// Copyright (c) 1998-2009 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:

//

#include "t_dbstress.h"

const TInt KCashLimit=500;

const TInt KOverdraftLimit=100;

const TInt KMinHeap=0x2000;

const TInt KMaxHeap=0x20000;

#ifdef _DEBUG

const TInt KAllocFailRate=1000;

#endif

LOCAL_D TBuf<256> Sql;

LOCAL_D	TBuf8<256> LogBuf;

class CThread : public CBase

	{

public:

	static TInt Entry(TAny*);

protected:

	CThread() {}

	~CThread();

private:

	static void EntryL();

	void GoL();

	void ConstructL();

	void OpenViewsL();

	void RecoverL();

	void CompactL();

	void Rollback();

	void Reset();

	void WorkL();

	void TransactionL();

	void AccountL(TInt anAccount);

	void StatementTimeL();

	void VerifyL();

//

	void LogSize();

private:

	RFs iFs;

	RFile iLog;

	CFileStore* iStore;

	RDbStoreDatabase iData;

	TBool iOpen;

	RDbView iAccs;

	RDbView iTrans;

	TInt iError;

	TInt iPoint;

	};

GLDEF_C TInt StartThread(RThread& aThread,TRequestStatus& aStat)

	{

	TInt r=aThread.Create(_L("Thread"),CThread::Entry,KDefaultStackSize,KMinHeap,KMaxHeap,NULL);

	if (r==KErrNone)

		{

		aThread.SetPriority(EPriorityLess);

		aThread.Logon(aStat);

		aThread.Resume();

		RunTimer.Start();

		}

	return r;

	}

TInt CThread::Entry(TAny*)

	{

	CTrapCleanup* cleanup=CTrapCleanup::New();

	if (cleanup==NULL)

		return KErrNoMemory;

	TRAPD(r,EntryL());

	delete cleanup;

	return r;

	}

void CThread::EntryL()

	{

	CThread* self=new(ELeave) CThread;

	CleanupStack::PushL(self);

	self->ConstructL();

	self->GoL();		// never returns

	}

CThread::~CThread()

	{//The destructor is never ever executed! See CThread::EntryL() for details!

	iAccs.Close();

	iTrans.Close();

	iData.Close();

	delete iStore;

	iLog.Close();

	TInt err = iFs.Delete(KLogFile);

	if(err != KErrNone)

		{

		RDebug::Print(_L("Error %d deleting \"%S\" file.\n"), err, &KLogFile);

		}

	iFs.Close();

	}

void CThread::ConstructL()

	{

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

	User::LeaveIfError(iFs.SetSessionPath(KTestDir));

	User::LeaveIfError(iLog.Replace(iFs,KLogFile,EFileWrite|EFileStreamText));

	LogSize();

	iData.OpenL(iStore,iStore->Root());

	}

//

// Never exits

//

void CThread::GoL()

	{

	__UHEAP_SETFAIL(RHeap::ETrueRandom,KAllocFailRate);

	for (;;)

		{

		TRAPD(r,WorkL());

		NewCount=OldCount;

		LogBuf.Format(_L8(" *** Point %d with code %d"),iPoint,r);

		iLog.Write(LogBuf);

		LogSize();

		iError=r;

		Rollback();

		LogSize();

		if (r==KErrDiskFull)

			User::Leave(r);

		}

	}

//

// Report the file size

//

void CThread::LogSize()

	{

	TInt size;

	if (iStore->File().Size(size)==KErrNone)

		{

		LogBuf.Format(_L8("\nFile size=%d"),size);

		iLog.Write(LogBuf);

		}

	}

void CThread::Rollback()

	{

	if (iOpen)

		{

		iLog.Write(_L8("\nCancel"));

		iAccs.Cancel();

		iTrans.Cancel();

		}

	if (iData.InTransaction())

		{

		iLog.Write(_L8("\nRollback"));

		iData.Rollback();

		}

	}

void CThread::Reset()

	{

	iLog.Write(_L8("\nReset"));

