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Despite its name, the `queue_size` method does not return the number of items in the queue; it returns the number of items that the local consumer has delivered but unprocessed. These are often, but not always, the same. RabbitMQ's queues maintain the queue of unacknowledged messages; when a consumer connects, it sends to the consumer some number of messages to handle, known as the "prefetch." This is a performance optimization, to ensure the consumer code does not need to wait for a network round-trip before having new data to consume. The default prefetch is 0, which means that RabbitMQ immediately dumps all outstanding messages to the consumer, which slowly processes and acknowledges them. If a second consumer were to connect to the same queue, they would receive no messages to process, as the first consumer has already been allocated them. If the first consumer disconnects or crashes, all prior events sent to it are then made available for other consumers on the queue. The consumer does not know the total size of the queue -- merely how many messages it has been handed. No change is made to the prefetch here; however, future changes may wish to limit the prefetch, either for memory-saving, or to allow multiple consumers to work the same queue. Rename the method to make clear that it only contains information about the local queue in the consumer, not the full RabbitMQ queue. Also include the waiting message count, which is used by the `consume()` iterator for similar purpose to the pending events list. |
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README.md
Zulip overview
Zulip is a powerful, open source group chat application that combines the immediacy of real-time chat with the productivity benefits of threaded conversations. Zulip is used by open source projects, Fortune 500 companies, large standards bodies, and others who need a real-time chat system that allows users to easily process hundreds or thousands of messages a day. With over 500 contributors merging over 500 commits a month, Zulip is also the largest and fastest growing open source group chat project.
Getting started
Click on the appropriate link below. If nothing seems to apply, join us on the Zulip community server and tell us what's up!
You might be interested in:
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Contributing code. Check out our guide for new contributors to get started. Zulip prides itself on maintaining a clean and well-tested codebase, and a stock of hundreds of beginner-friendly issues.
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Contributing non-code. Report an issue, translate Zulip into your language, write for the Zulip blog, or give us feedback. We would love to hear from you, even if you're just trying the product out.
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Supporting Zulip. Advocate for your organization to use Zulip, write a review in the mobile app stores, or upvote Zulip on product comparison sites.
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Checking Zulip out. The best way to see Zulip in action is to drop by the Zulip community server. We also recommend reading Zulip for open source, Zulip for companies, or Zulip for working groups and part time communities.
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Running a Zulip server. Use a preconfigured DigitalOcean droplet, install Zulip directly, or use Zulip's experimental Docker image. Commercial support is available; see https://zulip.com/plans for details.
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Using Zulip without setting up a server. https://zulip.com offers free and commercial hosting, including providing our paid plan for free to fellow open source projects.
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Participating in outreach programs like Google Summer of Code.
You may also be interested in reading our blog or following us on Twitter. Zulip is distributed under the Apache 2.0 license.