com.vaadin.collaborationengine.Backend.EventLog API 23.0.16 | Vaadin

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com.vaadin.collaborationengine.

Enclosing interface:

Backend
```
public static interface Backend.EventLog
```
A strictly ordered log of submitted events.

Method Summary

All Methods
Modifier and Type	Method	Description
`void`	`submitEvent(UUID trackingId, com.fasterxml.jackson.databind.node.ObjectNode eventPayload)`	Submits an event through the backend to all subscribers.
`Registration`	`subscribe(UUID newerThan, BiConsumer<UUID,com.fasterxml.jackson.databind.node.ObjectNode> eventConsumer)`	Adds a subscriber to receive all past and future events for this event log.

- Method Detail
  - submitEvent
```
void submitEvent(UUID trackingId,
                 com.fasterxml.jackson.databind.node.ObjectNode eventPayload)
```
    Submits an event through the backend to all subscribers. The tracking id needs to be delivered to active subscribers but it is not necessary to preserve it for replaying old events to new subscribers.
    
    Parameters:
    
    trackingId - the tracking id of this event, not null
    
    eventPayload - the JSON object representing the event, not null
  - subscribe
```
Registration subscribe(UUID newerThan,
                       BiConsumer<UUID,com.fasterxml.jackson.databind.node.ObjectNode> eventConsumer)
```
    Adds a subscriber to receive all past and future events for this event log. A newly added subscriber should initially receive all previous events in the log based on their original order so that it can catch up with the latest state. New events should be delivered (in order) only after all previous events have been delivered. It is not allowed to invoke the consumer again until the previous invocation has returned.
    
    Parameters:
    
    newerThan - if not null, only events after the event with the provided UUID will be considered.
    
    eventConsumer - a consumer that should receive all events, not null
    
    Returns:
    
    a registration to remove the event consumer, not null