jx-callback/business/jxutils/tasksch/parallel_task.go

package tasksch

import (
	"errors"
	"time"

	"git.rosy.net.cn/baseapi/utils"
	"git.rosy.net.cn/jx-callback/business/jxutils"
	"git.rosy.net.cn/jx-callback/business/jxutils/jxcontext"
	"git.rosy.net.cn/jx-callback/globals"
)

const (
	DefParallelCount = 10
	MaxParallelCount = 50
)

type WorkFunc func(task *ParallelTask, batchItemList []interface{}, params ...interface{}) (retVal interface{}, err error)
type ResultHandlerFunc func(taskName string, result []interface{}, err error)

type ParallelConfig struct {
	// ParentTask          ITask
	// IsAsync             bool
	ParallelCount       int
	BatchSize           int
	IsContinueWhenError bool
	ResultHandler       ResultHandlerFunc
}

type ParallelTask struct {
	BaseTask

	resultHandler ResultHandlerFunc
	worker        WorkFunc
	jobList       [][]interface{}
	taskChan      chan []interface{}
	subFinishChan chan interface{}
}

var (
	ErrTaskNotFinished = errors.New("任务还未完成")
	ErrTaskIsCanceled  = errors.New("任务被取消了")
)

func NewParallelConfig() *ParallelConfig {
	return &ParallelConfig{
		// ParentTask:          parentTask,
		// IsAsync:             false,
		IsContinueWhenError: false,
		ParallelCount:       DefParallelCount,
		BatchSize:           1,
		ResultHandler:       nil,
	}
}

func (c *ParallelConfig) SetParallelCount(parallelCount int) *ParallelConfig {
	c.ParallelCount = parallelCount
	return c
}

func (c *ParallelConfig) SetBatchSize(batchSize int) *ParallelConfig {
	c.BatchSize = batchSize
	return c
}

func (c *ParallelConfig) SetIsContinueWhenError(isContinueWhenError bool) *ParallelConfig {
	c.IsContinueWhenError = isContinueWhenError
	return c
}

// func (c *ParallelConfig) SetIsAsync(isAsync bool) *ParallelConfig {
// 	c.IsAsync = isAsync
// 	return c
// }

func (c *ParallelConfig) SetResultHandler(resultHandler ResultHandlerFunc) *ParallelConfig {
	c.ResultHandler = resultHandler
	return c
}

func NewParallelTask(taskName string, config *ParallelConfig, ctx *jxcontext.Context, worker WorkFunc, itemList interface{}, params ...interface{}) *ParallelTask {
	if config == nil {
		config = NewParallelConfig()
	}
	if config.ParallelCount == 0 {
		config.ParallelCount = DefParallelCount
	}
	if config.ParallelCount > MaxParallelCount {
		config.ParallelCount = MaxParallelCount
	}
	realItemList := utils.Interface2Slice(itemList)
	jobList := jxutils.SplitSlice(realItemList, config.BatchSize)
	jobListLen := len(jobList)
	if config.ParallelCount > jobListLen {
		config.ParallelCount = jobListLen
	}
	task := &ParallelTask{
		subFinishChan: make(chan interface{}, config.ParallelCount),
		taskChan:      make(chan []interface{}, len(realItemList)),
		resultHandler: config.ResultHandler,
		worker:        worker,
		jobList:       jobList,
	}
	task.Init(config.ParallelCount, config.BatchSize, config.IsContinueWhenError, params, taskName, ctx, len(realItemList), jobListLen)
	return task
}

func (task *ParallelTask) Run() {
	task.run(func() {
		globals.SugarLogger.Debugf("ParallelTask.Run %s", task.Name)
		for i := 0; i < task.ParallelCount; i++ {
			utils.CallFuncAsync(func() {
				var chanRetVal interface{}
				retVal := make([]interface{}, 0)
				for {
					select {
					case <-task.quitChan: // 取消
						goto end
					default:
						select {
						case job, ok := <-task.taskChan:
							if !ok { // 任务完成
								chanRetVal = retVal
								goto end
							} else {
								result, err := task.callWorker(func() (retVal interface{}, err error) {
									return task.worker(task, job, task.params...)
								})
								// globals.SugarLogger.Debugf("ParallelTask.Run %s, after call worker result:%v, err:%v", task.Name, result, err)
								task.finishedOneJob(len(job), err)
								if err == nil {
									if result != nil {
										retVal = append(retVal, utils.Interface2Slice(result)...)
									}
								} else {
									globals.SugarLogger.Infof("ParallelTask.Run %s, subtask(job:%s, params:%s) result:%v, failed with error:%v", task.Name, utils.Format4Output(job, true), utils.Format4Output(task.params, true), result, err)
									if !task.IsContinueWhenError { // 出错
										chanRetVal = err
										goto end
									}
									task.locker.Lock()
									task.detailErrMsgList = append(task.detailErrMsgList, err.Error())
									task.locker.Unlock()
								}
							}
						}
					}
				}
			end:
				// globals.SugarLogger.Debugf("ParallelTask.Run %s, put to chann chanRetVal:%v", task.Name, chanRetVal)
				task.locker.RLock()
				if task.Status < TaskStatusEndBegin {
					task.subFinishChan <- chanRetVal
				}
				task.locker.RUnlock()
			})
		}
		for _, job := range task.jobList {
			task.taskChan <- job
		}
		close(task.taskChan)

		taskResult := make([]interface{}, 0)
		var taskErr error
		for i := 0; i < task.ParallelCount; i++ {
			result := <-task.subFinishChan
			// globals.SugarLogger.Debugf("ParallelTask.Run %s, received from chann result:%v", taskName, result)
			if err, ok := result.(error); ok {
				task.Cancel()
				taskResult = nil
				taskErr = err
				break // 出错情况下是否需要直接跳出？
			} else if result != nil {
				resultList := result.([]interface{})
				taskResult = append(taskResult, resultList...)
			}
		}

		task.locker.Lock()
		if taskErr != nil { // 如果有错误，肯定就是失败了
			task.Status = TaskStatusFailed
		} else {
			if len(task.taskChan) > 0 {
				taskErr = ErrTaskIsCanceled
				task.Status = TaskStatusCanceled
			} else {
				task.Status = TaskStatusFinished
			}
		}
		if taskErr != nil {
			task.Err = NewTaskError(task.Name, taskErr)
		} else {
			task.Err = task.buildTaskErrFromDetail()
		}
		task.Result = taskResult
		task.TerminatedAt = time.Now()
		task.locker.Unlock()
		globals.SugarLogger.Debugf("ParallelTask.Run %s, err:%v", task.Name, task.Err)
		close(task.subFinishChan)

		if task.resultHandler != nil {
			task.resultHandler(task.Name, taskResult, task.Err)
		}
	})
}

func (t *ParallelTask) AddChild(task ITask) ITask {
	task.SetParent(t)
	return t.BaseTask.AddChild(task)
}