From ba7e09e7782832b1153e3207ef5548aa0eb256ef Mon Sep 17 00:00:00 2001
From: Matthew Mecca <matthew.mecca@gmail.com>
Date: Sat, 23 Feb 2013 19:08:53 -0500
Subject: [PATCH] Bug 757762 - Lightning's alarms too late / internal time is
 wrong. r=philipp

---
 calendar/base/src/calAlarmService.js | 42 ++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/calendar/base/src/calAlarmService.js b/calendar/base/src/calAlarmService.js
index 36e7425dc8..54c792f56a 100644
--- a/calendar/base/src/calAlarmService.js
+++ b/calendar/base/src/calAlarmService.js
@@ -8,6 +8,8 @@ Components.utils.import("resource://gre/modules/Services.jsm");
 Components.utils.import("resource://gre/modules/XPCOMUtils.jsm");
 
 const kHoursBetweenUpdates = 6;
+const kSleepMonitorInterval = 60000;
+const kSleepMonitorTolerance = 1000;
 
 function nowUTC() {
     return cal.jsDateToDateTime(new Date()).getInTimezone(cal.UTC());
@@ -30,6 +32,38 @@ function calAlarmService() {
     this.mTimerMap = {};
     this.mObservers = new calListenerBag(Components.interfaces.calIAlarmServiceObserver);
 
+    this.mSleepMonitor = {
+        service: this,
+        interval: kSleepMonitorInterval,
+        timer: null,
+        expected: null,
+
+        checkExpected: function sm_checkExpected() {
+            let now = Date.now();
+            if (now - this.expected > kSleepMonitorTolerance) {
+                cal.LOG("[calAlarmService] Sleep cycle detected, reloading alarms");
+                this.service.shutdown();
+                this.service.startup();
+            } else {
+                this.expected = now + this.interval;
+            }
+        },
+
+        start: function sm_start() {
+            this.stop();
+            this.expected = Date.now() + this.interval;
+            this.timer = newTimerWithCallback(this.checkExpected.bind(this),
+                                              this.interval, true);
+        },
+
+        stop: function sm_stop() {
+            if (this.timer) {
+                this.timer.cancel();
+                this.timer = null;
+            }
+        }
+    };
+
     this.calendarObserver = {
         alarmService: this,
 
@@ -271,6 +305,12 @@ calAlarmService.prototype = {
 
         this.mUpdateTimer = newTimerWithCallback(timerCallback, kHoursBetweenUpdates * 3600000, true);
 
+        // The sleep monitor needs to be started on platforms that don't support wake_notification
+        if (Services.appinfo.OS != "WINNT" && Services.appinfo.OS != "Darwin") {
+            cal.LOG("[calAlarmService] Starting sleep monitor.");
+            this.mSleepMonitor.start();
+        }
+
         this.mStarted = true;
     },
 
@@ -303,6 +343,8 @@ calAlarmService.prototype = {
         Services.obs.removeObserver(this, "xpcom-shutdown");
         Services.obs.removeObserver(this, "wake_notification");
 
+        this.mSleepMonitor.stop();
+
         this.mStarted = false;
     },