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The Code generation for Automatiko Engine
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package com.myspace.demo;
import java.util.TimeZone;
import java.util.concurrent.CompletionStage;
import java.util.function.Function;
import java.util.Collection;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Optional;
import io.automatiko.engine.api.Application;
import io.automatiko.engine.api.auth.IdentityProvider;
import io.automatiko.engine.api.auth.TrustedIdentityProvider;
import io.automatiko.engine.api.event.AbstractDataEvent;
import io.automatiko.engine.api.event.DataEvent;
import io.automatiko.engine.api.workflow.Process;
import io.automatiko.engine.api.workflow.ProcessInstance;
import io.automatiko.engine.api.workflow.ProcessInstanceDuplicatedException;
import io.automatiko.engine.workflow.Sig;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.util.StdDateFormat;
import org.eclipse.microprofile.reactive.messaging.Message;
@SuppressWarnings({ "rawtypes", "unchecked" })
public class $Type$MessageConsumer {
private static final Logger LOGGER = LoggerFactory.getLogger("MessageConsumer");
Process<$Type$> process;
Application application;
Optional useCloudEvents = Optional.of(false);
jakarta.enterprise.inject.Instance> converter;
@jakarta.inject.Inject
ObjectMapper json;
@jakarta.inject.Inject
io.automatiko.engine.service.metrics.ProcessMessagingMetrics metrics;
public void configure() {
}
@io.smallrye.reactive.messaging.annotations.Blocking
public CompletionStage consume(Message msg) {
metrics.messageReceived(CONNECTOR, MESSAGE, ((io.automatiko.engine.workflow.AbstractProcess)process).process());
final String trigger = "$Trigger$";
try {
IdentityProvider.set(new TrustedIdentityProvider("System"));
final $DataType$ eventData;
final $Type$ model;
final String correlation;
LOGGER.debug("Received message with payload '{}'", msg.getPayload());
boolean accepted;
if (useCloudEvents.orElse(false)) {
$DataEventType$ event;
String contentType = contentType(msg);
model = new $Type$();
if (contentType.startsWith("application/cloudevents+json")) {
// structured
event = json.readValue(msg.getPayload(), $DataEventType$.class);
eventData = event.getData();
} else {
// binary
eventData = convert(msg, $DataType$.class);
event = new $DataEventType$(appProperty(msg, "cloudEvents:specversion"), appProperty(msg, "cloudEvents:id"), appProperty(msg, "cloudEvents:source"), appProperty(msg, "cloudEvents:type"), appProperty(msg, "cloudEvents:subject"), appProperty(msg, "cloudEvents:time"), eventData);
cloudEventsExtensions(msg, event);
}
accepted = acceptedEvent(event, msg);
if (!accepted) {
metrics.messageRejected(CONNECTOR, MESSAGE, ((io.automatiko.engine.workflow.AbstractProcess)process).process());
LOGGER.debug("Message has been rejected by filter expression");
return msg.ack();
}
correlation = correlationEvent(event, msg);
} else {
eventData = convert(msg, $DataType$.class);
model = new $Type$();
accepted = acceptedPayload(eventData, msg);
if (!accepted) {
metrics.messageRejected(CONNECTOR, MESSAGE, ((io.automatiko.engine.workflow.AbstractProcess)process).process());
LOGGER.debug("Message has been rejected by filter expression");
return msg.ack();
}
correlation = correlationPayload(eventData, msg);
}
io.automatiko.engine.services.uow.UnitOfWorkExecutor.executeInUnitOfWork(application.unitOfWorkManager(), () -> {
if (correlation != null) {
LOGGER.debug("Correlation ({}) is set, attempting to find if there is matching instance already active", correlation);
Collection possiblyFound = process.instances().findByIdOrTag(io.automatiko.engine.api.workflow.ProcessInstanceReadMode.MUTABLE_WITH_LOCK, correlation);
if (!possiblyFound.isEmpty()) {
metrics.messageConsumed(CONNECTOR, MESSAGE, ((io.automatiko.engine.workflow.AbstractProcess)process).process());
possiblyFound.forEach(pi -> {
ProcessInstance pInstance = (ProcessInstance) pi;
LOGGER.debug("Found process instance {} matching correlation {}, signaling instead of starting new instance", pInstance.id(), correlation);
pInstance.send(Sig.of(canStartInstance() ? trigger : "Message-" + trigger, eventData));
});
return null;
}
}
if (canStartInstance()) {
LOGGER.debug("Received message without reference id and no correlation is set/matched, staring new process instance with trigger '{}'", trigger);
metrics.messageConsumed(CONNECTOR, MESSAGE, ((io.automatiko.engine.workflow.AbstractProcess)process).process());
try {
ProcessInstance<$Type$> pi = process.createInstance(correlation, model);
pi.start(trigger, null, eventData);
} catch (ProcessInstanceDuplicatedException e) {
ProcessInstance<$Type$> pi = process.instances().findById(correlation, io.automatiko.engine.api.workflow.ProcessInstanceReadMode.MUTABLE_WITH_LOCK).get();
pi.send(Sig.of(trigger, eventData));
}
} else {
metrics.messageMissed(CONNECTOR, MESSAGE, ((io.automatiko.engine.workflow.AbstractProcess)process).process());
LOGGER.warn("Received message without reference id and no correlation is set/matched, for trigger not capable of starting new instance '{}'", trigger);
}
return null;
});
return msg.ack();
} catch (Exception e) {
metrics.messageFailed(CONNECTOR, MESSAGE, ((io.automatiko.engine.workflow.AbstractProcess)process).process());
LOGGER.error("Error when consuming message for process {}", process.id(), e);
return msg.nack(e);
}
}
protected String correlationPayload(Object eventData, Message message) {
return null;
}
protected String correlationEvent(io.automatiko.engine.api.event.AbstractDataEvent eventData, Message message) {
return null;
}
protected boolean acceptedPayload(Object eventData, Message message) {
return true;
}
protected boolean acceptedEvent(io.automatiko.engine.api.event.AbstractDataEvent eventData, Message message) {
return true;
}
protected $DataType$ convert(Message message, Class clazz) throws Exception {
if (converter != null && !converter.isUnsatisfied()) {
return converter.get().convert(message);
}
return ($DataType$) json.readValue(message.getPayload(), $DataType$.class);
}
protected String contentType(Message message) {
io.smallrye.reactive.messaging.rabbitmq.IncomingRabbitMQMetadata metadata = message.getMetadata(io.smallrye.reactive.messaging.rabbitmq.IncomingRabbitMQMetadata.class).orElse(null);
if (metadata == null) {
return "application/json; charset=UTF-8";
}
return metadata.getContentType().orElse("application/json; charset=UTF-8");
}
protected String appProperty(Message message, String name) {
io.smallrye.reactive.messaging.rabbitmq.IncomingRabbitMQMetadata metadata = message.getMetadata(io.smallrye.reactive.messaging.rabbitmq.IncomingRabbitMQMetadata.class).orElse(null);
if (metadata == null || metadata.getHeaders() == null) {
return null;
}
return metadata.getHeader(name, String.class).orElse(null);
}
protected void cloudEventsExtensions(Message message, $DataEventType$ event) {
io.smallrye.reactive.messaging.rabbitmq.IncomingRabbitMQMetadata metadata = message.getMetadata(io.smallrye.reactive.messaging.rabbitmq.IncomingRabbitMQMetadata.class).orElse(null);
if (metadata == null || metadata.getHeaders() == null) {
return;
}
for (Entry header : metadata.getHeaders().entrySet()) {
if (header.getKey().startsWith("cloudEvents:")) {
event.addExtension(header.getKey().replaceFirst("cloudEvents:", ""), header.getValue().toString());
}
}
}
}