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datapool.go
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datapool.go
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package octopus
import(
"time"
"math"
"runtime"
"sync"
"sync/atomic"
)
type dataWorker struct {
pool *DataProcessPool
jobChannel chan Future
stop chan bool
}
func (w *dataWorker) getStopChannel() chan bool {
return w.stop
}
func (w *dataWorker) getJobChannel() chan Future {
return w.jobChannel
}
func executeData(pool *DataProcessPool, future Future) interface{} {
defer func() {
if err := recover(); err != nil {
future.setStatus(JOBCRASH)
pool.log("panic: " + err.(string))
}
}()
result := pool.fn(future.getData())
return result
}
func (w *dataWorker) start() {
timer := time.NewTimer(w.pool.keepAliveTime)
go func() {
var job Future
for {
timer.Reset(w.pool.keepAliveTime)
w.pool.workerChannel <- w
select {
case job = <- w.jobChannel :
w.pool.activeCount = w.pool.activeCount + 1
w.pool.wg.Add(1)
result :=executeData(w.pool, job)
job.getResultChannel() <- result
w.pool.wg.Done()
w.pool.activeCount = w.pool.activeCount - 1
w.pool.completedJobCount = w.pool.completedJobCount + 1
// if get job timeout
case <- timer.C :
if w.pool.poolSize > w.pool.minPoolSize {
w.pool.poolSize = w.pool.poolSize - 1
return
} else {
select {
case job = <- w.jobChannel :
w.pool.activeCount = w.pool.activeCount + 1
w.pool.wg.Add(1)
result := w.pool.fn(job.getData())
job.getResultChannel() <- result
w.pool.wg.Done()
w.pool.activeCount = w.pool.activeCount - 1
w.pool.completedJobCount = w.pool.completedJobCount + 1
case stop := <- w.stop :
if stop {
w.pool.poolSize = w.pool.poolSize - 1
w.stop <- true
return
}
}
}
case stop := <- w.stop :
if stop {
w.pool.poolSize = w.pool.poolSize - 1
w.stop <- true
return
}
}
}
}()
}
func newDataWorker(dataprocesspool *DataProcessPool) *dataWorker {
return &dataWorker {
pool : dataprocesspool ,
jobChannel : make(chan Future) ,
stop : make(chan bool) ,
}
}
type DataProcessPool struct {
workerChannel chan worker
jobChannel chan Future
stop chan bool
isPoolOpen uint32
isShutdownNow bool
canDropJob bool
wg *sync.WaitGroup
minPoolSize uint64
poolSize uint64
maxPoolSize uint64
keepAliveTime time.Duration
awaitWokerTime time.Duration
activeCount uint64
completedJobCount uint64
logFunc LogFunc
fn DataProcessFunc
}
// Creates a goroutine pool for processing data by defining a DataProcessFunction that reuses a fixed number of goroutines.
func NewFixDataProcessPool(workerNum uint64, fn DataProcessFunc) (dataProcessPool *DataProcessPool, err error) {
dataProcessPool, err = NewBaseDataProcessPool(workerNum, workerNum, 60*time.Second, 1*time.Second, fn)
return
}
// Creates a goroutine pool that creates new goroutines as needed for processing data by defining a DataProcessFunction, but will reuse previously constructed goroutines when they are available.
func NewCachedDataProcessPool(fn DataProcessFunc) (dataProcessPool *DataProcessPool, err error) {
dataProcessPool, err = NewBaseDataProcessPool(uint64(runtime.NumCPU()), math.MaxUint64, 60*time.Second, 1*time.Second, fn)
return
}
// Creates a goroutine pool for processing data by defining a DataProcessFunction with MinPoolSize , MaxPoolSize, the KeepAliveTime of a worker, the time of manager await worker.
// Please note that the KeepAliveTime must be greater than one second.
