FME Flow: 2026.3

FME Flow Topic

The FME Flow Topic trigger sends messages generated from FME Flow Notification Service Topics.

The FME Flow Topic trigger has two output ports. The success port (✔) can send a message if the trigger fails. The failure port (x) can send a message if the trigger succeeds.

Note  Use the Topic trigger only to initiate a workflow, or a portion of a workflow. It is otherwise not necessary to explicitly define topics for a workflow to run.

Parameters

Note  See also Working with Parameters in Automations Workflows.
  • Topics: Select the topic(s) you want to send messages.

Output Attributes

See Also

Accessing Topic Messages

FME Flow topics store incoming messages as JSON-formatted strings. If a topic message was generated as plain text, it is stored under the attribute subscriber_content. If a topic message was generated as JSON, it is stored under the applicable JSON attribute.

Other Attributes

Attribute Description
time

Event time
source Event type
error.type

(Failure port only) Error type:

  • InvalidMessage: An error occurred while configuring this component, such as missing or malformed values.
  • DeadLetter: An error occured while connecting to an external resource. Examples may include connection issues, invalid credentials, or generic external resource exceptions.
error.message (Failure port only) Error message