diff options
Diffstat (limited to 'tools/addon-sdk-1.12/lib/sdk/system/unload.js')
-rw-r--r-- | tools/addon-sdk-1.12/lib/sdk/system/unload.js | 82 |
1 files changed, 0 insertions, 82 deletions
diff --git a/tools/addon-sdk-1.12/lib/sdk/system/unload.js b/tools/addon-sdk-1.12/lib/sdk/system/unload.js deleted file mode 100644 index 4d2575b..0000000 --- a/tools/addon-sdk-1.12/lib/sdk/system/unload.js +++ /dev/null @@ -1,82 +0,0 @@ -/* 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/. */ - -// Parts of this module were taken from narwhal: -// -// http://narwhaljs.org - -module.metadata = { - "stability": "experimental" -}; - -const { on, off } = require('./events'); -const unloadSubject = require('@loader/unload'); - -const observers = []; -const unloaders = []; - -var when = exports.when = function when(observer) { - if (observers.indexOf(observer) != -1) - return; - observers.unshift(observer); -}; - -var ensure = exports.ensure = function ensure(obj, destructorName) { - if (!destructorName) - destructorName = "unload"; - if (!(destructorName in obj)) - throw new Error("object has no '" + destructorName + "' property"); - - let called = false; - let originalDestructor = obj[destructorName]; - - function unloadWrapper(reason) { - if (!called) { - called = true; - let index = unloaders.indexOf(unloadWrapper); - if (index == -1) - throw new Error("internal error: unloader not found"); - unloaders.splice(index, 1); - originalDestructor.call(obj, reason); - originalDestructor = null; - destructorName = null; - obj = null; - } - }; - - // TODO: Find out why the order is inverted here. It seems that - // it may be causing issues! - unloaders.push(unloadWrapper); - - obj[destructorName] = unloadWrapper; -}; - -function unload(reason) { - observers.forEach(function(observer) { - try { - observer(reason); - } - catch (error) { - console.exception(error); - } - }); -} - -when(function(reason) { - unloaders.slice().forEach(function(unloadWrapper) { - unloadWrapper(reason); - }); -}); - -on('sdk:loader:destroy', function onunload({ subject, data: reason }) { - // If this loader is unload then `subject.wrappedJSObject` will be - // `destructor`. - if (subject.wrappedJSObject === unloadSubject) { - off('sdk:loader:destroy', onunload); - unload(reason); - } -// Note that we use strong reference to listener here to make sure it's not -// GC-ed, which may happen otherwise since nothing keeps reference to `onunolad` -// function. -}, true); |