56 lines
1.1 KiB
Go
56 lines
1.1 KiB
Go
package main
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import (
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"errors"
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)
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type Notifier[TNotification any] struct {
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bufferSize int
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Listeners map[string]chan TNotification
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}
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func (n *Notifier[TNotification]) Create(id string) error {
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if _, exists := n.Listeners[id]; exists {
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return errors.New("This listener already exists")
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}
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n.Listeners[id] = make(chan TNotification, n.bufferSize)
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return nil
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}
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// Ensures the listener exists before sending
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func (n *Notifier[TNotification]) SendAndCreate(id string, notification TNotification) error {
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if _, exists := n.Listeners[id]; !exists {
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n.Create(id)
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}
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ch := n.Listeners[id]
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select {
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case ch <- notification:
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return nil
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default:
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return errors.New("Channel is full")
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}
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}
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func (n *Notifier[TNotification]) Delete(id string) error {
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if _, exists := n.Listeners[id]; !exists {
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return errors.New("This listener does not exists")
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}
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delete(n.Listeners, id)
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return nil
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}
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func NewNotifier[TNotification any](bufferSize int) Notifier[TNotification] {
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return Notifier[TNotification]{
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bufferSize: bufferSize,
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Listeners: make(map[string]chan TNotification),
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}
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}
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