| Safe Haskell | Safe |
|---|---|
| Language | Haskell2010 |
Network.HTTP2.Priority
Description
This is partial implementation of the priority of HTTP/2.
This implementation does support structured priority queue but not support re-structuring. This means that it is assumed that an entry created by a Priority frame is never closed. The entry behaves an intermediate node, not a leaf.
This queue is fair for weight. Consider two weights: 201 and 101. Repeating enqueue/dequeue probably produces 201, 201, 101, 201, 201, 101, ...
Only one entry per stream should be enqueued.
- data Precedence
- defaultPrecedence :: Precedence
- toPrecedence :: Priority -> Precedence
- data PriorityTree a
- newPriorityTree :: IO (PriorityTree a)
- prepare :: PriorityTree a -> StreamId -> Priority -> IO ()
- enqueue :: PriorityTree a -> StreamId -> Precedence -> a -> IO ()
- dequeue :: PriorityTree a -> IO (StreamId, Precedence, a)
- dequeueSTM :: PriorityTree a -> STM (StreamId, Precedence, a)
- isEmpty :: PriorityTree a -> IO Bool
- isEmptySTM :: PriorityTree a -> STM Bool
- delete :: PriorityTree a -> StreamId -> Precedence -> IO (Maybe a)
Precedence
data Precedence Source #
Internal representation of priority in priority queues.
The precedence of a dequeued entry should be specified
to enqueue when the entry is enqueued again.
Instances
defaultPrecedence :: Precedence Source #
Default precedence.
toPrecedence :: Priority -> Precedence Source #
Converting Priority to Precedence.
When an entry is enqueued at the first time,
this function should be used.
PriorityTree
data PriorityTree a Source #
Abstract data type for priority trees.
newPriorityTree :: IO (PriorityTree a) Source #
Creating a new priority tree.
PriorityTree functions
prepare :: PriorityTree a -> StreamId -> Priority -> IO () Source #
Bringing up the structure of the priority tree. This must be used for Priority frame.
enqueue :: PriorityTree a -> StreamId -> Precedence -> a -> IO () Source #
Enqueuing an entry to the priority tree. This must be used for Header frame.
dequeue :: PriorityTree a -> IO (StreamId, Precedence, a) Source #
Dequeuing an entry from the priority tree.
dequeueSTM :: PriorityTree a -> STM (StreamId, Precedence, a) Source #
Dequeuing an entry from the priority tree.
isEmptySTM :: PriorityTree a -> STM Bool Source #
Checking if the priority tree is empty.