataStream(StreamExecutionEnvironment execEnv)

Description copied from interface: StreamTableSource

Returns the data of the table as a DataStream.

NOTE: This method is for internal use only for defining a TableSource. Do not use it in Table API programs.

Specified by:

getDataStream in interface StreamTableSource<Row>

getReturnType

public TypeInformation<Row> getReturnType()

Specified by:

getReturnType in interface TableSource<Row>

getTableSchema

public TableSchema getTableSchema()

Description copied from interface: TableSource

Returns the schema of the produced table.

Specified by:

getTableSchema in interface TableSource<Row>

Returns:

The TableSchema of the produced table.

explainSource

public String explainSource()

Description copied from interface: TableSource

Describes the table source.

Specified by:

explainSource in interface TableSource<Row>

Returns:

A String explaining the TableSource.

getRowtimeAttributeDescriptors

public List<RowtimeAttributeDescriptor> getRowtimeAttributeDescriptors()

Description copied from interface: DefinedRowtimeAttributes

Returns a list of RowtimeAttributeDescriptor for all rowtime attributes of the table.

All referenced attributes must be present in the TableSchema of the TableSource and of type Types.SQL_TIMESTAMP.

Specified by:

getRowtimeAttributeDescriptors in interface DefinedRowtimeAttributes

Returns:

A list of RowtimeAttributeDescriptor.

getFieldMapping

public Map<String,String> getFieldMapping()

Description copied from interface: DefinedFieldMapping

Returns the mapping for the fields of the TableSource's TableSchema to the fields of its produced DataType.

The mapping is done based on field names, e.g., a mapping "name" -> "f1" maps the schema field "name" to the field "f1" of the produced data type, for example in this case the second field of a Tuple.

The returned mapping must map all fields (except proctime and rowtime fields) to the produced data type. It can also provide a mapping for fields which are not in the TableSchema to make fields in the physical DataType accessible for a TimestampExtractor.

Specified by:

getFieldMapping in interface DefinedFieldMapping

Returns:

A mapping from TableSchema fields to DataType fields or null if no mapping is necessary.