Package org.apache.flink.streaming.api.functions.source.datagen

Class SequenceGenerator<T>

java.lang.Object

org.apache.flink.streaming.api.functions.source.datagen.SequenceGenerator<T>

All Implemented Interfaces:

Serializable, Iterator<T>, DataGenerator<T>

@Experimental
public abstract class SequenceGenerator<T>
extends Object
implements DataGenerator<T>

A stateful, re-scalable DataGenerator that emits each number from a given interval exactly once, possibly in parallel.

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected Deque<Long>	valuesToEmit

Constructor Summary

Constructors

Constructor	Description
SequenceGenerator(long start, long end)	Creates a DataGenerator that emits all numbers from the given interval exactly once.

Method Summary

Modifier and Type	Method	Description
static SequenceGenerator<BigDecimal>	bigDecimalGenerator(int start, int end, int precision, int scale)
static SequenceGenerator<Byte>	byteGenerator(byte start, byte end)
static SequenceGenerator<Double>	doubleGenerator(int start, int end)
static SequenceGenerator<Float>	floatGenerator(short start, short end)
boolean	hasNext()
static SequenceGenerator<Integer>	intGenerator(int start, int end)
static SequenceGenerator<Long>	longGenerator(long start, long end)
void	open(String name, org.apache.flink.runtime.state.FunctionInitializationContext context, org.apache.flink.api.common.functions.RuntimeContext runtimeContext)	Open and initialize state for DataGenerator.
static SequenceGenerator<Short>	shortGenerator(short start, short end)
void	snapshotState(org.apache.flink.runtime.state.FunctionSnapshotContext context)	Snapshot state for DataGenerator.
static SequenceGenerator<String>	stringGenerator(long start, long end)

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Iterator

forEachRemaining, next, remove

Field Details

valuesToEmit

protected transient Deque<Long> valuesToEmit

Constructor Details

SequenceGenerator

public SequenceGenerator(long start,
 long end)

Creates a DataGenerator that emits all numbers from the given interval exactly once.

Parameters:

start - Start of the range of numbers to emit.

end - End of the range of numbers to emit.

Method Details

open

public void open(String name,
 org.apache.flink.runtime.state.FunctionInitializationContext context,
 org.apache.flink.api.common.functions.RuntimeContext runtimeContext)
          throws Exception

Description copied from interface: DataGenerator

Open and initialize state for DataGenerator. See CheckpointedFunction.initializeState(org.apache.flink.runtime.state.FunctionInitializationContext).

Specified by:

open in interface DataGenerator<T>

Parameters:

name - The state of DataGenerator should related to this name, make sure the name of state is different.

Throws:

Exception

snapshotState

public void snapshotState(org.apache.flink.runtime.state.FunctionSnapshotContext context)
                   throws Exception

Description copied from interface: DataGenerator

Snapshot state for DataGenerator. See CheckpointedFunction.snapshotState(org.apache.flink.runtime.state.FunctionSnapshotContext).

Specified by:

snapshotState in interface DataGenerator<T>

Throws:

Exception

hasNext

public boolean hasNext()

Specified by:

hasNext in interface Iterator<T>

longGenerator

public static SequenceGenerator<Long> longGenerator(long start,
 long end)

intGenerator

public static SequenceGenerator<Integer> intGenerator(int start,
 int end)

shortGenerator

public static SequenceGenerator<Short> shortGenerator(short start,
 short end)

byteGenerator

public static SequenceGenerator<Byte> byteGenerator(byte start,
 byte end)

floatGenerator

public static SequenceGenerator<Float> floatGenerator(short start,
 short end)

doubleGenerator

public static SequenceGenerator<Double> doubleGenerator(int start,
 int end)

bigDecimalGenerator

public static SequenceGenerator<BigDecimal> bigDecimalGenerator(int start,
 int end,
 int precision,
 int scale)

stringGenerator

public static SequenceGenerator<String> stringGenerator(long start,
 long end)