Symbian3/PDK/Source/GUID-579EF7F5-EA93-40D1-917F-95B966D1BAB2.dita
author Dominic Pinkman <dominic.pinkman@nokia.com>
Fri, 13 Aug 2010 16:47:46 +0100
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permissions -rw-r--r--
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
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<?xml version="1.0" encoding="utf-8"?>
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
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<!-- This component and the accompanying materials are made available under the terms of the License 
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"Eclipse Public License v1.0" which accompanies this distribution, 
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
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<!-- Initial Contributors:
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    Nokia Corporation - initial contribution.
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Contributors: 
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-->
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<!DOCTYPE concept
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  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
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<concept id="GUID-579EF7F5-EA93-40D1-917F-95B966D1BAB2" xml:lang="en"><title>Working
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with Skipped Calendar Alarms - Overview</title><shortdesc>This topic introduces a set of tutorials on working with Calendar
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alarms that have been skipped because of environment changes. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
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<section id="GUID-D75C3FEA-664E-4526-872E-BFC73BAF6F64">       <title>Required background</title>       <p>Familiarity with:</p><ul>
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<li><p><xref href="GUID-00631ED2-1B7F-5FC4-9E81-4B6DF7946631.dita">Calendar</xref> and <xref href="GUID-114D4F3F-9358-5B50-94DC-45CCBA783DF4.dita">Alarm Server</xref> functionality.</p></li>
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<li><p>Skipped Alarms property keys in the <xref href="GUID-8FAC10FB-BCD1-3373-9440-EF2EED70A861.dita"><apiname>TASShdAlarm</apiname></xref> class.</p></li>
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<li><p><xref href="GUID-C705B0D5-055A-5DAA-9C6E-2FC3519FA50C.dita">Publish and
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Subscribe</xref>. </p></li>
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</ul>     </section>
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<section id="GUID-7A034BBB-52F3-4AFA-B40E-26B563491255">       <title>Introduction</title>       <p> A skipped alarm is a
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Calendar alarm which does not expire normally because of an environment change.
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An environment change can put the alarm’s expiry time in the past. </p><p> An
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environment change is one of the following: </p><ul>
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<li><p>A system time change. </p></li>
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<li><p>A time zone change. This is similar to a Coordinated Universal Time
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(UTC) change. </p></li>
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<li><p>A Daylight Savings Time (DST) observation period beginning or ending.
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(Similar to a UTC change.) </p></li>
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</ul><p> Each Calendar instance has a <xref href="GUID-725D11A2-8805-3466-98DB-EF5CDEAF2801.dita"><apiname>CCalEntry</apiname></xref>. When the <codeph>CCalEntry</codeph> has
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an associated <xref href="GUID-211D3640-9862-3F78-98FC-9793578117A9.dita"><apiname>CCalAlarm</apiname></xref>  it becomes an alarmed Calendar
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instance. </p><p> When an environment change occurs the Alarm Server can respond
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to the skipped alarms in one of two ways: </p><p> <i>Queue an alarm which
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then expires</i></p><p>The Alarm Server notifies Calendar that the system
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date/time has changed. Calendar then queues alarms that would have been skipped
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up to a day in the past with the Alarm Server. These alarms then expire immediately
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and the device user must acknowledge each of them. </p><p><i>Notify a subscriber
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about the skipped alarm</i></p><p> The Alarm Server uses Publish and Subscribe
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to notify a subscriber that one or more Calendar alarms has been skipped.
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The subscriber decides what action to take because Calendar does not queue
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skipped alarms with the Alarm Server. </p><p>To learn how a subscriber can
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be notified of skipped Calendar alarms and respond to them see the tasks below.</p> 
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   </section>
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<section id="GUID-95A0061F-EFAC-44FB-93C1-7D6BDB6C8A25">       <title>Tasks</title><ul>
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<li><p><xref href="GUID-CA933F35-7508-5C98-9DB6-2492803A2183.dita">Reading a Skipped
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Alarm Property</xref></p></li>
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<li><p><xref href="GUID-BF8C56B7-1F39-502F-B9CA-81E9272CC945.dita">Reading a Skipped
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Alarm Instances Property</xref></p></li>
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<li><p><xref href="GUID-E3981A14-DD2C-5582-A250-C2AD358729FD.dita">Retrieving Skipped
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Alarmed Calendar Instances</xref></p></li>
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</ul>           </section>
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</conbody></concept>