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/*
Copyright (C) 2019 Leo Tenenbaum
This file is part of AutoArt.
AutoArt is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
AutoArt is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with AutoArt. If not, see <https://www.gnu.org/licenses/>.
*/
package autoutils
import (
"fmt"
)
/*
This function runs f in batches of batchSize. n will be the number in the
sequence. f should send an error to errs if it wants this function to return
that error, and otherwise should send nil when it is done. Before each batch,
a message will be printed, starting with progress, and showing how many batches
have been completed so far out of the total number of batches.
*/
const batchSize = 32
func RunInBatches(number int64, progress string, f func (n int64, errs chan<- error)) error {
nBatches := number / batchSize
errs := make(chan error)
for batch := int64(0); batch <= nBatches; batch++ {
fmt.Println(progress, batch+1, "/", nBatches+1)
thisBatchSize := batchSize
if batch == nBatches {
// Deal with case of last batch
thisBatchSize = int(number - nBatches * batchSize)
}
for task := 0; task < thisBatchSize; task++ {
go f(int64(task) + batchSize * batch, errs)
}
for completed := 0; completed < thisBatchSize; completed++ {
err := <-errs
if err != nil {
return err
}
}
}
return nil
}
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