| 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 | } |