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https://github.com/etcd-io/etcd.git
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384cc76299
Provides two implementations of Recorder-- one that is non-blocking like the original version and one that provides a blocking channel to avoid busy waiting or racing in tests when no other synchronization is available.
96 lines
2.1 KiB
Go
96 lines
2.1 KiB
Go
// Copyright 2015 CoreOS, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package wait provides utility functions for polling, listening using Go
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// channel.
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package wait
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import (
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"sync"
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"github.com/coreos/etcd/pkg/testutil"
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)
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type Wait interface {
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Register(id uint64) <-chan interface{}
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Trigger(id uint64, x interface{})
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}
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type List struct {
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l sync.Mutex
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m map[uint64]chan interface{}
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}
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func New() *List {
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return &List{m: make(map[uint64]chan interface{})}
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}
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func (w *List) Register(id uint64) <-chan interface{} {
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w.l.Lock()
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defer w.l.Unlock()
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ch := w.m[id]
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if ch == nil {
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ch = make(chan interface{}, 1)
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w.m[id] = ch
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}
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return ch
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}
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func (w *List) Trigger(id uint64, x interface{}) {
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w.l.Lock()
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ch := w.m[id]
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delete(w.m, id)
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w.l.Unlock()
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if ch != nil {
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ch <- x
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close(ch)
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}
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}
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type WaitRecorder struct {
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Wait
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testutil.Recorder
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}
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type waitRecorder struct {
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testutil.RecorderBuffered
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}
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func NewRecorder() *WaitRecorder {
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wr := &waitRecorder{}
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return &WaitRecorder{Wait: wr, Recorder: wr}
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}
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func NewNop() Wait { return NewRecorder() }
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func (w *waitRecorder) Register(id uint64) <-chan interface{} {
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w.Record(testutil.Action{Name: "Register"})
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return nil
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}
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func (w *waitRecorder) Trigger(id uint64, x interface{}) {
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w.Record(testutil.Action{Name: "Trigger"})
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}
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type waitWithResponse struct {
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ch <-chan interface{}
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}
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func NewWithResponse(ch <-chan interface{}) Wait {
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return &waitWithResponse{ch: ch}
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}
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func (w *waitWithResponse) Register(id uint64) <-chan interface{} {
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return w.ch
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}
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func (w *waitWithResponse) Trigger(id uint64, x interface{}) {}
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