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
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
|
// Copyright 2014 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// go-ethereum is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
package filter
import "reflect"
type Filter interface {
Compare(Filter) bool
Trigger(data interface{})
}
type FilterEvent struct {
filter Filter
data interface{}
}
type Filters struct {
id int
watchers map[int]Filter
ch chan FilterEvent
quit chan struct{}
}
func New() *Filters {
return &Filters{
ch: make(chan FilterEvent),
watchers: make(map[int]Filter),
quit: make(chan struct{}),
}
}
func (self *Filters) Start() {
go self.loop()
}
func (self *Filters) Stop() {
close(self.quit)
}
func (self *Filters) Notify(filter Filter, data interface{}) {
self.ch <- FilterEvent{filter, data}
}
func (self *Filters) Install(watcher Filter) int {
self.watchers[self.id] = watcher
self.id++
return self.id - 1
}
func (self *Filters) Uninstall(id int) {
delete(self.watchers, id)
}
func (self *Filters) loop() {
out:
for {
select {
case <-self.quit:
break out
case event := <-self.ch:
for _, watcher := range self.watchers {
if reflect.TypeOf(watcher) == reflect.TypeOf(event.filter) {
if watcher.Compare(event.filter) {
watcher.Trigger(event.data)
}
}
}
}
}
}
func (self *Filters) Match(a, b Filter) bool {
return reflect.TypeOf(a) == reflect.TypeOf(b) && a.Compare(b)
}
func (self *Filters) Get(i int) Filter {
return self.watchers[i]
}
|
