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<concept id="GUID-A5ED089C-8831-5E25-AE7C-8E6F1C21D3BE" xml:lang="en"><title>Writing

a CSBEClient for Restore</title><shortdesc>This section describes the recommended <apiname>conn::CSBEClient</apiname> function

calls for a partial and incremental restore. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>

<section><title>Context</title> <p>A partial restore restores the data of

specified data owners. The Security IDs (SIDs) of the specified data owners

must be passed to the Backup Engine. </p> <p>An incremental restore restores

files that are saved in the previous incremental backup. After each incremental

backup, a snapshot, which saves the file list and details of each data owner,

is saved. Before each incremental restore, the previously saved backup snapshots

must be provided to the Backup Engine. </p> </section>

<section id="GUID-FAF6DC1F-C569-5573-9503-EC65FF9C94E1"><title>Steps</title><ol id="GUID-5CF38BF0-1174-575C-929E-64C260260C0C">

<li id="GUID-AA22D309-4E70-527F-8B97-B18423E7A8CC"><p>The user application

must instantiate <xref href="GUID-169BB4E2-5B0E-3719-A7B8-A3C0AAA602E2.dita#GUID-169BB4E2-5B0E-3719-A7B8-A3C0AAA602E2/GUID-FB671D02-0F15-396F-9FB7-EE3E9372093C"><apiname>conn::CSBEClient</apiname></xref> to connect to the Backup

Engine. </p> <codeblock id="GUID-01B82F51-F453-5042-B77D-3AF1BC046A5F" xml:space="preserve">iRestoreClient = CSBEClient::NewL();</codeblock> </li>

<li id="GUID-4DC27B19-1573-520F-98E7-FA77F524EEC1"><p>Supply the list of data

owners got from the host PC to the Backup Engine. </p> <p>To restore the data

of specified data owners, pass the array of the SID of these data owners to

the Backup Engine. </p> <codeblock id="GUID-5F0F4CE6-AC01-5248-B9D5-BF15A3F7E38A" xml:space="preserve">iRestoreClient-&gt;SetSIDListForPartialBURL(RSIDArray&amp; aSIDs);</codeblock> </li>

<li id="GUID-1A91A122-BB2D-590F-8D3C-74BCA5100ABC"><p>Set the Back Engine

to the restore mode which signals the start of a restore. </p> <p>The Backup

Engine then <xref href="GUID-88A5F321-17BA-566B-B025-22DB11664E54.dita">publishes

the mode to the subscribed data owners</xref>. This gives the data owners

some time to prepare for the restore, for example they can release resources

in case of file lock or data conflict. </p> <p>The mode contains the restore

types: full or partial, base or incremental. </p> <codeblock id="GUID-223EE0DD-DBD2-543C-9917-CD4DB938154E" xml:space="preserve">iRestoreClient-&gt;SetBURModeL (

                              const TDriveList& aDriveList,

                              //Specify partial restore,

                              //defined in epoc32/include/connect/sbdefs.h

                              TBURPartType aBURType,      

                              //Specifiy incremental restore,

                              //defined in epoc32/include/connect/sbdefs.h

                              TBackupIncType aBackupIncType

                            );

</codeblock> </li>

<li id="GUID-7F3051A3-BD5C-591A-ABCE-74DED46E9E3D"><p>Supply system files

to the Backup Engine for restore. </p> <codeblock id="GUID-8E1098CB-B432-51CE-8D80-292B6E185A70" xml:space="preserve">iRestoreClient -&gt;SupplyDataL(

                              CSBGenericTransferType& aGenericTransferType,

                              TBool aFinished

                             );</codeblock> </li>

<li id="GUID-89F6E682-8B16-5B83-A791-52BE036EBC89"><p>Signal that all system

files have been restored. </p> <p>This step must be invoked to ensure that

system files have been released for data owners to use. It triggers the Backup

Engine to start data owners for the restore. </p> <codeblock id="GUID-9F669D8B-3BFB-5EB2-A4A3-456B2F75DC4E" xml:space="preserve">iRestoreClient-&gt;AllSystemFilesRestored();</codeblock> </li>

<li id="GUID-7BCA299B-803F-5C10-B9FB-4833983B0619"><p>Request the state of

active data owners. </p> <p>This step ensures that the data owners are ready

to supply the data, for example file locks are released. </p> <codeblock id="GUID-80A8205B-5B54-5986-A285-F185587573E6" xml:space="preserve">iRestoreClient-&gt;SIDStatusL(RSIDStatusArray&amp; aSIDStatus);</codeblock> </li>

<li id="GUID-113A8BCF-B055-51A7-B54B-AF1A8FA57A21"><p>Supply passive private

data and its snapshot to the Backup Engine for restore. </p> <codeblock id="GUID-32C548A1-A04D-5470-B6BF-72B994183DFB" xml:space="preserve">iRestoreClient-&gt;SupplyDataL(

                             CSBGenericTransferType& aGenericTransferType,

                             TBool aFinished

                            );</codeblock> <p> <b>Note</b>: For more information

about creating snapshot transfer types, refer to the <xref href="GUID-8BFC185E-91FD-5E04-A26C-728B06F31FDD-GENID-1-7-1-23-1-1-4-1-3-1-6-1-6-1.dita">Creating

transfer types</xref> section. </p> </li>

<li id="GUID-C5ED3083-8876-59CB-8D3C-CB404F1CCC71"><p>The backup server restores

the public files. </p> <p>Similar to a backup, the Backup Engine does not

restore public files. Device creators must get the public files from the host

PC and restore them to the device in their backup server implementations. </p> </li>

<li id="GUID-2BE0338B-6C06-5159-A3F1-4B8B85E56048"><p>Supply active private

data to the Backup Engine for restore. </p> <codeblock id="GUID-9CC18592-E7F6-517B-8937-4E06A2EC1E80" xml:space="preserve">iRestoreClient-&gt;SupplyDataL(

                             CSBGenericTransferType& aGenericTransferType,

                             TBool aFinished

                            );</codeblock> </li>

<li id="GUID-04CC0D4A-F4C1-5515-ABA3-9D746309455D"><p>Set the Backup Engine

into the normal mode. </p> <p>After the data is restored on the device, set

the Backup Engine to the normal mode. The subscribed data owners respond to

the signal and resume the state before the backup. For example resume file

locks or a GUI application recovers to the state and view prior to the restore. </p> <codeblock id="GUID-DA11715F-2F70-5AA8-978E-982B2C857E37" xml:space="preserve">iRestoreClient-&gt;SetBURModeL(

                             const TDriveList& aDriveList,

                             TBURPartType aBURType,

                             TBackupIncType aBackupIncType

                            );</codeblock> </li>

</ol> </section>

</conbody><related-links>

<link href="GUID-0BD22FDB-1A5C-56AA-A7FC-BD2271B2F928.dita"><linktext>Writing a

Backup Engine Client (CSBEClient)</linktext></link>

</related-links></concept>