Acknowledge that a member has successfully handled all events up to and including the timestamp provided. Makes earlier events for this member available for pruning. The timestamp is in sequencer time and will likely correspond to an event that the client has processed however this is not validated. It is assumed that members in consecutive calls will never acknowledge an earlier timestamp however this is also not validated (and could be invalid if the member has many subscriptions from the same or many processes). It is expected that members will periodically call this endpoint with their latest clean timestamp rather than calling it for every event they process. The default interval is in the range of once a minute.

Blocks until all earlier tasks have completed and then prevents further tasks from being run.

Disable the provided member. Should prevent them from reading or writing in the future (although they can still be addressed). Their unread data can also be pruned. Effectively disables all instances of this member.

First check is the member is registered and if not call registerMember

Return a structure indicating the health status of the sequencer implementation. Should succeed even if the configured datastore is unavailable.

Check whether we're closing. Susceptible to race conditions; unless you're using using this as a flag to the retry lib or you really know what you're doing, prefer performUnlessClosing and friends.

track running futures on shutdown

set to true to get detailed information about all futures that did not complete during shutdown. if set to false, we don't do anything.

Performs the task given by f unless a shutdown has been initiated. The shutdown will only begin after f completes, but other tasks may execute concurrently with f, if started using this function, or one of the other variants (performUnlessClosingF and performUnlessClosingEitherT). The tasks are assumed to take less than closingTimeout to complete.

Performs the EitherT[Future] given by etf unless a shutdown has been initiated, in which case the provided error is returned instead. Both etf and the error are lazy; etf is only evaluated if there is no shutdown, the error only if we're shutting down. The shutdown will only begin after etf completes, but other tasks may execute concurrently with etf, if started using this function, or one of the other variants (performUnlessClosing and performUnlessClosingF). The tasks are assumed to take less than closingTimeout to complete.

Performs the Future given by f unless a shutdown has been initiated. The future is lazy and not evaluated during shutdown. The shutdown will only begin after f completes, but other tasks may execute concurrently with f, if started using this function, or one of the other variants (performUnlessClosing and performUnlessClosingEitherT). The tasks are assumed to take less than closingTimeout to complete.

Prune as much sequencer data as safely possible without breaking operation (except for members that have been previously flagged as disabled). Sequencers are permitted to prune to an earlier timestamp if required to for their own consistency. For example, the Database Sequencer will adjust this time to a potentially earlier point in time where counter checkpoints are available for all members (who aren't being ignored).

Return a structure containing the members registered with the sequencer and the latest positions of clients reading events.

Register a task that will run onClose after all "performUnlessShutdown" tasks have finished

Return a snapshot state that other newly onboarded sequencers can use as an initial state from which to support serving events. This state depends on the provided timestamp and will contain registered members, counters per member, latest timestamp (which will be greater than or equal to the provided timestamp) as well as a sequencer implementation specific piece of information such that all together form the point after which the new sequencer can safely operate. The provided timestamp is typically the timestamp of the requesting sequencer's private key, which is the point in time where it can effectively sign events.