org.apache.kafka.connect.header

Interface Header

public interface Header

A Header is a key-value pair, and multiple headers can be included with the key, value, and timestamp in each Kafka message. If the value contains schema information, then the header will have a non-null schema.

This is an immutable interface.

Method Summary

Methods

Modifier and Type	Method and Description
java.lang.String	key() The header's key, which is not necessarily unique within the set of headers on a Kafka message.
Header	rename(java.lang.String key) Return a new Header object that has the same schema and value but with the supplied key.
Schema	schema() Return the Schema associated with this header, if there is one.
java.lang.Object	value() Get the header's value as deserialized by Connect's header converter.
Header	with(Schema schema, java.lang.Object value) Return a new Header object that has the same key but with the supplied value.

Method Detail

key

java.lang.String key()

The header's key, which is not necessarily unique within the set of headers on a Kafka message.

Returns:

the header's key; never null

schema

Schema schema()

Return the Schema associated with this header, if there is one. Not all headers will have schemas.

Returns:

the header's schema, or null if no schema is associated with this header

value

java.lang.Object value()

Get the header's value as deserialized by Connect's header converter.

Returns:

the deserialized object representation of the header's value; may be null

with

Header with(Schema schema,
          java.lang.Object value)

Return a new Header object that has the same key but with the supplied value.

Parameters:

schema - the schema for the new value; may be null

value - the new value

Returns:

the new Header; never null

rename

Header rename(java.lang.String key)

Return a new Header object that has the same schema and value but with the supplied key.

Parameters:

key - the key for the new header; may not be null

Returns:

the new Header; never null