Redis in Action by Josiah L. Carlson

Author:Josiah L. Carlson [Unknown]
Language: eng
Format: epub, pdf
Publisher: Manning Publications

There are a few different ways that we could potentially add delays to our queue items. Here are the three most straightforward ones:

We could include an execution time as part of queue items, and if a worker process sees an item with an execution time later than now, it can wait for a brief period and then re-enqueue the item.

The worker process could have a local waiting list for any items it has seen that need to be executed in the future, and every time it makes a pass through its while loop, it could check that list for any outstanding items that need to be executed.

Normally when we talk about times, we usually start talking about ZSETs. What if, for any item we wanted to execute in the future, we added it to a ZSET instead of a LIST, with its score being the time when we want it to execute? We then have a process that checks for items that should be executed now, and if there are any, the process removes it from the ZSET, adding it to the proper LIST queue.

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