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poller.go
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poller.go
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// Copyright (c) 2014-2018 Bitmark Inc.
// Use of this source code is governed by an ISC
// license that can be found in the LICENSE file.
package zmqutil
import (
zmq "github.com/pebbe/zmq4"
"sync"
"time"
)
// structure to hold a poller
type Poller struct {
sync.Mutex
sockets map[*zmq.Socket]zmq.State
poller *zmq.Poller
}
// create a poller
// this is just to encapsulate the zmq poller to allow removal of a socket from a socket
func NewPoller() *Poller {
return &Poller{
sockets: make(map[*zmq.Socket]zmq.State),
poller: zmq.NewPoller(),
}
}
// add a socket to a poller
func (poller *Poller) Add(socket *zmq.Socket, events zmq.State) {
poller.Lock()
defer poller.Unlock()
// protect against duplicate add
if _, ok := poller.sockets[socket]; ok {
return
}
// preserve the event mask
poller.sockets[socket] = events
// add to the internal poller
poller.poller.Add(socket, events)
}
// remove a socket from a poller
func (poller *Poller) Remove(socket *zmq.Socket) {
poller.Lock()
defer poller.Unlock()
// protect against duplicate remove
if _, ok := poller.sockets[socket]; !ok {
return
}
// remove the socket
delete(poller.sockets, socket)
poller.poller.RemoveBySocket(socket)
}
// perform a poll
func (poller *Poller) Poll(timeout time.Duration) ([]zmq.Polled, error) {
poller.Lock()
p := poller.poller
poller.Unlock()
polled, err := p.Poll(timeout)
return polled, err
}