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    10 <!DOCTYPE concept

    11   PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">

    12 <concept id="GUID-940F3F6E-BA9C-5E19-9AC5-D848B5E175FB" xml:lang="en"><title>Application

    13 Architecture Overview</title><prolog><metadata><keywords/></metadata></prolog><conbody>

    14 <p>APPARC provides access to a cached list of applications, and their properties,

    15 on the device. APPARC also provides a mechanism for launching applications

    16 and switching between tasks. </p>

    17 <section><title>Purpose</title> <p>The main purpose of APPARC is to </p> <ul>

    18 <li id="GUID-869A9DDC-5BCE-58FE-A404-8B10B00ED539"><p>manage and register

    19 applications with the device </p> </li>

    20 <li id="GUID-C4C659F3-027E-5216-A0FD-DEA4A135081F"><p>scan the device for

    21 installed applications and associate data types to the applications based

    22 on the information in the registration file </p> </li>

    23 <li id="GUID-37BADDBF-EFFF-56C6-9348-9CB8D162B8CF"><p>load applications and

    24 manage the creation and destruction of application objects and document objects </p> </li>

    25 <li id="GUID-4FBABF6C-D3E5-5086-A45B-90A5927185CF"><p>support the registration

    26 of non-native applications </p> </li>

    27 <li id="GUID-5A799FDF-A676-5538-BDE0-FCDAB7857631"><p>define a Server Application

    28 Framework, which allows applications to communicate through the client-server

    29 architecture </p> </li>

    30 <li id="GUID-907A3B8B-EF8B-5280-B825-7C8D15038E50"><p>support multiple service

    31 types over the client-server link and establish a client-server connection

    32 to an already running server application </p> </li>

    33 <li id="GUID-F4DCD71D-2713-5C7E-83AC-DE976DCD6ECD"><p>monitor the lifetime

    34 of the server application </p> </li>

    35 <li id="GUID-B11E42C5-4326-5A59-A07C-95AE266AEAE3"><p>define the basic polymorphic

    36 interfaces that applications must conform to, such as, <xref href="GUID-C0297A58-2E39-3211-A2B4-C334192CE2A7.dita"><apiname>CApaApplication</apiname></xref> and <xref href="GUID-D7041709-1EBE-3E42-8E16-C7F62081AFB7.dita"><apiname>CApaDocument</apiname></xref>  </p> </li>

    37 <li id="GUID-AED566ED-D731-5A2D-956A-41A5AD0B0943"><p>provide a list of available

    38 control panel applications present on the device. </p> </li>

    39 </ul> </section>

    40 <section><title>Key concepts and terms</title> <dl>

    41 <dlentry>

    42 <dt>Server Application Framework</dt>

    43 <dd><p>The Server Application Framework provides generic service support over

    44 a client-server link, on which real services can be created. A service typically

    45 provides a client-side interface that clients can use directly, and a server-side

    46 interface that server applications have to implement. </p> </dd>

    47 </dlentry>

    48 </dl> </section>

    49 <section><title>Architecture</title> <p>The following diagram shows the interaction

    50 of APPARC with other components. </p> <fig id="GUID-B597764E-2919-55D3-848B-D8579A4E0A98">

    51 <image href="GUID-940AF1CE-3C33-54BF-B339-B8CF79C5FC9C_d0e146649_href.jpg" placement="inline"/>

    52 </fig> <p>The following list describes the interaction between APPARC and

    53 each of the components depicted in the APPARC architectural diagram: </p> <ul>

    54 <li id="GUID-BAA2F511-151F-5B24-9B31-B6203C8905C4"><p>APPARC provides the

    55 basic behavior for GUI-based applications. APPARC also provides basic behavior

    56 for documents in a document-view based application. Uikon builds on the basic

    57 behavior that APPARC provides for GUI applications. PIM application components

    58 (Contacts and Calendar) derive the basic behavior for GUI-based applications

    59 from APPARC. </p> </li>

    60 <li id="GUID-6E250526-6427-5D7C-BED6-AA903C27E342"><p>APPARC maintains a list

    61 of installed applications on the device. APPARC supports rule-based application

    62 launching which is implemented as ECOM plug-ins. These plug-ins define rules

    63 that enable APPARC to either deny or accept the application launch requests. </p> </li>

    64 <li id="GUID-EF948E8F-3540-5346-BC63-FCEAD9AA80A7"><p>Software Install (SWI)

    65 allows installing, uninstalling and upgrading of native software on the device.

