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parallel_brick.go
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/
parallel_brick.go
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package flow
import (
"sync"
"github.com/RyouZhang/async-go"
)
type ParallelBrick struct {
name string
lc ILifeCycle
hash func(*Message) int
subQueues []chan *Message
wg sync.WaitGroup
kernal func(*Message, chan<- *Message) error
// support merge
inMux sync.WaitGroup
inOnce sync.Once
inQueue chan *Message
resQueue chan *Message
// support route
chanSize int
outQueues []*routeItem
useDefaultOut bool
outQueue chan *Message
errQueue chan error
}
func (b *ParallelBrick) Name() string {
return b.name
}
func (b *ParallelBrick) AddLifeCycle(lc ILifeCycle) {
b.lc = lc
}
func (b *ParallelBrick) Linked(queue <-chan *Message) {
b.inMux.Add(1)
go func() {
defer b.inMux.Done()
for msg := range queue {
b.inQueue <- msg
}
}()
go b.inOnce.Do(func() {
b.inMux.Wait()
close(b.inQueue)
})
}
func (b *ParallelBrick) Output() <-chan *Message {
b.useDefaultOut = true
return b.outQueue
}
func (b *ParallelBrick) RouteOutput(method func(*Message) bool) <-chan *Message {
output := make(chan *Message, b.chanSize)
b.outQueues = append(b.outQueues, &routeItem{
method: method,
outQueue: output,
})
return output
}
func (b *ParallelBrick) Errors() <-chan error {
return b.errQueue
}
func (b *ParallelBrick) loop() {
for msg := range b.inQueue {
val := b.hash(msg)
queue := b.subQueues[val%len(b.subQueues)]
queue <- msg
}
for i, _ := range b.subQueues {
close(b.subQueues[i])
}
b.subQueues = nil
b.wg.Wait()
close(b.resQueue)
}
func (b *ParallelBrick) pump() {
for msg := range b.resQueue {
flag := false
for _, item := range b.outQueues {
if item.method == nil {
continue
}
res, err := async.Safety(func() (interface{}, error) {
res := item.method(msg)
return res, nil
})
if err != nil {
b.errQueue <- err
} else {
if res.(bool) {
flag = true
item.outQueue <- msg
break
}
}
}
if false == flag && b.useDefaultOut == true {
b.outQueue <- msg
}
}
for _, item := range b.outQueues {
close(item.outQueue)
}
close(b.outQueue)
close(b.errQueue)
b.lc.Done()
}
func (b *ParallelBrick) worker(queue <-chan *Message) {
defer b.wg.Done()
for msg := range queue {
_, err := async.Safety(func() (interface{}, error) {
err := b.kernal(msg, b.resQueue)
return nil, err
})
if err != nil {
b.errQueue <- err
}
}
}
func NewParallelBrick(
name string,
hash func(*Message) int,
kernal func(*Message, chan<- *Message) error,
workers int,
chanSize int) *ParallelBrick {
b := &ParallelBrick{
name: name,
hash: hash,
kernal: kernal,
chanSize: chanSize,
useDefaultOut: false,
subQueues: make([]chan *Message, 0),
outQueue: make(chan *Message, chanSize),
errQueue: make(chan error, 8),
inQueue: make(chan *Message, chanSize),
resQueue: make(chan *Message, chanSize),
outQueues: make([]*routeItem, 0),
}
if workers <= 1 {
workers = 1
}
for i := 0; i < workers; i++ {
b.wg.Add(1)
queue := make(chan *Message, chanSize)
b.subQueues = append(b.subQueues, queue)
go b.worker(queue)
}
go b.loop()
go b.pump()
return b
}