private void _BackgroundWorkerRunWorkerCompleted(
object sender,
RunWorkerCompletedEventArgs e)
{
BackgroundWorker bw = sender as BackgroundWorker;
try
{
AsyncSolveContext ctx = null;
if (_workers.TryGetValue(bw, out ctx))
{
_HandleWorkerCompleted(e, ctx);
}
else
{
// normally haveWorker = false only if operation was cancelled
Debug.Assert(e.Cancelled);
}
}
finally
{
bw.Dispose(); // actually does nothing
_workers.Remove(bw);
}
}
private void _HandleWorkerCompleted(
RunWorkerCompletedEventArgs e,
AsyncSolveContext ctx)
{
Guid id = ctx.OperationID;
// NOTE: don't need to handle Cancelled status here, we raise SolveCompleted
// event immediately after setting worker to cancellation state
if (e.Cancelled)
{
return;
}
if (e.Error != null)
{
// operation failed
_NotifyAsyncSolveCompleted(e.Error, false, id);
return;
}
var operation = ctx.Task;
var resultProvider = (Func <SolveTaskResult>)e.Result;
bool isConverted = false;
Exception error = null;
var result = _ConvertResult(resultProvider, out error);
if (result != null)
{
// check if we need to run next task.
var nextTask = result.NextTask;
if (nextTask != null)
{
// run next task with the same operation id.
isConverted = _TryRunAsync(nextTask, id, out error);
}
else
{
// converted successfully, provide the result
_NotifyAsyncSolveCompleted(null, false, id, result.SolveResult);
isConverted = true;
}
}
if (!isConverted)
{
// conversion failed, set error
_NotifyAsyncSolveCompleted(error, false, id);
}
}
private void _RunAsync(IAsyncSolveTask task, Guid operationID)
{
Debug.Assert(task != null);
var context = new AsyncSolveContext
{
Task = task,
OperationID = operationID,
};
var worker = new BackgroundWorker();
worker.WorkerSupportsCancellation = true;
worker.DoWork += _BackgroundWorkerDoWork;
worker.RunWorkerCompleted += _BackgroundWorkerRunWorkerCompleted;
_workers.Add(worker, context);
worker.RunWorkerAsync(task);
}
private void _RunAsync(IAsyncSolveTask task, Guid operationID)
{
Debug.Assert(task != null);
var context = new AsyncSolveContext
{
Task = task,
OperationID = operationID,
};
var worker = new BackgroundWorker();
worker.WorkerSupportsCancellation = true;
worker.DoWork += _BackgroundWorkerDoWork;
worker.RunWorkerCompleted += _BackgroundWorkerRunWorkerCompleted;
_workers.Add(worker, context);
worker.RunWorkerAsync(task);
}
private void _HandleWorkerCompleted(
RunWorkerCompletedEventArgs e,
AsyncSolveContext ctx)
{
Guid id = ctx.OperationID;
// NOTE: don't need to handle Cancelled status here, we raise SolveCompleted
// event immediately after setting worker to cancellation state
if (e.Cancelled)
{
return;
}
if (e.Error != null)
{
// operation failed
_NotifyAsyncSolveCompleted(e.Error, false, id);
return;
}
var operation = ctx.Task;
var resultProvider = (Func<SolveTaskResult>)e.Result;
bool isConverted = false;
Exception error = null;
var result = _ConvertResult(resultProvider, out error);
if (result != null)
{
// check if we need to run next task.
var nextTask = result.NextTask;
if (nextTask != null)
{
// run next task with the same operation id.
isConverted = _TryRunAsync(nextTask, id, out error);
}
else
{
// converted successfully, provide the result
_NotifyAsyncSolveCompleted(null, false, id, result.SolveResult);
isConverted = true;
}
}
if (!isConverted)
{
// conversion failed, set error
_NotifyAsyncSolveCompleted(error, false, id);
}
}