/*

* Copyright (c) 2010 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: 

*

*/

// INCLUDE FILES

#include "loadgen_memoryeat.h"

#include "loadgen_utils.h"

#include "loadgen.hrh"

#include "loadgen_traces.h"

#include <loadgen.rsg>

#include <e32math.h>

_LIT(KThreadName, "MemEat %d");

_LIT(KChunkName, "LoadGen %d");

_LIT(KFilePath, "%c:\\system\\temp\\LoadGen-%d_%d.$$$");

// currently can only handle 2GB

const TInt64 KMaxEatSize = 2147483647;

const TInt KDefaultStart = 50;

const TInt KDefaultPeriod = 5000000;

// ===================================== MEMBER FUNCTIONS =====================================

CMemoryEat* CMemoryEat::NewL(TMemoryEatAttributes& aAttributes, TInt aReferenceNumber)

    {

    CMemoryEat* self = new(ELeave) CMemoryEat(aAttributes, aReferenceNumber);

    CleanupStack::PushL(self);

    self->ConstructL();

    CleanupStack::Pop(self);

    return self;    

    }

// --------------------------------------------------------------------------------------------

CMemoryEat::~CMemoryEat()

    {

    Close();

    }

// --------------------------------------------------------------------------------------------

CMemoryEat::CMemoryEat(TMemoryEatAttributes& aAttributes, TInt aReferenceNumber) : iAttributes(aAttributes)

    {

    iAttributes.iId = aReferenceNumber;

    }

// --------------------------------------------------------------------------------------------

void CMemoryEat::ConstructL()

    {

    CLoadBase::ConstructL();

    iType = ELoadGenCmdNewLoadEatMemory;

    TBuf<64> threadName;

    threadName.Format(KThreadName, iAttributes.iId);

    // create a thread

    User::LeaveIfError(iThread.Create(threadName, ThreadFunction, KDefaultStackSize*2, KMinHeapSize, 32*1024*KMinHeapSize, (TAny*) &iAttributes ));

    // set priority of the thread

    SetPriority();

    }

// --------------------------------------------------------------------------------------------

TInt CMemoryEat::ThreadFunction(TAny* aThreadArg)

    {

    CTrapCleanup* pC = CTrapCleanup::New();

    CActiveScheduler* pS = new CActiveScheduler;

    CActiveScheduler::Install(pS);

    // start memory eat, pass pointer to arguments

    GenerateLoad(*((TMemoryEatAttributes*) aThreadArg));

    delete pS;

    delete pC;

    return KErrNone;

    }

// --------------------------------------------------------------------------------------------

void CMemoryEat::GenerateLoad(TMemoryEatAttributes& aAttributes)

    {

    CMemoryEatManager* memoryEatManager = NULL;

    TRAPD(err, memoryEatManager = CMemoryEatManager::NewL(aAttributes));

    if (err == KErrNone) CActiveScheduler::Start();

    delete memoryEatManager;

    }

// --------------------------------------------------------------------------------------------

void CMemoryEat::Resume()

    {

    CLoadBase::Resume();

    iThread.Resume();

    }

// --------------------------------------------------------------------------------------------

void CMemoryEat::Suspend()

    {

    CLoadBase::Suspend();

    iThread.Suspend();

    }

// --------------------------------------------------------------------------------------------

void CMemoryEat::SetPriority()

    {

    CLoadBase::SetPriority();

    iThread.SetPriority(CLoadGenUtils::SettingItemToThreadPriority(iAttributes.iPriority));

    }

// --------------------------------------------------------------------------------------------

void CMemoryEat::Close()

    {

    CLoadBase::Close();

    if (iThread.ExitReason() == 0) // check if the thread is still alive

        {

        // signal the thread that it needs to close

        iThread.RequestComplete(iAttributes.iDeathStatus, KErrCancel);

        // wait the thread to die

        TRequestStatus waiter;

        iThread.Logon(waiter);

        User::WaitForRequest(waiter);

        iThread.Close();

        }

    }

// --------------------------------------------------------------------------------------------

TPtrC CMemoryEat::Description()

    {

    TBuf<256> buf;

    TBuf<16> prioBuf;

    CLoadGenUtils::SettingItemToThreadDescription(iAttributes.iPriority, prioBuf);

    TBuf<16> srcBuf;

