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Re: Data Channel Buffer Management Proposal

From: Peter Thatcher <pthatcher@google.com>
Date: Mon, 18 May 2015 11:53:38 -0700
Message-ID: <CAJrXDUEiitovdmsL=cjVnRfWvxns1P8moCgLnaS2nB+fppYKmw@mail.gmail.com>
To: Benjamin Schwartz <bemasc@google.com>
Cc: "public-webrtc@w3.org" <public-webrtc@w3.org>
Would the JS need to call waitForBufferedAmountBelow again each time the
Promise is fired?  It's too bad we don't have promises that can fire
multiple times.

Other than the need to have this be called many times, and the possible
performance consequences of that, I like this API.

On Mon, May 18, 2015 at 11:43 AM, Benjamin Schwartz <bemasc@google.com>

> Right now, the data channel specification allows the sender to check the
> amount of pending outbound data using the ".bufferedAmount" property.  In
> fact, senders are effectively required to check this value when sending
> large amounts, to avoid queueing up too much data in memory.  However, if
> the sender does need to wait for bufferedAmount to decrease, it must use
> timer-based polling to determine when bufferedAmount has decreased, and it
> is safe to send again.
> To remove the need for polling, I propose the following addition to the
> RTCDataChannel API:
> Promise<void> waitForBufferedAmountBelow (unsigned long amount);
> This method returns a Promise that resolves when this.bufferedAmount <=
> amount, or rejects if the channel reaches the "closed" state.
> --Ben
> P.S.  This issue has also been discussed at
> https://code.google.com/p/webrtc/issues/detail?id=4613
Received on Monday, 18 May 2015 18:54:46 UTC

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