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batcher.go
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batcher.go
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package msgqueue
import (
"errors"
"sync"
"sync/atomic"
"time"
)
var errBatched = errors.New("message is batched")
type BatcherOptions struct {
Handler func([]*Message) error
Splitter func([]*Message) ([]*Message, []*Message)
RetryLimit int
Timeout time.Duration
}
func (opt *BatcherOptions) init(p *Processor) {
if opt.RetryLimit == 0 {
opt.RetryLimit = p.Options().RetryLimit
}
if opt.Timeout == 0 {
opt.Timeout = 3 * time.Second
}
}
// Batcher collects messages for later batch processing.
type Batcher struct {
p *Processor
opt *BatcherOptions
timer *time.Timer
_sync uint32 // atomic
wg sync.WaitGroup
mu sync.Mutex
msgs []*Message
}
func NewBatcher(p *Processor, opt *BatcherOptions) *Batcher {
opt.init(p)
b := Batcher{
p: p,
opt: opt,
}
b.timer = time.AfterFunc(time.Minute, b.onTimeout)
b.timer.Stop()
return &b
}
func (b *Batcher) SetSync(v bool) {
var n uint32
if v {
n = 1
}
atomic.StoreUint32(&b._sync, n)
if !v {
return
}
b.mu.Lock()
b.wait()
b.mu.Unlock()
}
func (b *Batcher) wait() {
if len(b.msgs) > 0 {
b.process(b.msgs)
b.msgs = nil
}
}
func (b *Batcher) isSync() bool {
return atomic.LoadUint32(&b._sync) == 1
}
func (b *Batcher) Add(msg *Message) error {
var msgs []*Message
b.mu.Lock()
if len(b.msgs) == 0 {
b.stopTimer()
b.timer.Reset(b.opt.Timeout)
}
b.msgs = append(b.msgs, msg)
if b.isSync() {
msgs = b.msgs
b.msgs = nil
} else {
msgs, b.msgs = b.opt.Splitter(b.msgs)
}
b.mu.Unlock()
if len(msgs) > 0 {
b.process(msgs)
}
return errBatched
}
func (b *Batcher) process(msgs []*Message) {
err := b.opt.Handler(msgs)
for _, msg := range msgs {
if msg.Err == nil && err != nil {
msg.Err = err
}
b.p.Put(msg)
}
}
func (b *Batcher) onTimeout() {
b.mu.Lock()
b.wait()
b.mu.Unlock()
}
func (b *Batcher) Close() error {
b.mu.Lock()
b.stopTimer()
b.wait()
b.mu.Unlock()
return nil
}
func (b *Batcher) stopTimer() {
if !b.timer.Stop() {
select {
case <-b.timer.C:
default:
}
}
}