org.wso2.siddhi.core.stream.output.sink.distributed

Class RoundRobinDistributionStrategy

java.lang.Object

org.wso2.siddhi.core.stream.output.sink.distributed.DistributionStrategy

org.wso2.siddhi.core.stream.output.sink.distributed.RoundRobinDistributionStrategy

public class RoundRobinDistributionStrategy
extends DistributionStrategy

Publishing strategy to implement messages in a round robin manner to multiple destinations

Constructor Summary

Constructors

Constructor and Description
RoundRobinDistributionStrategy()

Method Summary

Modifier and Type	Method and Description
List<Integer>	getDestinationsToPublish(Object payload, DynamicOptions transportOptions) This method tells the ID(s) of the destination(s) to which a given messages should be sent.
void	init(org.wso2.siddhi.query.api.definition.StreamDefinition streamDefinition, OptionHolder transportOptionHolder, OptionHolder distributionOptionHolder, List<OptionHolder> destinationOptionHolders, ConfigReader configReader) Initialize the Distribution strategy with the information it will require to make decisions.

Methods inherited from class org.wso2.siddhi.core.stream.output.sink.distributed.DistributionStrategy

destinationAvailable, destinationFailed, getActiveDestinationCount

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

RoundRobinDistributionStrategy

public RoundRobinDistributionStrategy()

Method Detail

init

public void init(org.wso2.siddhi.query.api.definition.StreamDefinition streamDefinition,
                 OptionHolder transportOptionHolder,
                 OptionHolder distributionOptionHolder,
                 List<OptionHolder> destinationOptionHolders,
                 ConfigReader configReader)

Initialize the Distribution strategy with the information it will require to make decisions.

Specified by:

init in class DistributionStrategy

Parameters:

streamDefinition - The stream attached to the sink this DistributionStrategy is used in

transportOptionHolder - Sink options of the sink which uses this DistributionStrategy

destinationOptionHolders - The list of options under @destination of the relevant sink.

configReader - This hold the RoundRobinDistributionStrategy configuration reader.

distributionOptionHolder - The option under @destination of the relevant sink.

getDestinationsToPublish

public List<Integer> getDestinationsToPublish(Object payload,
                                              DynamicOptions transportOptions)

This method tells the ID(s) of the destination(s) to which a given messages should be sent. There can be cases where a given message is only sent to a specific destination(e.g., partition based) and message is sent to multiple endpoints(e.g., broadcast)

Specified by:

getDestinationsToPublish in class DistributionStrategy

Parameters:

payload - payload of the message

transportOptions - Dynamic transport options of the sink

Returns:

Set of IDs of the destination to which the event should be sent