1. What’s the difference between a FIFO and a standard queue?
FIFO queues have essentially the same features as standard queues, but provide the added benefits of supporting ordering and exactly-once processing and ensure that the order in which messages are sent and received is strictly preserved.
2. How can the server be assured a message was properly received?
By having the client emit a “received” event back to the server upon receipt of the message
What classic design pattern is best represented by event driven programming?
The observer pattern is a software design pattern in which an object, named the subject, maintains a list of its dependents, called observers, and notifies them automatically of any state changes, usually by calling one of their methods
How do you test an event driven system?
There are multiple levels of tests you will typically write for your system. In the most canonical case, you will write unit tests, service tests, and end-to-end tests. In each of these cases, your System Under Test (SUT, what is actually being tested) comprises a different part of your application.
Terms:
FIFO Queue FIFO is an abbreviation for first in, first out. It is a method for handling data structures where the first element is processed first and the newest element is processed last Pub/Sub Pub/Sub allows services to communicate asynchronously, with latencies on the order of 100 milliseconds.
Q: What is Amazon Simple Notification Service (Amazon SNS)?
Amazon Simple Notification Service (Amazon SNS) is a web service that makes it easy to set up, operate, and send notifications from the cloud. It provides developers with a highly scalable, flexible, and cost-effective capability to publish messages from an application and immediately deliver them to subscribers or other applications.
Q: How can I get started using Amazon SNS?
You can create an Amazon SNS topic and publish messages in a few steps by completing our 10-minute tutorial, Send Fanout Notifications. For additional detail, see the Amazon SNS Developer Guide, and sample code in the Resource Center.
SQS
Amazon Simple Queue Service (SQS) is a fully managed message queuing service that enables you to decouple and scale microservices, distributed systems, and serverless applications. SQS eliminates the complexity and overhead associated with managing and operating message-oriented middleware, and empowers developers to focus on differentiating work.