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Re: [sensors] Use simple event dispatch mechanism instead of task source (queued)

From: Alexander Shalamov via GitHub <sysbot+gh@w3.org>
Date: Fri, 26 May 2017 18:11:56 +0000
To: public-device-apis-log@w3.org
Message-ID: <issue_comment.created-304352364-1495822315-sysbot+gh@w3.org>
> Could you point me to where in the spec this is fixed. I fail to see how anything in that PR fixes it (which doesn't mean it's not fixed, just I fail to see it).

Sure, [report latest reading updated](https://github.com/w3c/sensors/pull/210/files#diff-ec9cfa5f3f35ec1f84feb2e59686c34dR1248) algorithm and [update sensor reading](https://github.com/w3c/sensors/pull/210/files#diff-ec9cfa5f3f35ec1f84feb2e59686c34dR1279) that makes deep copy of latest reading to Sensor.reading, therefore, Sensor.reading is not pointing directly to internal shared buffer (latest reading), thus, modification of latest reading in the middle of script execution would not modify Sensor.reading.

- Sensor.reading === Sensor.reading during event handler execution
- SensorA with different frequency would not modify SensorB behavior
- Reporting frequency is respected, e.g., Sensor.reading is not updated faster than requested.

> Yeah—I know. The backstory is that I added @anssiko's work in there to meet a deadline, knowing very well we'd have to tackle the task issue heads on at some point. Hence the inline issue on the topic I added later. Technical debt.

Technical debt is fine, as long as we are taking care of it. Thanks for involving #whatwg and asking for hints!

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Received on Friday, 26 May 2017 18:12:03 UTC

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