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Apache Camel Developer's Cookbook

You're reading from  Apache Camel Developer's Cookbook

Product type Book
Published in Dec 2013
Publisher Packt
ISBN-13 9781782170303
Pages 424 pages
Edition 1st Edition
Languages

Table of Contents (20) Chapters

Apache Camel Developer's Cookbook
Credits
About the Authors
Acknowledgments
About the Reviewers
www.PacktPub.com
Preface
1. Structuring Routes 2. Message Routing 3. Routing to Your Code 4. Transformation 5. Splitting and Aggregating 6. Parallel Processing 7. Error Handling and Compensation 8. Transactions and Idempotency 9. Testing 10. Monitoring and Debugging 11. Security 12. Web Services Index

Aggregating related messages


Aggregation of related messages is a frequent use case in integration. It is also one of the more complicated cases to write by hand, since it involves state, which can be lost if you are not careful, as well as considerations like timing. Camel's implementation of the Aggregator EIP abstracts away the complexity of this task, leaving you to define the following:

  • How two exchanges ought to be aggregated into one. This is done by providing an implementation of an AggregationStrategy, which is an interface used to merge multiple exchanges together.

  • Which exchanges are to be aggregated with each other. This is defined by an expression that determines the grouping value from the exchange.

  • When an aggregation is considered complete. For this, we use one of a number of completion conditions defined through the DSL that allow us to make this decision by: an aggregated exchange count; a predicate against the aggregated, or incoming, exchange; interval since last message...

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