| 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 | } |