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Ditto Protocol topic structure for Policies

A valid topic consists of five elements, describing the policy affected by this message and the type of the message:

  1. namespace: the namespace of the Policy.
  2. policyName: the name of the Policy.
  3. group: the group for addressing Policies is policies.
  4. criterion: the type of Protocol messages addressing Policies is commands, for announcements it is announcements.
  5. action: the action executed on the Policy via commands criterion: create/modify, retrieve or delete.
  6. subject: for announcements the subject contains the announcement name

Policy representation

The representation of a Policy is specified as follows:


The following Policy commands are available:

Common errors to commands

Each Policy command could also result in an error response.
The "topic" of such errors differ from the command "topic" - correlation is however possible via the "correlation-id" header which is preserved in the error message.

The following table contains common error codes for Policy commands:

status Value
400 Bad Format - The request could not be completed due to malformed request syntax.
401 Unauthorized - The request could not be completed due to missing authentication.
403 Forbidden - The Policy could not be modified/deleted/retrieved as the requester had insufficient permissions.
404 Not Found - The request could not be completed. The Policy with the given ID was not found in the context of the authenticated user.
412 Precondition Failed - A precondition for reading or writing the (sub-)resource failed. This will happen for write requests, if you specified an If-Match or If-None-Match header, which fails the precondition check against the current ETag of the (sub-)resource.
413 Request Entity Too Large - The created or modified Policy is larger than the configured limit (defaults to 100 kB).
429 Too many modifying requests are already outstanding to a specific Policy.
Tags: protocol