https://github.com/etcd-io/etcd
Tip revision: fd17c9101d94703f6f4c3d8d6cfb72b62b894cd7 authored by Gyu-Ho Lee on 17 June 2016, 18:08:26 UTC
version: bump to v2.3.7
version: bump to v2.3.7
Tip revision: fd17c91
wait.go
// Copyright 2015 CoreOS, Inc.
//
// 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 wait provides utility functions for polling, listening using Go
// channel.
package wait
import (
"log"
"sync"
)
type Wait interface {
Register(id uint64) <-chan interface{}
Trigger(id uint64, x interface{})
}
type List struct {
l sync.Mutex
m map[uint64]chan interface{}
}
func New() *List {
return &List{m: make(map[uint64]chan interface{})}
}
func (w *List) Register(id uint64) <-chan interface{} {
w.l.Lock()
defer w.l.Unlock()
ch := w.m[id]
if ch == nil {
ch = make(chan interface{}, 1)
w.m[id] = ch
} else {
log.Panicf("dup id %x", id)
}
return ch
}
func (w *List) Trigger(id uint64, x interface{}) {
w.l.Lock()
ch := w.m[id]
delete(w.m, id)
w.l.Unlock()
if ch != nil {
ch <- x
close(ch)
}
}
type waitWithResponse struct {
ch <-chan interface{}
}
func NewWithResponse(ch <-chan interface{}) Wait {
return &waitWithResponse{ch: ch}
}
func (w *waitWithResponse) Register(id uint64) <-chan interface{} {
return w.ch
}
func (w *waitWithResponse) Trigger(id uint64, x interface{}) {}