The FIFO resequencer is useful for applications that need sequencing based on the time the messages arrive to the Mediator. The FIFO resequencer receives a stream of messages that are in order and processes them in sequence for each group based on the arrival time of the messages.

It is important to note that the messages to outbound services of the Mediator acting as a FIFO resequencer are guaranteed to arrive in order based on arrival time. Therefore, the messages are delivered in the order they were stored in the resequencer data store.