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Can you give an example where the queue data structure can be particularly useful

Can you give an example where the data structure of a queue can be particularly useful.

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Queues are most often used to schedule and process requests.

For example, everything where you have one process that creates requests and another process that processes requests that you would use to store requests.

Usually the queue is in FIFO order - requests are processed in the order in which they are received, but they can also be ordered in other ways (for example, priority queue).

A few examples:

  • An operating system that schedules threads to run on the CPU will use a queue to determine which thread will run.

  • A web server that processes HTTP requests will use the queue to send requests to streams that will actually serve web pages.

  • Processing print requests for print jobs. A.

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In case you need to process requests in the order in which they were received, you will use the queue. Or a FIFO type structure ... first at the beginning ... which stores the request order. To do this further, you can use a standalone queue similar to MSMQ to disconnect the request from the actual request. Say you have a website that needs to send emails. This is an ideal place for a queue where a site delays a request in a queue for a stand-alone processor, so the website is not directly tied to the SMTP server that is needed to process mail. This then frees up the workflow on the website for processing web requests.

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Turn

has many uses in algorithms, such as wide search in width . and it is very useful.

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In some cases, items can (safely) be pushed and pulled from the queue structure by multiple threads. For example, let's say you want only 5 simultaneous connections to a credit card processor. You can start 5 threads and check (wait) for items to appear in the queue. Credit card processing requests are placed in this queue structure by other threads, which will be processed as soon as possible. (This is simplified. There are many other considerations, such as waiting for a response, thread safety, concurrency, locking, developer mood, moon phase ...)

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