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from("direct:start")
    .resequence(body()).batch()
    .to("mock:result");

The batch-processing resequencer can be further configured via the size() and timeout() methods.

from("direct:start")
    .resequence(body()).batch().size(300).timeout(4000L)
    .to("mock:result")

This sets the batch size to 300 and the batch timeout to 4000 ms (by default, the batch size is 100 and the timeout is 1000 ms). Alternatively, you can provide a configuration object.

from("direct:start")
    .resequence(body()).batch(new BatchResequencerConfig(300, 4000L))
    .to("mock:result")

So the above example will reorder messages from endpoint direct:a in order of their bodies, to the endpoint mock:result.
Typically you'd use a header rather than the body to order things; or maybe a part of the body. So you could replace this expression with

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from("direct:start")
    .resequence(header("seqnum")).stream().capacity(5000).timeout(4000L)
    .to("mock:result")

This sets the resequencer's capacity to 5000 and the timeout to 4000 ms (by default, the capacity is 100 and the timeout is 1000 ms). Alternatively, you can provide a configuration object.

from("direct:start")
    .resequence(header("seqnum")).stream(new StreamResequencerConfig(5000, 4000L))
    .to("mock:result")

The stream-processing resequencer algorithm is based on the detection of gaps in a message stream rather than on a fixed batch size. Gap detection in combination with timeouts removes the constraint of having to know the number of messages of a sequence (i.e. the batch size) in advance. Messages must contain a unique sequence number for which a predecessor and a successor is known. For example a message with the sequence number 3 has a predecessor message with the sequence number 2 and a successor message with the sequence number 4. The message sequence 2,3,5 has a gap because the sucessor of 3 is missing. The resequencer therefore has to retain message 5 until message 4 arrives (or a timeout occurs).

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ExpressionResultComparator<Exchange> comparator = new MyComparator();
from("direct:start")
    .resequence(header("seqnum")).stream().comparator(comparator)
    .to("mock:result");

or via a StreamResequencerConfig object.

ExpressionResultComparator<Exchange> comparator = new MyComparator();
StreamResequencerConfig config = new StreamResequencerConfig(100, 1000L, comparator);

from("direct:start")
    .resequence(header("seqnum")).stream(config)
    .to("mock:result");

Using the Spring XML Extensions

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