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util.go
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util.go
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// Copyright 2018 ETH Zurich
//
// 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 reconnect
import (
"sync"
)
type AtomicBool struct {
m sync.Mutex
v bool
}
func (f *AtomicBool) Set(v bool) {
f.m.Lock()
f.v = v
f.m.Unlock()
}
func (f *AtomicBool) IsTrue() bool {
f.m.Lock()
result := f.v == true
f.m.Unlock()
return result
}
func (f *AtomicBool) IsFalse() bool {
return !f.IsTrue()
}
// A State objects encodes an up or down state in a way that can be used
// directly in selects. Note that not all methods are safe for concurrent use
// (see their documentation for more information).
type State struct {
ch chan struct{}
}
// NewState returns a new state. The state is initially set to up.
func NewState() *State {
s := &State{ch: make(chan struct{})}
s.SetUp()
return s
}
// SetDown sets the state to down.
//
// It is not safe to call SetDown concurrently with other methods.
func (s *State) SetDown() {
s.ch = make(chan struct{})
}
// SetUp sets the state to up.
//
// It is safe to call SetUp concurrently with Up.
func (s *State) SetUp() {
close(s.ch)
}
// Up yields a channel that will be closed once SetUp() is called.
//
// It is safe to call SetUp concurrently with Up.
func (s *State) Up() <-chan struct{} {
return s.ch
}