/// <summary>
/// Scan the database for changes to tenants (their servers and / or databases).
/// </summary>
/// <returns>
/// A <see cref="Task"/> representing the operation.
/// </returns>
async Task ScanTenants()
{
Log.Debug("Scanning tenants...");
using (IAsyncDocumentSession session = DocumentStore.OpenAsyncSession())
{
List <DatabaseServer> servers = await session.Query <DatabaseServer>().ToListAsync();
foreach (DatabaseServer server in servers)
{
Log.Debug("Discovered database server {ServerId} (Name:{ServerName}) owned by tenant {TenantId}.",
server.Id,
server.Name,
server.TenantId
);
IActorRef serverManager;
if (!_serverManagers.TryGetValue(server.Id, out serverManager))
{
serverManager = Context.ActorOf(
Context.DI().Props <TenantServerManager>()
.WithSupervisorStrategy(StandardSupervision.Default),
name: TenantServerManager.ActorName(server.Id)
);
Context.Watch(serverManager);
_serverManagers.Add(server.Id, serverManager);
serverManager.Tell(new TenantServerManager.Initialize(
initialState: server,
dataAccess: Self
));
Log.Info("Created TenantServerManager {ActorName} for server {ServerId} (Tenant:{TenantId}).",
serverManager.Path.Name,
server.Id,
server.TenantId
);
}
else
{
Log.Debug("Notifying TenantServerManager {ActorName} of current configuration for server {ServerId}.", serverManager.Path.Name, server.Id);
serverManager.Tell(
server.Clone()
);
}
Dictionary <string, DatabaseInstance> databases = await session.LoadAsync <DatabaseInstance>(server.DatabaseIds);
foreach (string databaseId in databases.Keys)
{
DatabaseInstance database = databases[databaseId];
if (database == null)
{
Log.Warning("Server {ServerId} in management database refers to non-existent database {DatabaseId}.",
server.Id,
databaseId
);
continue;
}
Log.Debug("Notifying TenantServerManager {ActorName} of current configuration for database {DatabaseId} in server {ServerId}.",
serverManager.Path.Name,
database.Id,
server.Id
);
serverManager.Tell(
database.Clone()
);
}
}
}
Log.Debug("Tenant scan complete.");
}
