org.apache.camel.component.saga.SagaProducer Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* 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.apache.camel.component.saga;
import org.apache.camel.AsyncCallback;
import org.apache.camel.Exchange;
import org.apache.camel.saga.CamelSagaService;
import org.apache.camel.support.CamelContextHelper;
import org.apache.camel.support.DefaultAsyncProducer;
/**
* A producer that finalizes the current saga.
*/
public class SagaProducer extends DefaultAsyncProducer {
private final boolean success;
private CamelSagaService camelSagaService;
public SagaProducer(SagaEndpoint endpoint, boolean success) {
super(endpoint);
this.success = success;
CamelSagaService sagaService = endpoint.getCamelContext().hasService(CamelSagaService.class);
if (sagaService == null) {
sagaService = CamelContextHelper.findSingleByType(endpoint.getCamelContext(), CamelSagaService.class);
}
if (sagaService == null) {
throw new IllegalStateException("Cannot find saga service: saga producers can only be used within a saga");
}
this.camelSagaService = sagaService;
}
@Override
public boolean process(Exchange exchange, AsyncCallback callback) {
String currentSaga = exchange.getIn().getHeader(SagaConstants.SAGA_LONG_RUNNING_ACTION, String.class);
if (currentSaga == null) {
exchange.setException(
new IllegalStateException("Current exchange is not bound to a saga context: cannot complete"));
callback.done(true);
return true;
}
camelSagaService.getSaga(currentSaga).thenApply(coordinator -> {
if (coordinator == null) {
throw new IllegalStateException("No coordinator found for saga id " + currentSaga);
}
return coordinator;
}).thenCompose(coordinator -> {
if (success) {
return coordinator.complete();
} else {
return coordinator.compensate();
}
}).whenComplete((res, ex) -> {
if (ex != null) {
exchange.setException(ex);
}
callback.done(false);
});
return false;
}
}