50 lines
1.1 KiB
Go
50 lines
1.1 KiB
Go
package util
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import (
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"reflect"
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"sync"
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)
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// TeeAttacher allows attaching a listener to a tee
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type TeeAttacher interface {
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Attach() <-chan Param
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}
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// Tee distributes parameters to subscribers
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type Tee struct {
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mu sync.Mutex
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recv []chan<- Param
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}
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// Attach creates a new receiver channel and attaches it to the tee
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func (t *Tee) Attach() <-chan Param {
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// TODO find better approach to prevent deadlocks
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// this will buffer the receiver channel to prevent deadlocks when consumers use mutex-protected loadpoint api
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out := make(chan Param, 16)
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t.add(out)
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return out
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}
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// add attaches a receiver channel to the tee
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func (t *Tee) add(out chan<- Param) {
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t.mu.Lock()
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defer t.mu.Unlock()
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t.recv = append(t.recv, out)
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}
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// Run starts parameter distribution
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func (t *Tee) Run(in <-chan Param) {
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for msg := range in {
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if val := reflect.ValueOf(msg.Val); val.Kind() == reflect.Ptr {
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if ptr := reflect.Indirect(val); ptr.IsValid() {
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msg.Val = ptr.Addr().Elem().Interface()
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}
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}
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t.mu.Lock()
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for _, recv := range t.recv {
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recv <- msg
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}
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t.mu.Unlock()
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}
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}
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