/
parallel.go
93 lines (82 loc) · 2.15 KB
/
parallel.go
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// Copyright 2020 Douyu
//
// 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 xgo
import (
"sync"
"golang.org/x/sync/errgroup"
)
// ParallelWithError ...
func ParallelWithError(fns ...func() error) func() error {
return func() error {
eg := errgroup.Group{}
for _, fn := range fns {
eg.Go(fn)
}
return eg.Wait()
}
}
// ParallelWithErrorChan calls the passed functions in a goroutine, returns a chan of errors.
// fns会并发执行,chan error
func ParallelWithErrorChan(fns ...func() error) chan error {
total := len(fns)
errs := make(chan error, total)
var wg sync.WaitGroup
wg.Add(total)
go func(errs chan error) {
wg.Wait()
close(errs)
}(errs)
for _, fn := range fns {
go func(fn func() error, errs chan error) {
defer wg.Done()
errs <- try(fn, nil)
}(fn, errs)
}
return errs
}
// RestrictParallelWithErrorChan calls the passed functions in a goroutine, limiting the number of goroutines running at the same time,
// returns a chan of errors.
func RestrictParallelWithErrorChan(concurrency int, fns ...func() error) chan error {
total := len(fns)
if concurrency <= 0 {
concurrency = 1
}
if concurrency > total {
concurrency = total
}
var wg sync.WaitGroup
errs := make(chan error, total)
jobs := make(chan func() error, concurrency)
wg.Add(concurrency)
for i := 0; i < concurrency; i++ {
//consumer
go func(jobs chan func() error, errs chan error) {
defer wg.Done()
for fn := range jobs {
errs <- try(fn, nil)
}
}(jobs, errs)
}
go func(errs chan error) {
//producer
for _, fn := range fns {
jobs <- fn
}
close(jobs)
//wait for block errs
wg.Wait()
close(errs)
}(errs)
return errs
}