Symbian3/PDK/Source/GUID-E3BE62B2-9625-5F79-84A4-0248A3F36225.dita
author Graeme Price <GRAEME.PRICE@NOKIA.COM>
Fri, 15 Oct 2010 14:32:18 +0100
changeset 15 307f4279f433
parent 14 578be2adaf3e
permissions -rw-r--r--
Initial contribution of the Adaptation Documentation.
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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-E3BE62B2-9625-5F79-84A4-0248A3F36225" xml:lang="en"><title>Central
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Repository Access Guide</title><shortdesc>This section describes how to make an application read and modify
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a repository at runtime from function calls in its application code. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
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<section id="GUID-02A4A2D8-4167-4AB3-B6B5-8C017D37CC1C"><title>Runtime operations </title> <p><b>Opening
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and closing a repository </b> </p> <p>You open a repository by creating a <codeph>CRepository</codeph> object
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in your code: there is no Open() function. To open several repositories you
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must create one <codeph>CRepository</codeph> object for each of them. These
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objects encapsulate client views of the Central Repository: data integrity
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is maintained by server classes which are not part of the exposed API. You
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read and modify the data in the repository using <codeph>CRepository</codeph> functions
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such as <codeph>Get()</codeph> and <codeph>Set()</codeph>. In order to prevent
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different clients corrupting the repository data with concurrent write operations,
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these operations are wrapped in sequences called transactions. Transactions
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will be explained in the next section. You close a repository by deleting
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the <codeph>CRepository</codeph> object: there is no Close() function. </p> <p>The
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keys are used in the initialization file to identify data items as we saw
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above. They are also used as parameters of the API functions which are used
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to get, set, create, delete, reset and find settings. </p> <p><b>Reading data
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from a repository </b> </p> <p>Various functions of a CRepository object read
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the values of the repository settings. These functions all return an error
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message (KErrNone on success). The data requested by a function is returned
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as the value of a parameter of the function, and the data type of the parameter
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must match the data returned. </p> <p>The Get() functions of a CRepository
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object take individual keys as parameters and retrieve the corresponding values.
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You cannot directly retrieve values by specifying a range of keys: you must
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convert a range to a list of individual keys and pass those keys to a Get()
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function. </p> <p>The Find() functions of a CRepository object convert a range
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of keys into a list of individual keys. The input parameters are a partial
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key and a key mask, defining the range: the list of keys is returned as the
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value of another parameter. The list may contain all the keys in the range,
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or may be restricted to keys with specified values. The restricted Find()
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functions take the value of a setting as an input parameter and return variously
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those keys in the range whose values are equal to the parameter or those which
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are not equal to it. </p> <p>The GetMeta() function of a CRepository object
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reads the metadata value assigned to a key. A metadata value is a 32 bit hexadecimal
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number of which the most significant 8 bits are reserved. The reserved bits
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should normally be masked out so that they cannot be used. To do this you
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use a constant defined for the purpose, KMetaUnreserved, with logical AND.
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A metadata value AND KMetaUnreserved has the reserved bits set to 1. </p> <p><b>Writing
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data to a repository </b> </p> <p>The Set() functions of a CRepository object
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write the values of a setting to a repository where the key already exists. </p> <p>To
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create a new key and write its value, use the Create() functions of a CRepository
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object. </p> <p>To delete a key and its value, use the Delete() functions.
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You can delete a group of keys using the partial key and key mask mechanism. </p> <p>To
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restore the default value of a setting, use the Reset() functions of a CRepository
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object. The default value of a setting is the most recent value which was
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explicitly assigned to it, or else the value assigned in the initialization
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file. If no value was ever assigned, a call to Reset() deletes the setting. </p> <p><b>Changing
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permissions on a setting </b> </p> <p>An access policy cannot be changed at
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run time. The permissions created on an area of keyspace are static: that
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area always has those permissions. However, it is possible to modify access
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to a setting at runtime by moving it from one area of keyspace to another
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area with different permissions. You do this by calling the Move() function
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of the CRepository class. </p> <codeblock id="GUID-C2BB8268-58B4-5492-A953-E7B99793CC80" xml:space="preserve">TInt CRepository::Move (TUint32 aSourcePartialKey, TUint32
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          aTargetPartialKey, TUint32 aMask, TUint32 &amp;aErrorKey) 
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        </codeblock> <p>The parameters <codeph>aSourcePartialKey</codeph> and <codeph>aMask</codeph> define
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one range of keys, the source, and the parameters <codeph>aTargetPartialKey</codeph> and <codeph>aMask</codeph> define
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another, the target. The effect of calling the function is to cause the values
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formerly accessed using the source keys to be accessed using the target keys.
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If the target keys have different permissions from the source, those permissions
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will in future govern access to the values concerned. </p> <p><b>Notification
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of changes </b> </p> <p>It will often be the case that your application accesses
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a repository in order to read data written by a separate application. If so,
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your application must request to be notified whenever the other application
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modifies the relevant settings. To request notification of changes to a setting
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or group of settings you use the <codeph>RequestNotify()</codeph> functions
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of a CRepository object with a <xref href="GUID-E0B34F3E-D4C4-3232-B8B1-7DB35B454646.dita"><apiname>TRequestStatus</apiname></xref> object as
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parameter. The value of this parameter changes when the notification server
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detects a change to the repository. If a single setting has changed, the parameter
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takes the value of that setting: if more than one setting has changed, the
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parameter takes the value <codeph>KUnspecifiedKey</codeph>. To receive notification
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of changes, your code must periodically poll this key. It must also renew
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the <codeph>RequestNotify()</codeph> call before reading the setting which
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has changed. This is important because several changes may occur in quick
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succession and you want to read the latest state of the repository. </p> <p>You
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cancel notifications about specific settings or groups of settings using <codeph>NotifyCancel()</codeph>,
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and you cancel all notifications using <codeph>NotifyCancelAll()</codeph>. </p> </section>
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<section id="GUID-F82316AE-2BC2-4CDD-A1B2-67BE1506F4EE"><title>Error handling</title> <p>Two
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classes of error can occur when a keyspace is installed, upgraded or uninstalled.
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One is installation of a corrupt repository (one which does not conform to
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the specified text or binary format). If the central repository detects corrupt
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repositories, it deletes them. It is preferable to install a repository in
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binary format as corrupt files will then be detected at build time. </p> <p>The
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other class of possible error is system failures such as insufficient memory.
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These prevent the keyspaces from merging and the result is loss of synchronization
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between applications and their repositories. The remedy for errors of this
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kind is to maintain versioning information within the repositories, so that
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the version of a repository can be checked when it is opened and validated
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against the version expected by the client. </p> </section>
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</conbody><related-links>
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<link href="GUID-CBC57511-7F28-596A-9763-5674EB41BCAC.dita"><linktext>Central Repository
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Overview</linktext></link>
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<link href="GUID-36539894-580E-5774-AA79-7F640E8C59E1.dita"><linktext>Central Repository
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Initialization Files Guide</linktext></link>
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<link href="GUID-53E5C9EA-0A38-54A1-AE24-95B71BFFB4B5.dita"><linktext>CenRep Converter
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Tool Tutorial</linktext></link>
5
f345bda72bc4 Week 12 contribution of PDK documentation_content. See release notes for details. Fixes Bug 2054, Bug 1583, Bug 381, Bug 390, Bug 463, Bug 1897, Bug 344, Bug 1319, Bug 394, Bug 1520, Bug 1522, Bug 1892"
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</related-links></concept>