Share a Taskflow framework developed based on Golang

Go is a popular programming language known for its efficiency, simplicity and easy extensibility. At the same time, it is also a language suitable for concurrent programming. Its Goroutine and Channel mechanisms make concurrent programming extremely easy. In this article, I will introduce a Taskflow framework developed based on Golang. Under this framework, we can write a task process very conveniently. Below, I will briefly introduce its usage:

Taskflow API

There are three important APIs in the Taskflow framework, which are:

1. NewTaskflow(): Used to declare a new task process.
2. AddTask(): Used to add a new task to the task process. This method usually requires three parameters: task name, task code and task execution function.
3. Start(): used to start the task process.

Let’s take a look at the simplest example:

package main

import (
    "fmt"
    "github.com/trustasia-com/taskflow"
)

func main() {
    // 声明一个新的Taskflow
    tf := taskflow.NewTaskflow()
    // 添加一个名为“hello”的任务，并将任务代码设为1
    tf.AddTask("hello", 1, func(tf *taskflow.Taskflow) error {
        fmt.Println("Hello, Taskflow")
        return nil
    })
    // 启动任务流程
    tf.Start()
}

From the above example we can see that we first declare a new task process, and then add a name For the "hello" task, the task process is finally started. In the task code, we simply output a message. Run the program and the output is:

Hello, Taskflow

Although this example is simple, it gives us a basic understanding of the concept and use of Taskflow.

Task in Taskflow

In Taskflow, each Task is an independent execution unit, and they can be executed sequentially in a predetermined order. Each Task has a unique name and an execution code. In its execution code, Task can access the Taskflow object, so that it can know the execution status of other Tasks and the code that calls other Tasks. Next, let's take a look at how to use Taskflow to build a simple task process.

package main

import (
    "fmt"
    "github.com/trustasia-com/taskflow"
)

func main() {
    // 声明一个新的Taskflow
    tf := taskflow.NewTaskflow()

    // 添加三个名称为“t1”、“t2”和“t3”的任务
    tf.AddTask("t1", 1, func(tf *taskflow.Taskflow) error {
        fmt.Println("This is Task 1")
        return nil
    })
    tf.AddTask("t2", 2, func(tf *taskflow.Taskflow) error {
        fmt.Println("This is Task 2")
        return nil
    })
    tf.AddTask("t3", 3, func(tf *taskflow.Taskflow) error {
        fmt.Println("This is Task 3")
        return nil
    })

    // 在Taskflow中，Task可以通过其名称进行引用
    // 这里我们添加了一些依赖
    tf.Link("t1", "t2")
    tf.Link("t2", "t3")

    // 启动任务流程
    tf.Start()
}

In the above code, we used three Tasks and added them in order. In the execution code of each Task, we output the name of the Task.

Control of task process

In the Taskflow task process, we can also customize the task execution sequence and their interdependencies by controlling the drivers between tasks. This can be achieved through the Link method in Taskflow. The Link method accepts two parameters: the name of the source Task and the name of the target Task. For example, in the following code snippet, Task2 and Task3 are added as post-operations after Task1 is completed:

...
// 启动任务流程
tf.Start()
// 添加一个名称为“t4”的Task，并将其添加到“t1”之后
tf.AddTask("t4", 4, func(tf *taskflow.Taskflow) error {
    fmt.Println("This is Task 4")
    return nil
})
tf.Link("t1", "t4")
tf.Link("t4", "t2")
tf.Link("t4", "t3")
// 停止任务流程
tf.Stop()
...

In this code, we add a new Task (Task4) and pass it through Link Method takes it as a post-operation after Task1. Therefore, after Task1 completes, Task4 will be executed completely in parallel. We also linked Task2 and Task3 after Task4 to ensure that they start immediately after Task4 executes.

Summary

This article introduces the Taskflow framework and its simple usage. Although the API provided by Taskflow is very simple and practical, it is enough to help us complete most task process operations. In practical applications, Taskflow can help us easily define and control task processes, thereby greatly improving the maintainability and scalability of applications.

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