public async Task ExecuteBatch(ProjectionUpdateBatch batch)
{
await batch.Queue.Completion;
using (var session = (DocumentSessionBase)_store.LightweightSession())
{
try
{
await session.ExecuteBatchAsync(batch, _cancellationSource.Token);
_logger.LogInformation($"Shard '{ProjectionOrShardName}': Executed updates for {batch.Range}");
}
catch (Exception e)
{
_logger.LogError(e, $"Failure in shard '{ProjectionOrShardName}' trying to execute an update batch for {batch.Range}");
// TODO -- error handling
throw;
}
}
batch.Dispose();
Position = batch.Range.SequenceCeiling;
_tracker.Publish(new ShardState(ProjectionOrShardName, batch.Range.SequenceCeiling));
_commandBlock.Post(Command.Completed(batch.Range));
}
public async Task Stop(Exception ex = null)
{
_logger.LogInformation("Stopping projection shard '{ShardName}'", _projectionShard.Name);
_cancellationSource?.Cancel();
_commandBlock.Complete();
await _commandBlock.Completion;
_loader.Complete();
await _loader.Completion;
_hopper.Complete();
await _hopper.Completion;
try
{
await _projectionShard.Stop();
}
catch (Exception e)
{
_logger.LogError(e, "Error trying to stop shard '{ShardName}'", _projectionShard.Name);
}
_subscription.Dispose();
_fetcher.Dispose();
_subscription = null;
_fetcher = null;
_commandBlock = null;
_hopper = null;
_loader = null;
_logger.LogInformation("Stopped projection shard '{ShardName}'", _projectionShard.Name);
_tracker.Publish(new ShardState(_projectionShard.Name, Position)
{
Action = ShardAction.Stopped, Exception = null
});
}
public Task Stop(Exception ex = null)
{
_isStopping = true;
_logger.LogInformation("Stopping projection shard '{ShardName}'", _projectionShard.Name);
_cancellationSource?.Cancel();
_commandBlock.Complete();
_loader.Complete();
_grouping.Complete();
_building.Complete();
_subscription.Dispose();
_fetcher.Dispose();
_subscription = null;
_fetcher = null;
_commandBlock = null;
_grouping = null;
_loader = null;
_building = null;
_logger.LogInformation("Stopped projection shard '{ShardName}'", _projectionShard.Name);
_tracker.Publish(new ShardState(_projectionShard.Name, Position)
{
Action = ShardAction.Stopped,
Exception = ex
});
_isStopping = false;
return Task.CompletedTask;
}