    CLoadGenUtils::SettingItemToSourceDescription(iAttributes.iSource, srcBuf);

    if (iAttributes.iType == EMemoryEatTypeMemoryToEat)

        {

        _LIT(KMemoryEatEntryMemoryToEat, "[%d] MemEat src=%S prio=%S type=MemToEat amount=%LDB buf=%dB idle=%dms");

        buf.Format(KMemoryEatEntryMemoryToEat, iAttributes.iId, &srcBuf, &prioBuf, iAttributes.iAmount, iAttributes.iBuffer, iAttributes.iIdle);

        }

    else if (iAttributes.iType == EMemoryEatTypeMemoryToBeLeft)

        {

        _LIT(KMemoryEatEntryMemoryToBeLeft, "[%d] MemEat src=%S prio=%S type=MemToBeLeft amount=%LDB buf=%dB idle=%dms");

        buf.Format(KMemoryEatEntryMemoryToBeLeft, iAttributes.iId, &srcBuf, &prioBuf, iAttributes.iAmount, iAttributes.iBuffer, iAttributes.iIdle);

        }        

    else if (iAttributes.iType == EMemoryEatTypeWavy)

        {

        _LIT(KMemoryEatEntryRandom, "[%d] MemEat src=%S prio=%S type=Random min=%LDB max=%LDB buf=%dB idle=%dms");

        buf.Format(KMemoryEatEntryRandom, iAttributes.iId, &srcBuf, &prioBuf, iAttributes.iRandomMin, iAttributes.iRandomMax, iAttributes.iBuffer, iAttributes.iIdle);

        } 

    return TPtrC(buf);

    }               

// --------------------------------------------------------------------------------------------

// --------------------------------------------------------------------------------------------

CMemoryEatManager* CMemoryEatManager::NewL(TMemoryEatAttributes& aAttributes)

    {

    CMemoryEatManager* self = new(ELeave) CMemoryEatManager(aAttributes);

    CleanupStack::PushL(self);

    self->ConstructL();

    CleanupStack::Pop();

    return self;

    }

// --------------------------------------------------------------------------------------------

CMemoryEatManager::CMemoryEatManager(TMemoryEatAttributes& aAttributes) :

    CActive(EPriorityStandard), iAttributes(aAttributes)

    {

    }

// --------------------------------------------------------------------------------------------

CMemoryEatManager::~CMemoryEatManager()

    {

    Cancel();

    DestroyMemoryEat();

    }

// --------------------------------------------------------------------------------------------

void CMemoryEatManager::ConstructL()

    {

    CActiveScheduler::Add(this);

    // set the status as pending

    iStatus = KRequestPending;

    SetActive();

    // set the death status pointer point to the request status of this ao

    iAttributes.iDeathStatus = &iStatus;

    // init

    InitMemoryEatL();

    // start timer    

    iPeriodicTimer = CPeriodic::NewL(CActive::EPriorityStandard);

    iPeriodicTimer->Start(KDefaultStart, KDefaultPeriod, TCallBack(PeriodicTimerCallBack, this));

    }

// --------------------------------------------------------------------------------------------

void CMemoryEatManager::RunL()

    {

    // request status has completed by the main thread meaning that we need to stop now

    CActiveScheduler::Stop();

    }

// --------------------------------------------------------------------------------------------

void CMemoryEatManager::DoCancel()

    {

    }

// --------------------------------------------------------------------------------------------

TInt CMemoryEatManager::PeriodicTimerCallBack(TAny* aAny)

    {

    TInt result = KErrNone;

    CMemoryEatManager* self = static_cast<CMemoryEatManager*>( aAny );

    self->iPeriodicTimer->Cancel();

    TRAP( result, self->EatMemoryL() );

    return result;

    }

// --------------------------------------------------------------------------------------------

void CMemoryEatManager::InitMemoryEatL()

    {

    // create a chunk for RAM

    if (iAttributes.iSource == EMemoryEatSourceTypeRAM)

        {

        TBuf<64> chunkName;

        chunkName.Format(KChunkName, iAttributes.iId);

        // set max size of the chunk to be size of the RAM memory

        TMemoryInfoV1Buf ramMemory;

        UserHal::MemoryInfo(ramMemory);

        User::LeaveIfError( iEatChunk.CreateGlobal(chunkName, 0, ramMemory().iMaxFreeRamInBytes-1, EOwnerThread) );

