public async Task Target_TestMaxMessages()
{
var outputs = new List <int>();
var tenTimesTransformer = new TransformBlock <int, int>(
x => x * 10,
new ExecutionDataflowBlockOptions()
{
BoundedCapacity = 1
});
var target = tenTimesTransformer
.ChainToTarget(new ActionBlock <int>(
async i =>
{
outputs.Add(i);
await Task.Delay(100); // Delay to postpone offer
},
new ExecutionDataflowBlockOptions()
{
BoundedCapacity = 1
}
));
// sourceBlock emits 1, 2, 3, 4, 5
var sourceBlock = new BufferBlock <int>();
for (var i = 1; i <= 5; i++)
{
sourceBlock.Post(i);
}
sourceBlock.LinkTo(target, new DataflowLinkOptions()
{
MaxMessages = 2
});
await Task.Delay(500);
// Expect first 2 items
outputs.Is(10, 20);
}
