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<reference id="GUID-B14B3D67-B0D5-54B6-AAE4-D4486D019498" xml:lang="en"><title>SystemStateManager: The System State Manager example</title><shortdesc>This example demonstrates the System State Manager (SSM)

API. It consists of System State Manager example executable (ssmanager.exe),

two system state policy plugins (ssm.state.policy.0004.dll and ssm.state.policy.0005.dll),

a system-wide property policy plugin (ssm.swp.policy.dummy.diskstatus.dll),

an example Normal State policy (ssm.state.policy.0001.dll) and a dummy

back-up application (dummybackup.exe). </shortdesc><prolog><metadata><keywords/></metadata></prolog><refbody>

<section id="GUID-2F32F775-F525-5893-A581-3A5396A66333"><title>Purpose</title> <p>This example demonstrates following SSM features </p> <ul>

<li id="GUID-55D30A2E-9EEF-515C-9DA5-2261AD64FD2E"><p>How to write

a System Wide Property (SWP) policy. </p> </li>

<li id="GUID-477F87E7-D3B2-53FB-A96D-8304632AF48D"><p>How to write

a System State policy. </p> </li>

<li id="GUID-3AAA1DCD-F21A-53A2-8AB8-39F42396972D"><p>How to request

a change to an SWP, with and without notification </p> </li>

<li id="GUID-5022B224-8620-5AB8-B8C7-F95296DC7A14"><p>How to request

a change to a system state, with and without notification </p> </li>

</ul> </section>

<li><p><xref href="GUID-60E6220E-5B9B-3D4E-A95F-B7AD6DB8AF68.dita"><apiname>TSsmSwp</apiname></xref></p></li>

<li><p><xref href="GUID-CEBD45FB-5E0E-3EBA-B134-545B7F82EBEC.dita"><apiname>TSsmStateTransition</apiname></xref></p></li>

<li><p><xref href="GUID-76D2A5E8-BC64-3528-BED6-499E52CF8B2B.dita"><apiname>CSsmSystemWideProperty</apiname></xref></p></li>

<li><p><xref href="GUID-89C25B0F-DB76-30D5-A4D6-0C12922194E4.dita"><apiname>RSsmStateAwareSession</apiname></xref></p></li>

<li><p><xref href="GUID-8CE82869-EA9E-327C-B817-ACF497CCDC9D.dita"><apiname>RSsmStateManager</apiname></xref></p></li>

<li><p><xref href="GUID-31FB0BC8-83FC-3581-A7A3-C1781CAE7187.dita"><apiname>MSsmSwpPolicy</apiname></xref></p></li>

<li><p><xref href="GUID-ABE0DF1C-78FB-3141-8AE6-5CC8C73A8034.dita"><apiname>CSsmCommandList</apiname></xref></p></li>

<li><p><xref href="GUID-62413EF5-F6F1-37C9-9213-5178EAE6C2F5.dita"><apiname>MSwpChangeNotificationSubscriber</apiname></xref></p></li>

<li><p><xref href="GUID-4181374F-8545-3AF0-8932-A73138296FD1.dita"><apiname>CSsmCommandListResourceReader</apiname></xref></p></li>

<li><p><xref href="GUID-B29C0C6D-4BFC-3AAF-B9CB-8C200CF4B4C7.dita"><apiname>MSsmConditionalCallback</apiname></xref></p></li>

</ul></section>

<section id="GUID-C68A69F1-0692-50E3-A049-D38D90E4B52B"><title>Design

and implementation</title> <p>The example consists of several components:

a System State Manager example executable (<filepath>ssmanager.exe</filepath>), two system state policy plugins (<filepath>ssm.state.policy.0004.dll</filepath> and <filepath>ssm.state.policy.0005.dll</filepath>), a system-wide

property policy plugin (<filepath>ssm.swp.policy.dummy.diskstatus.dll</filepath>), an example Normal State policy (<filepath>ssm.state.policy.0001.dll</filepath>) and a dummy back-up application (<filepath>dummybackup.exe</filepath>). </p> <p>This section describes the components in the example: </p> <ul>

