public BackgroundDispatcherAsync(
[NotNull] IBackgroundExecution execution,
[NotNull] Func <Guid, object, Task> action,
[CanBeNull] object state,
[NotNull] TaskScheduler taskScheduler,
int maxConcurrency,
bool ownsScheduler)
{
if (maxConcurrency <= 0)
{
throw new ArgumentOutOfRangeException(nameof(maxConcurrency));
}
_execution = execution ?? throw new ArgumentNullException(nameof(execution));
_action = action ?? throw new ArgumentNullException(nameof(action));
_state = state;
_taskScheduler = taskScheduler ?? throw new ArgumentNullException(nameof(taskScheduler));
_ownsScheduler = ownsScheduler;
#if !NETSTANDARD1_3
AppDomainUnloadMonitor.EnsureInitialized();
#endif
_stopped = new CountdownEvent(maxConcurrency);
for (var i = 0; i < maxConcurrency; i++)
{
Task.Factory.StartNew(
DispatchLoop,
CancellationToken.None,
TaskCreationOptions.None,
_taskScheduler).Unwrap();
}
}
public BackgroundExecution(CancellationToken stopToken, [NotNull] BackgroundExecutionOptions options)
{
_options = options ?? throw new ArgumentNullException(nameof(options));
_logger = LogProvider.GetLogger(GetType());
_createdAt = Stopwatch.StartNew();
_stopToken = stopToken;
_stopRegistration = _stopToken.Register(SetStoppedAt);
#if !NETSTANDARD1_3
AppDomainUnloadMonitor.EnsureInitialized();
#endif
}
/// <summary>Initializes a new instance of the <see cref="BackgroundTaskScheduler"/>
/// class with the specified <paramref name="threadFactory"/> and an optional exception
/// handler. All the created threads will be started to dispatch <see cref="Task"/>
/// instances scheduled to run on this scheduler.</summary>
/// <param name="threadFactory">Callback that creates one or more dedicated threads.</param>
/// <param name="exceptionHandler">Optional callback that is invoked when unhandled exception occurs
/// in one of the threads. After this event this instance is considered stopped.</param>
/// <exception cref="ArgumentNullException"><paramref name="threadFactory"/> is <see langword="null"/>.</exception>
/// <exception cref="ArgumentException"><paramref name="threadFactory"/> returned <see langword="null"/> or zero threads.</exception>
/// <exception cref="ArgumentException"><paramref name="threadFactory"/> returned at least one thread not in the <see cref="ThreadState.Unstarted"/> state.</exception>
public BackgroundTaskScheduler(
[NotNull] Func <ThreadStart, IEnumerable <Thread> > threadFactory,
[CanBeNull] Action <Exception> exceptionHandler)
{
if (threadFactory == null)
{
throw new ArgumentNullException(nameof(threadFactory));
}
_exceptionHandler = exceptionHandler;
_semaphore = new Semaphore(0, Int32.MaxValue);
// Stopped event should always be the first in this array, see the DispatchLoop method.
_waitHandles = new WaitHandle[] { _stopped, _semaphore };
#if !NETSTANDARD1_3
AppDomainUnloadMonitor.EnsureInitialized();
#endif
_threads = threadFactory(DispatchLoop)?.ToArray();
if (_threads == null || _threads.Length == 0)
{
throw new ArgumentException("At least one non-started thread should be created.", nameof(threadFactory));
}
if (_threads.Any(thread => thread == null || (thread.ThreadState & ThreadState.Unstarted) == 0))
{
throw new ArgumentException("All the threads should be non-null and in the ThreadState.Unstarted state.", nameof(threadFactory));
}
foreach (var thread in _threads)
{
thread.Start();
}
_ourThreadIds = new HashSet <int>(_threads.Select(x => x.ManagedThreadId));
}
public BackgroundDispatcher(
[NotNull] IBackgroundExecution execution,
[NotNull] Action <Guid, object> action,
[CanBeNull] object state,
[NotNull] Func <ThreadStart, IEnumerable <Thread> > threadFactory)
{
if (threadFactory == null)
{
throw new ArgumentNullException(nameof(threadFactory));
}
_execution = execution ?? throw new ArgumentNullException(nameof(execution));
_action = action ?? throw new ArgumentNullException(nameof(action));
_state = state;
#if !NETSTANDARD1_3
AppDomainUnloadMonitor.EnsureInitialized();
#endif
var threads = threadFactory(DispatchLoop)?.ToArray();
if (threads == null || threads.Length == 0)
{
throw new ArgumentException("At least one unstarted thread should be created.", nameof(threadFactory));
}
if (threads.Any(thread => thread == null || (thread.ThreadState & ThreadState.Unstarted) == 0))
{
throw new ArgumentException("All the threads should be non-null and in the ThreadState.Unstarted state.", nameof(threadFactory));
}
_stopped = new CountdownEvent(threads.Length);
foreach (var thread in threads)
{
thread.Start();
}
}
