/// <summary>
/// Reads input and applies the method to each input, and emits the output
/// </summary>
/// <param name="method">The worker method to apply to each element.</param>
/// <typeparam name="TInput">The input type parameter.</typeparam>
/// <typeparam name="TOutput">The output type parameter.</typeparam>
private static Task Worker <TInput, TOutput>(Func <TInput, TOutput> method)
{
return(AutomationExtensions.RunTask(
new {
input = ChannelMarker.ForRead <TInput>(WORKERINPUT),
output = ChannelMarker.ForWrite <TOutput>(WORKEROUTPUT)
},
async self => {
try
{
while (true)
{
await self.output.WriteAsync(method(await self.input.ReadAsync().ConfigureAwait(false))).ConfigureAwait(false);
}
}
catch (Exception ex)
{
if (!(ex is RetiredException))
{
Console.WriteLine("ex: {0}", ex);
}
throw;
}
}
));
}
public void TestRetireWithoutLoss()
{
Task[] tasks;
int count = 0;
using (new ChannelScope())
{
tasks = new Task[] {
AutomationExtensions.RunTask(
new { channel = ChannelMarker.ForWrite <int>(CHANNEL_NAME) },
async self =>
{
await Task.Delay(500);
await self.channel.WriteAsync(1);
}
),
AutomationExtensions.RunTask(
new { channel = ChannelMarker.ForWrite <int>(CHANNEL_NAME) },
async self =>
{
await Task.Delay(1000);
await self.channel.WriteAsync(1);
}
),
AutomationExtensions.RunTask(
new { channel = ChannelMarker.ForRead <int>(CHANNEL_NAME) },
async self =>
{
while (true)
{
await self.channel.ReadAsync();
count++;
}
}
)
};
}
var all = Task.WhenAll(tasks).WaitForTask();
if (count != 2)
{
throw new Exception(string.Format("Unexpected count, expected {0} but got {1}", 2, count));
}
if (all.IsFaulted || !all.IsCompleted)
{
throw new Exception("Unexpected task state");
}
}
/// <summary>
/// Emits all values from the enumerable into the network
/// </summary>
/// <param name="values">Values.</param>
/// <typeparam name="TInput">The 1st type parameter.</typeparam>
private static Task Generator <TInput>(IEnumerable <TInput> values)
{
return(AutomationExtensions.RunTask(
new { channel = ChannelMarker.ForWrite <TInput>(WORKERINPUT) },
async self => {
foreach (var value in values)
{
await self.channel.WriteAsync(value).ConfigureAwait(false);
}
}
));
}
private void TestReaderOverflow(QueueOverflowStrategy strategy)
{
using (new IsolatedChannelScope())
{
var readertasks = Enumerable.Range(0, 4).Select(count =>
AutomationExtensions.RunTask(new {
Input = ChannelMarker.ForRead <int>("channel", maxPendingReaders: 3, pendingReadersOverflowStrategy: strategy)
},
async x =>
{
//Console.WriteLine("Started {0}", count);
while (true)
{
await x.Input.ReadAsync();
}
})
).ToList();
using (ChannelManager.GetChannel <int>("channel").AsWriteOnly())
Task.Delay(500).WaitForTaskOrThrow();
Task.WhenAny(readertasks.Union(new [] { Task.Delay(1000) })).WaitForTaskOrThrow();
Task.Delay(500).WaitForTaskOrThrow();
int discard;
switch (strategy)
{
case QueueOverflowStrategy.FIFO:
discard = 0;
break;
case QueueOverflowStrategy.LIFO:
discard = readertasks.Count - 2;
break;
case QueueOverflowStrategy.Reject:
default:
discard = readertasks.Count - 1;
break;
}
Assert.IsTrue(readertasks[discard].IsFaulted);
TestAssert.IsInstanceOf <ChannelOverflowException>(readertasks[discard].Exception.Flatten().InnerExceptions.First());
readertasks.RemoveAt(discard);
Assert.IsTrue(readertasks.All(x => x.IsCompleted && !x.IsFaulted && !x.IsCanceled));
}
}
/// <summary>
/// Collects input and combines it with the join method
/// </summary>
/// <param name="joinmethod">The method used to join results.</param>
/// <param name="initial">The initial input to the join method, aka. the neutral element.</param>
/// <typeparam name="TOutput">The type parameter for the data to join.</typeparam>
/// <typeparam name="TResult">The type parameter for the aggregated data.</typeparam>
