It's only a small amount of work but it's not instantaneous, and it has to run concurrently with the main test task. Having noticed that the timer has expired it drops the events sender, which indicates to the receiving end that the channel is closed. A tokio worker thread must be unparked and poll the task which was waiting on that timer. When that internal 4-second timer expires a series of steps must occur. Would this test catch it? Probably… but not necessarily. Imagine our Connection had a bug which caused it to close the channel after only 4 seconds. This test is also slow, weighing in at 5 seconds, but there is a more insidious problem. The receive channel should still be open (but no value)Īssert_eq!(y_recv().unwrap_err(), TryRecvError::Empty) Here we ensure the events channel is still open at 5 seconds: #ĭelay_for(Duration::from_secs(5)).await.unwrap() Your CI runs would take at least 30 minutes, all because of this one test!Ī related challenge is testing for the absence of a timer expiry. Slow tests are a huge hassle for both developers and CI/CD. One problem with this test is that it always takes 11 seconds to execute: 10 seconds to wait for the timeout plus a safety factor. The receive channel should have closedĪssert_eq!(y_recv().unwrap_err(), TryRecvError::Disconnected) We can write a test verifying this: #ĭelay_for(Duration::from_secs(11)).await.unwrap() If there is no activity for 10 seconds it should time out internally and close its events channel.
![anylogic timeout anylogic timeout](https://pic.accessify.com/thumbnails/320x245/c/cloud.anylogic.com.png)
![anylogic timeout anylogic timeout](https://i0.wp.com/softwaredownloadcracked.com/wp-content/uploads/2014/02/qqq42.jpg)
Take a simple example: below we create a hypothetical Connection. It's I/O-heavy, there are numerous peer-to-peer connections synchronizing data concurrently, and we need to use all cores efficiently on low-powered devices like mobile phones.Ī common challenge in async is writing good tests.
Anylogic timeout code#
We were early adopters, using futures and streams in our networking code long before async/await became stable.