DZone
Thanks for visiting DZone today,
Edit Profile
  • Manage Email Subscriptions
  • How to Post to DZone
  • Article Submission Guidelines
Sign Out View Profile
  • Post an Article
  • Manage My Drafts
Over 2 million developers have joined DZone.
Log In / Join
Refcards Trend Reports Events Over 2 million developers have joined DZone. Join Today! Thanks for visiting DZone today,
Edit Profile Manage Email Subscriptions Moderation Admin Console How to Post to DZone Article Submission Guidelines
View Profile
Sign Out
Refcards
Trend Reports
Events
Zones
Culture and Methodologies Agile Career Development Methodologies Team Management
Data Engineering AI/ML Big Data Data Databases IoT
Software Design and Architecture Cloud Architecture Containers Integration Microservices Performance Security
Coding Frameworks Java JavaScript Languages Tools
Testing, Deployment, and Maintenance Deployment DevOps and CI/CD Maintenance Monitoring and Observability Testing, Tools, and Frameworks
Culture and Methodologies
Agile Career Development Methodologies Team Management
Data Engineering
AI/ML Big Data Data Databases IoT
Software Design and Architecture
Cloud Architecture Containers Integration Microservices Performance Security
Coding
Frameworks Java JavaScript Languages Tools
Testing, Deployment, and Maintenance
Deployment DevOps and CI/CD Maintenance Monitoring and Observability Testing, Tools, and Frameworks
  1. DZone
  2. Data Engineering
  3. Databases
  4. EasyNetQ Publisher Confirms

EasyNetQ Publisher Confirms

Mike Hadlow user avatar by
Mike Hadlow
·
Nov. 19, 12 · Interview
Like (0)
Save
Tweet
Share
3.83K Views

Join the DZone community and get the full member experience.

Join For Free

EasyNetQ is my easy-to-use .NET API for RabbitMQ.

The default AMQP publish is not transactional and doesn't guarantee that your message will actually reach the broker. AMQP does specify a transactional publish, but with RabbitMQ it is extremely slow, around 200 slower than a non-transactional publish, and we haven't supported it via the EasyNetQ API. For high-performance guaranteed delivery it's recommended that you use 'Publisher Confirms'. Simply speaking, this an extension to AMQP that provides a call-back when your message has been successfully received by the broker.

What does 'successfully received' mean? It depends ...

  • A transient message is confirmed the moment it is enqueued.
  • A persistent message is confirmed as soon as it is persisted to disk, or when it is consumed on every queue.
  • An unroutable transient message is confirmed directly it is published.

For more information on publisher confirms, please read the announcement on the RabbitMQ blog.

To use publisher confirms, you must first create the publish channel with publisher confirms on:

var channel = bus.OpenPublishChannel(x => x.WithPublisherConfirms())

Next you must specify success and failure callbacks when you publish your message:

channel.Publish(message, x => 
    x.OnSuccess(() =>
    {
        // do success processing here
    })
    .OnFailure(() => 
    {
        // do failure processing here
    }));

Be careful not to dispose the publish channel before your call-backs have had a chance to execute.

Here's an example of a simple test. We're publishing 10,000 messages and then waiting for them all to be acknowledged before disposing the channel. There's a timeout, so if the batch takes longer than 10 seconds we abort with an exception.

const int batchSize = 10000;
var callbackCount = 0;
var stopwatch = new Stopwatch();
stopwatch.Start();

using (var channel = bus.OpenPublishChannel(x => x.WithPublisherConfirms()))
{
    for (int i = 0; i < batchSize; i++)
    {
        var message = new MyMessage {Text = string.Format("Hello Message {0}", i)};
        channel.Publish(message, x => 
            x.OnSuccess(() => {
                callbackCount++;
            })
            .OnFailure(() =>
            {
                callbackCount++;
            }));
    }

    // wait until all the publications have been acknowleged.
    while (callbackCount < batchSize)
    {
        if (stopwatch.Elapsed.Seconds > 10)
        {
            throw new ApplicationException("Aborted batch with timeout");
        }
        Thread.Sleep(10);
    }
}
Transient (computer programming) API Moment Delivery (commerce) Testing .NET IT Blog

Published at DZone with permission of Mike Hadlow, DZone MVB. See the original article here.

Opinions expressed by DZone contributors are their own.

Popular on DZone

  • The Quest for REST
  • How To Use Terraform to Provision an AWS EC2 Instance
  • A Real-Time Supply Chain Control Tower Powered by Kafka
  • How Do the Docker Client and Docker Servers Work?

Comments

Partner Resources

X

ABOUT US

  • About DZone
  • Send feedback
  • Careers
  • Sitemap

ADVERTISE

  • Advertise with DZone

CONTRIBUTE ON DZONE

  • Article Submission Guidelines
  • Become a Contributor
  • Visit the Writers' Zone

LEGAL

  • Terms of Service
  • Privacy Policy

CONTACT US

  • 600 Park Offices Drive
  • Suite 300
  • Durham, NC 27709
  • support@dzone.com
  • +1 (919) 678-0300

Let's be friends: