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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-21 11:44:51 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-21 11:44:51 +0000 |
| commit | 9e3c08db40b8916968b9f30096c7be3f00ce9647 (patch) | |
| tree | a68f146d7fa01f0134297619fbe7e33db084e0aa /netwerk/base/nsIClassOfService.idl | |
| parent | Initial commit. (diff) | |
| download | thunderbird-upstream.tar.xz thunderbird-upstream.zip | |
Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'netwerk/base/nsIClassOfService.idl')
| -rw-r--r-- | netwerk/base/nsIClassOfService.idl | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/netwerk/base/nsIClassOfService.idl b/netwerk/base/nsIClassOfService.idl new file mode 100644 index 0000000000..5426eabbcc --- /dev/null +++ b/netwerk/base/nsIClassOfService.idl @@ -0,0 +1,103 @@ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#include "nsISupports.idl" + +/** + * nsIClassOfService.idl + * + * Used to express class dependencies and characteristics - complimentary to + * nsISupportsPriority which is used to express weight + * + * Channels that implement this interface may make use of this + * information in different ways. + */ + +// convenience class for passing around the class of service +%{C++ +namespace mozilla::net { +class ClassOfService; +} +%} +native ClassOfService(mozilla::net::ClassOfService); + +[scriptable, uuid(1ccb58ec-5e07-4cf9-a30d-ac5490d23b41)] +interface nsIClassOfService : nsISupports +{ + attribute unsigned long classFlags; + attribute bool incremental; + + void clearClassFlags(in unsigned long flags); + void addClassFlags(in unsigned long flags); + void setClassOfService(in ClassOfService s); + + // All these flags have a (de)prioritization effect. + + // In the HTTP/1 world the priority is considered for all requests inside a so + // called 'Request Context' which is a context common to all sub-resources + // belonging to a single top level window (RequestContextService). Requests + // marked with the Leader flag are blocking (preventing from being sent to the + // server) all other resource loads except those marked with the Unblocked + // flag. Other classes run in parallel - neither being blocked no ;r blocking. + // The Leader flag is used only for <head> blocking resources (sync and + // defer javascript resources and stylesheets.) Purpose is to deliver these + // first-paint and domcontentloaded blocking resources as soon as possbile. + + // In the HTTP/2 world it's different. Priorities are done only per HTTP/2 + // session, normally we have one session per one origin (including origin + // attributes!) Requests are dispatched (sent) immediately on an HTTP/2 + // session. Each session has artificial streams (groups) relating to the class + // of service flags (Leader, Other, Background, Speculative, Follower, + // UrgentStart), each such a stream is given a different weight (only way to + // give a stream a priority in HTTP/2) reflecting the desired request group + // priority. Actual request streams are then dependent on these artificial + // streams (groups). nsISupportsPriority of each request is passed as a weight + // on the HTTP/2 stream to prioritize streams in the same group. A stream can + // also be dependent on other stream. We have dependency of Followers on + // Leaders, hence everything set the Follower flag should be processed by the + // server after Leaders. Same for Speculative being dependent on Background. The + // tree is created and used here: + // https://searchfox.org/mozilla-central/rev/cc280c4be94ff8cf64a27cc9b3d6831ffa49fa45/netwerk/protocol/http/Http2Session.cpp#1053-1070 + // https://searchfox.org/mozilla-central/rev/cc280c4be94ff8cf64a27cc9b3d6831ffa49fa45/netwerk/protocol/http/Http2Stream.cpp#1338 + // For detailed description of how HTTP/2 server should handle the priorities + // and dependencies see: + // https://developers.google.com/web/fundamentals/performance/http2/#stream_prioritization + // Please note that the dependecies and weights we are sending to the server + // are only suggestions, the server may completely ignore it. + + // Leaders (should) block all other resources except Unblocked. This flag + // also priortizes HTTP cache reading queue by blocking all other cache + // requests. + const unsigned long Leader = 1 << 0; + // The Follower flag is currently unused! + const unsigned long Follower = 1 << 1; + // The Speculative flag is currently unused! + const unsigned long Speculative = 1 << 2; + // The Background flag is currently only used for Beacon. + const unsigned long Background = 1 << 3; + // Requests marked with this flag are not blocked by Leaders. This is mainly + // used for probing-like XMLHttpRequests that may block delivery of head + // blocking resources, e.g. CSS files tailored for the UA. + const unsigned long Unblocked = 1 << 4; + // Throttleable flag allows response throttling of the resource load. Note + // that this functionality is currently disabled. + const unsigned long Throttleable = 1 << 5; + // UrgentStart makes the request temporarily extend HTTP/1 connection + // parallelism limits. Used mainly for navigational requests (top level html) + // and any request considered coming from a user interaction to make reaction + // of the browser as fast as possible and not blocked. + const unsigned long UrgentStart = 1 << 6; + // Specifically disables throttling under any circumstances, used for media + // responses mainly. + const unsigned long DontThrottle = 1 << 7; + // Enforce tailing on this load; any of Leader, Unblocked, UrgentStart, + // TailForbidden overrule this flag (disable tailing.) + const unsigned long Tail = 1 << 8; + // Tailing may be engaged regardless if the load is marked Unblocked when some + // other conditions are met later, like when the load is found to be a + // tracker. + const unsigned long TailAllowed = 1 << 9; + // Tailing not allowed under any circumstances or combination of flags. + const unsigned long TailForbidden = 1 << 10; +}; |