Microservice task scheduler written in Go language

Microservice task scheduler written in Go language

Introduction:
With the popularity of microservice architecture, task scheduler has become an integral part of various systems Essential component. Through the task scheduler, we can implement functions such as scheduled execution of tasks, processing of task dependencies, and monitoring of task execution results. This article will introduce the implementation method of microservice task scheduler written in Go language and illustrate it through code examples.

1. Task scheduling model design

1. Task model
   The core of the task scheduler is task scheduling, so the task model needs to be defined first. A task can contain the following attributes:
2. ID: The unique identifier of the task, used to uniquely identify the task.
3. Name: The name of the task, used to describe the task.
4. Cron: The scheduling period of the task, which can be a fixed time, interval or expression.
5. Dependencies: Task dependencies, indicating the task’s predecessor tasks.
6. Handler: Task processing function, used to execute specific task logic.

You can define the task model through the following code:

type Task struct {

ID           string
Name         string
Cron         string
Dependencies []string
Handler      func() error

}

2. Task scheduler model
   The task scheduler needs to have functions such as task addition, task deletion, task execution, and task dependency processing. The model of the task scheduler can be defined through the following code:

type Scheduler struct {

m sync.Mutex
tasks map[string]*Task
dependencies map[string][]string

}

3. Task scheduler method implementation
   Connection Next, we need to implement the task scheduler method. You can add tasks, delete tasks, execute tasks, handle task dependencies and other functions to the task scheduler through the following code:

func (s Scheduler) AddTask(task Task) {

s.m.Lock()
defer s.m.Unlock()

s.tasks[task.ID] = task
// 处理任务依赖关系
for _, dependency := range task.Dependencies {
    s.dependencies[dependency] = append(s.dependencies[dependency], task.ID)
}

}

func (s *Scheduler) RemoveTask(taskID string) {

s.m.Lock()
defer s.m.Unlock()

task, ok := s.tasks[taskID]
if ok {
    delete(s.tasks, taskID)
    // 清理任务依赖关系
    for _, dependent := range s.dependencies[taskID] {
        dependentTask, ok := s.tasks[dependent]
        if ok {
            dependentTask.Dependencies = remove(dependentTask.Dependencies, taskID)
        }
    }
    delete(s.dependencies, taskID)
}

}

func (s *Scheduler) RunTask(taskID string) {

s.m.Lock()
defer s.m.Unlock()

task, ok := s.tasks[taskID]
if ok {
    err := task.Handler()
    if err != nil {
        fmt.Printf("Task %s failed to execute: %s

", taskID, err.Error())

    }
}

}

func (s *Scheduler) handleDependencies(taskID string) {

dependentTasks, ok := s.dependencies[taskID]
if ok {
    for _, dependent := range dependentTasks {
        s.RunTask(dependent)
    }
}

}

func (s *Scheduler) RunAllTasks() {

s.m.Lock()
defer s.m.Unlock()

for _, task := range s.tasks {
    s.RunTask(task.ID)
}

}

Code analysis:

• The AddTask method is used to add tasks to tasks Add tasks to the scheduler and handle task dependencies.
• RemoveTask method is used to remove tasks from the task scheduler and clean up task dependencies.
• RunTask method is used to execute tasks , and print the error message that the task execution failed.
• The handleDependencies method is used to handle the dependencies of the task, that is, execute all tasks that depend on the specified task.
• The RunAllTasks method is used in the execution scheduler All tasks.

2. Usage Example
The following is a simple example to show how to use the microservice task scheduler.

func main() {

scheduler := &Scheduler{
    tasks:        make(map[string]*Task),
    dependencies: make(map[string][]string),
}

// 初始化任务
task1 := &Task{
    ID:   "1",
    Name: "Task 1",
    Cron: "* * * * *", // 每分钟执行一次
    Handler: func() error {
        fmt.Println("Task 1 Executed")
        return nil
    },
}
task2 := &Task{
    ID:           "2",
    Name:         "Task 2",
    Cron:         "* * * * *", // 每分钟执行一次
    Dependencies: []string{"1"},
    Handler: func() error {
        fmt.Println("Task 2 Executed")
        return nil
    },
}

// 添加任务到任务调度器中
scheduler.AddTask(task1)
scheduler.AddTask(task2)

// 执行任务
scheduler.RunAllTasks()

// 删除任务
scheduler.RemoveTask("2")

// 再次执行任务
scheduler.RunAllTasks()

}

Code analysis:

• First, we create a task scheduler instance and initialize the task scheduler.
• Then, we create Two tasks, and set the scheduling cycle, dependencies and processing functions of the tasks.
• Next, we add the task to the task scheduler.
• Then, we execute the tasks in the task scheduler All tasks.
• Finally, we delete a task and execute all tasks in the task scheduler again.

Summary:
This article introduces the microprocessor written in Go language The implementation method of the service task scheduler is explained through code examples. Through the task scheduler, we can implement functions such as scheduled execution of tasks, processing of task dependencies, and monitoring of task execution results, providing a microservice architecture for the system. Provides powerful task scheduling support.

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