Package org.apache.flink.connector.base.source.hybrid

Class HybridSource<T>

  • All Implemented Interfaces:
    Serializable, Source<T,​HybridSourceSplit,​HybridSourceEnumeratorState>, SourceReaderFactory<T,​HybridSourceSplit>
    @PublicEvolving
public class HybridSource<T>
extends Object
implements Source<T,​HybridSourceSplit,​HybridSourceEnumeratorState>
    Hybrid source that switches underlying sources based on configured source chain.

    A simple example with FileSource and KafkaSource with fixed Kafka start position: 

    
 FileSource<String> fileSource =
   FileSource.forRecordStreamFormat(new TextLineInputFormat(), Path.fromLocalFile(testDir)).build();
 KafkaSource<String> kafkaSource =
           KafkaSource.<String>builder()
                   .setBootstrapServers("localhost:9092")
                   .setGroupId("MyGroup")
                   .setTopics(Arrays.asList("quickstart-events"))
                   .setDeserializer(
                           KafkaRecordDeserializer.valueOnly(StringDeserializer.class))
                   .setStartingOffsets(OffsetsInitializer.earliest())
                   .build();
 HybridSource<String> hybridSource =
           HybridSource.builder(fileSource)
                   .addSource(kafkaSource)
                   .build();

    A more complex example with Kafka start position derived from previous source: 

    
 HybridSource<String> hybridSource =
     HybridSource.<String, StaticFileSplitEnumerator>builder(fileSource)
         .addSource(
             switchContext -> {
               StaticFileSplitEnumerator previousEnumerator =
                   switchContext.getPreviousEnumerator();
               // how to get timestamp depends on specific enumerator
               long timestamp = previousEnumerator.getEndTimestamp();
               OffsetsInitializer offsets =
                   OffsetsInitializer.timestamp(timestamp);
               KafkaSource<String> kafkaSource =
                   KafkaSource.<String>builder()
                       .setBootstrapServers("localhost:9092")
                       .setGroupId("MyGroup")
                       .setTopics(Arrays.asList("quickstart-events"))
                       .setDeserializer(
                           KafkaRecordDeserializer.valueOnly(StringDeserializer.class))
                       .setStartingOffsets(offsets)
                       .build();
               return kafkaSource;
             },
             Boundedness.CONTINUOUS_UNBOUNDED)
         .build();
    See Also:
    Serialized Form