KafkaHeader (HiveMQ Kafka Extension Customization SDK 4.28.1 API)

```
@Immutable
@DoNotImplement
public interface KafkaHeader
```
Represents the header of a Kafka record, that was either read from or should be written to a Kafka cluster.
The internal state of this interface is completely immutable. All returned ByteBuffers are read only and a deep copy of any byte[] is made for every method call returning one.

Since:

4.4.0

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`@NotNull String`	`getKey()`
`@NotNull ByteBuffer`	`getValue()`
`byte @NotNull []`	`getValueAsByteArray()`
`@NotNull String`	`getValueAsString()`
`@NotNull String`	`getValueAsString(@NotNull Charset charset)`

- Method Detail
  - getKey
```
@NotNull
@NotNull String getKey()
```
    Returns:
    
    The key of this header.
    
    Since:
    
    4.4.0
  - getValue
```
@NotNull
@NotNull ByteBuffer getValue()
```
    Returns:
    
    The value of this header.
    
    Since:
    
    4.4.0
  - getValueAsByteArray
```
byte @NotNull [] getValueAsByteArray()
```
    Returns:
    
    The value of this header.
    
    Since:
    
    4.4.0
  - getValueAsString
```
@NotNull
@NotNull String getValueAsString()
```
    Returns:
    
    The value of this header as a string. UTF_8 is used for the decoding.
    
    Since:
    
    4.4.0
  - getValueAsString
```
@NotNull
@NotNull String getValueAsString(@NotNull
                                 @NotNull Charset charset)
```
    Parameters:
    
    charset - The Charset that is used for the decoding.
    
    Returns:
    
    The value of this header as a string.
    
    Since:
    
    4.4.0