3f047be5aa
All code outside of cmd/ is licensed as LGPL. The headers now reflect this by calling the whole work "the go-ethereum library".
96 lines
2.1 KiB
Go
96 lines
2.1 KiB
Go
// Copyright 2014 The go-ethereum Authors
|
|
// This file is part of the go-ethereum library.
|
|
//
|
|
// 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.
|
|
//
|
|
// The go-ethereum library 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 the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
// Package filter implements event filters.
|
|
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]
|
|
}
|