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59 lines
1.5 KiB
59 lines
1.5 KiB
package p2p
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import "sync"
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// queue does QoS scheduling for Envelopes, enqueueing and dequeueing according
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// to some policy. Queues are used at contention points, i.e.:
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//
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// - Receiving inbound messages to a single channel from all peers.
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// - Sending outbound messages to a single peer from all channels.
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type queue interface {
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// enqueue returns a channel for submitting envelopes.
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enqueue() chan<- Envelope
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// dequeue returns a channel ordered according to some queueing policy.
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dequeue() <-chan Envelope
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// close closes the queue. After this call enqueue() will block, so the
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// caller must select on closed() as well to avoid blocking forever. The
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// enqueue() and dequeue() channels will not be closed.
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close()
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// closed returns a channel that's closed when the scheduler is closed.
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closed() <-chan struct{}
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}
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// fifoQueue is a simple unbuffered lossless queue that passes messages through
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// in the order they were received, and blocks until message is received.
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type fifoQueue struct {
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queueCh chan Envelope
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closeCh chan struct{}
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closeOnce sync.Once
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}
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var _ queue = (*fifoQueue)(nil)
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func newFIFOQueue() *fifoQueue {
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return &fifoQueue{
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queueCh: make(chan Envelope),
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closeCh: make(chan struct{}),
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}
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}
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func (q *fifoQueue) enqueue() chan<- Envelope {
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return q.queueCh
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}
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func (q *fifoQueue) dequeue() <-chan Envelope {
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return q.queueCh
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}
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func (q *fifoQueue) close() {
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q.closeOnce.Do(func() {
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close(q.closeCh)
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})
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}
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func (q *fifoQueue) closed() <-chan struct{} {
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return q.closeCh
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}
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