Talend ESB Mediation Developer Guide

Talend ESB
Installation and Upgrade
Design and Development
Talend ESB

The Resequencer from the EIP patterns allows you to reorganise messages based on some comparator. By default in Camel we use an Expression to create the comparator; so that you can compare by a message header or the body or a piece of a message etc.

Camel supports two resequencing algorithms:

  • Batch resequencing collects messages into a batch, sorts the messages and sends them to their output.

  • Stream resequencing re-orders (continuous) message streams based on the detection of gaps between messages.

By default the Resequencer does not support duplicate messages and will only keep the last message, in case a message arrives with the same message expression. However in the batch mode you can enable it to allow duplicates. For Batch mode, in Java DSL there is a allowDuplicates() method and in Spring XML there is an allowDuplicates=true attribute on the <batch-config/> you can use to enable it.