Symbian3/SDK/Source/GUID-8A7B837D-4069-5364-A596-686EEBAE351D.dita
author Graeme Price <GRAEME.PRICE@NOKIA.COM>
Fri, 15 Oct 2010 14:32:18 +0100
changeset 15 307f4279f433
parent 13 48780e181b38
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-8A7B837D-4069-5364-A596-686EEBAE351D" xml:lang="en"><title>Plug-In Framework Overview</title><prolog><metadata><keywords/></metadata></prolog><conbody>
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<p>The Plug-in (ECom) framework is a generic framework that provides
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a single mechanism to register and discover plug-ins and load an appropriate
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plug-in. </p>
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<section id="GUID-495BDDE0-C473-47F1-9FC2-AB73B96FD19F"><title>Purpose</title> <p>In early versions of Symbian platform,
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plug-ins were provided by polymorphic interface DLLs.
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All the frameworks within the Symbian platform that needed to use
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plug-ins had to provide their own mechanisms for the clients to discover
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and instantiate the implementations. This resulted in duplication
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of functionality. </p> <p>The Plug-In framework is intended to provide
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a common and system-wide mechanism for instantiating a dynamically
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determined component. </p> <p>Three distinct users of the plug-in
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framework are: </p> <ul>
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<li id="GUID-B72B2ED5-545F-54BA-89F3-9F014A17D9D8"><p>Framework or
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Application designers </p> <p>These users need to understand interface
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definition design and platform security implications. </p> </li>
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<li id="GUID-F0961823-257F-553D-B58E-8061ECA03FCD"><p>Plug-in writers </p> <p>These users need to understand interface implementation, DLL
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creation and platform security implementation issue. </p> </li>
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<li id="GUID-939853D9-4C52-5C6E-9804-E0594DE2B152"><p>Plug-in users </p> <p>These users need to understand that the plug-in framework helps
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in selecting the plug-in but sometimes may need to specify which implementation
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the framework should choose. </p> </li>
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</ul> </section>
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<section id="GUID-7AECE2EC-36C4-4225-A55F-02E9030CAEF4"><title>Required background</title> <p> <b>Run-time Binding</b>: This is called dynamic binding or late binding. The linking of
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a routine or object is performed during runtime based on the requirements. </p> <p> <b>DLL (Dynamic Link Library)</b>: Is a piece of code (a library)
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that is linked to a program at runtime rather than during the build
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process. The code inside a DLL can be shared by several clients at
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the same time without being duplicated in the mobile memory. </p> <p>In addition , the user should be aware of the<xref href="GUID-9E4D75C0-D797-5541-8E52-3C6D154CC74A.dita"> Platform Security
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Considerations</xref> of the plug-in framework architecture. </p> </section>
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<section id="GUID-4848DB3A-356F-4E82-8DD6-8E71D0392B70"><title>Key concepts and terms</title> <dl>
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<dlentry>
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<dt> Plug-in</dt>
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<dd><p>In computing, a plug-in(extension) consists of a computer program
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that interacts with a host application(a web browser or an email client)
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to provide a very specific function on demand. </p> <p>Applications
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support plugins to: </p> <ul>
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<li id="GUID-E5F6B556-5957-50CE-9309-1013335A3911"><p>Enable third-party
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developers to create capabilities to extend an application. </p> </li>
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<li id="GUID-F882F8D5-A744-5079-9A15-DC5DD166C8BC"><p>Reduce the size
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of an application. </p> </li>
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<li id="GUID-6FC7254E-3CCF-58A2-810A-0B750CA178D5"><p>Separate source
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code from an application. </p> </li>
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</ul> </dd>
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</dlentry>
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<dlentry>
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<dt>Plug-in System</dt>
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<dd><p>A client wishes to access a plug-in. The plug-in details are
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known only at run-time. The general characteristics of the plug-in
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are defined in an interface. Multiple variants of the plug-in can
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co-exist. </p> <p>The four clearly-defined roles of a plug-in system
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are: </p> <ul>
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<li id="GUID-30A0D998-79B7-5039-B4B7-602C6C74F08B"><p>The <b>Client</b> that wishes to access services. </p> </li>
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<li id="GUID-8ED5CDA4-F17A-5BB2-A657-76ECE561844A"><p>The <b>Interface
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Definition</b> that defines how to request services. </p> </li>
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<li id="GUID-C371204A-5D56-52B9-AD55-D69BCCA5812B"><p>The <b>Interface
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Implementation/Plug-in </b> that provides the required processing. </p> </li>
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<li id="GUID-E89C937D-0DA1-5CDD-BDFC-6F4E3FD40FD2"><p>The <b>Framework</b> that provides the clients with the required access to the implementations. </p> </li>
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</ul> <p>The relationships can be represented as follows: </p> <fig id="GUID-47C384EC-4F9E-55EA-B50B-7DAD9E990865">
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<title>                   Plug-in relationships                  </title>
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<image href="GUID-CBD78250-3EF4-5DF0-B356-19996E15BBBD_d0e177724_href.png" placement="inline"/>
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</fig> <p>The instantiation mechanism is responsible for providing
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the services that identify, and load the correct implementation at
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run-time. </p> </dd>
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</dlentry>
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<dlentry>
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<dt> Interface</dt>
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<dd><p>Is an abstraction that an entity provides of itself to the
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outside. This separates the methods of external communication from
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internal operation. It allows internal modification and this modification
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does not affect the outside entities interaction with the interface.
