Package org.apache.kafka.streams.kstream

Class Printed<K,V>

java.lang.Object
org.apache.kafka.streams.kstream.Printed<K,V>
Type Parameters:
K - key type
V - value type
public class Printed<K,V> extends Object
An object to define the options used when printing a KStream.
See Also:

  • Method Details

    • toFile

      public static <K, V> Printed<K,V> toFile(String filePath)
      Print the records of a KStream to a file.
      Type Parameters:
      K - key type
      V - value type
      Parameters:
      filePath - path of the file
      Returns:
      a new Printed instance

    • toSysOut

      public static <K, V> Printed<K,V> toSysOut()
      Print the records of a KStream to system out.
      Type Parameters:
      K - key type
      V - value type
      Returns:
      a new Printed instance

    • withLabel

      public Printed<K,V> withLabel(String label)
      Print the records of a KStream with the provided label.
      Parameters:
      label - label to use
      Returns:
      this

    • withKeyValueMapper

      public Printed<K,V> withKeyValueMapper(KeyValueMapper<? super K,? super V,String> mapper)
      Print the records of a KStream with the provided KeyValueMapper The provided KeyValueMapper's mapped value type must be String.

      The example below shows how to customize output data. 

      
 final KeyValueMapper<Integer, String, String> mapper = new KeyValueMapper<Integer, String, String>() {
     public String apply(Integer key, String value) {
         return String.format("(%d, %s)", key, value);
     }
 };
      Implementors will need to override toString() for keys and values that are not of type String, Integer etc. to get meaningful information.
      Parameters:
      mapper - mapper to use
      Returns:
      this

    • withName

      public Printed<K,V> withName(String processorName)
      Print the records of a KStream with provided processor name.
      Parameters:
      processorName - the processor name to be used. If null a default processor name will be generated
      Returns:
      this