private static async Task <TResult> Collector <TOutput, TResult>(Func <TResult, TOutput, TResult> joinmethod, TResult initial)
{
var current = initial;
await AutomationExtensions.RunTask(
new { channel = ChannelMarker.ForRead <TOutput>(WORKEROUTPUT) },
async self => {
while (true)
{
current = joinmethod(current, await self.channel.ReadAsync().ConfigureAwait(false));
}
}
).ConfigureAwait(false);
return(current);
}
public void TestScope()
{
var values = new[] { 0, 1, 2, 3, 4 };
var counter = new CounterShim();
var readercount = 10;
var name = "bcast";
using (new IsolatedChannelScope())
{
var writer = AutomationExtensions.RunTask(
new { chan = ChannelMarker.ForWrite <int>(name, broadcast: true, initialBroadcastBarrier: readercount) },
async self =>
{
foreach (var v in values)
{
await self.chan.WriteAsync(v);
}
}
);
var readers = Enumerable.Range(0, readercount).Select(x => AutomationExtensions.RunTask(
new { chan = ChannelMarker.ForRead <int>(name) },
async self =>
{
foreach (var v in values)
{
var r = await self.chan.ReadAsync();
counter.Increment();
if (Comparer <int> .Default.Compare(v, r) != 0)
{
throw new Exception(string.Format("Got {0} but expected {1}", r, v));
}
}
}
)).ToArray();
Task.WhenAll(readers.Union(new[] { writer })).WaitForTaskOrThrow();
if (counter.Count != readercount * values.Length)
{
throw new Exception(string.Format("The counter said {0} values were read, but {1} was expected", counter.Count, readercount * values.Length));
}
}
}
private void TestCappedPool(int poolsize, int readers, int writes)
{
var concurrent = 0;
var max_concurrent = 0;
var rnd = new Random();
var earlyRetire = new TaskCompletionSource <bool>();
using (new IsolatedChannelScope())
using (new ExecutionScope(poolsize <= 0 ? ThreadPool.DEFAULT_THREADPOOL : new CappedThreadedThreadPool(poolsize)))
{
var readertasks = Task.WhenAll(Enumerable.Range(0, readers).Select(count =>
AutomationExtensions.RunTask(new {
Input = ChannelMarker.ForRead <int>("channel")
},
async x =>
{
//Console.WriteLine("Started {0}", count);
while (true)
{
await x.Input.ReadAsync();
var cur = System.Threading.Interlocked.Increment(ref concurrent);
//Console.WriteLine("Active {0}", count);
// Dirty access to "concurrent" and "max_concurrent" variables
max_concurrent = Math.Max(cur, Math.Max(max_concurrent, concurrent));
if (cur > poolsize && poolsize > 0)
{
Console.WriteLine("Found {0} concurrent threads", cur);
earlyRetire.TrySetException(new Exception(string.Format("Found {0} concurrent threads", cur)));
throw new Exception(string.Format("Found {0} concurrent threads", cur));
}
// By blocking the actual thread, we provoke the threadpool to start multiple threads
System.Threading.Thread.Sleep(rnd.Next(10, 500));
// Dirty access to "concurrent" and "max_concurrent" variables
max_concurrent = Math.Max(cur, Math.Max(max_concurrent, concurrent));
System.Threading.Interlocked.Decrement(ref concurrent);
//Console.WriteLine("Inactive {0}", count);
}
})
));
var writetask = AutomationExtensions.RunTask(new {
Output = ChannelMarker.ForWrite <int>("channel")
},
async x => {
foreach (var i in Enumerable.Range(0, writes))
{
//Console.WriteLine("Writing {0}", i);
await x.Output.WriteAsync(i);
}
});
var timeout = Task.Delay((writes * 500) + 5000);
if (Task.WhenAny(Task.WhenAll(readertasks, writetask), timeout, earlyRetire.Task).WaitForTaskOrThrow() == timeout)
{
throw new TimeoutException("I've waited for so long ....");
}
Console.WriteLine("Threads at shutdown: {0}", concurrent);
ExecutionScope.Current.EnsureFinishedAsync(TimeSpan.FromSeconds(5)).WaitForTaskOrThrow();
Console.WriteLine("Max concurrent threads: {0}, should be {1}", max_concurrent, poolsize <= 0 ? "unlimited" : poolsize.ToString());
}
}