Examples with ZkSubscriptionClient org.zalando.nakadi.service.subscription.zk.ZkSubscriptionClient used on opensource projects

Example 6 with ZkSubscriptionClient

use of org.zalando.nakadi.service.subscription.zk.ZkSubscriptionClient in project nakadi by zalando.

the class SubscriptionService method loadStats.

private List<SubscriptionEventTypeStats> loadStats(final Collection<EventType> eventTypes, final Optional<ZkSubscriptionNode> subscriptionNode, final ZkSubscriptionClient client, final List<PartitionEndStatistics> stats) throws ServiceTemporarilyUnavailableException, InconsistentStateException {
    final List<SubscriptionEventTypeStats> result = new ArrayList<>(eventTypes.size());
    final Collection<NakadiCursor> committedPositions = subscriptionNode.map(node -> loadCommittedPositions(node.getPartitions(), client)).orElse(Collections.emptyList());
    for (final EventType eventType : eventTypes) {
        final List<SubscriptionEventTypeStats.Partition> resultPartitions = new ArrayList<>(stats.size());
        for (final PartitionEndStatistics stat : stats) {
            final NakadiCursor lastPosition = stat.getLast();
            if (!lastPosition.getEventType().equals(eventType.getName())) {
                continue;
            }
            final Long distance = committedPositions.stream().filter(pos -> pos.getEventTypePartition().equals(lastPosition.getEventTypePartition())).findAny().map(committed -> {
                try {
                    return cursorOperationsService.calculateDistance(committed, lastPosition);
                } catch (final InvalidCursorOperation ex) {
                    throw new InconsistentStateException("Unexpected exception while calculating distance", ex);
                }
            }).orElse(null);
            final Partition.State state = subscriptionNode.map(node -> node.guessState(stat.getTimeline().getEventType(), stat.getPartition())).orElse(Partition.State.UNASSIGNED);
            final String streamId = subscriptionNode.map(node -> node.guessStream(stat.getTimeline().getEventType(), stat.getPartition())).orElse("");
            final SubscriptionEventTypeStats.Partition.AssignmentType assignmentType = subscriptionNode.map(node -> node.getPartitionAssignmentType(stat.getTimeline().getEventType(), stat.getPartition())).orElse(null);
            resultPartitions.add(new SubscriptionEventTypeStats.Partition(lastPosition.getPartition(), state.getDescription(), distance, streamId, assignmentType));
        }
        resultPartitions.sort(Comparator.comparing(SubscriptionEventTypeStats.Partition::getPartition));
        result.add(new SubscriptionEventTypeStats(eventType.getName(), resultPartitions));
    }
    return result;
}