istio

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// Copyright Istio Authors
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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 queue
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import (
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	"fmt"
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	"time"
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)
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// WaitForClose blocks until the Instance has stopped processing tasks or the timeout expires.
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// If the timeout is zero, it will wait until the queue is done processing.
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// WaitForClose an error if the timeout expires.
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func WaitForClose(q Instance, timeout time.Duration) error {
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	closed := q.Closed()
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	if timeout == 0 {
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		<-closed
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		return nil
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	}
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	timer := time.NewTimer(timeout)
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	defer timer.Stop()
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	select {
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	case <-closed:
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		return nil
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	case <-timer.C:
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		return fmt.Errorf("timeout waiting for queue to close after %v", timeout)
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	}
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}
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