public interface KeyExtractorA KeyExtractor can extract the Pub/Sub Lite 'key' field used for message routing from a PubsubMessage. It will by default use the ordering_key field directly for this if it exists.
An empty ByteString implies that the message should have no ordering key.
Static Fields
DEFAULT
public static final KeyExtractor DEFAULTAn extractor that gets the routing key from the ordering key field.
| Field Value | |
|---|---|
| Type | Description |
KeyExtractor |
|
Methods
extractKey(PubsubMessage message)
public abstract ByteString extractKey(PubsubMessage message)Extract the ByteString routing key from a PubsubMessage.
| Parameter | |
|---|---|
| Name | Description |
message |
com.google.pubsub.v1.PubsubMessage |
| Returns | |
|---|---|
| Type | Description |
ByteString |
|
| Exceptions | |
|---|---|
| Type | Description |
ApiException |
|