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This option is available for both batch and stream resequencer.

Reject Old Exchanges

Available as of Camel 2.11

This option can be used to preserve ordering regardless of the event that delivered messages downstream (capacity, timeout, etc). If enabled using rejectOld(), the Resequencer will throw a MessageRejectedException when an incoming Exchange is "older" (based on the Comparator) than the last delivered message. This provides an extra level of control with regards to delayed message ordering.

from("direct:start")
    .onException(MessageRejectedException.class).handled(true).to("mock:error").end()
    .resequence(header("seqno")).stream().timeout(1000).rejectOld()
    .to("mock:result");

This option is available for the stream resequencer only.

Stream Resequencing

The next example shows how to use the stream-processing resequencer. Messages are re-ordered based on their sequence numbers given by a seqnum header using gap detection and timeouts on the level of individual messages.

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