Package io.github.kaststream.api.v2

Interface AsyncProcessor

All Superinterfaces:

Serializable

public interface AsyncProcessor
extends Serializable

Method Summary

Modifier and Type	Method	Description
void	asyncInvoke(KastRow input, KastResultFuture resultFuture, KastRowBuilder kastRowBuilder)	Trigger async operation for each stream input.
default void	close()	Tear-down method for the user code (ex: clean resources from open).
org.apache.avro.Schema	getProducedType(org.apache.avro.Schema schema)	Declare the data type information of the data produced by your function.
default void	open(Map<String,String> configuration, org.apache.avro.Schema schema)	Initialization method for the function.
default void	open(Map<String,String> configuration, org.apache.avro.Schema schema, Map<String,Object> meta)	Initialization method for the function.

Method Detail

getProducedType

org.apache.avro.Schema getProducedType(org.apache.avro.Schema schema)

Declare the data type information of the data produced by your function.

Parameters:

schema - the input row schema

Returns:

the output row type information

open

default void open(Map<String,String> configuration,
                  org.apache.avro.Schema schema)
           throws Exception

Initialization method for the function. It is called before the actual working method.

Parameters:

configuration - The configuration containing the parameters attached to the contract.

schema - the input row schema

Throws:

Exception - The function may throw exceptions which cause the streaming program to fail and go into recovery.

open

default void open(Map<String,String> configuration,
                  org.apache.avro.Schema schema,
                  Map<String,Object> meta)
           throws Exception

Initialization method for the function.

Parameters:

configuration - The configuration containing the parameters attached to the contract

schema - the input row schema

meta - the udf configuration parameters

Throws:

Exception - The function may throw exceptions which cause the streaming program to fail and go into recovery.

close

default void close()
            throws Exception

Tear-down method for the user code (ex: clean resources from open).

Throws:

Exception - The function may throw exceptions which cause the streaming program to fail and go into recovery.

asyncInvoke

void asyncInvoke(KastRow input,
                 KastResultFuture resultFuture,
                 KastRowBuilder kastRowBuilder)
          throws Exception

Trigger async operation for each stream input.

Parameters:

input - element coming from an upstream task

resultFuture - to be completed with the result data

Throws:

Exception - in case of a user code error. An exception will make the task fail and trigger fail-over process.