        }

    // create a temporary file to disk

    else

        {

        // connect to RFs

        User::LeaveIfError( iFs.Connect() );

        iFilesCounter = 0;

        TFileName eatFileName;

        eatFileName.Format( KFilePath, 'B'+iAttributes.iSource, iAttributes.iId, 1 );

        iFs.MkDirAll( eatFileName );

        User::LeaveIfError( iEatFile.Replace( iFs, eatFileName, EFileWrite ) );

        iFilesCounter++;        

        } 

    iWavyEatMoreMemory = ETrue;

    }

// --------------------------------------------------------------------------------------------

void CMemoryEatManager::DestroyMemoryEat()

    {

    if (iAttributes.iSource == EMemoryEatSourceTypeRAM)

        {

        iEatChunk.Adjust(0);

        iEatChunk.Close();

        }

    else

        {

        // close current file

        iEatFile.Flush();

        iEatFile.Close();

        // delete created files

        for ( TInt k = 1; k <= iFilesCounter; k++ )

            {            

            TFileName eatFileName;

            eatFileName.Format( KFilePath, 'B'+iAttributes.iSource, iAttributes.iId, k );

            iFs.Delete( eatFileName );

            }

        iFs.Close();

        } 

    }

// --------------------------------------------------------------------------------------------

void CMemoryEatManager::EatMemoryL()

    {

    // get current sizes

    TInt64 eatSizeNow(0);

    TInt sizeNow(0);

    TInt64 freeSystemMemory(0);

    if (iAttributes.iSource == EMemoryEatSourceTypeRAM)

        {

        eatSizeNow = iEatChunk.Size(); // get current chunk size

        }

    else

        {

        User::LeaveIfError( iEatFile.Size( sizeNow ) );

        if ( iFilesCounter > 1)

            {

            eatSizeNow += sizeNow + ( ( iFilesCounter - 1 ) * KMaxEatSize );

        	}

        else

            { 

            eatSizeNow = sizeNow ; 

            }

        }

    LOGSTRING2("Loadgen:EatMemoryL eatSizeNow = %d", eatSizeNow );

    freeSystemMemory = ReadFreeMemory();

    // eat until specific amount of memory at most amount of buffer at a time  

    if (iAttributes.iType == EMemoryEatTypeMemoryToEat)

        {

        // grow partial buffer to match exact amount 

        if ( ( iAttributes.iAmount - eatSizeNow >= 0 && 

               iAttributes.iAmount - eatSizeNow < iAttributes.iBuffer ) )

            {

               DoEatMemoryL( eatSizeNow + ( iAttributes.iAmount - eatSizeNow ) );

            }

        // grow full buffer

        else if ( eatSizeNow < iAttributes.iAmount )

            {

            DoEatMemoryL( eatSizeNow + iAttributes.iBuffer );

            }

        // shrink partial buffer to match exact amount

        else if (eatSizeNow - iAttributes.iAmount >= 0 && eatSizeNow - iAttributes.iAmount < iAttributes.iBuffer)

            {

            DoEatMemoryL(eatSizeNow - (eatSizeNow - iAttributes.iAmount));

            }                

        // shrink full buffer

        else if (eatSizeNow > iAttributes.iAmount)

            {

            DoEatMemoryL(eatSizeNow - iAttributes.iBuffer);

            }                

        }

    // eat until specific amount of free memory has been reached at most amount of buffer at a time

    else if (iAttributes.iType == EMemoryEatTypeMemoryToBeLeft)

        {

        // grow partial buffer to match exact amount

        if (freeSystemMemory - iAttributes.iAmount >= 0 && freeSystemMemory - iAttributes.iAmount < iAttributes.iBuffer)

            {

            DoEatMemoryL(eatSizeNow + (freeSystemMemory - iAttributes.iAmount));

            }

        // grow full buffer

        else if (freeSystemMemory > iAttributes.iAmount)

            {

            DoEatMemoryL(eatSizeNow + iAttributes.iBuffer);

            }

        // shrink partial buffer to match exact amount

        if (iAttributes.iAmount - freeSystemMemory >= 0 && iAttributes.iAmount - freeSystemMemory < iAttributes.iBuffer)

            {

            DoEatMemoryL(eatSizeNow - (iAttributes.iAmount - freeSystemMemory));

