58 lines
1.4 KiB
Go
58 lines
1.4 KiB
Go
/*
|
|
Copyright 2014 The Kubernetes Authors.
|
|
|
|
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 async
|
|
|
|
import (
|
|
"sync"
|
|
)
|
|
|
|
// Runner is an abstraction to make it easy to start and stop groups of things that can be
|
|
// described by a single function which waits on a channel close to exit.
|
|
type Runner struct {
|
|
lock sync.Mutex
|
|
loopFuncs []func(stop chan struct{})
|
|
stop *chan struct{}
|
|
}
|
|
|
|
// NewRunner makes a runner for the given function(s). The function(s) should loop until
|
|
// the channel is closed.
|
|
func NewRunner(f ...func(stop chan struct{})) *Runner {
|
|
return &Runner{loopFuncs: f}
|
|
}
|
|
|
|
// Start begins running.
|
|
func (r *Runner) Start() {
|
|
r.lock.Lock()
|
|
defer r.lock.Unlock()
|
|
if r.stop == nil {
|
|
c := make(chan struct{})
|
|
r.stop = &c
|
|
for i := range r.loopFuncs {
|
|
go r.loopFuncs[i](*r.stop)
|
|
}
|
|
}
|
|
}
|
|
|
|
// Stop stops running.
|
|
func (r *Runner) Stop() {
|
|
r.lock.Lock()
|
|
defer r.lock.Unlock()
|
|
if r.stop != nil {
|
|
close(*r.stop)
|
|
r.stop = nil
|
|
}
|
|
}
|