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examples/SysLibs/CentRepExample/centrepexample.cpp

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// Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies).
// All rights reserved.
// This component and the accompanying materials are made available
// under the terms of "Eclipse Public License v1.0"
// which accompanies this distribution, and is available
// at the URL "http://www.eclipse.org/legal/epl-v10.html".
//
// Initial Contributors:
// Nokia Corporation - initial contribution.
//
// Contributors:
//
// Description:
// This example program demonstrates the use of the Central Repository. 
// The code demonstrates how to open this repository, read its settings, 
// change them, perform read-write operations in a transaction, 
// find settings, restore default settings, request change notifications 
// and delete settings.
// The program requires that before it is run a data file representing
// a repository is present in the private\10202be9 directory on the
// emulator.
// The example defines an example repository in the E80000AD.txt file.
// This text file can be installed directly, but it is recommended
// that repository files are first converted to binary format using the 
// CentRepConv tool.
// To do this:  
// - Copy E80000AD.txt file to the epoc32\winscw\c location on your kit.
// - Start a command line prompt, cd to epoc32\RELEASE\WINSCW\UDEB, and run the
// command CentRepConv C:\E80000AD.txt 
// - This then displays that the file has been converted to the new binary file 
// E80000AD.cre. 
// - Copy this file to the epoc32\RELEASE\WINSCW\UDEB\Z\private\10202be9
// directory on your kit.
//



#include "centrepexample.h"
#include <e32cons.h>
#include "asyncwaiter.h"

_LIT(KTitle, "Central repository example");
_LIT(KTextPressAKey, "\n\nPress any key to step through the example");
_LIT(KExit,"\nPress any key to exit the application ");
_LIT(KPressAKey,"\nPress any key to continue \n");
_LIT(KErr,"\nThe repository file has not been set up. Please see the instructions in centrepexample.cpp for how to do this");

_LIT(KOpen,"\n\nOpening the repository and displaying some initial settings");
_LIT(KChangeSet,"\nChanging some settings in the repository");
_LIT(KReadSet,"\nReading the changed settings");
_LIT(KTransact,"\n\nPerforming read and write transactions");
_LIT(KDelete,"\n\nCreating integer and real number settings and deleting them");
_LIT(KMove,"\n\nMoving the key to target position");
_LIT(KReset,"\nResetting settings to default values, and getting notifications that the changes have occurred");
_LIT(KFind,"\nFinding settings for simple and structured data");
_LIT(KNonExisting,"\n\nValue of new setting is %d");
_LIT(KInt,"\nValue of setting with key x01 is %d");
_LIT(KReal,"\nValue of setting with key x02 is %f");
_LIT(KInteg,"\nValue of setting with key x06 is %d \n");
_LIT(KIntBefore,"\nValue of setting with key x01 before reset is %d");
_LIT(KIntAfter,"\nValue of setting with key x01 after reset is %d");
_LIT(KIdsFound,"\nFound %d settings");
_LIT(KStringName,"Another string");
_LIT(KString1_UpdatedValue, "Value of setting with key x05 is %s");

static const TUid KUidRepository = { 0xE80000AD };
const TUint32 KNonExistentSetting = 0x10;
const TUint32 KInt1 = 0x01;
const TUint32 KInt3 = 0x06;
const TUint32 KReal1 = 0x02;
const TUint32 KString1 = 0x05;
const TInt KInt1_InitialValue = 1;
const TInt KInt1_UpdatedValue = 73;
const TReal KReal1_InitialValue = 14.91;
const TReal KReal1_UpdatedValue = 72.8;
const TUint32 KMoveTarget = 0x30;

CCentRepExample* CCentRepExample::NewLC()
        {
        CCentRepExample* rep = new(ELeave) CCentRepExample();
        CleanupStack::PushL(rep);
        rep->ConstructL();
        return rep;
        }
        
