Classes in this File | Line Coverage | Branch Coverage | Complexity | |||||||
Aggregator |
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| 0.0;0 |
1 | /** |
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2 | * Licensed to the Apache Software Foundation (ASF) under one or more |
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3 | * contributor license agreements. See the NOTICE file distributed with |
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4 | * this work for additional information regarding copyright ownership. |
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5 | * The ASF licenses this file to You under the Apache License, Version 2.0 |
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6 | * (the "License"); you may not use this file except in compliance with |
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7 | * the License. You may obtain a copy of the License at |
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8 | * |
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9 | * http://www.apache.org/licenses/LICENSE-2.0 |
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10 | * |
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11 | * Unless required by applicable law or agreed to in writing, software |
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12 | * distributed under the License is distributed on an "AS IS" BASIS, |
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13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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14 | * See the License for the specific language governing permissions and |
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15 | * limitations under the License. |
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16 | */ |
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17 | package org.apache.camel.processor; |
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18 | ||
19 | import org.apache.camel.Endpoint; |
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20 | import org.apache.camel.Expression; |
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21 | import org.apache.camel.Processor; |
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22 | import org.apache.camel.processor.aggregate.AggregationCollection; |
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23 | import org.apache.camel.processor.aggregate.AggregationStrategy; |
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24 | ||
25 | /** |
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26 | * An implementation of the <a |
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27 | * href="http://activemq.apache.org/camel/aggregator.html">Aggregator</a> |
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28 | * pattern where a batch of messages are processed (up to a maximum amount or |
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29 | * until some timeout is reached) and messages for the same correlation key are |
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30 | * combined together using some kind of |
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31 | * {@link AggregationStrategy ) (by default the latest message is used) to compress |
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32 | * many message exchanges * into a smaller number of exchanges. <p/> A good |
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33 | * example of this is stock market data; you may be receiving 30,000 |
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34 | * messages/second and you may want to throttle it right down so that multiple |
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35 | * messages for the same stock are combined (or just the latest message is used |
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36 | * and older prices are discarded). Another idea is to combine line item |
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37 | * messages together into a single invoice message. |
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38 | * |
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39 | * @version $Revision: 1.1 $ |
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40 | * @param correlationExpression the expression used to calculate the correlation |
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41 | * key. For a JMS message this could be the expression |
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42 | * <code>header("JMSDestination")</code> or |
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43 | * <code>header("JMSCorrelationID")</code> |
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44 | */ |
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45 | public class Aggregator extends BatchProcessor { |
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46 | public Aggregator(Endpoint endpoint, Processor processor, Expression correlationExpression, |
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47 | AggregationStrategy aggregationStrategy) { |
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48 | 3 | this(endpoint, processor, new AggregationCollection(correlationExpression, aggregationStrategy)); |
49 | 3 | } |
50 | ||
51 | public Aggregator(Endpoint endpoint, Processor processor, AggregationCollection collection) { |
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52 | 3 | super(endpoint, processor, collection); |
53 | 3 | } |
54 | ||
55 | @Override |
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56 | public String toString() { |
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57 | 6 | return "Aggregator[to: " + getProcessor() + "]"; |
58 | } |
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59 | } |