author | Dominic Pinkman <Dominic.Pinkman@Nokia.com> |
Thu, 21 Jan 2010 18:18:20 +0000 | |
changeset 0 | 89d6a7a84779 |
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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-F14A2252-7D7B-5631-9796-3C9AC54014E7" xml:lang="en"><title>Repetitive |
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Search</title><prolog><metadata><keywords/></metadata></prolog><conbody> |
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<p>When a new search-sort asynchronous operation is successful, a unique ID |
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is returned to the client, which is referred as query ID. This query ID can |
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be used to repeat the same search-sort query. </p> |
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<section><title>Required background</title> <p>To do a repetitive search operation, |
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that is searching messages using a query ID, you must first get the query |
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ID of that search operation. </p> </section> |
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<section><title>Introduction</title> <p>Every new search-sort asynchronous |
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query that is successful is assigned with a unique 32 bit integer value, which |
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is referred to as a <xref href="GUID-01500959-E1C8-3491-B8F1-0D2F0512CC16.dita"><apiname>query ID</apiname></xref>. This query ID is |
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used to initiate the same search-sort operation (initiate a repetitive query) |
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in future. The query ID can be retrieved using the <xref href="GUID-5D956759-5D21-3715-916E-F7E703172762.dita#GUID-5D956759-5D21-3715-916E-F7E703172762/GUID-1893C3C7-4F77-3630-B115-A161CCA2665A"><apiname>CMsvSearchSortOperation::GetQueryIdL()</apiname></xref> function. </p> <p><b>Marking</b> </p> <p>When the search-sort cache reaches its maximum size the message server |
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deletes the least recently used query to accommodate a new one. However, there |
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may be some queries and their results which the client wants to keep in the |
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cache, irrespective of how frequently they are being used. </p> <p>Such queries |
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can be marked by the client to indicate to the Messaging server that the query |
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should not be disposed from the search-sort cache when the cache is full. |
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Marked queries are considered for deletion only if all of the remaining queries |
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are also marked. </p> <p>To mark a query ID, use the <codeph>TBool aMarkQuery</codeph> parameter |
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in the <xref href="GUID-5D956759-5D21-3715-916E-F7E703172762.dita#GUID-5D956759-5D21-3715-916E-F7E703172762/GUID-6C81A72A-3BEC-3D18-9CAD-46E9309C3FEB"><apiname>CMsvSearchSortOperation::RequestL()</apiname></xref> function in |
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your client application. </p> <codeblock id="GUID-EED135A5-C141-5525-9C0C-DCF318040C46" xml:space="preserve">IMPORT_C void RequestL (CMsvSearchSortQuery* aQuery, TBool aMarkQuery, TRequestStatus& aQueryStatus, TInt aIterator=0)</codeblock> <p><b>Unmarking</b> </p> <p>To unmark a query ID, use the CMsvSearchSortOperation::UnmarkQuery() |
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function in your client application. </p> <codeblock id="GUID-1C27E207-33F0-5F64-81FC-C50BF257BCB7" xml:space="preserve">IMPORT_C TInt UnmarkQuery (const TInt aQueryId )</codeblock> <fig id="GUID-7D09EFAE-67B3-5142-A6EF-F9D86E39414F"> |
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<title> Repetitive search request process </title> |
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<image href="GUID-E9F08BCA-39F6-55D3-8974-BD0FFB90DE11_d0e259139_href.png" placement="inline"/> |
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</fig> </section> |
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<section><title>Procedure</title> <ol id="GUID-E149145A-A3CB-5CE9-9484-9A7B41E9D302"> |
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<li id="GUID-9D17EF5C-BCA1-5FAE-BE69-DDF6B441F4A5"><p>To get a query ID, complete |
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the steps from 1 to 10 in <xref href="GUID-3F938A76-3F27-56ED-BB3D-0E7EC4ACFB9C.dita">New |
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Search</xref>. </p> </li> |
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<li id="GUID-CD3AABCA-4A90-5B1C-8D77-A2E76161DF2A"><p>Get the query ID from |
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step 10 and start the search operation using the query ID as the search parameter. </p> </li> |
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</ol><codeblock xml:space="preserve">void CSearchsortExample::SeachSortRequestByQueryIdL() |
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{ |
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//1. Create a session with message server |
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// NOTE: CMsvSession::OpenSyncL requires a &MMsvObserver parameter. This example assumes that |
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// CSearchSortExample implements MMsvObserver. |
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CMsvSession* session = CMsvSession::OpenSyncL(*this); |
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CleanupStack::PushL(session); |
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//2. Create an instance of CMsvSearchSortOperation to perform a |
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//search-sort operation |
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CMSvSearchSortOperation* search = CMSvSearchSortOperation::NewL(*session); |
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CleanupStack::PushL(search); |
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//3. Start the search operation using the query ID as the search parameter |
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TRequestStatus aStatus; |
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search->RequestL(iQueryId, aStatus); |
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//4. Wait for the result |
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User::WaitForRequest(aStatus); |
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//5. Create an array to hold Search-sort results |
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RArray<TMsvId> resultArray; |
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//6. Retrieve the results of the search. The format for the results should be the same as |
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// what is configured in step 2. Else, will leave with the KErrMsvInvalidResultRequest |
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// error |
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TInt err = search->GetResultsL(resultArray); |
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if(ret == KErrNone) |
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{ |
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TInt count = resultArray.Count(); |
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} |
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//7. Store the query ID. This ID can be used in repetitive search queries. |
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iQueryId = search->GetQueryIdL(); |
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CleanupStack::PopAndDestroy(2); //search, session |
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}</codeblock> </section> |
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<example><title>Search-sort example</title> <p><xref href="GUID-B26A4743-F331-5AC3-A40A-28B14B785857.dita">SearchSortExample: |
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Enhanced Search and Sort for Message Store </xref> </p> </example> |
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<section><title>See also</title> <p>For conceptual information on search-sort |
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APIs, see <xref href="GUID-32C1FC8B-F7D2-5275-BDF2-0D662551294C.dita">Search-Sort |
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Introduction</xref>. </p> </section> |
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</conbody></concept> |