<li id="GUID-61B148DD-A13E-51C2-9EEB-54E354DE2DB3"><p> <filepath>ssmanager.exe</filepath>: The main process which presents the menu to the user, receives

the input from the user . It has the following functions: </p> <ul>

<li id="GUID-EA2E0A4A-8EC3-5BF8-8994-A2F90E4D032D"><p> <codeph>RequestSwpChange()</codeph>. This demonstrates changing the value of a system wide property

without notifying any clients. When the disk status changes, the dummy

backup application is launched to simulate a disk backup. <codeph>RequestSwpChangeWithNotificationL()</codeph> is similar to RequestSwpChange(),

but it notifies its clients when a value of a system wide property

changes. </p> </li>

<li id="GUID-D87525A4-570E-5CA9-AAC7-721564BDB50A"><p> <codeph>RequestSsChange()</codeph>. This demonstrates changing the system state without notifying any

clients. When the system state changes from 'Normal' to 'Restore'

state, the dummy backup application is launched. <codeph>RequestSsChangeWithNotification()</codeph> is similar to RequestSwpChange(), but it notifies its clients when

a value of a system wide property changes. </p> </li>

</ul> </li>

<li id="GUID-A61E42C7-F62E-5012-86D6-9D71833BB488"><p> <filepath>ssm.state.policy.0004.dll</filepath>:The dummy backup system state policy with custom commands listed

in a resource file (<filepath>ssm_cmdlist_state_dummy_backup.rss</filepath>). The command list is prepared in the dummy backup policy using

the <xref href="GUID-4181374F-8545-3AF0-8932-A73138296FD1.dita"><apiname>CSsmCommandListResourceReader</apiname></xref> class. </p> </li>

<li id="GUID-A74E6A5F-7E2B-5DEF-A8D9-75BDE2BCF765"><p> <filepath>ssm.state.policy.0005.dll</filepath>: The dummy restore system state policy with custom commands defined

using the command factory classes <xref href="GUID-A9E6135E-3C15-3176-A41A-108CE99AE28F.dita"><apiname>MSsmCommand</apiname></xref> and <xref href="GUID-365DF661-A86F-3218-9C77-483526385EDC.dita"><apiname>SsmCommandFactory</apiname></xref>. </p> </li>

<li id="GUID-90199262-D9C1-52C3-8475-02957E8A4E74"><p> <filepath>ssm.swp.policy.dummy.diskstatus.dll</filepath>: The dummy disk status system-wide property with custom commands

listed in a resource file (<filepath>ssm_cmdlist_swp_dummy_diskstatus.rss</filepath>). The command list is prepared by using the <xref href="GUID-4181374F-8545-3AF0-8932-A73138296FD1.dita"><apiname>CSsmCommandListResourceReader</apiname></xref> class. </p> </li>

<li id="GUID-6374DEC2-4AAB-500C-8AFA-EE8BF003F741"><p> <filepath>ssm.state.policy.0001.dll</filepath>: the dummy back up and restore states need to be supported by the

Normal state inorder to allow transition from one state to another.

Hence, the existing Normal state policy file is updated with the changes

required to support these transitions. </p> </li>

<li id="GUID-4F412BA5-3A79-5688-BD95-A3C384981FC1"><p> <filepath>dummybackup.exe</filepath>: The dummy application which is launched when the system state changes

to 'backup'. It just prints a series of statements to the console. </p> </li>

</ul> </section>

and configuring</title> <p>To build the example: </p> <ul>

<li id="GUID-BCB63B67-BA41-5BE6-B80A-3DE0A0211A96"><p>The example

builds the following binaries </p> <p> <filepath>ssmanager.exe</filepath>  </p> <p> <filepath>ssm.state.policy.0004.dll</filepath>  </p> <p> <filepath>ssm.state.policy.0005.dll</filepath>  </p> <p> <filepath>ssm.swp.policy.dummy.diskstatus.dll</filepath>  </p> <p> <filepath>ssm.state.policy.0001.dll</filepath>  </p> <p> <filepath>dummybackup.exe</filepath>  </p> </li>

<li id="GUID-1D7646C4-40E8-5615-BD7C-DAFF33483CD5"><p>You can build

the example from your IDE or the command line. </p> <p>If you use

an IDE, import the <filepath>bld.inf</filepath> file of the example

into your IDE, and use the build command of the IDE. </p> <p>If you

use the command line, open a command prompt, and set the current directory

to the source code directory of the example. You can then build the

example with the SBSv1 build tools with the following commands: </p> <p><userinput>bldmake bldfiles</userinput> </p> <p><userinput>abld

<li id="GUID-53F53A62-94CE-5412-AD52-CC00D4A44053"><p>For the emulator,

the example builds <filepath>ssmanager.exe</filepath> in the <filepath>epoc32\release\winscw\&lt;udeb or urel&gt;\</filepath> folder. </p> </li>

</ul> </section>

</refbody><related-links>

<link href="GUID-26DBE128-6244-557E-989D-A4A608F43A0F.dita"><linktext>System

State Manager Overview</linktext></link>

<link href="GUID-06724AAF-3C6D-5964-B69D-D9D981543505.dita"><linktext>System

State Manager Tutorials</linktext></link>

</related-links></reference>