Contents
How is message reliability guaranteed streaming?
For clients subscribed with API version 37.0 or later, Streaming API provides reliable message delivery by enabling you to replay past events through durable streaming. Durable streaming is supported when clients subscribe at the Streaming API endpoint using API version 37.0 or later.
What are streaming API?
Streaming API enables streaming of events using push technology and provides a subscription mechanism for receiving events in near real time. The Streaming API subscription mechanism supports multiple types of events, including PushTopic events, generic events, platform events, and Change Data Capture events.
How does Salesforce streaming API perform long polling?
The Streaming API uses a publisher-subscriber (pub/sub) model to push data to the client. This is done using a push protocol called the Bayeux protocol. The Salesforce implementation uses long polling connections to the server that will be able to notify the client on changes.
What is reliable message delivery?
A reliable message delivery system uses a protocol and/or a reliable transport mechanism and depending on its scope, it retransmits messages which failed (for a few times) to arrive or even persists messages between sessions/restarts.
What is the need of reliable messaging?
Reliable is defined as the ability to guarantee message delivery between the two Web Services. It ensures that messages are delivered reliably between distributed applications regardless of software component, system, or network failures.
When to use durable streaming in Salesforce App?
Durable streaming is supported when clients subscribe at the Streaming API endpoint using API version 37.0 or later. The PushTopic or platform event version affects only the fields available in the event message, but doesn’t affect the client subscription version.
How does auto acknowledgement work in JMS server?
In Auto Acknowledgement model for each message session it automatically acknowledges whether the client has received the message or not. It is important to see what are the scenarios that can have reliability issues with auto-acknowledgement mode. Usually, message receipt can be done in two ways – synchronously and asynchronously.
When does acknowledgement of a message take place?
Usually, message receipt can be done in two ways – synchronously and asynchronously. In these two different models, the acknowledgement happens at different times and bring different results. Synchronous: acknowledgement happens just before the call to a message consumer’s “receive” or “receiveNoWait” method returns a message.
These acknowledgement modes are JMS provider specific, and therefore, they compromise the JMS application portability. A transacted session is a related group of consumed or produced messages that is treated as a single unit of work. A transaction, as it generally means, can either be committed or rollback.