forked from mirrors/gecko-dev
99 lines
3.3 KiB
JavaScript
99 lines
3.3 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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this.EXPORTED_SYMBOLS = ["RunState"];
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const Cu = Components.utils;
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Cu.import("resource://gre/modules/Services.jsm", this);
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const STATE_STOPPED = 0;
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const STATE_RUNNING = 1;
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const STATE_QUITTING = 2;
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const STATE_CLOSING = 3;
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const STATE_CLOSED = 4;
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// We're initially stopped.
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var state = STATE_STOPPED;
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function observer(subj, topic) {
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Services.obs.removeObserver(observer, topic);
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state = STATE_QUITTING;
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}
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// Listen for when the application is quitting.
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Services.obs.addObserver(observer, "quit-application-granted", false);
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/**
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* This module keeps track of SessionStore's current run state. We will
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* always start out at STATE_STOPPED. After the sessionw as read from disk and
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* the initial browser window has loaded we switch to STATE_RUNNING. On the
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* first notice that a browser shutdown was granted we switch to STATE_QUITTING.
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*/
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this.RunState = Object.freeze({
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// If we're stopped then SessionStore hasn't been initialized yet. As soon
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// as the session is read from disk and the initial browser window has loaded
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// the run state will change to STATE_RUNNING.
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get isStopped() {
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return state == STATE_STOPPED;
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},
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// STATE_RUNNING is our default mode of operation that we'll spend most of
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// the time in. After the session was read from disk and the first browser
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// window has loaded we remain running until the browser quits.
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get isRunning() {
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return state == STATE_RUNNING;
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},
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// We will enter STATE_QUITTING as soon as we receive notice that a browser
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// shutdown was granted. SessionStore will use this information to prevent
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// us from collecting partial information while the browser is shutting down
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// as well as to allow a last single write to disk and block all writes after
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// that.
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get isQuitting() {
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return state >= STATE_QUITTING;
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},
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// We will enter STATE_CLOSING as soon as SessionStore is uninitialized.
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// The SessionFile module will know that a last write will happen in this
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// state and it can do some necessary cleanup.
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get isClosing() {
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return state == STATE_CLOSING;
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},
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// We will enter STATE_CLOSED as soon as SessionFile has written to disk for
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// the last time before shutdown and will not accept any further writes.
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get isClosed() {
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return state == STATE_CLOSED;
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},
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// Switch the run state to STATE_RUNNING. This must be called after the
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// session was read from, the initial browser window has loaded and we're
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// now ready to restore session data.
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setRunning() {
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if (this.isStopped) {
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state = STATE_RUNNING;
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}
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},
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// Switch the run state to STATE_CLOSING. This must be called *before* the
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// last SessionFile.write() call so that SessionFile knows we're closing and
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// can do some last cleanups and write a proper sessionstore.js file.
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setClosing() {
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if (this.isQuitting) {
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state = STATE_CLOSING;
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}
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},
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// Switch the run state to STATE_CLOSED. This must be called by SessionFile
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// after the last write to disk was accepted and no further writes will be
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// allowed. Any writes after this stage will cause exceptions.
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setClosed() {
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if (this.isClosing) {
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state = STATE_CLOSED;
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}
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}
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});
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