We've seen situations where the receiving side of a WAN gateway is slow to accept data or is not accepting any data.  This can cause queues to fill up on the sending side.  If disk-overflow is being used this can even lead to an outage.  Some users are concerned more with the latest data and don't really care if old data is thrown away in this situation.  They may have set a TTL on their Regions and would like to be able to do the same thing with their GatewaySenders.

With that in mind I'd like to add this method to GatewaySenderFactory:

/** * Sets the timeToLive expiration attribute for queue entries for the next * {@code GatewaySender} created. * * @param timeToLive the timeToLive ExpirationAttributes for entries in this region * @return a reference to this GatewaySenderFactory object * @throws IllegalArgumentException if timeToLive is null * @see RegionFactory#setEntryTimeToLive */ public GatewaySenderFactory setEntryTimeToLive(ExpirationAttributes timeToLive);

The exact implementation may not be the same as for Regions since we probably want to expire the oldest entries first and make sure we do so in their order in the queue.

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