            }

        // shrink full buffer

        else if (freeSystemMemory < iAttributes.iAmount)

            {

            DoEatMemoryL(eatSizeNow - iAttributes.iBuffer);

            }

        }        

    // wavy memory eat

    else if (iAttributes.iType == EMemoryEatTypeWavy)

        {

        // grow to max value if not under it

        if (freeSystemMemory > iAttributes.iRandomMax)

            {

            DoEatMemoryL(eatSizeNow + (freeSystemMemory - iAttributes.iRandomMax) + iAttributes.iBuffer);

            iWavyEatMoreMemory = ETrue; // change direction

            }

        // shrink to min value if not below it

        else if (freeSystemMemory < iAttributes.iRandomMin)

            {

            DoEatMemoryL(eatSizeNow - (iAttributes.iRandomMin - freeSystemMemory) - iAttributes.iBuffer);

            iWavyEatMoreMemory = EFalse; // change direction

            }                

        // grow or shrink

        else

            {

            if (iWavyEatMoreMemory)

                {

                // grow partial buffer to match exact amount

                if (freeSystemMemory - iAttributes.iRandomMin >= 0 && freeSystemMemory - iAttributes.iRandomMin < iAttributes.iBuffer)

                    {

                    DoEatMemoryL(eatSizeNow + (freeSystemMemory - iAttributes.iRandomMin));

                    iWavyEatMoreMemory = EFalse; // change direction since limit reached

                    }

                // grow full buffer

                else

                    {

                    DoEatMemoryL(eatSizeNow + iAttributes.iBuffer);

                    }

                }

            else // shrink

                {

                // shrink partial buffer to match exact amount

                if (iAttributes.iRandomMax - freeSystemMemory >= 0 && iAttributes.iRandomMax - freeSystemMemory < iAttributes.iBuffer)

                    {

                    DoEatMemoryL(eatSizeNow - (iAttributes.iRandomMax - freeSystemMemory));

                    iWavyEatMoreMemory = ETrue; // change direction since limit reached

                    }                

                // shrink full buffer

                else

                    {

                    DoEatMemoryL(eatSizeNow - iAttributes.iBuffer);

                    }                 

                }

            }

        }

    // call timer

    iPeriodicTimer->Start(CLoadGenUtils::MilliSecondsToMicroSeconds(iAttributes.iIdle, iAttributes.iRandomVariance), KDefaultPeriod, TCallBack(PeriodicTimerCallBack, this));

    }

// --------------------------------------------------------------------------------------------

void CMemoryEatManager::DoEatMemoryL( TInt64 aNewSize )

    {

    // check that new size is in valid range

    if (aNewSize < 0)

        {

        aNewSize = 0;

        }

    // set new size

    if (iAttributes.iSource == EMemoryEatSourceTypeRAM)

        {

        TInt err = iEatChunk.Adjust( aNewSize );

        }

    else

        {

        HandleEatMemoryL( aNewSize );

        }

    }

// --------------------------------------------------------------------------------------------

void CMemoryEatManager::HandleEatMemoryL( TInt64 aNewSize )

    {

    // current size = open file size + full files sizes

    TInt currentFileSize = 0;        

    User::LeaveIfError( iEatFile.Size( currentFileSize ) );    

    TInt64 currentSize = currentFileSize + ( ( iFilesCounter - 1 ) * KMaxEatSize );

    if ( aNewSize > currentSize ) // increasing

        {

        AllocMemoryL( aNewSize );

        }

    else if ( aNewSize < currentSize )//decreasing

        {

        FreeMemoryL( aNewSize );

        }

    }

// --------------------------------------------------------------------------------------------

void CMemoryEatManager::AllocMemoryL( TInt64 aNewSize )

    {

    LOGSTRING("Loadgen: CMemoryEatManager::AllocMemoryL =>");

    // size of the file that remains open

    TInt64 sizeLeft = aNewSize % KMaxEatSize;

    // amount of the files that is needed

    TInt64 filesNeeded = aNewSize / KMaxEatSize; 

    if ( sizeLeft > 0 )

        {

        filesNeeded++;

        }

    if ( filesNeeded > iFilesCounter )

        {

        // update current file size to 2 GB

        User::LeaveIfError( iEatFile.SetSize( KMaxEatSize ) );

        // close current file

        iEatFile.Flush();