    66 When an application needs to be installed, SWI uses APPARC for launching applications

    67 if run-on-install or run-on-uninstall is specified. </p> </li>

    68 <li id="GUID-30282950-6E98-5988-A05B-2B5D8E86848C"><p>When an application

    69 is launched APPARC interacts with the GDI and BIT GDI components to associate

    70 the application with the appropriate application icon, caption and display

    71 screen. </p> </li>

    72 </ul> </section>

    73 <section><title>API summary</title> <table id="GUID-8AE3BE8D-64A7-5356-B7C8-9C399A2C09D7">

    74 <tgroup cols="2"><colspec colname="col0"/><colspec colname="col1"/>

    75 <thead>

    76 <row>

    77 <entry><p><b>API</b></p></entry>

    78 <entry><p><b>Description</b></p></entry>

    79 </row>

    80 </thead>

    81 <tbody>

    82 <row>

    83 <entry><p> <xref href="GUID-C0297A58-2E39-3211-A2B4-C334192CE2A7.dita"><apiname>CApaApplication</apiname></xref>  </p> </entry>

    84 <entry><p>A class that defines the basic twin roles of an application class: </p> <ul>

    85 <li id="GUID-D25C2518-DEAB-54F1-AD7D-64D5C98C230E"><p>as a factory that creates

    86 concrete document objects </p> </li>

    87 <li id="GUID-5807892A-1432-5CD9-BF89-B9FF1DE369B5"><p>as a supplier of utility

    88 functions not specific to any particular instance of a document. </p> </li>

    89 </ul> </entry>

    90 </row>

    91 <row>

    92 <entry><p> <xref href="GUID-A7C7B19A-66D8-38A7-B5D6-03B81D2F2C93.dita"><apiname>CApaAppListNotifier</apiname></xref>  </p> </entry>

    93 <entry><p>An application list change notifier that provides a notification

    94 whenever an application is added or deleted. </p> </entry>

    95 </row>

    96 <row>

    97 <entry><p> <xref href="GUID-0510F0C4-2D81-3C4A-A3FC-95B9F624FF14.dita"><apiname>CApaCommandLine</apiname></xref>  </p> </entry>

    98 <entry><p>A class that provides information for launching an application.

    99 This class is often referred to as a command line and it contains </p> <ul>

   100 <li id="GUID-41D2C6FB-1E60-5BCB-B478-0DC4D0ECCCD6"><p>the name of the application

   101 EXE to be launched </p> </li>

   102 <li id="GUID-4D1DB1CC-8D6A-5A8C-921B-A6885F1B0336"><p>the document name </p> </li>

   103 <li id="GUID-A7E91EAD-7C40-56F6-83E2-106FA9E98F1D"><p>a command code that

   104 defines the way an application is launched (the structure of this depends

   105 on the application to be launched). </p> </li>

   106 </ul> </entry>

   107 </row>

   108 <row>

   109 <entry><p> <xref href="GUID-D7041709-1EBE-3E42-8E16-C7F62081AFB7.dita"><apiname>CApaDocument</apiname></xref>  </p> </entry>

   110 <entry><p>The base class for all documents. A document contains the data associated

   111 with the content of the application. </p> </entry>

   112 </row>

   113 <row>

   114 <entry><p> <xref href="GUID-4FB064FC-210C-384A-BE92-35CA399B34C3.dita"><apiname>CApaSystemControlList</apiname></xref>  </p> </entry>

   115 <entry><p>A class that provides a list of all available control panel applications

   116 present on the device. This class is implemented as a linked list of <xref href="GUID-460DE2A7-6E12-3B0D-9026-63119F093EB6.dita"><apiname>CApaSystemControl</apiname></xref>. </p> </entry>

   117 </row>

   118 <row>

   119 <entry><p> <xref href="GUID-C4F91485-6386-36EC-982B-DC2B7AAE7B7A.dita"><apiname>CServiceRegistry</apiname></xref>  </p> </entry>

   120 <entry><p>The Service Registry stores associations between service-datatype

   121 pairs and applications. The service-datatype pair is the primary key for the

   122 registry. </p> </entry>

   123 </row>

   124 <row>

   125 <entry><p> <xref href="GUID-2E824A1A-078A-3D43-8B49-DF6328330B51.dita"><apiname>RApaAppServiceBase</apiname></xref>  </p> </entry>

