RunAsync

Description

A function that returns a Future object. For more information, see Asynchronous programming in ColdFusion.

Returns

A Future object.

Syntax

RunAsync()

RunAsync(UDFMethod function)

RunAsync(UDFMethod function, long timeOut)

History

New in ColdFusion (2018 release).

Parameters

Parameter

Required/Optional

Description

function

Optional

Closure function that returns a Future object, which holds the result of execution, status, and so on.

timeOut

Optional

Timeout in milliseconds.

Example 1

<cfscript>
             //To run a function asynchronously and get the result
             future = runAsync(function(){
                           return "Hello World!";
                      });
             result = future;
             writeOutput(result.get());
</cfscript>

Example 2

In this example, you'll see how we chain two methods, display a result.

<cfscript>

// Define a function to fetch the response from a URL
function fetchResponseFromURL(url) {
    result = "";
    httpService = new http(method = "GET", charset = "utf-8", url = url);
    httpService.addParam(name = "q", type = "url", value = "cfml");
    result = httpService.send().getPrefix();
    writeDump(result);
    return result;
}

// once the response is fetched, do the processing (here we just deserialize the json)
future = runAsync(function(){
    return fetchResponseFromUrl("http://date.jsontest.com/");
    }).then( function(input){
        return deserializeJson(input.FileContent)
    });
    result = future.get()
    writedump(result);
</cfscript>

Output

Example 3

In this example, you'll see a non-blocking scenario where we've defined asynchronous functions to send email and SMS.

<cfscript>

// Define an asynchronous function to send an email
function sendEmailAsync(toAddress, subject, body) {
    cfmail(to=toAddress, subject=subject, body=body, type="html");
}

// Define an asynchronous function to send an SMS
function sendSmsAsync(phoneNumber, message) {
    // Replace the following line with your actual SMS sending logic
    // Example: sendSmsFunction(phoneNumber, message);
}

// List of recipients with real-world-like data
recipients = [
    { email: "recipient1@example.com", phone: "1234567890", subject: "Subject 1", body: "Body 1" },
    { email: "recipient2@example.com", phone: "0987654321", subject: "Subject 2", body: "Body 2" },
    { email: "recipient3@example.com", phone: "5555555555", subject: "Subject 3", body: "Body 3" },
    { email: "recipient4@example.com", phone: "6666666666", subject: "Subject 4", body: "Body 4" },
    { email: "recipient5@example.com", phone: "7777777777", subject: "Subject 5", body: "Body 5" },
    { email: "recipient6@example.com", phone: "8888888888", subject: "Subject 6", body: "Body 6" },
    { email: "recipient7@example.com", phone: "9999999999", subject: "Subject 7", body: "Body 7" },
    { email: "recipient8@example.com", phone: "1010101010", subject: "Subject 8", body: "Body 8" },
    { email: "recipient9@example.com", phone: "2020202020", subject: "Subject 9", body: "Body 9" },
    { email: "recipient10@example.com", phone: "3030303030", subject: "Subject 10", body: "Body 10" }
];

// Start the email sending process asynchronously for each recipient
for (var i = 1; i <= arrayLen(recipients); i++) {
    var recipient = recipients[i];
    runAsync(function() {
        sendEmailAsync(recipient.email, recipient.subject, recipient.body);
    });
}

// Start the SMS sending process asynchronously for each recipient
for (var i = 1; i <= arrayLen(recipients); i++) {
    var recipient = recipients[i];
    runAsync(function() {
        sendSmsAsync(recipient.phone, "SMS message content");
    });
}

// The following code will execute immediately without waiting for the email and SMS sending processes to complete
writeOutput("In main thread...<br>");

</cfscript>

Example 4

In this example, you'll learn to use parallel processing using runAsync, where you'll generate the first 100000 Fibonacci numbers, and also perform a matrix multiplication.

<cfscript>
             //Task 1
             fibonacciTask = runAsync(function(){
                    // Generate first 10000000 Fibonacci numbers
                   fib = [0, 1];
                    for (var i = 3; i < 10000000; i++) {
                        fib[i] = fib[i-1] + fib[i-2];
                    }
                    return fib;
              });
              // Task 2
             matrixMultiplicationTask = runAsync(function(){

                    var matrix1 = [];
                    var matrix2 = [];
                    var result = [];

                    // Generate random matrices (for simplicity, let's assume values are between 1 and 10)
                    for (var i = 1; i <= 200; i++) {
                        matrix1[i] = [];
                        matrix2[i] = [];
                        result[i] = [];
                        for (var j = 1; j <= 200; j++) {
                            matrix1[i][j] = randRange(1, 10);
                            matrix2[i][j] = randRange(1, 10);
                        }
                    }

                    // Multiply matrices
                    for (var i = 1; i <= 200; i++) {
                        for (var j = 1; j <= 200; j++) {
                            result[i][j] = 0;
                            for (var k = 1; k <= 200; k++) {
                                result[i][j] = result[i][j] + matrix1[i][k] * matrix2[k][j];
                            }
                        }
                    }
                    return result;
              });
              //Task 3
             sleepingTask = runAsync(function(){
                    sleep(9000);
              });
             writedump(fibonacciTask.get());
             writedump(matrixMultiplicationTask.get());
             writedump(sleepingTask.get());

</cfscript>

Example 5

In this example, you'll learn to use parallel processing using runAsync, where you'll check if a number is prime, calculate the sum of the prime numbers, and start multiple asynchronous tasks to calculate the sum of prime numbers in parallel.

<cfscript>

// Function to check if a number is prime
function isPrime(num) {
    if (num <= 1) return false;
    if (num <= 3) return true;

    if (num MOD 2 EQ 0 OR num MOD 3 EQ 0) return false;

    var i = 5;
    while (i * i <= num) {
        if (num MOD i EQ 0 OR num MOD (i + 2) EQ 0) return false;
        i = i + 6;
    }

    return true;
}

// Function to calculate the sum of prime numbers
function calculatePrimeSum(start, end) {
    var sum = 0;
    for (var i = start; i <= end; i++) {
        if (isPrime(i)) {
            sum = sum + i;
        }
    }
    return sum;
}

// Define the range for prime number calculation
startRange = 1;
endRange = 10000;

// Start multiple asynchronous tasks to calculate the sum of prime numbers in parallel
task1Id = runAsync(function() {
    result1 = calculatePrimeSum(startRange, 2500);
    return result1;
});

task2Id = runAsync(function() {
    result2 = calculatePrimeSum(2501, 5000);
    return result2;
});

task3Id = runAsync(function() {
    result3 = calculatePrimeSum(5001, 7500);
    return result3;
});

task4Id = runAsync(function() {
    result4 = calculatePrimeSum(7501, endRange);
    return result4;
});

// The following code will execute immediately without waiting for the async tasks to complete
    writeOutput("In main thread...<br>...<br>");
    writeDump(var=task1Id.get(), label="Task 1 ID");
    writeDump(var=task2Id.get(), label="Task 2 ID");
    writeDump(var=task3Id.get(), label="Task 3 ID");
    writeDump(var=task4Id.get(), label="Task 4 ID");
</cfscript>

Output

In main thread...
...
420812 1127324 1749901 2438359

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