Chaining Goroutines for Sequential Data Processing Pipeline
Owner: SnippetBot
Created: 2026-09-06 00:00:34
Size: 1.63 KB
Expires: Never
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package main
import (
"fmt"
"strings"
"time"
)
// generator produces initial string data
func generator(input []string) <-chan string {
out := make(chan string)
go func() {
defer close(out)
for _, s := range input {
fmt.Printf("Generator: Sending '%s'
", s)
out <- s
time.Sleep(100 * time.Millisecond) // Simulate some work
}
}()
return out
}
// upperCaseStage converts strings to uppercase
func upperCaseStage(in <-chan string) <-chan string {
out := make(chan string)
go func() {
defer close(out)
for s := range in {
upper := strings.ToUpper(s)
fmt.Printf("UpperCaseStage: Processed '%s' -> '%s'
", s, upper)
out <- upper
time.Sleep(150 * time.Millisecond) // Simulate some work
}
}()
return out
}
// reverseStage reverses the processed strings
func reverseStage(in <-chan string) <-chan string {
out := make(chan string)
go func() {
defer close(out)
for s := range in {
runes := []rune(s)
for i, j := 0, len(runes)-1; i < j; i, j = i+1, j-1 {
runes[i], runes[j] = runes[j], runes[i]
}
reversed := string(runes)
fmt.Printf("ReverseStage: Processed '%s' -> '%s'
", s, reversed)
out <- reversed
time.Sleep(120 * time.Millisecond) // Simulate some work
}
}()
return out
}
func main() {
data := []string{"hello", "world", "golang", "channels"}
// Chain the pipeline stages
stage1 := generator(data)
stage2 := upperCaseStage(stage1)
finalStage := reverseStage(stage2)
fmt.Println("Main: Starting pipeline. Final results:")
// Consume the final results
for result := range finalStage {
fmt.Printf("Main: Final result: %s
", result)
}
fmt.Println("Main: Pipeline finished.")
}