public ExecutionState(StorageCommandBase <T> cmd, IRetryPolicy policy, OperationContext operationContext)
{
this.Cmd = cmd;
this.RetryPolicy = policy != null?policy.CreateInstance() : new NoRetry();
this.OperationContext = operationContext ?? new OperationContext();
#if RT
if (this.OperationContext.StartTime == DateTimeOffset.MinValue)
{
this.OperationContext.StartTime = DateTimeOffset.Now;
}
#else
if (this.OperationContext.StartTime == DateTime.MinValue)
{
this.OperationContext.StartTime = DateTime.Now;
}
#endif
if (!this.OperationContext.OperationExpiryTime.HasValue && cmd != null && cmd.ClientMaxTimeout.HasValue)
{
this.OperationExpiryTime = DateTime.Now + cmd.ClientMaxTimeout.Value;
}
else if (this.OperationContext.OperationExpiryTime.HasValue)
{
// Override timeout for complex actions
#if RT
this.OperationExpiryTime = this.OperationContext.OperationExpiryTime.Value.UtcDateTime;
#else
this.OperationExpiryTime = this.OperationContext.OperationExpiryTime.Value;
#endif
}
}
private async Task <BarionOperationResult> SendWithRetry(BarionOperation operation, CancellationToken cancellationToken)
{
var linkedCts = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken);
SetTimeout(linkedCts);
var shouldRetry = false;
uint currentRetryCount = 0;
TimeSpan retryInterval = TimeSpan.Zero;
BarionOperationResult result = null;
do
{
var message = PrepareHttpRequestMessage(operation);
try
{
var responseMessage = await _httpClient.SendAsync(message, linkedCts.Token);
result = await CreateResultFromResponseMessage(responseMessage, operation);
if (!result.IsOperationSuccessful)
{
shouldRetry = _retryPolicy.CreateInstance().ShouldRetry(currentRetryCount, responseMessage.StatusCode, out retryInterval);
}
}
catch (Exception ex)
{
shouldRetry = _retryPolicy.CreateInstance().ShouldRetry(currentRetryCount, ex, out retryInterval);
if (!shouldRetry)
{
throw;
}
}
if (shouldRetry)
{
await Task.Delay(retryInterval);
currentRetryCount++;
}
} while (shouldRetry && !linkedCts.IsCancellationRequested);
return(result);
}
public ExecutionState(StorageCommandBase <T> cmd, IRetryPolicy policy, OperationContext operationContext)
{
this.Cmd = cmd;
this.RetryPolicy = policy != null?policy.CreateInstance() : new NoRetry();
this.OperationContext = operationContext ?? new OperationContext();
this.InitializeLocation();
if (this.OperationContext.StartTime == DateTime.MinValue)
{
this.OperationContext.StartTime = DateTime.Now;
}
}
public ExecutionState(StorageCommandBase <T> cmd, IRetryPolicy policy, OperationContext operationContext, AsyncCallback callback, object asyncState)
: base(callback, asyncState)
{
this.Cmd = cmd;
this.RetryPolicy = policy != null?policy.CreateInstance() : new NoRetry();
this.OperationContext = operationContext ?? new OperationContext();
if (this.OperationContext.StartTime == DateTime.MinValue)
{
this.OperationContext.StartTime = DateTime.Now;
}
}
public ExecutionState(StorageCommandBase <T> cmd, IRetryPolicy policy, OperationContext operationContext, AsyncCallback callback, object asyncState)
: base(callback, asyncState)
{
this.Cmd = cmd;
this.RetryPolicy = policy.CreateInstance();
this.OperationContext = operationContext ?? new OperationContext();
if (!this.OperationContext.OperationExpiryTime.HasValue && cmd != null && cmd.ClientMaxTimeout.HasValue)
{
this.OperationExpiryTime = DateTime.Now + cmd.ClientMaxTimeout.Value;
}
else if (this.OperationContext.OperationExpiryTime.HasValue)
{
// Override timeout for complex actions
this.OperationExpiryTime = this.OperationContext.OperationExpiryTime.Value;
}
}
/// <summary>
/// Processes an action with this retry policy.
