gecko-dev/dom/base/ProcessSelector.js

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JavaScript
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/* 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/. */
ChromeUtils.import("resource://gre/modules/XPCOMUtils.jsm");
ChromeUtils.import('resource://gre/modules/Services.jsm');
// Fills up aProcesses until max and then selects randomly from the available
// ones.
function RandomSelector() {
}
RandomSelector.prototype = {
classID: Components.ID("{c616fcfd-9737-41f1-aa74-cee72a38f91b}"),
QueryInterface: ChromeUtils.generateQI([Ci.nsIContentProcessProvider]),
provideProcess(aType, aOpener, aProcesses, aCount, aMaxCount) {
if (aCount < aMaxCount) {
return Ci.nsIContentProcessProvider.NEW_PROCESS;
}
let startIdx = Math.floor(Math.random() * aMaxCount);
let curIdx = startIdx;
do {
if (aProcesses[curIdx].opener === aOpener) {
return curIdx;
}
curIdx = (curIdx + 1) % aMaxCount;
} while (curIdx !== startIdx);
return Ci.nsIContentProcessProvider.NEW_PROCESS;
},
};
// Fills up aProcesses until max and then selects one from the available
// ones that host the least number of tabs.
function MinTabSelector() {
}
MinTabSelector.prototype = {
classID: Components.ID("{2dc08eaf-6eef-4394-b1df-a3a927c1290b}"),
QueryInterface: ChromeUtils.generateQI([Ci.nsIContentProcessProvider]),
provideProcess(aType, aOpener, aProcesses, aCount, aMaxCount) {
if (aCount < aMaxCount) {
return Ci.nsIContentProcessProvider.NEW_PROCESS;
}
let min = Number.MAX_VALUE;
let candidate = Ci.nsIContentProcessProvider.NEW_PROCESS;
// Note, that at this point aMaxCount is in the valid range and
// the reason for not using aCount here is because if we keep
// processes alive for testing but want a test to use only single
// content process we can just keep relying on dom.ipc.processCount = 1
// this way.
for (let i = 0; i < aMaxCount; i++) {
let process = aProcesses[i];
let tabCount = process.tabCount;
if (process.opener === aOpener && tabCount < min) {
min = tabCount;
candidate = i;
}
}
return candidate;
},
};
var components = [RandomSelector, MinTabSelector];
this.NSGetFactory = XPCOMUtils.generateNSGetFactory(components);