public async Task <bool> Execute(ProjectionInput input)
{
var stores = FilterStores(input);
if (stores.IsEmpty())
{
_view.DisplayNoStoresMessage();
return(true);
}
if (input.ListFlag)
{
foreach (var store in stores)
{
_view.WriteHeader(store);
_view.ListShards(store);
}
return(true);
}
if (!input.RebuildFlag)
{
_host.ListenForUserTriggeredExit();
}
foreach (var store in stores)
{
if (store.Shards.IsEmpty())
{
break;
}
var shards = FilterShards(input, store);
if (shards.IsEmpty())
{
_view.WriteHeader(store);
_view.DisplayNoMatchingProjections();
_view.ListShards(store);
break;
}
var databases = await store.BuildDatabases().ConfigureAwait(false);
databases = FilterDatabases(input, databases);
if (databases.IsEmpty())
{
_view.DisplayNoDatabases();
break;
}
if (input.RebuildFlag)
{
_view.WriteHeader(store);
foreach (var database in databases)
{
if (databases.Count > 1)
{
_view.WriteHeader(database);
}
var status = await _host.TryRebuildShards(database, shards).ConfigureAwait(false);
if (status == RebuildStatus.NoData)
{
_view.DisplayEmptyEventsMessage(store);
}
else
{
_view.DisplayRebuildIsComplete();
}
}
}
else
{
// Only run async shards here.
shards = shards.Where(x => x.Source.Lifecycle == ProjectionLifecycle.Async).ToArray();
if (shards.IsEmpty())
{
_view.DisplayNoAsyncProjections();
_view.ListShards(store);
break;
}
foreach (var database in databases)
{
await _host.StartShards(database, shards).ConfigureAwait(false);
}
await _host.WaitForExit().ConfigureAwait(false);
}
}
return(true);
}