org.apache.kafka.streams.kstream

Class Consumed<K,V>

java.lang.Object

org.apache.kafka.streams.kstream.Consumed<K,V>

Type Parameters:

K - type of record key

V - type of record value

public class Consumed<K,V>
extends java.lang.Object

The Consumed class is used to define the optional parameters when using StreamsBuilder to build instances of KStream, KTable, and GlobalKTable.

For example, you can read a topic as KStream with a custom timestamp extractor and specify the corresponding key and value serdes like:

 StreamsBuilder builder = new StreamsBuilder();
 KStream<String, Long> stream = builder.stream(
   "topicName",
   Consumed.with(Serdes.String(), Serdes.Long())
           .withTimestampExtractor(new LogAndSkipOnInvalidTimestamp()));
 

Similarly, you can read a topic as KTable with a custom auto.offset.reset configuration and force a state store materialization to access the content via interactive queries:

 StreamsBuilder builder = new StreamsBuilder();
 KTable<Integer, Integer> table = builder.table(
   "topicName",
   Consumed.with(AutoOffsetReset.LATEST),
   Materialized.as("queryable-store-name"));
 

Field Summary

Fields

Modifier and Type	Field and Description
protected org.apache.kafka.common.serialization.Serde<K>	keySerde
protected Topology.AutoOffsetReset	resetPolicy
protected TimestampExtractor	timestampExtractor
protected org.apache.kafka.common.serialization.Serde<V>	valueSerde

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	Consumed(Consumed<K,V> consumed) Create an instance of Consumed from an existing instance.

Method Summary

Modifier and Type	Method and Description
boolean	equals(java.lang.Object o)
int	hashCode()
static <K,V> Consumed<K,V>	with(org.apache.kafka.common.serialization.Serde<K> keySerde, org.apache.kafka.common.serialization.Serde<V> valueSerde) Create an instance of Consumed with key and value Serdes.
static <K,V> Consumed<K,V>	with(org.apache.kafka.common.serialization.Serde<K> keySerde, org.apache.kafka.common.serialization.Serde<V> valueSerde, TimestampExtractor timestampExtractor, Topology.AutoOffsetReset resetPolicy) Create an instance of Consumed with the supplied arguments.
static <K,V> Consumed<K,V>	with(TimestampExtractor timestampExtractor) Create an instance of Consumed with a TimestampExtractor.
static <K,V> Consumed<K,V>	with(Topology.AutoOffsetReset resetPolicy) Create an instance of Consumed with a Topology.AutoOffsetReset.
Consumed<K,V>	withKeySerde(org.apache.kafka.common.serialization.Serde<K> keySerde) Configure the instance of Consumed with a key Serde.
Consumed<K,V>	withOffsetResetPolicy(Topology.AutoOffsetReset resetPolicy) Configure the instance of Consumed with a Topology.AutoOffsetReset.
Consumed<K,V>	withTimestampExtractor(TimestampExtractor timestampExtractor) Configure the instance of Consumed with a TimestampExtractor.
Consumed<K,V>	withValueSerde(org.apache.kafka.common.serialization.Serde<V> valueSerde) Configure the instance of Consumed with a value Serde.

Methods inherited from class java.lang.Object

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

Field Detail

keySerde

protected org.apache.kafka.common.serialization.Serde<K> keySerde

valueSerde

protected org.apache.kafka.common.serialization.Serde<V> valueSerde

timestampExtractor

protected TimestampExtractor timestampExtractor

resetPolicy

protected Topology.AutoOffsetReset resetPolicy

Constructor Detail

Consumed

protected Consumed(Consumed<K,V> consumed)

Create an instance of Consumed from an existing instance.

Parameters:

consumed - the instance of Consumed to copy

Method Detail

with

public static <K,V> Consumed<K,V> with(org.apache.kafka.common.serialization.Serde<K> keySerde,
                                       org.apache.kafka.common.serialization.Serde<V> valueSerde,
                                       TimestampExtractor timestampExtractor,
                                       Topology.AutoOffsetReset resetPolicy)

Create an instance of Consumed with the supplied arguments. null values are acceptable.

Type Parameters:

K - key type

V - value type

Parameters:

keySerde - the key serde. If null the default key serde from config will be used

valueSerde - the value serde. If null the default value serde from config will be used

timestampExtractor - the timestamp extractor to used. If null the default timestamp extractor from config will be used

resetPolicy - the offset reset policy to be used. If null the default reset policy from config will be used

Returns:

a new instance of Consumed

with

public static <K,V> Consumed<K,V> with(org.apache.kafka.common.serialization.Serde<K> keySerde,
                                       org.apache.kafka.common.serialization.Serde<V> valueSerde)

Create an instance of Consumed with key and value Serdes.

Type Parameters:

K - key type

V - value type

Parameters:

keySerde - the key serde. If nullthe default key serde from config will be used

valueSerde - the value serde. If null the default value serde from config will be used

Returns:

a new instance of Consumed

with

public static <K,V> Consumed<K,V> with(TimestampExtractor timestampExtractor)

Create an instance of Consumed with a TimestampExtractor.

Type Parameters:

K - key type

V - value type

Parameters:

timestampExtractor - the timestamp extractor to used. If null the default timestamp extractor from config will be used

Returns:

a new instance of Consumed

with

public static <K,V> Consumed<K,V> with(Topology.AutoOffsetReset resetPolicy)

Create an instance of Consumed with a Topology.AutoOffsetReset.

Type Parameters:

K - key type

V - value type

Parameters:

resetPolicy - the offset reset policy to be used. If null the default reset policy from config will be used

Returns:

a new instance of Consumed

withKeySerde

public Consumed<K,V> withKeySerde(org.apache.kafka.common.serialization.Serde<K> keySerde)

Configure the instance of Consumed with a key Serde.

Parameters:

keySerde - the key serde. If nullthe default key serde from config will be used

Returns:

this

withValueSerde

public Consumed<K,V> withValueSerde(org.apache.kafka.common.serialization.Serde<V> valueSerde)

Configure the instance of Consumed with a value Serde.

Parameters:

valueSerde - the value serde. If null the default value serde from config will be used

Returns:

this

withTimestampExtractor

public Consumed<K,V> withTimestampExtractor(TimestampExtractor timestampExtractor)

Configure the instance of Consumed with a TimestampExtractor.

Parameters:

timestampExtractor - the timestamp extractor to used. If null the default timestamp extractor from config will be used

Returns:

this

withOffsetResetPolicy

public Consumed<K,V> withOffsetResetPolicy(Topology.AutoOffsetReset resetPolicy)

Configure the instance of Consumed with a Topology.AutoOffsetReset.

Parameters:

resetPolicy - the offset reset policy to be used. If null the default reset policy from config will be used

Returns:

this

equals

public boolean equals(java.lang.Object o)

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object