org.zalando.nakadiproducer.eventlog.impl.EventLogWriterImpl Maven / Gradle / Ivy

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Reliable transactional Nakadi event producer
There is a newer version: 30.0.0-RC1
package org.zalando.nakadiproducer.eventlog.impl;

import static org.zalando.nakadiproducer.eventlog.impl.EventDataOperation.CREATE;
import static org.zalando.nakadiproducer.eventlog.impl.EventDataOperation.DELETE;
import static org.zalando.nakadiproducer.eventlog.impl.EventDataOperation.SNAPSHOT;
import static org.zalando.nakadiproducer.eventlog.impl.EventDataOperation.UPDATE;

import org.zalando.nakadiproducer.flowid.FlowIdComponent;
import org.zalando.nakadiproducer.eventlog.EventLogWriter;

import javax.transaction.Transactional;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;

public class EventLogWriterImpl implements EventLogWriter {

    private final EventLogRepository eventLogRepository;

    private final ObjectMapper objectMapper;
    private final FlowIdComponent flowIdComponent;

    public EventLogWriterImpl(EventLogRepository eventLogRepository, ObjectMapper objectMapper, FlowIdComponent flowIdComponent) {
        this.eventLogRepository = eventLogRepository;
        this.objectMapper = objectMapper;
        this.flowIdComponent = flowIdComponent;
    }

    @Override
    @Transactional
    public void fireCreateEvent(final String eventType, final String dataType, final Object data) {
        final EventLog eventLog = createEventLog(eventType, new DataChangeEventEnvelope(CREATE.toString(), dataType, data));
        eventLogRepository.persist(eventLog);
    }

    @Override
    @Transactional
    public void fireUpdateEvent(final String eventType, final String dataType, final Object data) {
        final EventLog eventLog = createEventLog(eventType, new DataChangeEventEnvelope(UPDATE.toString(), dataType, data));
        eventLogRepository.persist(eventLog);
    }

    @Override
    @Transactional
    public void fireDeleteEvent(final String eventType, final String dataType, final Object data) {
        final EventLog eventLog = createEventLog(eventType, new DataChangeEventEnvelope(DELETE.toString(), dataType, data));
        eventLogRepository.persist(eventLog);
    }

    @Override
    @Transactional
    public void fireSnapshotEvent(final String eventType, final String dataType, final Object data) {
        final EventLog eventLog = createEventLog(eventType, new DataChangeEventEnvelope(SNAPSHOT.toString(), dataType, data));
        eventLogRepository.persist(eventLog);
    }

    @Override
    @Transactional
    public void fireBusinessEvent(final String eventType, Object payload) {
        final EventLog eventLog = createEventLog(eventType, payload);
        eventLogRepository.persist(eventLog);
    }

    private EventLog createEventLog(final String eventType, final Object eventPayload) {
        final EventLog eventLog = new EventLog();
        eventLog.setEventType(eventType);
        try {
            eventLog.setEventBodyData(objectMapper.writeValueAsString(eventPayload));
        } catch (final JsonProcessingException e) {
            throw new IllegalStateException("could not map object to json: " + eventPayload.toString(), e);
        }

        eventLog.setFlowId(flowIdComponent.getXFlowIdValue());
        return eventLog;
    }

}