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• Logging Enhancement A new tibemsd parameter has been introduced that allows you to specify the maximum number of log files you want to keep. See the description for logfile_max_count on page 221.
• Delivery Delay Message publishers can now specify a delivery time for messages. The EMS server will only deliver the message after the time delivery time specified when the message is published. For more information, see Delivery Delay.
• Asynchronous Sending Message producers can now send messages asynchronously, offloading the notification of the success or failure to another thread and thereby increasing performance in certain situations. For details, see Sending Messages Synchronously and Asynchronously.
• Shared Subscriptions An application can now share the work of message consumption across multiple topic consumers. When message consumers share a subscription to a topic, only one consumer will receive a published message. For details, see Shared Subscriptions for Topics.
• Simplified API In addition to the API provided with the JMS 1.1 specification, which is now called the Classic API, the JMS 2.0 specification offers a simpler and less verbose API called the Simplified API. For details, see JMS 2.0 Specification.
• Administration Tool Commands and Topic Consumers With this release and the introduction of shared subscriptions, the relationship between topic subscriptions and topic consumers has changed. Most importantly, the number of subscriptions to a topic is not always equal to the number of consumers.
− show topics — now reports the number of subscriptions and durable subscriptions, not the number of consumers.
− show topic — reports the number of subscriptions, durable subscriptions, and consumers. The number of consumers represents the number of active (that is non-closed) consumer objects created by applications. Offline or closed durable consumers are not included in the count.
− Refer to Chapter 6, Using the EMS Administration Tool for details on these commands.
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