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.reifier;
018
019import java.util.Map;
020import java.util.Optional;
021import java.util.TreeMap;
022
023import org.apache.camel.CamelContext;
024import org.apache.camel.Endpoint;
025import org.apache.camel.Expression;
026import org.apache.camel.Processor;
027import org.apache.camel.RuntimeCamelException;
028import org.apache.camel.model.ProcessorDefinition;
029import org.apache.camel.model.SagaActionUriDefinition;
030import org.apache.camel.model.SagaCompletionMode;
031import org.apache.camel.model.SagaDefinition;
032import org.apache.camel.model.SagaOptionDefinition;
033import org.apache.camel.model.SagaPropagation;
034import org.apache.camel.processor.saga.SagaProcessorBuilder;
035import org.apache.camel.saga.CamelSagaService;
036import org.apache.camel.saga.CamelSagaStep;
037import org.apache.camel.spi.RouteContext;
038import org.apache.camel.support.CamelContextHelper;
039
040public class SagaReifier extends ProcessorReifier<SagaDefinition> {
041
042    public SagaReifier(ProcessorDefinition<?> definition) {
043        super((SagaDefinition)definition);
044    }
045
046    @Override
047    public Processor createProcessor(RouteContext routeContext) throws Exception {
048        Optional<Endpoint> compensationEndpoint = Optional.ofNullable(definition.getCompensation()).map(SagaActionUriDefinition::getUri).map(routeContext::resolveEndpoint);
049
050        Optional<Endpoint> completionEndpoint = Optional.ofNullable(definition.getCompletion()).map(SagaActionUriDefinition::getUri).map(routeContext::resolveEndpoint);
051
052        Map<String, Expression> optionsMap = new TreeMap<>();
053        if (definition.getOptions() != null) {
054            for (SagaOptionDefinition optionDef : definition.getOptions()) {
055                String optionName = optionDef.getOptionName();
056                Expression expr = optionDef.getExpression();
057                optionsMap.put(optionName, expr);
058            }
059        }
060
061        CamelSagaStep step = new CamelSagaStep(compensationEndpoint, completionEndpoint, optionsMap, Optional.ofNullable(definition.getTimeoutInMilliseconds()));
062
063        SagaPropagation propagation = definition.getPropagation();
064        if (propagation == null) {
065            // default propagation mode
066            propagation = SagaPropagation.REQUIRED;
067        }
068
069        SagaCompletionMode completionMode = definition.getCompletionMode();
070        if (completionMode == null) {
071            // default completion mode
072            completionMode = SagaCompletionMode.defaultCompletionMode();
073        }
074
075        Processor childProcessor = this.createChildProcessor(routeContext, true);
076        CamelSagaService camelSagaService = findSagaService(routeContext.getCamelContext());
077
078        camelSagaService.registerStep(step);
079
080        return new SagaProcessorBuilder().camelContext(routeContext.getCamelContext()).childProcessor(childProcessor).sagaService(camelSagaService).step(step)
081            .propagation(propagation(propagation)).completionMode(completionMode(completionMode)).build();
082    }
083
084    private org.apache.camel.processor.saga.SagaCompletionMode completionMode(SagaCompletionMode completionMode) {
085        return org.apache.camel.processor.saga.SagaCompletionMode.valueOf(completionMode.name());
086    }
087
088    private org.apache.camel.processor.saga.SagaPropagation propagation(SagaPropagation propagation) {
089        return org.apache.camel.processor.saga.SagaPropagation.valueOf(propagation.name());
090    }
091
092    protected CamelSagaService findSagaService(CamelContext context) {
093        CamelSagaService sagaService = definition.getSagaService();
094        if (sagaService != null) {
095            return sagaService;
096        }
097
098        sagaService = context.hasService(CamelSagaService.class);
099        if (sagaService != null) {
100            return sagaService;
101        }
102
103        sagaService = CamelContextHelper.findByType(context, CamelSagaService.class);
104        if (sagaService != null) {
105            return sagaService;
106        }
107
108        throw new RuntimeCamelException("Cannot find a CamelSagaService");
109    }
110
111}