/// <summary>
/// Returned tasks completes once channel state has become different from
/// given lastObservedState.
/// If deadline is reached or and error occurs, returned task is cancelled.
/// </summary>
public Task WaitForStateChangedAsync(ChannelState lastObservedState, DateTime?deadline = null)
{
GrpcPreconditions.CheckArgument(lastObservedState != ChannelState.Shutdown,
"Shutdown is a terminal state. No further state changes can occur.");
var tcs = new TaskCompletionSource <object>();
var deadlineTimespec = deadline.HasValue ? Timespec.FromDateTime(deadline.Value) : Timespec.InfFuture;
// pass "tcs" as "state" for WatchConnectivityStateHandler.
handle.WatchConnectivityState(lastObservedState, deadlineTimespec, completionQueue, WatchConnectivityStateHandler, tcs);
return(tcs.Task);
}
/// <summary>
/// Returned tasks completes once channel state has become different from
/// given lastObservedState.
/// If deadline is reached or and error occurs, returned task is cancelled.
/// </summary>
public IObservable <bool> WaitForStateChangedAsync(ChannelState lastObservedState, DateTime?deadline = null)
{
GrpcPreconditions.CheckArgument(lastObservedState != ChannelState.Shutdown,
"Shutdown is a terminal state. No further state changes can occur.");
var subject = new AsyncSubject <bool>();
var deadlineTimespec = deadline.HasValue ? Timespec.FromDateTime(deadline.Value) : Timespec.InfFuture;
var handler = new BatchCompletionDelegate((success, ctx) =>
{
subject.OnNext(success);
subject.OnCompleted();
});
handle.WatchConnectivityState(lastObservedState, deadlineTimespec, completionQueue, handler);
return(subject);
}
/// <summary>
/// Returned tasks completes once channel state has become different from
/// given lastObservedState.
/// If deadline is reached or and error occurs, returned task is cancelled.
/// </summary>
public Task WaitForStateChangedAsync(ChannelState lastObservedState, DateTime?deadline = null)
{
Preconditions.CheckArgument(lastObservedState != ChannelState.FatalFailure,
"FatalFailure is a terminal state. No further state changes can occur.");
var tcs = new TaskCompletionSource <object>();
var deadlineTimespec = deadline.HasValue ? Timespec.FromDateTime(deadline.Value) : Timespec.InfFuture;
var handler = new BatchCompletionDelegate((success, ctx) =>
{
if (success)
{
tcs.SetResult(null);
}
else
{
tcs.SetCanceled();
}
});
handle.WatchConnectivityState(lastObservedState, deadlineTimespec, environment.CompletionQueue, environment.CompletionRegistry, handler);
return(tcs.Task);
}
/// <summary>
/// Returned tasks completes once channel state has become different from
/// given lastObservedState (<c>true</c> is returned) or if the wait has timed out (<c>false</c> is returned).
/// </summary>
public Task <bool> TryWaitForStateChangedAsync(ChannelState lastObservedState, DateTime?deadline = null)
{
GrpcPreconditions.CheckArgument(lastObservedState != ChannelState.Shutdown,
"Shutdown is a terminal state. No further state changes can occur.");
var tcs = new TaskCompletionSource <bool>();
var deadlineTimespec = deadline.HasValue ? Timespec.FromDateTime(deadline.Value) : Timespec.InfFuture;
lock (myLock)
{
if (handle.IsClosed)
{
// If channel has been already shutdown and handle was disposed, we would end up with
// an abandoned completion added to the completion registry. Instead, we make sure we fail early.
throw new ObjectDisposedException(nameof(handle), "Channel handle has already been disposed.");
}
else
{
// pass "tcs" as "state" for WatchConnectivityStateHandler.
handle.WatchConnectivityState(lastObservedState, deadlineTimespec, completionQueue, WatchConnectivityStateHandler, tcs);
}
}
return(tcs.Task);
}