org.wso2.siddhi.core.util.transport

Class SingleClientDistributedSink

java.lang.Object

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

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

org.wso2.siddhi.core.util.transport.SingleClientDistributedSink

All Implemented Interfaces:

SinkListener, Snapshotable

public class SingleClientDistributedSink
extends DistributedTransport

This class implements a the distributed sink that could publish to multiple destination using a single client/publisher. Following are some examples, - In a case where there are multiple partitions in a single topic in Kafka, the same kafka client can be used to send events to all the partitions within the topic. - The same email client can send email to different addresses.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
class	SingleClientDistributedSink.SingleClientConnectionCallback Connection callback to notify DistributionStrategy about new connection initiations and failures

Nested classes/interfaces inherited from class org.wso2.siddhi.core.stream.output.sink.distributed.DistributedTransport

DistributedTransport.ConnectionCallback

Field Summary

Fields inherited from class org.wso2.siddhi.core.stream.output.sink.distributed.DistributedTransport

siddhiAppContext, strategy, streamDefinition

Fields inherited from class org.wso2.siddhi.core.stream.output.sink.Sink

isTryingToConnect

Constructor Summary

Constructors

Constructor and Description
SingleClientDistributedSink()

Method Summary

Modifier and Type	Method and Description
void	connect() Will be called to connect to the backend before events are published
Map<String,Object>	currentState() Used to collect the serializable state of the processing element, that need to be persisted for the reconstructing the element to the same state on a different point of time
void	destroy() Will be called at the end to clean all the resources consumed
void	disconnect() Will be called after all publishing is done, or when ConnectionUnavailableException is thrown
Class[]	getSupportedInputEventClasses()
void	initTransport(OptionHolder sinkOptionHolder, List<OptionHolder> destinationOptionHolders, org.wso2.siddhi.query.api.annotation.Annotation sinkAnnotation, ConfigReader sinkConfigReader, DistributionStrategy strategy, String type, SiddhiAppContext siddhiAppContext)
void	publish(Object payload, DynamicOptions transportOptions, Integer destinationId)
void	restoreState(Map<String,Object> state) Used to restore serialized state of the processing element, for reconstructing the element to the same state as if was on a previous point of time.

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

connectWithRetry, getSupportedDynamicOptions, init, init, isConnected, publish

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

getElementId, getHandler, getMapper, getStreamDefinition, getType, init, initOnlyTransport, publish, setConnected, shutdown

Methods inherited from class java.lang.Object

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

Constructor Detail

SingleClientDistributedSink

public SingleClientDistributedSink()

Method Detail

publish

public void publish(Object payload,
                    DynamicOptions transportOptions,
                    Integer destinationId)
             throws ConnectionUnavailableException

Specified by:

publish in class DistributedTransport

Throws:

ConnectionUnavailableException

initTransport

public void initTransport(OptionHolder sinkOptionHolder,
                          List<OptionHolder> destinationOptionHolders,
                          org.wso2.siddhi.query.api.annotation.Annotation sinkAnnotation,
                          ConfigReader sinkConfigReader,
                          DistributionStrategy strategy,
                          String type,
                          SiddhiAppContext siddhiAppContext)

Specified by:

initTransport in class DistributedTransport

getSupportedInputEventClasses

public Class[] getSupportedInputEventClasses()

Specified by:

getSupportedInputEventClasses in class Sink

connect

public void connect()
             throws ConnectionUnavailableException

Will be called to connect to the backend before events are published

Specified by:

connect in class Sink

Throws:

ConnectionUnavailableException - if it cannot connect to the backend

disconnect

public void disconnect()

Will be called after all publishing is done, or when ConnectionUnavailableException is thrown

Specified by:

disconnect in class Sink

destroy

public void destroy()

Will be called at the end to clean all the resources consumed

Specified by:

destroy in class Sink

currentState

public Map<String,Object> currentState()

Used to collect the serializable state of the processing element, that need to be persisted for the reconstructing the element to the same state on a different point of time

Returns:

stateful objects of the processing element as an array

restoreState

public void restoreState(Map<String,Object> state)

Used to restore serialized state of the processing element, for reconstructing the element to the same state as if was on a previous point of time.

Parameters:

state - the stateful objects of the element as an array on the same order provided by currentState().