CCentRepExample::CCentRepExample()
        {
        }       

void CCentRepExample::ConstructL()
        {
        
        iConsole = Console::NewL(KTitle,TSize(KConsFullScreen,KConsFullScreen));
        iConsole->Printf ( KTextPressAKey );
        iConsole->Getch ();
        }

CCentRepExample::~CCentRepExample()
        {
        iConsole->Printf(KExit);
        iConsole->Getch();
        
        delete iConsole;
        delete iRepository;
        }


void CCentRepExample::ResetL()
        {
        CRepository* repository = NULL;
        TRAPD(err, repository = CRepository::NewL(KUidRepository););
        CleanupStack::PushL(repository);
        // test if an error has occurred because the repository
        // has not been set up: see instructions at the top
        // of this file if this occurs.
        if (err == KErrNotFound) 
                {
                iConsole->Printf(KErr); 
                }
        User::LeaveIfError(err);
        User::LeaveIfError(err = repository->Reset());
        CleanupStack::PopAndDestroy(repository);
        }
        
void CCentRepExample::OpenRepositoryL()
        {
        TInt i, k;
        TReal j;
        TBuf<50> tooShort;
        iConsole->Printf(KOpen);
        iRepository = CRepository::NewL(KUidRepository);
        
        User::LeaveIfError(iRepository->Get(KInt1, i));
        iConsole->Printf(KInt,i);

        User::LeaveIfError(iRepository->Get(KReal1, j));
        iConsole->Printf(KReal,j);
        
        User::LeaveIfError(iRepository->Get(KInt3, k));
        iConsole->Printf(KInteg,k);
        
        User::LeaveIfError(iRepository->Get(KString1, tooShort));
        iConsole->Printf(KString1_UpdatedValue,tooShort.PtrZ());
        
        iConsole->Printf(KPressAKey);
        iConsole->Getch();
                
        }
        
void CCentRepExample::ChangeSettingsL()
        {
        iConsole->Printf(KChangeSet);
        User::LeaveIfError(iRepository->Set(KNonExistentSetting, 10));
        
        User::LeaveIfError(iRepository->Set(KInt1, KInt1_UpdatedValue));
        
        User::LeaveIfError(iRepository->Set(KReal1, KReal1_InitialValue));
                
        User::LeaveIfError(iRepository->Set(KInt3, KInt1_InitialValue));

        User::LeaveIfError(iRepository->Set(KString1, KStringName));

        }
        
void CCentRepExample::ReadSettingsL()
        {
        TInt m, i, k;
        TReal j;
        TBuf<50> tooShort;
        iConsole->Printf(KReadSet);
        
        User::LeaveIfError(iRepository->Get(KNonExistentSetting, m));

        iConsole->Printf(KNonExisting,m);
        
        User::LeaveIfError(iRepository->Get(KInt1, i));
        
        iConsole->Printf(KInt,i);

        User::LeaveIfError(iRepository->Get(KReal1, j));

        iConsole->Printf(KReal,j);
        
        User::LeaveIfError(iRepository->Get(KInt3, k));
        
        iConsole->Printf(KInteg,k);
        
        User::LeaveIfError(iRepository->Get(KString1, tooShort));
        
        iConsole->Printf(KString1_UpdatedValue,tooShort.PtrZ());
        
        iConsole->Printf(KPressAKey);
        iConsole->Getch();

        }
        
void CCentRepExample::FindSettingsL()
        {
        RArray<TUint32> foundIds;

        // Finds all the settings that exist and match the specification 
        //given by partialKey and mask. 
        iConsole->Printf(KFind);
        
        // These values will instruct Find to return the all settings keys which 
        //match the pattern 000001XXh where X indicates a ‘don’t care’ state.
        
        User::LeaveIfError(iRepository->FindL(0x100 /*partialKey*/, 0xF00/*mask*/, foundIds));
 
        iConsole->Printf(KIdsFound,foundIds.Count()); 
        foundIds.Reset();

        // Finds all the settings that contain a given integer and 
        //match the specification given by partialKey and mask. 

