Spring Integration poller starting same Spring Batch job multiple times - spring-batch

Question

Our application uses Spring Integration to kick off a Spring Batch job.
It works as follows:
1) The main application class is run, and this loads the Spring application context.
2) A Spring Integration bean is configured to read a file from the file system, and to place the file on a channel.
<int-file:inbound-channel-adapter
directory="${...}" channel="channel"
filename-pattern="*.csv" auto-create-directory="false" prevent-duplicates="true">
<int:poller fixed-delay="${...}"></int:poller>
</int-file:inbound-channel-adapter>
3) The channel connects to a #ServiceActivator bean.
<int:service-activator input-channel="channel" ref="launcher" />
4) The Launcher bean gets the file from the message payload, and launches the Spring Batch job.
The problem is that after the poller fixed-delay time has elapsed, the launcher bean will be called again, and a new Job will be started with the same parameters.
This throws a JobInstanceAlreadyCompleteException.
I do not see anyway to tell the poller to only run once.
What is the recommended way to use Spring Integration and Spring Batch together to avoid this issue?
Thanks