59 lines
1.4 KiB
Go
59 lines
1.4 KiB
Go
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/*
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Copyright 2014 The Kubernetes Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package async
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import (
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"sync"
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)
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// Runner is an abstraction to make it easy to start and stop groups of things that can be
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// described by a single function which waits on a channel close to exit.
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type Runner struct {
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lock sync.Mutex
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loopFuncs []func(stop chan struct{})
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stop *chan struct{}
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}
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// NewRunner makes a runner for the given function(s). The function(s) should loop until
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// the channel is closed.
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func NewRunner(f ...func(stop chan struct{})) *Runner {
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return &Runner{loopFuncs: f}
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}
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// Start begins running.
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func (r *Runner) Start() {
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r.lock.Lock()
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defer r.lock.Unlock()
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if r.stop == nil {
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c := make(chan struct{})
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r.stop = &c
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for i := range r.loopFuncs {
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go r.loopFuncs[i](*r.stop)
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}
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}
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}
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// Stop stops running.
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func (r *Runner) Stop() {
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r.lock.Lock()
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defer r.lock.Unlock()
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if r.stop != nil {
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close(*r.stop)
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r.stop = nil
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}
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}
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