        User::LeaveIfError(iRepository->FindEqL(0x00/*partialKey*/, 0x00/*mask*/,KInt1_InitialValue /*integer value*/, foundIds));
        
        iConsole->Printf(KIdsFound,foundIds.Count()); 
        foundIds.Reset();

        // Finds all the settings that contain the given floating point value 
        //and match the specification given by partialKey and mask. 
        User::LeaveIfError(iRepository->FindEqL(0x00, 0x00,KReal1_InitialValue/*Real value*/, foundIds));

        iConsole->Printf(KIdsFound,foundIds.Count());
        foundIds.Reset();

        // Finds all the settings that contain a given string value 
        //and match the specification given by partialKey and mask. 
        
        User::LeaveIfError(iRepository->FindEqL(0x00, 0x00, KStringName/*string*/, foundIds));

        iConsole->Printf(KIdsFound,foundIds.Count()); 
        foundIds.Reset();

        // Finds all the settings that match the specification given 
        // by partialKey and mask, but are either not integer values or 
        //do not have the given value. 
        
        User::LeaveIfError(iRepository->FindNeqL(0x00/*partial key*/, 0x00/*mask*/, KInt1_UpdatedValue, foundIds));
        
        iConsole->Printf(KIdsFound,foundIds.Count()); 
        foundIds.Reset();

        // Finds all the settings that match the specification given by 
        //partialKey and mask, but are either not floating point values 
        //or do not have the given value.
        
        User::LeaveIfError(iRepository->FindNeqL(0x100, 0x0F0, KReal1_UpdatedValue, foundIds));
        
        iConsole->Printf(KIdsFound,foundIds.Count()); 
        foundIds.Reset();
        
        }
void CCentRepExample::ResetAndNotifyL()
        {
        TInt x;
        
        // Ensure KInt1 is set to a different value to its initial value
        // First change to setting should cause notification
        iConsole->Printf(KReset);
        
        User::LeaveIfError(iRepository->Set(KInt1, KInt1_InitialValue+10));

        
        User::LeaveIfError(iRepository->Get(KInt1, x));
        
        iConsole->Printf(KIntBefore, x);
        
        CAsyncWaiter* waiter = CAsyncWaiter::NewL();
        CleanupStack::PushL(waiter);
        
        User::LeaveIfError(iRepository->NotifyRequest(KInt1, waiter->iStatus));
        
        // Get a notification on a reset as well
        
        User::LeaveIfError(iRepository->Reset(KInt1));
        
        // Check we got a notification
        waiter->StartAndWait();
        User::LeaveIfError(waiter->Result());
        
        // Check KInt1 now has the right value
        User::LeaveIfError(iRepository->Get(KInt1, x));
        iConsole->Printf(KIntAfter, x);

        CleanupStack::PopAndDestroy(waiter);
        }
        
void CCentRepExample::MoveSettingsL()
        {
        TUint32 keyInfo;
                
        iConsole->Printf(KMove);
        iConsole->Printf(KPressAKey);
        iConsole->Getch();
        // Move the key to the target position
        User::LeaveIfError(iRepository->Move(KInt3, KMoveTarget, 0xFFFFFFFF,
                        keyInfo));
        }       
        
void CCentRepExample::TransactionFuncL()
        {
        TUint32 keyId;
        TInt intVal;
        
        iConsole->Printf(KTransact);
        
        // Attempts to start a read write transaction.
        User::LeaveIfError(iRepository->StartTransaction(CRepository::EReadWriteTransaction));
        
        // Calls FailTransaction if activated by a Leave or PopAndDestroy.
        iRepository->CleanupCancelTransactionPushL();

        // Creating the variable KNewInt at 0x16
        const TUint32 KNewInt = 0x16;
        const TInt KIntValue = 1201;
        intVal = KIntValue +33;
        
        // Perform some write operations.
        // Creating KNewInt with the value KIntValue.
        User::LeaveIfError(iRepository->Create(KNewInt, KIntValue));
        // Setting KNewInt to the new value
        User::LeaveIfError(iRepository->Set(KNewInt,intVal));
        
