coc1961 / flow

Simple Golang Flow Framework

Flow

Simple framework to design workflows based on processes connected through channels.

Each process has an input channel and an output channel,the output channel is the input channel of the next process.

Each process is responsible for closing the output channel when no more information will be sent.

Each process will process the data received from its input channel until the end of the data.

Each created process can be reused in other flows

Creating a Process:

type Summarizer struct {
}

func (p Summarizer) Process(input flow.Chan, output flow.Chan, ctx flow.Context) {
    //Cast input and output channels
    in := input.(chan int)
    out := output.(chan int)

    //I close the output channel, when no more data to send
    defer close(out)


    //I add the input values ​​and accumulate the total
    tot:=0
    for {
        num, ok := <-in
        if !ok {
            break
        }
        tot += nuk
    }

    //Send the total to the output channel
    out <- tot

}

Creating a Flow

    // I create the flow with an instance of Process.
    // The input channel of the flow.
    // The output channel of the flow
    fl := flow.New(Summarizer{}, make(chan int, 0))

    // I create the flow data input channel
    input := make(chan string, 1)

    ctx := flow.Context{}

    //Start the flow
    outChan := fl.Start(input, ctx)

Using the Flow

    //Send data to the flow
    input <- 10
    input <- 20
    input <- 30
    input <- 40

    //No more data to send, I close the channel
    close(input)

    //Cast the flow outflow and get the result
    out := outChan.(chan int)
    total := <-out
    fmt.Println(total)

    //Printed Result is
    100

Adding Processes to the Flow

    // I create the flow with an instance of Process.
    // The input channel of the flow.
    // The output channel of the flow
    fl := flow.New(Summarizer{}, input, make(chan int, 0))

    // I add a new process to the flow ToString
    // This process has as input channel the output channel of Summarizer
    // The output channel of the ToString process is of type string
    // This process takes the Summarize total and transforms it into a string
    fl.Add(ToString{}, make(chan string, 0))

    // I create the flow data input channel
    input := make(chan string, 1)

    ctx := flow.Context{}

   //Start the flow
    outChan := fl.Start(input, ctx)

    // I execute the flow and now the total 100 number is transformed into a string as shown below

    //Cast the flow outflow and get the result
    out := outChan.(chan string)
    total := <-out
    fmt.Println(total)

    //Printed Result is
    "The Total is : 100"