public async Task Initialize()
{
_existingTables = await _adminClient.ListTablesAsync();
var tableNames = _existingTables.Select(x => x.Name).OrderBy(x => x);
var exampleNames = Constants.ExamplesTables.OrderBy(x => x);
NonexampleTables = tableNames.All(t => exampleNames.Contains(t));
if (exampleNames.All(tableName => tableNames.Contains(tableName)))
{
AllExampleTables = true;
}
else if (exampleNames.Any(tableName => tableNames.Contains(tableName)))
{
SomeExampleTables = true;
}
else
{
NoExampleTables = true;
}
}
public static async Task Run()
{
// Disable Grpc logging
GrpcEnvironment.DisableLogging();
try
{
// Create config
var config = Utilities.GetConfig();
// Create credentials
var credentials = await BigtableCredentials.UseApplicationDefaultCredentialsAsync();
// Admin client
using (var adminClient = new BigAdminClient(credentials, config))
{
// Get tables
var tables = (await adminClient.ListTablesAsync()).ToArray();
// Ensure pricing table exists
if (tables.All(t => t.Name != Constants.PricingTable))
{
// Inform user
CommandLine.InformUser("Setup", "Missing example table. Please run the Examples.Bootstrap project.");
// Hard stop
return;
}
// Show user
CommandLine.DisplayTables(tables);
}
// Wait for keypress
CommandLine.WaitForUserAndThen("scan for rows");
// Data client
using (var dataClient = new BigDataClient(credentials, config))
{
// Target
var pricingTable = new BigTable(Constants.PricingTable);
// Scan pricing table
var pricing = await dataClient.GetRowsAsync(pricingTable, Constants.ScanKeyStart, Constants.ScanKeyEnd, Constants.ScanLimit);
// Show the user
CommandLine.DisplayRows(pricing);
// Wait for keypress
CommandLine.WaitForUserAndThen("observe rows");
// Test observables
var waitSource = new CancellationTokenSource();
// ReSharper disable once MethodSupportsCancellation
var waitForObservation = Task.Run(() => Task.Delay(-1, waitSource.Token));
// Create a subscriber
var subscriber = new TestSubscriber(() => waitSource.Cancel());
// ReSharper disable once MethodSupportsCancellation
var observable = dataClient.ObserveRows(pricingTable, Constants.ScanKeyStart, Constants.ScanKeyEnd, Constants.ScanLimit);
using (observable.Subscribe(subscriber))
{
//await Task.Delay(1000);
Task.WaitAny(waitForObservation);
}
// Wait for keypress
CommandLine.WaitForUserAndThen("seek for row");
// Seek for data
var row = await dataClient.GetRowAsync(pricingTable, Constants.SeekKey);
// Show the user
CommandLine.DisplayRows(new[] { row });
}
}
catch (Exception exception)
{
CommandLine.InformUser("Oops", "Example didn't work out as planned");
CommandLine.RenderException(exception);
}
finally
{
// All done
CommandLine.WaitForUserAndThen("exit");
}
}