onDeliveryFailuremessage

onDeliveryFailuremessage is a term used to describe a callback or event in messaging and integration systems that is triggered when a message delivery attempt cannot be completed successfully. It denotes the mechanism by which a system notifies an application or service that a specific message could not be delivered to its intended destination or endpoint.

In practice, the onDeliveryFailuremessage event conveys information about the failed delivery, such as the message identifier, destination address or queue, the reason for failure (error code or exception message), timestamp, and the number of delivery attempts. Depending on the system, this event may be emitted after a single failed attempt or after exceeding a configured retry limit. The data provided may also include routing context and metadata to help diagnose the issue.

Common uses of onDeliveryFailuremessage include logging the failure for audit trails, triggering alerts to operators, initiating retry policies with backoff, or routing the failed message to a dead-letter or poison queue for later inspection and manual remediation. It is typically paired with corresponding success and retry events to give a complete picture of message delivery lifecycle.

Key considerations when implementing or consuming onDeliveryFailuremessage include ensuring idempotent handling of retries, avoiding side effects on repeated deliveries, securing sensitive payload information in logs, and implementing clear policies for when to retry versus when to escalate or dead-letter. The exact behavior and data schema of onDeliveryFailuremessage can vary between messaging platforms and frameworks.