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event.go
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event.go
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// Copyright (C) 2014-2018 Goodrain Co., Ltd.
// RAINBOND, Application Management Platform
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version. For any non-GPL usage of Rainbond,
// one or multiple Commercial Licenses authorized by Goodrain Co., Ltd.
// must be obtained first.
// This program 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 General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package event
import (
"fmt"
"os"
"os/signal"
"reflect"
"syscall"
)
const (
EXIT = "exit"
WAIT = "wait"
)
var (
Events = make(map[string][]func(interface{}), 2)
)
func On(name string, fs ...func(interface{})) error {
evs, ok := Events[name]
if !ok {
evs = make([]func(interface{}), 0, len(fs))
}
for _, f := range fs {
fp := reflect.ValueOf(f).Pointer()
for i := 0; i < len(evs); i++ {
if reflect.ValueOf(evs[i]).Pointer() == fp {
return fmt.Errorf("func[%v] already exists in event[%s]", fp, name)
}
}
evs = append(evs, f)
}
Events[name] = evs
return nil
}
func Emit(name string, arg interface{}) {
evs, ok := Events[name]
if !ok {
return
}
for _, f := range evs {
f(arg)
}
}
func EmitAll(arg interface{}) {
for _, fs := range Events {
for _, f := range fs {
f(arg)
}
}
return
}
func Off(name string, f func(interface{})) error {
evs, ok := Events[name]
if !ok || len(evs) == 0 {
return fmt.Errorf("envet[%s] doesn't have any funcs", name)
}
fp := reflect.ValueOf(f).Pointer()
for i := 0; i < len(evs); i++ {
if reflect.ValueOf(evs[i]).Pointer() == fp {
evs = append(evs[:i], evs[i+1:]...)
Events[name] = evs
return nil
}
}
return fmt.Errorf("%v func dones't exist in event[%s]", fp, name)
}
func OffAll(name string) error {
Events[name] = nil
return nil
}
// 等待信号
// 如果信号参数为空,则会等待常见的终止信号
// SIGINT 2 A 键盘中断(如break键被按下)
// SIGTERM 15 A 终止信号
func Wait(sig ...os.Signal) os.Signal {
c := make(chan os.Signal, 1)
if len(sig) == 0 {
signal.Notify(c, syscall.SIGINT, syscall.SIGTERM)
} else {
signal.Notify(c, sig...)
}
return <-c
}