Symbian3/PDK/Source/GUID-C705B0D5-055A-5DAA-9C6E-2FC3519FA50C.dita
author Dominic Pinkman <Dominic.Pinkman@Nokia.com>
Thu, 11 Mar 2010 18:02:22 +0000
changeset 3 46218c8b8afa
parent 1 25a17d01db0c
child 5 f345bda72bc4
permissions -rw-r--r--
week 10 bug fix submission (SF PDK version): Bug 1892, Bug 1897, Bug 1319. Also 3 or 4 documents were found to contain code blocks with SFL, which has been fixed. Partial fix for broken links, links to Forum Nokia, and the 'Symbian platform' terminology issues.
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46218c8b8afa week 10 bug fix submission (SF PDK version): Bug 1892, Bug 1897, Bug 1319. Also 3 or 4 documents were found to contain code blocks with SFL, which has been fixed. Partial fix for broken links, links to Forum Nokia, and the 'Symbian platform' terminology issues.
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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:
46218c8b8afa week 10 bug fix submission (SF PDK version): Bug 1892, Bug 1897, Bug 1319. Also 3 or 4 documents were found to contain code blocks with SFL, which has been fixed. Partial fix for broken links, links to Forum Nokia, and the 'Symbian platform' terminology issues.
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    Nokia Corporation - initial contribution.
46218c8b8afa week 10 bug fix submission (SF PDK version): Bug 1892, Bug 1897, Bug 1319. Also 3 or 4 documents were found to contain code blocks with SFL, which has been fixed. Partial fix for broken links, links to Forum Nokia, and the 'Symbian platform' terminology issues.
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Contributors: 
46218c8b8afa week 10 bug fix submission (SF PDK version): Bug 1892, Bug 1897, Bug 1319. Also 3 or 4 documents were found to contain code blocks with SFL, which has been fixed. Partial fix for broken links, links to Forum Nokia, and the 'Symbian platform' terminology issues.
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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-C705B0D5-055A-5DAA-9C6E-2FC3519FA50C" xml:lang="en"><title>Publish
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and Subscribe Overview</title><shortdesc>This topic explains the overview of publish and subscribe.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
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<section id="GUID-5F3F1973-C819-436F-A9E2-B02E62F94A29"><title>Purpose</title> <p>Allows global variables to be set and retrieved,
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and allows subscribers to be notified that variables have changed. Note that
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you may find such global variables referred to as properties.</p> </section>
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<section id="GUID-40E87759-7EF6-4503-95CF-9297D2EC2AB1"><title>Architectural relationships</title> <p>Publish and Subscribe
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is implemented on the Kernel side and is accessed from the user side through
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the <xref href="GUID-C4776034-D190-3FC4-AF45-C7F195093AC3.dita"><apiname>RProperty</apiname></xref> handle.</p> </section>
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<section id="GUID-70948A73-79DA-4033-94D0-E6B2046E55B3"><title>Description</title> <p>Publish and Subscribe has three main
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components: properties, publishers and subscribers.</p> <p><b>Properties</b> </p> <p>A property is a single data value, that can be either a single 32-bit
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value or a variable length set of bytes referred to as a byte array. A byte
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array has a maximum size defined by <xref href="GUID-C4776034-D190-3FC4-AF45-C7F195093AC3.dita#GUID-C4776034-D190-3FC4-AF45-C7F195093AC3/GUID-57E64054-610A-31D1-AD7F-E2F9F9FC1DCB"><apiname>RProperty::KMaxPropertySize</apiname></xref>.</p> <p><b>Publishers</b> </p> <p>Publishers are threads that define and update a
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property.</p> <p><b>Subscribers</b> </p> <p>Subscribers
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are threads that listen for changes to a property, and can get the current
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value of a property. Typically, a thread gets the value of a property when
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notified of changes.</p> </section>
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</conbody></concept>