   126 <entry><p>The base class that provides a client-side interface for accessing

   127 server applications. </p> </entry>

   128 </row>

   129 <row>

   130 <entry><p> <xref href="GUID-5EEE8745-F483-33C0-A5B1-AEB5544DE2BA.dita"><apiname>RApaLsSession</apiname></xref>  </p> </entry>

   131 <entry><p>A session with the APPARC server providing access to a cached list

   132 of applications on the device. </p> </entry>

   133 </row>

   134 </tbody>

   135 </tgroup>

   136 </table> </section>

   137 <section><title>Typical uses</title> <p><b>Developing a GUI-based application</b> </p> <p>A

   138 GUI-based application can be developed using the <xref href="GUID-C0297A58-2E39-3211-A2B4-C334192CE2A7.dita"><apiname>CApaApplication</apiname></xref> and <xref href="GUID-D7041709-1EBE-3E42-8E16-C7F62081AFB7.dita"><apiname>CApaDocument</apiname></xref> interfaces.

   139 For more information, see <xref href="GUID-1D7BD70F-40A3-53FF-8150-A9CAFA4D01D8.dita"> A

   140 Minimal UI Application</xref>. </p> <p><b>Enumerating applications</b> </p> <p>APPARC

   141 provides a set of APIs that can enumerate the list of applications on the

   142 device. For more information, see <xref href="GUID-4E1B057E-5291-54FC-A0C0-37234CBFBD8E.dita">Enumerating

   143 applications</xref>. </p> <p><b>Accessing running applications</b> </p> <p>Applications

   144 running on a device are known as tasks. The <xref href="GUID-E1A1806C-8757-35DF-A4FB-AE3C63DED364.dita"><apiname>TApaTaskList</apiname></xref> class

   145 is used to access applications running on a device, where each task can be

   146 an instance of the <xref href="GUID-851055CF-D5E6-34EA-8D4B-53FC50D90C24.dita"><apiname>TApaTask</apiname></xref> class, which is used to manipulate

   147 or query tasks. For more information, see <xref href="GUID-0F1CB874-391F-5D44-B960-517E447DC712.dita">Accessing

   148 and manipulating running applications</xref>. </p> <p><b>Creating a control

   149 panel application</b> </p> <p>APPARC provides an API to create a control panel

   150 application. For more information, see <xref href="GUID-86AB2626-27F1-5761-85F7-5644C5D0A675.dita">Creating

   151 control panel applications</xref>. </p> <p><b>Creating a new service</b> </p> <p>The

   152 server application framework supports platform-level services between client

   153 and server applications. These services must be defined for client and server

   154 applications to communicate. For more information, see <xref href="GUID-5862F14F-5BB7-584B-A8B1-447975C42D49.dita">Creating

   155 a new service</xref>. </p> <p><b>Using a service in a client</b> </p> <p>Clients

   156 and server applications interact through a common service, which adheres to

   157 a protocol defining the communication channel between the two. This inter-process

   158 communication channel also provides a security checkpoint for application

   159 capability checking and so on. Services provide useful functionality to clients.

   160 For more information, see <xref href="GUID-B12A3024-44BF-51FF-9B84-14DB99ADC907.dita">Using

   161 a service in a client</xref>. </p> <p><b>Implementing services in a server

   162 application</b> </p> <p>Server applications can have one or many services.

   163 Each service type has a unique identification (UID). For more information,

   164 see <xref href="GUID-A5E4A8AD-8A40-5567-AE97-8CC6B496093E.dita">Implementing services

   165 in a server application</xref>. </p> </section>

   166 </conbody><related-links>

   167 <link href="GUID-58035B49-2EAE-5144-B226-28AF2EDD62E7.dita"><linktext>Generic Application

   168 Support</linktext></link>

   169 <link href="GUID-827AFAA3-75A4-5F08-8F83-1E36DAD8533D.dita"><linktext>Secure Software

   170 Install</linktext></link>

   171 <link href="GUID-FC2F5CDE-D140-5893-894D-D9B93AF6BDC2.dita"><linktext>Using Uikon</linktext>

   172 </link>

   173 <link href="GUID-E89F034F-C807-5FF9-B06B-F7CCD2441041.dita"><linktext>Graphics

   174 Device Interface (GDI)</linktext></link>

   175 <link href="GUID-638C061E-49BE-4297-8C02-E3EE261C7F26.dita"><linktext>Calendar

   176 Guide</linktext></link>

   177 </related-links></concept>