example/main.go

package main

import (
	"fmt"
	"runtime"
	"time"

	"github.com/smartystreets/go-disruptor"
)

const (
	BufferSize = 1024 * 64
	BufferMask = BufferSize - 1
	Iterations = 1000000 * 100
)

var ringBuffer = [BufferSize]int64{}

func main() {
	runtime.GOMAXPROCS(2)

	written, read := disruptor.NewCursor(), disruptor.NewCursor()

	consumer := SampleConsumer{}
	reader := disruptor.NewReader(read, written, written, consumer)

	started := time.Now()

	go reader.Start()
	publish(written, read, reader)
	// consume(written, read)

	finished := time.Now()
	fmt.Println(Iterations, finished.Sub(started))
}

func publish(written, read *disruptor.Cursor, reader *disruptor.Reader) {
	previous := disruptor.InitialSequenceValue
	gate := disruptor.InitialSequenceValue

	for previous <= Iterations {
		next := previous + 1
		wrap := next - BufferSize

		for wrap > gate {
			gate = read.Sequence
			// if wrap > gate {
			// 	// time.Sleep(time.Nanosecond)
			// 	time.Sleep(time.Microsecond)
			// }
		}

		ringBuffer[next&BufferMask] = next
		written.Sequence = next
		previous = next
	}

	reader.Stop()
}

// func consume(reader *disruptor.Reader) {
// 	sleeps := 0

// 	// consumer := SampleConsumer{}

// 	// previous := int64(-1)
// 	// gate := int64(-1)
// 	// for previous < Iterations {
// 	// 	current := previous + 1
// 	// 	gate = written.Sequence

// 	// 	if current <= gate {

// 	// 		for current < gate {
// 	// 			current += consumer.Consume(current, gate)
// 	// 		}
// 	// 		// for current <= gate {

// 	// 		// 	if ringBuffer[current&BufferMask] > 0 {
// 	// 		// 	}

// 	// 		// 	current++
// 	// 		// }

// 	// 		previous = gate
// 	// 		read.Sequence = gate
// 	// 	} else {
// 	// 		sleeps++
// 	// 		time.Sleep(time.Microsecond)
// 	// 	}
// 	// }

// 	fmt.Println("Consumer sleeps:", sleeps)

// 	// for sequence, gate := int64(0), int64(0); sequence < Iterations; sequence++ {

// 	// 	// for gate <= sequence {
// 	// 	// 	gate = written.Sequence
// 	// 	// 	if gate <= sequence {
// 	// 	// 		time.Sleep(time.Microsecond)
// 	// 	// 	}
// 	// 	// }

// 	// 	// if ringBuffer[sequence&BufferMask] > 0 {
// 	// 	// }

// 	// 	// read.Sequence = sequence
// 	// }
// }

// // type Consumer interface {
// // 	Consume(lower, upper int64)
// // }

type SampleConsumer struct{}

func (this SampleConsumer) Consume(current, gate int64) int64 {
	// if ringBuffer[current&BufferMask] > 0 {
	// }

	return 1
}