81 lines
1.6 KiB
Go
81 lines
1.6 KiB
Go
/*
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Copyright (C) 2013 Aaron Lindsay <aaron@aclindsay.com>
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*/
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package main
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import (
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"asink"
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"sync"
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"time"
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)
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type LongPollGroup struct {
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channels []*chan *asink.Event
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lock sync.Mutex
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}
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type PollingManager struct {
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lock sync.RWMutex
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groups map[int64]*LongPollGroup
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}
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var pm *PollingManager
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func init() {
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pm = new(PollingManager)
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pm.groups = make(map[int64]*LongPollGroup)
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}
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func addPoller(uid int64, channel *chan *asink.Event) {
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pm.lock.RLock()
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group := pm.groups[uid]
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if group != nil {
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group.lock.Lock()
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pm.lock.RUnlock()
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group.channels = append(group.channels, channel)
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group.lock.Unlock()
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} else {
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pm.lock.RUnlock()
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pm.lock.Lock()
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group = new(LongPollGroup)
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group.channels = append(group.channels, channel)
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pm.groups[uid] = group
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pm.lock.Unlock()
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}
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//set timer to call function after one minute
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timeout := time.Duration(1) * time.Minute
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time.AfterFunc(timeout, func() {
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group.lock.Lock()
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for i, c := range group.channels {
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if c == channel {
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copy(group.channels[i:], group.channels[i+1:])
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group.channels = group.channels[:len(group.channels)-1]
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break
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}
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}
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group.lock.Unlock()
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close(*channel)
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})
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}
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func broadcastToPollers(uid int64, event *asink.Event) {
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//store off the long polling group we're trying to send to and remove
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//it from PollingManager.groups
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pm.lock.Lock()
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group := pm.groups[uid]
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pm.groups[uid] = nil
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pm.lock.Unlock()
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//send event down each of group's channels
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if group != nil {
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group.lock.Lock()
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for _, c := range group.channels {
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*c <- event
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}
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group.lock.Unlock()
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}
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}
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