public static void RepeatUntil(this BackgroundTask task, string expression, DateTimeOffset end)
{
task.Expression = expression;
task.End = end;
}
public static void RepeatIndefinitely(this BackgroundTask task, string expression)
{
task.Expression = expression;
}
private async Task <bool> PerformAsync(BackgroundTask task)
{
var handler = CreateHandler(task);
if (handler == null)
{
task.LastError = ErrorStrings.InvalidHandler;
return(false);
}
var hooks = GetOrCreateMethodHooks(handler);
using var context = ProvisionExecutionContext(_cancel.Token, task.Data);
_pending.TryAdd(handler, hooks);
try
{
// Before:
if (hooks.OnBefore != null)
{
await hooks.OnBefore.BeforeAsync(context);
}
// Handler:
if (context.Continue)
{
await hooks.Handler.PerformAsync(context);
}
// Success:
if (context.Successful && hooks.OnSuccess != null)
{
await hooks.OnSuccess.SuccessAsync(context);
}
// Failure:
if (!context.Successful || task.Attempts >= task.MaximumAttempts)
{
if (hooks.OnFailure != null)
{
await hooks.OnFailure?.FailureAsync(context);
}
}
// After:
if (hooks.OnAfter != null)
{
await hooks.OnAfter?.AfterAsync(context);
}
}
catch (OperationCanceledException)
{
task.LastError = "Cancelled";
}
catch (Exception e)
{
task.LastError = e.Message;
hooks?.OnError?.ErrorAsync(context, e);
}
finally
{
// Error (passed via context):
if (task.LastError != null && hooks?.OnError != null && context.Error != null)
{
task.LastError = context.Error.Message;
hooks.OnError?.ErrorAsync(context, context.Error);
}
_pending.TryRemove(handler, out _);
}
return(context.Successful);
}