Question 1

How to schedule a task to run every hour with delay-timer?

Accepted Answer

Use the `set_frequency_repeated_by_cron_str` method with a cron expression like '0 * * * *' or the shorthand '@hourly' when building a task with `TaskBuilder`. This allows precise hourly execution similar to traditional cron jobs.

Question 2

delay-timer vs tokio's interval for periodic tasks?

Accepted Answer

delay-timer offers more features like dynamic task management, cron-like scheduling, and parallelism control, while tokio's interval is simpler but limited to fixed intervals without runtime modifications. Choose delay-timer for complex scheduling needs.

Question 3

How to handle errors and retries in delay-timer tasks?

Accepted Answer

Error handling must be implemented within the task closure itself; delay-timer does not provide built-in retry mechanisms. Developers need to manage failures manually, such as using try-catch blocks in async tasks or logging errors for debugging.

Question 4

Can I use delay-timer in a synchronous Rust app without async runtime?

Accepted Answer

Yes, delay-timer supports synchronous tasks via `spawn_routine`, but for asynchronous tasks, an async runtime like smol or tokio is required. The builder allows configuration without default runtimes if only synchronous execution is needed.

Question 5

What is the performance overhead of using delay-timer?

Accepted Answer

Based on the time wheel algorithm, it's efficient for managing many timed tasks, but overhead depends on task frequency and parallelism settings. The README notes benchmarks as a to-do item, so actual performance may vary and require testing.

Question 6

How to monitor the status of scheduled tasks in delay-timer?

Accepted Answer

Monitoring is limited; developers can use task handles to check instances, but built-in dashboards or detailed logs are not provided. Implementing custom logging within tasks or external tools is recommended for production monitoring.

delay-timer

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