// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(
IApplicationBuilder app,
IWebHostEnvironment env,
IFlakyStartupService flaky,
IQuickStartupService quick,
ISlowStartupService slow,
ILogger <Startup> logger)
{
// Starting services in same order: Flaky -> Slow -> Quick
//StartServicesAsyncWithAwait(flaky, quick, slow, logger).GetAwaiter().GetResult();
//StartServicesAsyncInParallel(flaky, quick, slow, logger).GetAwaiter().GetResult();
//StartServicesTasks(flaky, quick, slow, logger).GetAwaiter().GetResult();
//StartServicesSync(flaky, quick, slow, logger);
//StartServicesAsyncInSync(flaky, quick, slow, logger);
Console.WriteLine("Doing other stuff....");
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
app.UseHttpsRedirection();
app.UseRouting();
app.UseAuthorization();
app.UseEndpoints(endpoints =>
{
endpoints.MapControllers();
});
}
private void StartServicesAsyncInSync(
IFlakyStartupService flaky,
IQuickStartupService quick,
ISlowStartupService slow,
ILogger <Startup> logger)
{
logger.LogInformation("Starting Polly Stuff");
var cancellationTokenSource = new CancellationTokenSource();
// Starts tasks if function is really async (needs await)
AsyncRetryPolicy.ExecuteAsync(() => flaky.Start(cancellationTokenSource.Token));
AsyncRetryPolicy.ExecuteAsync(() => slow.Start(cancellationTokenSource.Token));
AsyncRetryPolicy.ExecuteAsync(() => quick.Start(cancellationTokenSource.Token));
}
private void StartServicesSync(
IFlakyStartupService flaky,
IQuickStartupService quick,
ISlowStartupService slow,
ILogger <Startup> logger)
{
logger.LogInformation("Starting Polly Stuff");
var cancellationTokenSource = new CancellationTokenSource();
// Calls block the executing thread.
// Flaky has to finish before Slow starts
// Slow has to finish before Quick starts
RetryPolicy.Execute(() => flaky.Start(cancellationTokenSource.Token));
RetryPolicy.Execute(() => slow.Start(cancellationTokenSource.Token));
RetryPolicy.Execute(() => quick.Start(cancellationTokenSource.Token));
}
private async Task StartServicesAsyncWithAwait(
IFlakyStartupService flaky,
IQuickStartupService quick,
ISlowStartupService slow,
ILogger <Startup> logger)
{
logger.LogInformation("Starting Polly Stuff");
var cancellationTokenSource = new CancellationTokenSource();
// Awaits block the executing thread.
// Flaky has to finish before Slow starts
// Slow has to finish before Quick starts
await AsyncRetryPolicy.ExecuteAsync(() => flaky.Start(cancellationTokenSource.Token));
await AsyncRetryPolicy.ExecuteAsync(() => slow.Start(cancellationTokenSource.Token));
await AsyncRetryPolicy.ExecuteAsync(() => quick.Start(cancellationTokenSource.Token));
}
private Task StartServicesTasks(
IFlakyStartupService flaky,
IQuickStartupService quick,
ISlowStartupService slow,
ILogger <Startup> logger)
{
logger.LogInformation("Starting Polly Stuff");
var cancellationTokenSource = new CancellationTokenSource();
// Awaits block the executing thread.
// Flaky has to finish before Slow starts
// Slow has to finish before Quick starts
// possible return values are not available due to missing await
var t1 = AsyncRetryPolicy.ExecuteAsync(() => flaky.Start(cancellationTokenSource.Token));
var t2 = AsyncRetryPolicy.ExecuteAsync(() => slow.Start(cancellationTokenSource.Token));
var t3 = AsyncRetryPolicy.ExecuteAsync(() => quick.Start(cancellationTokenSource.Token));
return(Task.WhenAll(new[] { t1, t2, t3 }));
}
private async Task StartServicesAsyncInParallel(
IFlakyStartupService flaky,
IQuickStartupService quick,
ISlowStartupService slow,
ILogger <Startup> logger)
{
logger.LogInformation("Starting Polly Stuff");
var cancellationTokenSource = new CancellationTokenSource();
// Execution tasks are started in parallel if thread has enough capacities
// Flaky or Fast finish first
// Slow and Flaky do not block
var t1 = AsyncRetryPolicy.ExecuteAsync(() => flaky.Start(cancellationTokenSource.Token));
var t2 = AsyncRetryPolicy.ExecuteAsync(() => slow.Start(cancellationTokenSource.Token));
var t3 = AsyncRetryPolicy.ExecuteAsync(() => quick.Start(cancellationTokenSource.Token));
await t1;
await t2;
await t3;
}
