JMS – PSS Characteristics (Magic xpi 4.9)
You use PSS messaging when messages can be processed by single or multiple consumers. These are the main characteristics of a PSS messaging domain:
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Each message may have multiple consumers.
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Publishing and subscribing objects have a time dependency. A client that subscribes to a topic can only consume messages published after the client has created a subscription, and the subscriber must continue to be active to consume messages.
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The JMS API relaxes time dependency by allowing clients to create durable subscriptions.