public async Task HandleableCollectionThrowsWhenDisposedTest()
{
var collection = new HandleableCollection <int>();
AddRangeAndVerifyItems(collection, endInclusive: 9);
HandleableCollection <int> .Handler handler = (int item, out bool removeItem) =>
{
removeItem = false;
return(20 == item);
};
using var cancellation = new CancellationTokenSource(DefaultPositiveVerificationTimeout);
Task handleTask = Task.Run(() => collection.Handle(handler, DefaultPositiveVerificationTimeout));
Task handleAsyncTask = collection.HandleAsync(handler, cancellation.Token);
// Task.Delay intentionally shorter than default timeout to check that Handle*
// calls did not complete quickly.
Task delayTask = Task.Delay(TimeSpan.FromSeconds(1));
Task completedTask = await Task.WhenAny(delayTask, handleTask, handleAsyncTask);
// Check that the handle tasks didn't complete
Assert.Equal(delayTask, completedTask);
collection.Dispose();
// Incomplete calls from prior to disposal should throw ObjectDisposedException
await Assert.ThrowsAsync <ObjectDisposedException>(() => handleTask);
await Assert.ThrowsAsync <ObjectDisposedException>(() => handleAsyncTask);
// New calls should throw ObjectDisposedException
Assert.Throws <ObjectDisposedException>(
() => collection.Add(10));
Assert.Throws <ObjectDisposedException>(
() => collection.ClearItems());
Assert.Throws <ObjectDisposedException>(
() => collection.Handle(DefaultPositiveVerificationTimeout));
Assert.Throws <ObjectDisposedException>(
() => collection.Handle(handler, DefaultPositiveVerificationTimeout));
await Assert.ThrowsAsync <ObjectDisposedException>(
() => collection.HandleAsync(cancellation.Token));
await Assert.ThrowsAsync <ObjectDisposedException>(
() => collection.HandleAsync(handler, cancellation.Token));
Assert.Throws <ObjectDisposedException>(
() => ((IEnumerable)collection).GetEnumerator());
Assert.Throws <ObjectDisposedException>(
() => ((IEnumerable <int>)collection).GetEnumerator());
}
/// <summary>
/// Listens at the address for new connections.
/// </summary>
/// <param name="maxConnections">The maximum number of connections the server will support.</param>
/// <param name="token">The token to monitor for cancellation requests.</param>
/// <returns>A task that completes when the server is no longer listening at the address.</returns>
private async Task ListenAsync(int maxConnections, CancellationToken token)
{
// This disposal shuts down the transport in case an exception is thrown.
using var transport = IpcServerTransport.Create(_address, maxConnections, _enableTcpIpProtocol, TransportCallback);
// This disposal shuts down the transport in case of cancellation; causes the transport
// to not recreate the server stream before the AcceptAsync call observes the cancellation.
using var _ = token.Register(() => transport.Dispose());
while (!token.IsCancellationRequested)
{
Stream stream = null;
IpcAdvertise advertise = null;
try
{
stream = await transport.AcceptAsync(token).ConfigureAwait(false);
}
catch (OperationCanceledException)
{
}
catch (Exception)
{
// The advertise data could be incomplete if the runtime shuts down before completely writing
// the information. Catch the exception and continue waiting for a new connection.
}
if (null != stream)
{
// Cancel parsing of advertise data after timeout period to
// mitigate runtimes that write partial data and do not close the stream (avoid waiting forever).
using var parseCancellationSource = new CancellationTokenSource();
using var linkedSource = CancellationTokenSource.CreateLinkedTokenSource(token, parseCancellationSource.Token);
try
{
parseCancellationSource.CancelAfter(ParseAdvertiseTimeout);
advertise = await IpcAdvertise.ParseAsync(stream, linkedSource.Token).ConfigureAwait(false);
}
catch (Exception)
{
stream.Dispose();
}
}
if (null != advertise)
{
Guid runtimeCookie = advertise.RuntimeInstanceCookie;
int pid = unchecked ((int)advertise.ProcessId);
// The valueFactory parameter of the GetOrAdd overload that uses Func<TKey, TValue> valueFactory
// does not execute the factory under a lock thus it is not thread-safe. Create the collection and
// use a thread-safe version of GetOrAdd; use equality comparison on the result to determine if
// the new collection was added to the dictionary or if an existing one was returned.
var newStreamCollection = new HandleableCollection <Stream>();
var streamCollection = _streamCollections.GetOrAdd(runtimeCookie, newStreamCollection);
try
{
streamCollection.ClearItems();
streamCollection.Add(stream);
if (newStreamCollection == streamCollection)
{
ServerIpcEndpoint endpoint = new ServerIpcEndpoint(this, runtimeCookie);
_endpointInfos.Add(new IpcEndpointInfo(endpoint, pid, runtimeCookie));
}
else
{
newStreamCollection.Dispose();
}
}
catch (ObjectDisposedException)
{
// The stream collection could be disposed by RemoveConnection which would cause an
// ObjectDisposedException to be thrown if trying to clear/add the stream.
stream.Dispose();
}
}
}
}