        // Persistence of all values read and written during the transaction 
        // is only guaranteed after a successful return from CommitTransaction.
        User::LeaveIfError(iRepository->CommitTransaction(keyId));
        
        // Read the data written.
        User::LeaveIfError(iRepository->Get(KNewInt, intVal));
        
        // Deleting the data after reading it.
        User::LeaveIfError(iRepository->Delete(KNewInt));
        CleanupStack::Pop(); 

        CRepository* repository1;
        User::LeaveIfNull(repository1 = CRepository::NewLC(KUidRepository));
        
        // Begin read transaction for repository1
        User::LeaveIfError(repository1->StartTransaction(CRepository::EReadTransaction));
        
        CRepository* repository2;
        User::LeaveIfNull(repository2 = CRepository::NewLC(KUidRepository));
        
        // Should be able to start another read transaction (Multiple read transactions)
        User::LeaveIfError(repository2->StartTransaction(CRepository::EReadTransaction));
        
        // Perform some gets using the open transactions and repositories
        // Read operation
        User::LeaveIfError(repository1->Get(KInt1, intVal));
        // Ensure transaction cancelled if following code Leaves:
    repository1->CleanupCancelTransactionPushL();
    
    // Commit the transaction 
    User::LeaveIfError(repository1->CommitTransaction(keyId));
    CleanupStack::Pop(); 
        
        // Calls FailTransaction if activated by a Leave or PopAndDestroy.
        repository2->CleanupCancelTransactionPushL();
        User::LeaveIfError(repository2->Get(KInt1, intVal));
        User::LeaveIfError(repository2->CommitTransaction(keyId));
        
        // Pop the transaction
        CleanupStack::Pop();
        CleanupStack::PopAndDestroy(2,repository1);
        

        }
        
void CCentRepExample::DeleteL()
        {
        TInt x;
        TReal y;
        
        iConsole->Printf(KDelete);
                        
        User::LeaveIfError(iRepository->Get(KInt1_InitialValue, x));
        User::LeaveIfError(iRepository->Get(KReal1, y));
        User::LeaveIfError(iRepository->Delete(KInt1_InitialValue));
        User::LeaveIfError(iRepository->Delete(KMoveTarget));
        User::LeaveIfError(iRepository->Delete(KReal1));
        }
                                
LOCAL_C void MainL()
        {
        // Create an Active Scheduler to handle asychronous calls
        CActiveScheduler* scheduler = new (ELeave) CActiveScheduler;
        CleanupStack::PushL(scheduler);
        CActiveScheduler::Install( scheduler );
        CCentRepExample * app = CCentRepExample ::NewLC();

        // Reset the repository
        app->ResetL();
        
        // Open the repository
        app->OpenRepositoryL();
        
        // Change the existing settings
        app->ChangeSettingsL();
        
        // Read the changed settings
        app->ReadSettingsL();
        
        // Find the settings using FindL, FindEqL and FindNeqL
        app->FindSettingsL();
        
        // Move settings
        app->MoveSettingsL();
        
        // Reset settings to default values and get notification
        app->ResetAndNotifyL();

        // Perform multiple operations in a transaction
        app->TransactionFuncL();
        
        // Delete settings
        app->DeleteL();
        
        CleanupStack::PopAndDestroy(2); //app, scheduler

        }

GLDEF_C TInt E32Main()
        {
    __UHEAP_MARK;
    CTrapCleanup* cleanup = CTrapCleanup::New();
    if(cleanup == NULL)
        {
        return KErrNoMemory;
        }
    TRAPD(err, MainL());
        if(err != KErrNone)
                {
                User::Panic(_L("Failed to complete"),err);
                }

    delete cleanup;
    __UHEAP_MARKEND;
    return KErrNone;
        }

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Copyright ©2010 Nokia Corporation and/or its subsidiary(-ies).
All rights reserved. Unless otherwise stated, these materials are provided under the terms of the Eclipse Public License v1.0.