435c0d9fc8
This PR switches the Nomad repository from using govendor to Go modules for managing dependencies. Aspects of the Nomad workflow remain pretty much the same. The usual Makefile targets should continue to work as they always did. The API submodule simply defers to the parent Nomad version on the repository, keeping the semantics of API versioning that currently exists.
74 lines
1.5 KiB
Go
74 lines
1.5 KiB
Go
/*
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Copyright (c) 2014 VMware, Inc. All Rights Reserved.
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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 progress
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import "sync"
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type Aggregator struct {
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downstream Sinker
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upstream chan (<-chan Report)
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done chan struct{}
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w sync.WaitGroup
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}
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func NewAggregator(s Sinker) *Aggregator {
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a := &Aggregator{
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downstream: s,
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upstream: make(chan (<-chan Report)),
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done: make(chan struct{}),
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}
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a.w.Add(1)
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go a.loop()
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return a
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}
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func (a *Aggregator) loop() {
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defer a.w.Done()
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dch := a.downstream.Sink()
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defer close(dch)
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for {
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select {
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case uch := <-a.upstream:
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// Drain upstream channel
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for e := range uch {
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dch <- e
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}
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case <-a.done:
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return
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}
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}
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}
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func (a *Aggregator) Sink() chan<- Report {
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ch := make(chan Report)
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a.upstream <- ch
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return ch
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}
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// Done marks the aggregator as done. No more calls to Sink() may be made and
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// the downstream progress report channel will be closed when Done() returns.
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func (a *Aggregator) Done() {
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close(a.done)
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a.w.Wait()
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}
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