Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||||||
Pipeline |
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| 0.0;0 |
1 | /** |
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2 | * |
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3 | * Licensed to the Apache Software Foundation (ASF) under one or more |
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4 | * contributor license agreements. See the NOTICE file distributed with |
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5 | * this work for additional information regarding copyright ownership. |
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6 | * The ASF licenses this file to You under the Apache License, Version 2.0 |
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7 | * (the "License"); you may not use this file except in compliance with |
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8 | * the License. You may obtain a copy of the License at |
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9 | * |
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10 | * http://www.apache.org/licenses/LICENSE-2.0 |
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11 | * |
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12 | * Unless required by applicable law or agreed to in writing, software |
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13 | * distributed under the License is distributed on an "AS IS" BASIS, |
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14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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15 | * See the License for the specific language governing permissions and |
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16 | * limitations under the License. |
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17 | */ |
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18 | package org.apache.camel.processor; |
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19 | ||
20 | import org.apache.camel.Endpoint; |
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21 | import org.apache.camel.Exchange; |
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22 | import org.apache.camel.Processor; |
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23 | import org.apache.camel.Producer; |
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24 | ||
25 | import java.util.Collection; |
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26 | ||
27 | /** |
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28 | * Creates a Pipeline pattern where the output of the previous step is sent as input to the next step when working |
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29 | * with request/response message exchanges. |
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30 | * |
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31 | * @version $Revision: 534145 $ |
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32 | */ |
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33 | public class Pipeline extends MulticastProcessor implements Processor { |
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34 | public Pipeline(Collection<Endpoint> endpoints) throws Exception { |
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35 | 1 | super(endpoints); |
36 | 1 | } |
37 | ||
38 | public void process(Exchange exchange) throws Exception { |
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39 | 1 | Exchange nextExchange = exchange; |
40 | 1 | boolean first = true; |
41 | 1 | for (Producer producer : getProducers()) { |
42 | 4 | if (first) { |
43 | 1 | first = false; |
44 | 1 | } |
45 | else { |
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46 | 3 | nextExchange = createNextExchange(producer, nextExchange); |
47 | } |
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48 | 4 | producer.process(nextExchange); |
49 | 4 | } |
50 | 1 | } |
51 | ||
52 | /** |
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53 | * Strategy method to create the next exchange from the |
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54 | * |
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55 | * @param producer the producer used to send to the endpoint |
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56 | * @param previousExchange the previous exchange |
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57 | * @return a new exchange |
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58 | */ |
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59 | protected Exchange createNextExchange(Producer producer, Exchange previousExchange) { |
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60 | 3 | Exchange answer = producer.createExchange(previousExchange); |
61 | ||
62 | // now lets set the input of the next exchange to the output of the previous message if it is not null |
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63 | 3 | Object output = previousExchange.getOut().getBody(); |
64 | 3 | if (output != null) { |
65 | 3 | answer.getIn().setBody(output); |
66 | } |
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67 | 3 | return answer; |
68 | } |
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69 | ||
70 | /** |
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71 | * Strategy method to copy the exchange before sending to another endpoint. Derived classes such as the |
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72 | * {@link Pipeline} will not clone the exchange |
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73 | * |
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74 | * @param exchange |
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75 | * @return the current exchange if no copying is required such as for a pipeline otherwise a new copy of the exchange is returned. |
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76 | */ |
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77 | protected Exchange copyExchangeStrategy(Exchange exchange) { |
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78 | 0 | return exchange.copy(); |
79 | } |
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80 | ||
81 | @Override |
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82 | public String toString() { |
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83 | 1 | return "Pipeline" + getEndpoints(); |
84 | } |
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85 | } |