Added a mutex for Listeners struct for thread safety.
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5a058aa706
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@ -4,10 +4,12 @@ import (
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"errors"
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"fmt"
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"math"
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"sync"
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)
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// Listeners stores the current and peak numbers of listeners.
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type Listeners struct {
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mut sync.Mutex
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current, peak int
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}
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@ -18,16 +20,22 @@ func NewListeners() *Listeners {
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// Current returns a number of current listeners.
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func (l *Listeners) Current() int {
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l.mut.Lock()
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defer l.mut.Unlock()
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return l.current
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}
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// Current returns a number of peak listeners.
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func (l *Listeners) Peak() int {
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l.mut.Lock()
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defer l.mut.Unlock()
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return l.peak
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}
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// Inc increments by 1 a current number of listeners and updates a peak number.
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func (l *Listeners) Inc() int {
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l.mut.Lock()
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defer l.mut.Unlock()
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if l.current == math.MaxInt {
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// We panic here because if this will ever happen, then something's going certainly wrong.
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panic(fmt.Sprint("a current number of listeners exceeded MaxInt which is", math.MaxInt))
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@ -42,6 +50,8 @@ func (l *Listeners) Inc() int {
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// Dec decrements by 1 a current number of listeners. An error will occur if
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// a resulting number is less than 0.
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func (l *Listeners) Dec() (int, error) {
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l.mut.Lock()
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defer l.mut.Unlock()
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if l.current == 0 {
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return l.current, errors.New("an attempt to decrement a number of current listeners down to less than 0")
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}
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