-
Notifications
You must be signed in to change notification settings - Fork 196
/
publisher.go
61 lines (51 loc) · 1.73 KB
/
publisher.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
// Copyright (c) 2014 - The Event Horizon authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package local
import (
"context"
"sync"
eh "github.com/looplab/eventhorizon"
)
var _ = eh.EventPublisher(&EventPublisher{})
// EventPublisher is an event publisher that notifies registered EventHandlers
// of published events. It will use the SimpleEventHandlingStrategy by default.
type EventPublisher struct {
observers map[eh.EventObserver]bool
observersMu sync.RWMutex
}
// NewEventPublisher creates a EventPublisher.
func NewEventPublisher() *EventPublisher {
b := &EventPublisher{
observers: make(map[eh.EventObserver]bool),
}
return b
}
// HandleEvent implements the HandleEvent method of the eventhorizon.EventPublisher
// interface.
func (b *EventPublisher) HandleEvent(ctx context.Context, event eh.Event) error {
b.observersMu.RLock()
defer b.observersMu.RUnlock()
// Notify all observers about the event.
for o := range b.observers {
o.Notify(ctx, event)
}
return nil
}
// AddObserver implements the AddObserver method of the eventhorizon.EventPublisher
// interface.
func (b *EventPublisher) AddObserver(observer eh.EventObserver) {
b.observersMu.Lock()
defer b.observersMu.Unlock()
b.observers[observer] = true
}