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input.go
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/
input.go
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package processing
import (
"io"
"sync"
)
type Decoder interface {
DecodeNext() (interface{}, error)
}
type Marshaler interface {
Marshal(interface{}) ([]byte, error)
}
type Worker interface {
MakeHandler(uint) Handler
Success() uint
Failure() uint
Total() uint
Done()
RunCount() uint
}
type Handler func(interface{}) interface{}
func Process(in Decoder, out io.Writer, w Worker, m Marshaler, workers uint) {
processQueue := make(chan interface{}, workers*4)
outputQueue := make(chan []byte, workers*4)
// Create wait groups
var workerDone sync.WaitGroup
var outputDone sync.WaitGroup
workerDone.Add(int(workers))
outputDone.Add(1)
// Start the output encoder
go func() {
for result := range outputQueue {
if _, err := out.Write(result); err != nil {
panic(err.Error())
}
if _, err := out.Write([]byte("\n")); err != nil {
panic(err.Error())
}
}
outputDone.Done()
}()
// Start all the workers
for i := uint(0); i < workers; i++ {
handler := w.MakeHandler(i)
runCount := w.RunCount()
go func(handler Handler) {
for obj := range processQueue {
for run := uint(0); run < runCount; run++ {
result := handler(obj)
enc, err := m.Marshal(result)
if err != nil {
panic(err.Error())
}
outputQueue <- enc
}
}
workerDone.Done()
}(handler)
}
// Read the input, send to workers
for {
obj, err := in.DecodeNext()
if err == io.EOF {
break
}
processQueue <- obj
}
close(processQueue)
workerDone.Wait()
close(outputQueue)
outputDone.Wait()
w.Done()
}