/// </summary>
/// <param name="policy">The retry policy.</param>
/// <param name="action">The async action which will return a result to process.</param>
/// <param name="needThrow">A handler to check if need throw the exception without retry.</param>
/// <param name="cancellationToken">The optional cancellation token.</param>
/// <returns>The processing retry result.</returns>
public static async Task <RetryResult <T> > ProcessAsync <T>(this IRetryPolicy policy, Func <CancellationToken, Task <T> > action, Func <Exception, Exception> needThrow, CancellationToken cancellationToken = default)
{
var result = new RetryResult <T>();
if (action == null)
{
return(result);
}
if (needThrow == null)
{
needThrow = ex => ex;
}
var retry = policy?.CreateInstance() ?? new InternalRetryInstance();
while (true)
{
try
{
cancellationToken.ThrowIfCancellationRequested();
var r = await action(cancellationToken);
result.Success(r);
return(result);
}
catch (Exception ex)
{
result.Fail(ex);
ex = needThrow(ex);
if (ex != null)
{
throw ex;
}
}
var span = retry.Next();
if (!span.HasValue)
{
result.End();
return(result);
}
await Task.Delay(span.Value, cancellationToken);
}
}
public ExecutionState(StorageCommandBase <T> cmd, IRetryPolicy policy, OperationContext operationContext)
{
this.Cmd = cmd;
this.RetryPolicy = policy != null?policy.CreateInstance() : new NoRetry();
this.OperationContext = operationContext ?? new OperationContext();
#if WINDOWS_RT
if (this.OperationContext.StartTime == DateTimeOffset.MinValue)
{
this.OperationContext.StartTime = DateTimeOffset.Now;
}
#else
if (this.OperationContext.StartTime == DateTime.MinValue)
{
this.OperationContext.StartTime = DateTime.Now;
}
#endif
}
public ExecutionState(RESTCommand <T> cmd, IRetryPolicy policy, OperationContext operationContext)
{
Cmd = cmd;
object retryPolicy2;
if (policy == null)
{
IRetryPolicy retryPolicy = new NoRetry();
retryPolicy2 = retryPolicy;
}
else
{
retryPolicy2 = policy.CreateInstance();
}
RetryPolicy = (IRetryPolicy)retryPolicy2;
OperationContext = (operationContext ?? new OperationContext());
InitializeLocation();
if (OperationContext.StartTime == DateTimeOffset.MinValue)
{
OperationContext.StartTime = DateTimeOffset.Now;
}
}
public ExecutionState(StorageCommandBase <T> cmd, IRetryPolicy policy, OperationContext operationContext)
{
this.Cmd = cmd;
this.RetryPolicy = policy != null?policy.CreateInstance() : new NoRetry();
this.OperationContext = operationContext ?? new OperationContext();
#if !(WINDOWS_RT || NETCORE)
this.CancellationTokenSource = new CancellationTokenSource();
#endif
this.InitializeLocation();
#if WINDOWS_RT || NETCORE
if (this.OperationContext.StartTime == DateTimeOffset.MinValue)
{
this.OperationContext.StartTime = DateTimeOffset.Now;
}
#else
if (this.OperationContext.StartTime == DateTime.MinValue)
{
this.OperationContext.StartTime = DateTime.Now;
}
#endif
}
public IRetryPolicy CreateInstance()
{
return(new DontRetryOnNotModifiedPolicy(_innerPolicy.CreateInstance()));
}
/// <summary>
/// Executes the specified operation with retries.
/// </summary>
/// <param name="retryPolicy">The policy that determines the retry logic.</param>
/// <param name="func">The operation to be executed with retries.</param>
/// <param name="actionToExecuteBeforeRetry">The action be executed before each retry attempt.</param>
/// <param name="ignoreNonFatalExceptions">True if non-critical exceptions should be ignored, false otherwise.</param>
/// <returns></returns>
private static bool ExecuteInternal(IRetryPolicy retryPolicy, Func <int, bool> func, Action actionToExecuteBeforeRetry, bool ignoreNonFatalExceptions)
{
if (retryPolicy == null)
{
throw new ArgumentNullException("retryPolicy");
}
if (func == null)
{
throw new ArgumentNullException("func");
}
if (actionToExecuteBeforeRetry == null)
{
throw new ArgumentNullException("actionToExecuteBeforeRetry");
}
// Clone the retry policy to prevent reusing the same instance.
IRetryPolicy internalRetryPolicy = retryPolicy.CreateInstance();
if (internalRetryPolicy == null)
{
throw new InvalidOperationException("The CreateInstance() for the retrypolicy returned null.");
}
int iterationCount = 0;
while (true)
{
try
{
if (func(iterationCount))
{
return(true);
}
if (!internalRetryPolicy.ShouldRetry)
{
return(false);
}
actionToExecuteBeforeRetry();
Thread.Sleep(internalRetryPolicy.WaitTimeBeforeNextRetry);
iterationCount++;
}
catch (Exception ex)
{
// Always re-throw fatal exceptions.
if (ex.IsFatal())
{
throw;
}
// Re-throw non-fatal exceptions if specified by caller.
if (!ignoreNonFatalExceptions)
{
throw;
}
}
}
}
