Symbian3/PDK/Source/GUID-E10A3336-9C4C-59A5-B94F-6CECA92FFB9F.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 task
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  PUBLIC "-//OASIS//DTD DITA Task//EN" "task.dtd">
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<task id="GUID-E10A3336-9C4C-59A5-B94F-6CECA92FFB9F" xml:lang="en"><title>Providing
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a Custom Resolver </title><shortdesc>The plug-in framework has a default resolver that selects an appropriate
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implementation to suit the client requests. If the algorithm used by the custom
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resolver is inappropriate, an interface definition can provide its own custom
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resolver. </shortdesc><prolog><metadata><keywords/></metadata></prolog><taskbody>
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<context><p>Custom resolvers are interface implementations that implement
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the <xref href="GUID-38D97F70-383E-3950-B052-CB56965B0B48.dita"><apiname>CResolver</apiname></xref> interface. They are instantiated by the framework
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in response to the <xref href="GUID-1344F049-81C4-3D17-AF46-8B5584680ADB.dita#GUID-1344F049-81C4-3D17-AF46-8B5584680ADB/GUID-C7F147AC-6D77-3169-AAB4-B27262B4333B"><apiname>REComSession::CreateImplementationL()</apiname></xref> calls
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that specify to use a particular custom resolver. Custom resolvers must confirm
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to other aspects of interface implementations, including providing registration
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resource information, and publishing its UID and factory function in an implementation
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proxy table. </p><note> Additionally, in order to be trusted by ECom, the
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plug-in must have the ProtServ capability set in the project file. </note><p>A
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custom resolver class must derive from <xref href="GUID-38D97F70-383E-3950-B052-CB56965B0B48.dita"><apiname>CResolver</apiname></xref>.
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The derived class must implement the following inherited functions: </p> </context>
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<steps id="GUID-B8CC6618-FF31-5E9E-9C74-EE029F6A4A6F">
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<step id="GUID-81A902BA-C325-556A-ACE4-1E945DD82731"><cmd/>
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<info>Implement a factory function that takes an <xref href="GUID-C6201A47-85A9-365C-9B28-48243FA6ACD0.dita"><apiname>MPublicRegistry</apiname></xref> object
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as input. <xref href="GUID-C6201A47-85A9-365C-9B28-48243FA6ACD0.dita"><apiname>MPublicRegistry</apiname></xref> provides the resolver with the
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list of the implementations registered with the plug-in framework that meet
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the requirements of the specified interface. </info>
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</step>
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<step id="GUID-39F2C21F-C917-5D40-B6AE-61CF1C8852E7"><cmd/>
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<info>Implement the <xref href="GUID-38D97F70-383E-3950-B052-CB56965B0B48.dita#GUID-38D97F70-383E-3950-B052-CB56965B0B48/GUID-948455C3-D565-3D6E-ABD0-18E23C4D2C40"><apiname>CResolver::IdentifyImplementationL()</apiname></xref> function
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that takes the UID of the interface for which an implementation is requested.
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The resolver uses the resolution parameters and returns the UID of the best-fit
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implementation. The best-fit algorithm is specific to each custom resolver. </info>
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<info> <xref href="GUID-38D97F70-383E-3950-B052-CB56965B0B48.dita#GUID-38D97F70-383E-3950-B052-CB56965B0B48/GUID-948455C3-D565-3D6E-ABD0-18E23C4D2C40"><apiname>CResolver::IdentifyImplementationL()</apiname></xref> returns a list
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of all matching implementations. </info>
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</step>
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<step id="GUID-3642618B-17BD-594F-8C0B-0985AC3B087F"><cmd/>
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<info>Implement the <xref href="GUID-38D97F70-383E-3950-B052-CB56965B0B48.dita#GUID-38D97F70-383E-3950-B052-CB56965B0B48/GUID-5FDD82E1-9538-3393-A892-44D577EC4090"><apiname>CResolver::ListAllL()</apiname></xref> function. </info>
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</step>
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</steps>
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<example id="GUID-E1354F45-99FB-5509-B9E4-9E0B9E44C6F3"><title>Custom resolver
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example</title> <p>The following code depicts a sample customer resolver. </p> <codeblock id="GUID-552AC3FB-730E-54A6-91EC-EB5A6A65C0B1" xml:space="preserve">class CExampleResolver : public CResolver
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    {
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public:
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    // Factory function: 
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    static CExampleResolver* NewL(MPublicRegistry&amp; aRegistry);
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    ~CExampleResolver();
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    // Implement IdentifyImplementationL()
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    TUid IdentifyImplementationL(TUid aInterfaceUid, 
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    const TEComResolverParams&amp; aParameters) const;
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// Implement ListAllL
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    RImplInfoArray* ListAllL(TUid aInterfaceUid, 
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    const TEComResolverParams&amp; aParameters) const;</codeblock> <p>The
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following code shows a sample standard registration resource required by a
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custom resolver. </p> <codeblock id="GUID-D4072E8E-DB0A-5B3B-ACC5-078F1C3FD83A" xml:space="preserve">RESOURCE REGISTRY_INFO theInfo
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    {
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    dll_uid = 0x10009DB3;
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    interfaces = 
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        {
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        INTERFACE_INFO
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 // interface_uid value is always 0x10009D90. 
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            {
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            interface_uid = 0x10009D90;
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            implementations = 
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                {
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                IMPLEMENTATION_INFO
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                    {
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// uid value is specific to individual resolvers
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                    implementation_uid = 0x10009DB4;
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                    version_no = 1;
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// unused fields
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                    display_name = "";
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                    default_data = "";
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                    opaque_data = "";
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                    }
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                };
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            }
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        };
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    }</codeblock> </example>
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</taskbody></task>