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Previous Task iteration model suffered from the following shortcomings: - When an iteration was engaged it could be cancelled at await points by Stop or Flush state transitions, which could lead to inconsistent states. - When an iteration was engaged it could not be cancelled by a Pause state transition so as to prevent data loss. This meant we couldn't block on the Pause request because the mechanism couldn't guarantee Paused would be reached in a timely manner. This commit split the Task iteration into: - `try_next`: this function returns a future that awaits for a new iteration to begin. The regular use case is to return an item to process. The item can be left to `()` if `try_next` acts as a tick generator. It can also return an error. This function can be cancelled at await points when a state transition request occurs. - `handle_item`: this function is called with the item returned by `try_next` and is guaranteed to run to completion even if a transition request is received. Note that this model plays well with the common Future cancellation pitfalls in Rust. |
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| examples | ||
| src | ||
| tests | ||
| build.rs | ||
| Cargo.toml | ||
| LICENSE-LGPLv2 | ||