I'm confused as to how to send JSON data back from a webworker to the main thread via an Array Buffer.
suppose:
data = {"key":"value"}
worker.postMessage(data, buffers);
what exactly am I supposed to put in for buffers?
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Can you clarify what you mean to send it "via" an array buffer, and why you want to do that?.Michal Charemza– Michal Charemza2015-05-17 10:06:02 +00:00Commented May 17, 2015 at 10:06
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please see here: html5rocks.com/en/tutorials/workers/basics and here updates.html5rocks.com/2011/12/…vgoklani– vgoklani2015-05-17 14:19:52 +00:00Commented May 17, 2015 at 14:19
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You have an JSON object in a web worker, and would like to transfer (not copy) it to the main thread?Michal Charemza– Michal Charemza2015-05-17 14:28:57 +00:00Commented May 17, 2015 at 14:28
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yes exactly, i'm not sure of the exact argument in the postMessage()vgoklani– vgoklani2015-05-17 15:02:10 +00:00Commented May 17, 2015 at 15:02
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I suspect that some copying may be unavoidable: according to developer.mozilla.org/en-US/docs/Web/API/Transferable you can only transfer ArrayBuffer and MessagePort objects. You could potentially "pack" a JSON object into an ArrayBuffer, using something like github.com/theangryangel/jspack-arraybuffer, but I suspect it'll be more efficient to just copy the JSON object between the threads, rather than copy/pack it into an ArrayBuffer to then transfer.Michal Charemza– Michal Charemza2015-05-17 15:07:55 +00:00Commented May 17, 2015 at 15:07
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1 Answer
.postMessage accepts a message identifier and the message data like this:
var message_data = {'key':'val'};
worker.postMessage('my_message', message_data);
message identifier in a sense signifies the type of message or event sent, then the data are the actual message data or parameters, which can include any JS transferable type (including Typed Arrays)
