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.ArrayList;
020import java.util.List;
021import java.util.concurrent.ExecutorService;
022
023import org.apache.camel.AggregationStrategy;
024import org.apache.camel.CamelContextAware;
025import org.apache.camel.Processor;
026import org.apache.camel.Route;
027import org.apache.camel.model.MulticastDefinition;
028import org.apache.camel.model.ProcessorDefinition;
029import org.apache.camel.processor.MulticastProcessor;
030import org.apache.camel.processor.aggregate.AggregationStrategyBeanAdapter;
031import org.apache.camel.processor.aggregate.ShareUnitOfWorkAggregationStrategy;
032import org.apache.camel.processor.aggregate.UseLatestAggregationStrategy;
033
034public class MulticastReifier extends ProcessorReifier<MulticastDefinition> {
035
036    public MulticastReifier(Route route, ProcessorDefinition<?> definition) {
037        super(route, (MulticastDefinition) definition);
038    }
039
040    @Override
041    public Processor createProcessor() throws Exception {
042        Processor answer = this.createChildProcessor(true);
043
044        // force the answer as a multicast processor even if there is only one
045        // child processor in the multicast
046        if (!(answer instanceof MulticastProcessor)) {
047            List<Processor> list = new ArrayList<>(1);
048            list.add(answer);
049            answer = createCompositeProcessor(list);
050        }
051        return answer;
052    }
053
054    @Override
055    protected Processor createCompositeProcessor(List<Processor> list) throws Exception {
056        final AggregationStrategy strategy = createAggregationStrategy();
057
058        boolean isParallelProcessing = parseBoolean(definition.getParallelProcessing(), false);
059        boolean isShareUnitOfWork = parseBoolean(definition.getShareUnitOfWork(), false);
060        boolean isStreaming = parseBoolean(definition.getStreaming(), false);
061        boolean isStopOnException = parseBoolean(definition.getStopOnException(), false);
062        boolean isParallelAggregate = parseBoolean(definition.getParallelAggregate(), false);
063        boolean isStopOnAggregateException = parseBoolean(definition.getStopOnAggregateException(), false);
064
065        boolean shutdownThreadPool = willCreateNewThreadPool(definition, isParallelProcessing);
066        ExecutorService threadPool = getConfiguredExecutorService("Multicast", definition, isParallelProcessing);
067
068        long timeout = definition.getTimeout() != null ? parseDuration(definition.getTimeout()) : 0;
069        if (timeout > 0 && !isParallelProcessing) {
070            throw new IllegalArgumentException("Timeout is used but ParallelProcessing has not been enabled.");
071        }
072        if (definition.getOnPrepareRef() != null) {
073            definition.setOnPrepare(mandatoryLookup(definition.getOnPrepareRef(), Processor.class));
074        }
075
076        MulticastProcessor answer = new MulticastProcessor(camelContext, route, list, strategy, isParallelProcessing, threadPool, shutdownThreadPool, isStreaming,
077                                                           isStopOnException, timeout, definition.getOnPrepare(), isShareUnitOfWork, isParallelAggregate,
078                                                           isStopOnAggregateException);
079        return answer;
080    }
081
082    private AggregationStrategy createAggregationStrategy() {
083        AggregationStrategy strategy = definition.getAggregationStrategy();
084        if (strategy == null && definition.getStrategyRef() != null) {
085            Object aggStrategy = lookup(parseString(definition.getStrategyRef()), Object.class);
086            if (aggStrategy instanceof AggregationStrategy) {
087                strategy = (AggregationStrategy)aggStrategy;
088            } else if (aggStrategy != null) {
089                AggregationStrategyBeanAdapter adapter = new AggregationStrategyBeanAdapter(aggStrategy, parseString(definition.getStrategyMethodName()));
090                if (definition.getStrategyMethodAllowNull() != null) {
091                    adapter.setAllowNullNewExchange(parseBoolean(definition.getStrategyMethodAllowNull(), false));
092                    adapter.setAllowNullOldExchange(parseBoolean(definition.getStrategyMethodAllowNull(), false));
093                }
094                strategy = adapter;
095            } else {
096                throw new IllegalArgumentException("Cannot find AggregationStrategy in Registry with name: " + definition.getStrategyRef());
097            }
098        }
099
100        if (strategy == null) {
101            // default to use latest aggregation strategy
102            strategy = new UseLatestAggregationStrategy();
103        }
104
105        if (strategy instanceof CamelContextAware) {
106            ((CamelContextAware)strategy).setCamelContext(camelContext);
107        }
108
109        if (parseBoolean(definition.getShareUnitOfWork(), false)) {
110            // wrap strategy in share unit of work
111            strategy = new ShareUnitOfWorkAggregationStrategy(strategy);
112        }
113
114        return strategy;
115    }
116
117}