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An interface can provide multiple abstractions. </p> </dd>
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</dlentry>
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<dlentry>
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<dt> Interface API / Interface Definition</dt>
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<dd><p>Is a template for an interface implementation. </p> </dd>
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</dlentry>
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<dlentry>
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<dt>Interface Client/Client</dt>
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<dd><p>Is an application that uses the interface definition. </p> </dd>
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</dlentry>
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<dlentry>
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<dt>Interface Implementation Collection</dt>
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<dd><p>Is a collection of interface implementations/plug-ins. </p> </dd>
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</dlentry>
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<dlentry>
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<dt>Registry</dt>
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<dd><p>Is a collection of plug-ins registered with the framework. </p> </dd>
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</dlentry>
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</dl> </section>
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<section id="GUID-861B53D9-1928-45FB-97D0-D3DBCB31EC4F"><title>Architecture</title> <p>The plug-in framework employs
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the client server architecture. The client session is a singleton
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per process thread. </p> <fig id="GUID-7B34EF3B-5C56-5CA8-ABC0-60AB4F5652A1">
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<title>              Plug-in framework architecture            </title>
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<image href="GUID-2E3A91F9-5538-5E23-8D23-CE97B677A668_d0e177801_href.jpg" placement="inline"/>
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</fig> <p>The functional components of the plug-in framework are: </p> <ul>
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<li id="GUID-57437172-8AE4-5355-8776-E14C3298A6A1"><p>The <b> Client
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/Interface Client</b> that invokes the available services via the
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interface definition. </p> </li>
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<li id="GUID-807D6C07-9202-549D-9250-17806FBE1C40"><p>The <b>Server
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/ Framework</b> controls access to a registry of available implementations
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that is used for interface implementation resolution and loading. </p> <p>The server facilitates: </p> <ul>
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<li id="GUID-5A87C3FF-3576-5EAD-BD49-E2B498A09340"><p>Addition and
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removal of interface implementations. </p> <p>The addition, removal
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or modifications to an implementation is notified to the server. The
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server updates the changes in the registry. </p> </li>
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<li id="GUID-7D2957EE-C6BF-5687-84AA-A44C1EFBFD42"><p>Search/Access
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mechanisms. </p> <p>The registry data is maintained as a hierarchical
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arrangement of implementations. The complete data is scanned and matching
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interface implementation list is produced as a result of search. </p> </li>
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<li id="GUID-B44DA453-D953-515C-8B6C-D6F315CD03BD"><p>Resolution mechanisms. </p> <p>The best fit implementation from the resultant search is identified. </p> </li>
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<li id="GUID-1ABE83FD-E2DE-5A72-BBEA-F6F216961C9D"><p>Load control. </p> <p>Controls access to a single instance of the available implementations.
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The implementation identification information is used to load the
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appropriate collection. </p> </li>
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</ul> </li>
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</ul> </section>
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<section id="GUID-D9E09CF7-97F8-44F9-9557-63C1E84BD43A"><title>APIs</title> <table id="GUID-1B7014F2-7210-554B-BE78-35560FF68FE0">
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<tgroup cols="2"><colspec colname="col0"/><colspec colname="col1"/>
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<thead>
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<row>
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<entry>API</entry>
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<entry>Description</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry><p> <xref href="GUID-1344F049-81C4-3D17-AF46-8B5584680ADB.dita"><apiname>REComSession</apiname></xref>  </p> </entry>
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<entry><p>Resolves, instantiates, and destroys interface class implementations
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requested by the plug-in framework clients. </p> </entry>
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</row>
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</tbody>
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</tgroup>
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</table> </section>
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<section id="GUID-6B41C7BF-CF5C-47FF-9EC8-C23CBFE0D0AF"><title>Typical uses</title> <p>The plug-in framework allows: </p> <ul>
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<li id="GUID-593D6FAD-EF95-53E8-B4C2-A60EF4A9DB1A"><p>Framework developers
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to write interface definitions and extend interfaces. </p> </li>
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<li id="GUID-DD0929A4-F9E4-5B70-8D3D-7D5697A09C27"><p>Plug-in writer
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to implement the interfaces. </p> </li>
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<li id="GUID-272F59F3-8EF6-58C4-9F61-9532D1D0EC46"><p>Plug-in user
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to use the interfaces. </p> </li>
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</ul> </section>
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</conbody><related-links>
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<link href="GUID-41D80358-473F-5B50-A09A-4F5601EAC4A9.dita"><linktext>Framework
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Developer Tutorials</linktext></link>
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<link href="GUID-57F29787-B425-53EA-9DB4-372B77543584.dita"><linktext>Plug-in
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Writer's Tutorials</linktext></link>
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<link href="GUID-DE9CB4F7-5129-5450-A6D6-9B0BA253FC81.dita"><linktext>Plug-in
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User's Tutorials</linktext></link>
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</related-links></concept>