// blocking
public ItemOfInterest GetItem(ProblemType problemType)
{
bool lockTaken = false;
Monitor.Enter(_blackboard, ref lockTaken);
ItemOfInterest item = null;
try
{
item = _blackboard.Items.FirstOrDefault(it => it.ProblemType == problemType && it.State != ItemState.Processing);
if (item != null)
{
item.State = ItemState.Processing;
}
}
finally
{
if (lockTaken)
{
Monitor.Exit(_blackboard);
}
}
return(item);
}
public void Process(ItemOfInterest item)
{
if (item.ProblemType == ProblemType.Philosophical)
{
item.ProblemType = ProblemType.Solved;
}
item.State = ItemState.Processed;
Console.WriteLine("Philosopher processed item " + item.Name);
}
public void Process(ItemOfInterest item)
{
if (item.ProblemType == ProblemType.Scientific)
{
item.ProblemType = ProblemType.Economical;
}
item.State = ItemState.Processed;
Console.WriteLine("Scientist processed item " + item.Name);
}