62 lines
1.1 KiB
Go
62 lines
1.1 KiB
Go
package kafka
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import (
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"context"
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"sync"
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)
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// runGroup is a collection of goroutines working together. If any one goroutine
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// stops, then all goroutines will be stopped.
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//
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// A zero runGroup is valid
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type runGroup struct {
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initOnce sync.Once
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ctx context.Context
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cancel context.CancelFunc
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wg sync.WaitGroup
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}
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func (r *runGroup) init() {
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if r.cancel == nil {
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r.ctx, r.cancel = context.WithCancel(context.Background())
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}
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}
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func (r *runGroup) WithContext(ctx context.Context) *runGroup {
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ctx, cancel := context.WithCancel(ctx)
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return &runGroup{
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ctx: ctx,
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cancel: cancel,
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}
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}
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// Wait blocks until all function calls have returned.
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func (r *runGroup) Wait() {
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r.wg.Wait()
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}
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// Stop stops the goroutines and waits for them to complete
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func (r *runGroup) Stop() {
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r.initOnce.Do(r.init)
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r.cancel()
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r.Wait()
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}
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// Go calls the given function in a new goroutine.
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//
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// The first call to return a non-nil error cancels the group; its error will be
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// returned by Wait.
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func (r *runGroup) Go(f func(stop <-chan struct{})) {
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r.initOnce.Do(r.init)
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r.wg.Add(1)
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go func() {
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defer r.wg.Done()
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defer r.cancel()
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f(r.ctx.Done())
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}()
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}
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