Cloud Messaging Services

-

AWS & Azure Messaging Services

Messaging services enable disparate systems to communicate and exchange information. AWS and Azure both provide highly available and reliable services to build real-time and non-real time event driven architectures.

Event driven architectures use events (small messages) to invoke a service and pass information between systems in near real time. Typical components in a EDA are event producers/publishers, event routers and event consumers/subscribers. 

All  the services push messages (or at least support) to consumers in near real-time automatically. Consumers need not poll anymore, which introduces latency, consumes CPU cycles, etc. In some cases you might want to poll for messages when you don't want to handle messages in real-time or have downstream systems that don't scale well.

Amazon MQ:

Is an enterprise grade fully managed service to run Apache Active MQ or Rabbit MQ message brokers. It provides all the features of the underlying message broker you would need to build a robust system. 

This service can push messages to Amazon Lambda or consumers can poll for messages.

Azure has a similar service called Azure Service Bus.

Amazon SQS:

Is an elastically scalable managed message queuing service to store messages until processed by consumers. It integrates with AWS Lambda to push messages. 
Azure offers storage queues which is same as AWS SQS Standard and Service Bus queues which is similar to AWS SQS FIFO.

Amazon SNS:

SNS is fully managed push based pub/sub service based on topics. SNS service pushes messages to consumers (Http, Lambda, SQS, mobile devices etc.). SNS supports Standard and FIFO topics. The messages have to be small (256KB)  and there's no guarantee on order and they can be delivered more than once. They messages are not stored and disappear if there are no subscribers. But you can setup dead-letter-queue (DLQ) to capture undelivered messages. FIFO type maintains order and supports exactly once delivery but is expensive.

Azure has something similar called Azure Notifications Hub but its designed for mobile. 

Amazon EventBridge: 

Is a fully managed push based pub/sub service that routes real-time events from producers to consumers based on rules defined. You can only define up to 5 targets for each rule. They don't guarantee order and delivery count. If an event does not match any rules it disappears unless you setup AWS DLQ (SQS). 

Azure's similar offering is Azure Event Grid service.

Comments

Post a Comment

Popular posts from this blog

Offline Apps Patterns and Tools

-
Apps capable of running offline provide a great user experience even when there's slow/unreliable or no network/internet available. They also minimize data usage and save battery power when run on mobile devices. Design Considerations: Upfront, both front and back end must be designed to work offline.  Think about features that cannot work in offline mode. Single users using the app on multiple devices. Automatically sync data (uni/bi-directional) stored locally on the device with the central database once the app is able to connect to the internet.  If the app is allowed to be used from multiple devices, conflicting data changes made by users and any data sync conflicts need to be handled. To make UI work offline, in the case of Mobile applications, there's nothing to do, but web applications will have to use something called service workers. By implementing a service worker, you can turn a regular web application into a Progressive Web App, making it downloadable and install...
Read more

Private Cloud Platforms

-
The below services let you   take public cloud infrastructure, private data centers or mix both to build a private cloud on-prem. AWS Outposts and Azure Stack are quite similar in that they essentially take public cloud computing services and extend them into on-premises data centers.  Using these frameworks, services available in public clouds like AWS EC2 , or Azure Virtual Machines can be run on on-premises data centers. You can also use the same monitoring and management tools that you would in the public cloud. Azure Stack Hub Azure Stack Hub brings core cloud services to customers' data centers, like virtual machines, storage, networking, VPN gateway and load balancing, as well as services like functions, containers and database. Certified hardware can be purchased from  a variety of partner vendors, such as HPE, Dell EMC, Cisco, Huawei and Lenovo.   Users need to manage their infrastructure, but professional support from Microsoft is available as part of the p...
Read more

Application Delivery in the cloud

-
Traditional load balancers have lately evolved to become intelligent application delivery controllers (ADC) which implement various techniques to improve performance along with balancing load across a group of backend servers. Some of the techniques include caching content, compression of assets (js files, images etc.), taking over SSL related process from web servers, providing security from DDoS, SQL injection, XSS etc.. ADCs are like one-stop-shop for providing performance and security.  Load balancers for non-HTTP(s) workloads: Azure Traffic Manager: Is a global non-HTTP(s)/DNS load balancer. DNS load balancers provide IP address of an healthy endpoint based on the configured rules. The endpoint can be an application gateway or a load balancer depending on whether SSL offloading or application layer processing is required or not. Azure Load Balancer: is a non-HTTP(s) global (cross-region)  load balancer (aka network load balancer) operates at layer 4 (transport laye...
Read more