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CloudEventConsumer.java
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CloudEventConsumer.java
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/*
* Copyright 2020 Red Hat, Inc. and/or its affiliates.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.kie.kogito.event.impl;
import java.util.Optional;
import java.util.function.Function;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.kie.kogito.Application;
import org.kie.kogito.Model;
import org.kie.kogito.process.Process;
import org.kie.kogito.process.ProcessInstance;
import org.kie.kogito.process.impl.Sig;
import org.kie.kogito.services.event.AbstractProcessDataEvent;
import org.kie.kogito.services.uow.UnitOfWorkExecutor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class CloudEventConsumer<D, M extends Model, T extends AbstractProcessDataEvent<D>> extends JacksonEventConsumer<M> {
private static final Logger logger = LoggerFactory.getLogger(CloudEventConsumer.class);
private Function<D, M> function;
private final Class<D> dataEventClass;
private Class<T> cloudEventClass;
public CloudEventConsumer(Function<D, M> function, Class<D> dataEventClass, Class<T> cloudEventClass, ObjectMapper mapper) {
super(mapper);
this.function = function;
this.dataEventClass = dataEventClass;
this.cloudEventClass = cloudEventClass;
}
@Override
public void consume(Application application, Process<M> process, String payload, String trigger) {
String simpleName = cloudEventClass.getSimpleName();
try {
T cloudEvent = mapper.readValue(payload, cloudEventClass);
M model = function.apply(cloudEvent.getData());
// currently we filter out messages on the receiving end; for strategy see https://issues.redhat.com/browse/KOGITO-3591
if (ignoredMessageType(cloudEvent, simpleName) && ignoredMessageType(cloudEvent, trigger)) {
logger.warn("Consumer for CloudEvent type '{}', trigger '{}': ignoring message with type '{}', source '{}'",
simpleName,
trigger,
cloudEvent.getType(),
cloudEvent.getSource());
return;
}
UnitOfWorkExecutor.executeInUnitOfWork(application.unitOfWorkManager(), () -> {
if (cloudEvent.getKogitoReferenceId() != null) {
logger.debug("Received message with reference id '{}' going to use it to send signal '{}'",
cloudEvent.getKogitoReferenceId(),
trigger);
Optional<ProcessInstance<M>> instance = process.instances().findById(cloudEvent.getKogitoReferenceId());
if(instance.isPresent()){
instance.get().send(Sig.of("Message-" + trigger,
cloudEvent.getData(),
cloudEvent.getKogitoProcessinstanceId()));
} else {
logger.warn("Process instance with id '{}' not found for triggering signal '{}'",
cloudEvent.getKogitoReferenceId(),
trigger);
}
} else {
logger.debug("Received message without reference id, staring new process instance with trigger '{}'",
trigger);
ProcessInstance<M> pi = process.createInstance(model);
if (cloudEvent.getKogitoStartFromNode() != null) {
pi.startFrom(cloudEvent.getKogitoStartFromNode(), cloudEvent.getKogitoProcessinstanceId());
} else {
pi.start(trigger, cloudEvent.getKogitoProcessinstanceId());
}
}
return null;
});
} catch (JsonProcessingException e) {
logger.warn("Consumer for CloudEvent type '{}', trigger '{}': ignoring payload '{}'",
simpleName,
trigger,
payload);
}
}
private boolean ignoredMessageType(T cloudEvent, String type) {
return !type.equals(cloudEvent.getType()) && !type.equals(cloudEvent.getSource());
}
}