public DataService(ILogger <DataService> logger, TodoRepository todoRepository, RetryPolicyHandler retryPolicyHandler, ResilienceSettings resilienceSettings)
{
_logger = logger;
_todoRepository = todoRepository;
_retryPolicyHandler = retryPolicyHandler;
_resilienceSettings = resilienceSettings;
}
public void ResiliencePolicyManager_WhenRequestIsWorthRetrying_RequestIsRetriedAccordingToSettings()
{
var AMOUNT_OF_RETRIES = 3;
var resilienceSettings = new ResilienceSettings()
{
AmountOfRetries = AMOUNT_OF_RETRIES, BreakerAttemptThreshold = AMOUNT_OF_RETRIES * 2, CircuitBreakerTrippedTimeoutInSeconds = 10
};
var sut = new ResiliencePolicyManager(resilienceSettings);
var expected = 1 + AMOUNT_OF_RETRIES;
int actual = 0;
var func = new Func <IRestResponse>(
() =>
{
actual++;
return(new RestResponse {
StatusCode = sut.StatusCodesWorthRetrying.First()
});
}
);
sut.ResiliencePolicy.Execute(func);
Assert.Equal(actual, expected);
}
public MockDbInteractorFacade(
ResilienceSettings resilienceSettings,
Action <MySqlException, TimeSpan> onRetry)
{
this.resilienceSettings = resilienceSettings;
this.onRetry = onRetry;
}
static void Main(string[] args)
{
Log.Logger = new LoggerConfiguration()
.WriteTo.ColoredConsole()
.CreateLogger();
var container = new Container();
container.RegisterSingleton <PlaygroundCoordinator>();
container.RegisterSingleton <IResiliencePatternRepository, ResiliencePatternRepository>();
container.RegisterSingleton <IResiliencePolicyManager, ResiliencePolicyManager>();
var resilienceSettings = new ResilienceSettings()
{
AmountOfRetries = 3,
BreakerAttemptThreshold = 2,
CircuitBreakerTrippedTimeoutInSeconds = 1,
};
container.RegisterSingleton <IResilienceSettings>(resilienceSettings);
var playgroundCoordinator = container.GetInstance <PlaygroundCoordinator>();
playgroundCoordinator.HaveSomeFun();
Console.ReadKey();
}
/// <summary>
/// Asynchronous retry policy that returns Task of <typeparamref name="T"/>
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="action"></param>
/// <param name="customResilienceSettings"></param>
/// <param name="onRetry"></param>
/// <returns></returns>
protected async Task <T> ExecuteWithAsyncRetries <T>(
Func <Task <T> > action,
ResilienceSettings customResilienceSettings = null,
Action <MySqlException, TimeSpan> onRetry = null) =>
await MySqlFailoverRetryPolicies
.DefaultAsyncPolicy(
customResilienceSettings,
onRetry)
.ExecuteAsync(async() =>
{
try
{
return(await action());
}
catch (MySqlException ex)
{
ClearConnectionPoolIfDatabaseFailingOver(ex);
throw;
}
});
/// <summary>
/// Synchronous retry policy of void return type
/// </summary>
/// <param name="action"></param>
/// <param name="customResilienceSettings"></param>
/// <param name="onRetry"></param>
protected void ExecuteWithSyncRetries(
Action action,
ResilienceSettings customResilienceSettings = null,
Action <MySqlException, TimeSpan> onRetry = null) =>
MySqlFailoverRetryPolicies
.DefaultSyncPolicy(
customResilienceSettings,
onRetry)
.Execute(() =>
{
try
{
action();
}
catch (MySqlException ex)
{
ClearConnectionPoolIfDatabaseFailingOver(ex);
throw;
}
});
public void ResiliencePolicyManager_WhenRequestFailsTooManyTimes_CircuitBreakerIsTripped()
{
var AMOUNT_OF_RETRIES = 10;
var BREAKER_ATTEMPT_THRESHOLD = 3;
var resilienceSettings = new ResilienceSettings()
{
AmountOfRetries = AMOUNT_OF_RETRIES, BreakerAttemptThreshold = BREAKER_ATTEMPT_THRESHOLD, CircuitBreakerTrippedTimeoutInSeconds = 10
};
var sut = new ResiliencePolicyManager(resilienceSettings);
var expected = BREAKER_ATTEMPT_THRESHOLD;
var func = new Func <IRestResponse>(
() =>
{
return(new RestResponse {
StatusCode = sut.StatusCodesWorthRetrying.First()
});
}
);
Assert.Throws <BrokenCircuitException <IRestResponse> >(() => sut.ResiliencePolicy.Execute(func));
}
public DefaultResiliencePolicy(ILogger logger, ResilienceSettings resilienceSettings = default(ResilienceSettings))
{
this.logger = logger;
this.resilienceSettings = resilienceSettings ?? ResilienceSettings.Default;
}
