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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/. */
"use strict";
this.EXPORTED_SYMBOLS = ["RunState"];
const STATE_STOPPED = 0;
const STATE_RUNNING = 1;
const STATE_QUITTING = 2;
const STATE_CLOSING = 3;
const STATE_CLOSED = 4;
// We're initially stopped.
var state = STATE_STOPPED;
/**
* This module keeps track of SessionStore's current run state. We will
* always start out at STATE_STOPPED. After the session was read from disk and
* the initial browser window has loaded we switch to STATE_RUNNING. On the
* first notice that a browser shutdown was granted we switch to STATE_QUITTING.
*/
this.RunState = Object.freeze({
// If we're stopped then SessionStore hasn't been initialized yet. As soon
// as the session is read from disk and the initial browser window has loaded
// the run state will change to STATE_RUNNING.
get isStopped() {
return state == STATE_STOPPED;
},
// STATE_RUNNING is our default mode of operation that we'll spend most of
// the time in. After the session was read from disk and the first browser
// window has loaded we remain running until the browser quits.
get isRunning() {
return state == STATE_RUNNING;
},
// We will enter STATE_QUITTING as soon as we receive notice that a browser
// shutdown was granted. SessionStore will use this information to prevent
// us from collecting partial information while the browser is shutting down
// as well as to allow a last single write to disk and block all writes after
// that.
get isQuitting() {
return state >= STATE_QUITTING;
},
// We will enter STATE_CLOSING as soon as SessionStore is uninitialized.
// The SessionFile module will know that a last write will happen in this
// state and it can do some necessary cleanup.
get isClosing() {
return state == STATE_CLOSING;
},
// We will enter STATE_CLOSED as soon as SessionFile has written to disk for
// the last time before shutdown and will not accept any further writes.
get isClosed() {
return state == STATE_CLOSED;
},
// Switch the run state to STATE_RUNNING. This must be called after the
// session was read from, the initial browser window has loaded and we're
// now ready to restore session data.
setRunning() {
if (this.isStopped) {
state = STATE_RUNNING;
}
},
// Switch the run state to STATE_CLOSING. This must be called *before* the
// last SessionFile.write() call so that SessionFile knows we're closing and
// can do some last cleanups and write a proper sessionstore.js file.
setClosing() {
if (this.isQuitting) {
state = STATE_CLOSING;
}
},
// Switch the run state to STATE_CLOSED. This must be called by SessionFile
// after the last write to disk was accepted and no further writes will be
// allowed. Any writes after this stage will cause exceptions.
setClosed() {
if (this.isClosing) {
state = STATE_CLOSED;
}
},
// Switch the run state to STATE_QUITTING. This should be called once we're
// certain that the browser is going away and before we start collecting the
// final window states to save in the session file.
setQuitting() {
if (this.isRunning) {
state = STATE_QUITTING;
}
},
});
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