/// <summary>
/// Raises events for changes in execution state.
/// </summary>
protected void RaisePipelineStateEvents()
{
Queue <ExecutionEventQueueItem> tempEventQueue = null;
EventHandler <PipelineStateEventArgs> stateChanged = null;
bool runspaceHasAvailabilityChangedSubscribers = false;
lock (SyncRoot)
{
stateChanged = this.StateChanged;
runspaceHasAvailabilityChangedSubscribers = _runspace.HasAvailabilityChangedSubscribers;
if (stateChanged != null || runspaceHasAvailabilityChangedSubscribers)
{
tempEventQueue = _executionEventQueue;
_executionEventQueue = new Queue <ExecutionEventQueueItem>();
}
else
{
//Clear the events if there are no EventHandlers. This
//ensures that events do not get called for state
//changes prior to their registration.
_executionEventQueue.Clear();
}
}
if (tempEventQueue != null)
{
while (tempEventQueue.Count > 0)
{
ExecutionEventQueueItem queueItem = tempEventQueue.Dequeue();
if (runspaceHasAvailabilityChangedSubscribers && queueItem.NewRunspaceAvailability != queueItem.CurrentRunspaceAvailability)
{
_runspace.RaiseAvailabilityChangedEvent(queueItem.NewRunspaceAvailability);
}
// this is shipped as part of V1. So disabling the warning here.
#pragma warning disable 56500
//Exception rasied in the eventhandler are not error in pipeline.
//silently ignore them.
if (stateChanged != null)
{
try
{
stateChanged(this, new PipelineStateEventArgs(queueItem.PipelineStateInfo));
}
catch (Exception exception) // ignore non-severe exceptions
{
CommandProcessorBase.CheckForSevereException(exception);
}
}
#pragma warning restore 56500
}
}
}