org.zalando.nakadiproducer.eventlog.impl

Class EventLogWriterImpl

java.lang.Object

org.zalando.nakadiproducer.eventlog.impl.EventLogWriterImpl

All Implemented Interfaces:

EventLogWriter

public class EventLogWriterImpl
extends Object
implements EventLogWriter

Constructor Summary

Constructors

Constructor and Description
EventLogWriterImpl(EventLogRepository eventLogRepository, com.fasterxml.jackson.databind.ObjectMapper objectMapper, FlowIdComponent flowIdComponent)

Method Summary

Modifier and Type	Method and Description
void	fireBusinessEvent(String eventType, Object payload) Fires a business event, i.e. an event communicating the fact that some business process step happened.
void	fireCreateEvent(String eventType, String dataType, Object data) Fires a data change event about a creation of some resource (object).
void	fireDeleteEvent(String eventType, String dataType, Object data) Fires a data change event about the deletion of some resource (object).
void	fireSnapshotEvent(String eventType, String dataType, Object data) Fires a data change event with a snapshot of some resource (object).
void	fireUpdateEvent(String eventType, String dataType, Object data) Fires a data change event about an update of some resource (object).

Methods inherited from class java.lang.Object

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

Constructor Detail

EventLogWriterImpl

public EventLogWriterImpl(EventLogRepository eventLogRepository,
                          com.fasterxml.jackson.databind.ObjectMapper objectMapper,
                          FlowIdComponent flowIdComponent)

Method Detail

fireCreateEvent

public void fireCreateEvent(String eventType,
                            String dataType,
                            Object data)

Description copied from interface: EventLogWriter

Fires a data change event about a creation of some resource (object).

Specified by:

fireCreateEvent in interface EventLogWriter

Parameters:

eventType - the Nakadi event type of the event. This is roughly equivalent to an event channel or topic.

dataType - the content of the data_type field of the Nakadi event.

data - some POJO that can be serialized into JSON (required parameter). This is meant to be a representation of the resource which was created. It will be used as content of the data field of the Nakadi event.

fireUpdateEvent

public void fireUpdateEvent(String eventType,
                            String dataType,
                            Object data)

Description copied from interface: EventLogWriter

Fires a data change event about an update of some resource (object).

Specified by:

fireUpdateEvent in interface EventLogWriter

Parameters:

eventType - the Nakadi event type of the event. This is roughly equivalent to an event channel or topic.

dataType - the content of the data_type field of the Nakadi event.

data - some POJO that can be serialized into JSON (required parameter). This is meant to be a representation of the new state of the resource which was updated. It will be used as content of the data field of the Nakadi event.

fireDeleteEvent

public void fireDeleteEvent(String eventType,
                            String dataType,
                            Object data)

Description copied from interface: EventLogWriter

Fires a data change event about the deletion of some resource (object).

Specified by:

fireDeleteEvent in interface EventLogWriter

Parameters:

eventType - the Nakadi event type of the event. This is roughly equivalent to an event channel or topic.

dataType - the content of the data_type field of the Nakadi event.

data - some POJO that can be serialized into JSON (required parameter). This is meant to be a representation of the last state (before the deletion) of the resource which was deleted. It will be used as content of the data field of the Nakadi event.

fireSnapshotEvent

public void fireSnapshotEvent(String eventType,
                              String dataType,
                              Object data)

Description copied from interface: EventLogWriter

Fires a data change event with a snapshot of some resource (object).

This notifies your consumers about the current state of a resource, even if nothing changed. Typical use cases include initial replication to new consumers or hotfixes of data inconsistencies between producer and consumer.

Normally applications don't have to call this themselves, instead they should implement the SnapshotEventProvider interface to add support for snapshot creation via the actuator endpoint.

Specified by:

fireSnapshotEvent in interface EventLogWriter

Parameters:

eventType - the Nakadi event type of the event. This is roughly equivalent to an event channel or topic.

dataType - the content of the data_type field of the Nakadi event.

data - some POJO that can be serialized into JSON (required parameter). This is meant to be a representation of the current state of the resource. It will be used as content of the data field of the Nakadi event.

fireBusinessEvent

public void fireBusinessEvent(String eventType,
                              Object payload)

Description copied from interface: EventLogWriter

Fires a business event, i.e. an event communicating the fact that some business process step happened. The payload object will be used as the main event content (just metadata will be added). Same as for data change events, you should call this method in the same transaction as you are storing related changes into your database.

Specified by:

fireBusinessEvent in interface EventLogWriter

Parameters:

eventType - the Nakadi event type of the event. This is roughly equivalent to an event channel or topic.

payload - some POJO that can be serialized into JSON (required parameter)