001/**
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.camel.processor.saga;
018
019import org.apache.camel.AsyncCallback;
020import org.apache.camel.CamelContext;
021import org.apache.camel.Exchange;
022import org.apache.camel.Processor;
023import org.apache.camel.model.SagaCompletionMode;
024import org.apache.camel.saga.CamelSagaService;
025import org.apache.camel.saga.CamelSagaStep;
026
027/**
028 * Saga processor implementing the SUPPORTS propagation mode.
029 */
030public class SupportsSagaProcessor extends SagaProcessor {
031
032    public SupportsSagaProcessor(CamelContext camelContext, Processor childProcessor, CamelSagaService sagaService, SagaCompletionMode completionMode, CamelSagaStep step) {
033        super(camelContext, childProcessor, sagaService, completionMode, step);
034        if (completionMode != null && completionMode != SagaCompletionMode.defaultCompletionMode()) {
035            throw new IllegalArgumentException("CompletionMode cannot be specified when propagation is SUPPORTS");
036        }
037    }
038
039    @Override
040    public boolean process(Exchange exchange, AsyncCallback callback) {
041        getCurrentSagaCoordinator(exchange).whenComplete((coordinator, ex) -> ifNotException(ex, exchange, callback, () -> {
042            if (coordinator != null) {
043                coordinator.beginStep(exchange, step).whenComplete((done, ex2) -> ifNotException(ex2, exchange, callback, () -> {
044                    // Never completes the saga
045                    super.process(exchange, doneSync -> callback.done(false));
046                }));
047            } else {
048                super.process(exchange, doneSync -> callback.done(false));
049            }
050        }));
051        return false;
052    }
053}