2017-11-04 22:38:51 +01:00
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---
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layout: pattern
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title: EIP Aggregator
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folder: eip-aggregator
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permalink: /patterns/eip-aggregator/
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2017-12-25 11:30:24 +02:00
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categories: Integration
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2017-11-04 22:38:51 +01:00
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tags:
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- Java
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- Difficulty-Intermittent
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2017-12-25 11:30:24 +02:00
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- EIP
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2017-11-04 22:38:51 +01:00
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---
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## Intent
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Sometimes in enterprise systems there is a need to group incoming data in order to process it as a whole. For example
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you may need to gather offers and after defined number of offers has been received you would like to choose the one with
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the best parameters.
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Aggregator allows you to merge messages based on defined criteria and parameters. It gathers original messages,
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applies aggregation strategy and upon fulfilling given criteria, releasing merged messages.
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## Applicability
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Use the Aggregator pattern when
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* You need to combine multiple incoming messages
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* You want to process grouped data
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## Credits
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* [Gregor Hohpe, Bobby Woolf - Enterprise Integration Patterns](http://www.enterpriseintegrationpatterns.com/patterns/messaging/Aggregator.html)
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* [Apache Camel - Documentation](http://camel.apache.org/aggregator2.html)
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