func NewBaseDataProcessPool(MinPoolSize uint64, MaxPoolSize uint64, KeepAliveTime time.Duration, AwaitWokerTime time.Duration, ProcessFn DataProcessFunc) (dataProcessPool *DataProcessPool, err error) {
if MaxPoolSize == 0 {
err = ErrInvalidArguments
return
}
if KeepAliveTime < 1*time.Second {
err = ErrKeepAliveTimeArguments
return
}
wc := make(chan worker, MinPoolSize)
jc := make(chan Future, MinPoolSize)
sc := make(chan bool)
pool := &DataProcessPool {
workerChannel : wc ,
jobChannel : jc ,
stop : sc,
isPoolOpen : poolOpen ,
isShutdownNow : false ,
canDropJob : false ,
wg : &sync.WaitGroup{},
minPoolSize : MinPoolSize,
poolSize : MinPoolSize,
maxPoolSize : MaxPoolSize,
activeCount : 0,
keepAliveTime : KeepAliveTime,
awaitWokerTime : AwaitWokerTime,
completedJobCount : 0,
fn : ProcessFn,
}
for i := 0; i < int(MinPoolSize); i++ {
w := newDataWorker(pool)
w.start()
}
go pool.manager()
dataProcessPool = pool
return
}
func (pool *DataProcessPool) manager() {
pool.log("WorkPool Manager : started")
timer := time.NewTimer(pool.awaitWokerTime)
for {
timer.Reset(pool.awaitWokerTime)
select {
case w := <- pool.workerChannel :
select {
case job := <- pool.jobChannel :
w.getJobChannel() <- job
default:
pool.workerChannel <- w
}
case <-timer.C :
if !pool.canDropJob {
if pool.GetPoolSize() < pool.GetMaxPoolSize() {
pool.log("WorkPool Manager : add routine")
worker := newDataWorker(pool)
worker.start()
pool.poolSize = pool.poolSize + 1
}
} else {
select {
case <- pool.jobChannel :
pool.log("WorkPool Manager : drop job")
default:
}
}
case stop := <- pool.stop :
if stop {
pool.log("WorkPool Manager : stop pool begin")
close(pool.jobChannel)
if len(pool.jobChannel) > 0 {
for j := range pool.jobChannel {
w := <- pool.workerChannel
w.getJobChannel() <- j
}
}
if pool.isShutdownNow {
pool.wg.Wait()
}
for pool.poolSize != 0 {
worker := <- pool.workerChannel
worker.getStopChannel() <- true
<-worker.getStopChannel()
}
pool.stop <- true
pool.log("WorkPool Manager : stop pool end")
return
}
}
}
}
// Set drop job data if await worker timeout, it will drop job datas when manager appears awaitWorkerTime timeout.
func (pool *DataProcessPool) SetDropJob(ok bool) {
pool.canDropJob = ok
}
// CanDropJob will return if the manager will drop job datas when pool is busy.
func (pool *DataProcessPool) CanDropJob() bool {
return pool.canDropJob
}
func (pool *DataProcessPool) log(msg string) {
if pool.logFunc != nil {
pool.logFunc(msg)
}
}
// Return approximate total number of goroutines in pool.
func (pool *DataProcessPool) GetPoolSize() uint64 {
return pool.poolSize
}
// Return the approximate total number of woker executing a job data in pool.
func (pool *DataProcessPool) GetActiveCount() uint64 {
return pool.activeCount
}
// Return the approximate total number of jobs that have completed execution.
func (pool *DataProcessPool) GetCompletedJobCount() uint64 {
return pool.completedJobCount
}
// if pool is close it will return true.
func (pool *DataProcessPool) IsShutDown() bool {
return (atomic.LoadUint32(&pool.isPoolOpen) == poolClose)
}
// Set a log function to record log infos.
func (pool *DataProcessPool) SetLogFunc(function LogFunc) {
pool.logFunc = function
}
// Set the minimum number of goroutines.
func (pool *DataProcessPool) SetMinPoolSize(minPoolSize uint64) {
pool.minPoolSize = minPoolSize
}
// Return the minimum number of goroutines.
func (pool *DataProcessPool) GetMinPoolSize() uint64 {
return pool.minPoolSize
}
// Set the maximum allowed number of goroutines.
func (pool *DataProcessPool) SetMaxPoolSize(maxPoolSize uint64) {
pool.maxPoolSize = maxPoolSize
}
// Return the maximum allowed number of goroutines.
func (pool *DataProcessPool) GetMaxPoolSize() uint64 {
return pool.maxPoolSize
}
// Return the KeepAliveTime of a worker.
func (pool *DataProcessPool) GetKeepAliveTime() time.Duration {
return pool.keepAliveTime
}
// Set the KeepAliveTime of a worker. Please note that it must be greater than one second.
func (pool *DataProcessPool) SetKeepAliveTime(keepAliveTime time.Duration) error {
if keepAliveTime < 1*time.Second {
return ErrKeepAliveTimeArguments
}
pool.keepAliveTime = keepAliveTime
return nil
}
// Return the awaitWorkerTime of pool manager.
func (pool *DataProcessPool) GetAwaitWorkerTime() time.Duration {
return pool.awaitWokerTime
}
// Submit a job data for execution and return a Future representing the calculating result of that job data.
func (pool *DataProcessPool) Submit(job interface{}) (future Future, err error) {
if pool.IsShutDown() {
err = ErrPoolShutdown
return
}
future = newDataFuture(pool, job)
pool.jobChannel <- future
return
}
// Close the pool and wait for all goroutines done, it may be block.
func (pool *DataProcessPool) Shutdown() {
if pool.IsShutDown() {
return
}
atomic.SwapUint32(&pool.isPoolOpen, poolClose)
pool.isShutdownNow = false
pool.stop <- true
<- pool.stop
close(pool.stop)
}
// Close the pool but will not wait for all goroutines done, it will be never block.
func (pool *DataProcessPool) ShutdownNow() {
if pool.IsShutDown() {
return
}
atomic.SwapUint32(&pool.isPoolOpen, poolClose)
pool.isShutdownNow = true
pool.stop <- true
close(pool.stop)
}