layout	title	folder	permalink	categories	tags
pattern	EIP Aggregator	eip-aggregator	/patterns/eip-aggregator/	Integration	Enterprise Integration Pattern

Intent

Sometimes in enterprise systems there is a need to group incoming data in order to process it as a whole. For example you may need to gather offers and after defined number of offers has been received you would like to choose the one with the best parameters.

Aggregator allows you to merge messages based on defined criteria and parameters. It gathers original messages, applies aggregation strategy and upon fulfilling given criteria, releasing merged messages.

Diagram

Applicability

Use the Aggregator pattern when

• You need to combine multiple incoming messages
• You want to process grouped data

Credits

• Gregor Hohpe, Bobby Woolf - Enterprise Integration Patterns
• Apache Camel - Documentation
• Enterprise Integration Patterns: Designing, Building, and Deploying Messaging Solutions