	TEST(iOpen);

	iAccs.Reset();

	iTrans.Reset();

	}

void CThread::RecoverL()

	{

	iPoint=70;

	User::LeaveIfError(iLog.Write(_L8("\nRecovering")));

	if (iOpen)

		{

		iAccs.Close();

		iTrans.Close();

		iOpen=EFalse;

		}

	User::LeaveIfError(iData.Recover());

	}

void CThread::CompactL()

	{

	iPoint=90;

	User::LeaveIfError(iLog.Write(_L8("\nCompacting")));

	TInt b=iStore->ReclaimL();

	b-=iStore->CompactL();

	iStore->CommitL();

	LogBuf.Format(_L8(": %d bytes reclaimed"),b);

	User::LeaveIfError(iLog.Write(LogBuf));

	}

void CThread::OpenViewsL()

	{

	iPoint=80;

	User::LeaveIfError(iLog.Write(_L8("\nOpening")));

	User::LeaveIfError(iAccs.Prepare(iData,_L("select id,balance,statement_balance from accounts")));

	TInt r=iTrans.Prepare(iData,_L("select t_date,from_id,to_id,amount from transactions"));

	if (r!=KErrNone)

		{

		iAccs.Close();

		User::Leave(r);

		}

	iOpen=ETrue;

	}

void CThread::WorkL()

	{

	iPoint=0;

	switch (iError)

		{

	case KErrDied:

		Rollback();

		break;

	case KErrNotReady:

		Reset();

		break;

	case KErrCorrupt:

		RecoverL();

		break;

		}

	iPoint=1;

	for (;;)

		{

		LogSize();

		if (!iOpen)

			OpenViewsL();

		switch (Random(100))

			{

		case 0:	case 1:

			StatementTimeL();

			break;

		case 2: case 3:

			RecoverL();

			break;

		case 4: // case 5: case 6: case 7: case 8: case 9:

			CompactL();

			break;

		default:

			TransactionL();

			break;

			}

		}

	}

void CThread::AccountL(TInt anAccount)

	{

	Sql.Format(_L("id=%d"),anAccount);

	iAccs.FirstL();

	TEST(iAccs.FindL(iAccs.EForwards,Sql)>=0);

	}

//

// generate and add a single transaction

//

void CThread::TransactionL()

	{

	iPoint=2;

	User::LeaveIfError(iLog.Write(_L8("\nTransaction")));

	TInt from;

	if (Random(3)==0)

		from=ECash;

	else

		from=Random(KAccountIDs);

	TInt to=(Random(KAccountIDs-1)+from+1)%KAccountIDs;

	AccountL(from);

	iAccs.GetL();

	TEST(iAccs.ColInt(1)==from);

	TInt avail=iAccs.ColInt(2)+KOverdraftLimit;

	TInt amount;

	if (to==ECash)

		{

		if (avail<10)

			return;

		amount=10*(1+Random(Min(avail,KCashLimit)/10));

		}

	else

		{

		amount=1+Random(100);

		if (Random(100)<5)

			amount*=10;

		if (Random(100)<5)

			amount*=10;

		while (amount>avail)

			amount/=4;

		if (amount==0)

			return;

		}

	iPoint=3;

	LogBuf.Format(_L8(" %08d: %d -> %d, %5d"),++TransId,from,to,amount);

	User::LeaveIfError(iLog.Write(LogBuf));

	iPoint=4;

	iData.Begin();

	iTrans.InsertL();

	iTrans.SetColL(1,TransId);

	iTrans.SetColL(2,from);

	iTrans.SetColL(3,to);

	iTrans.SetColL(4,amount);

	iPoint=5;

	iTrans.PutL();

	iPoint=6;

	iAccs.UpdateL();	// from

	TInt frombalance=iAccs.ColInt(2)-amount;

	iAccs.SetColL(2,frombalance);

	iPoint=7;

	iAccs.PutL();

	iPoint=8;

	AccountL(to);

	iPoint=9;

	iAccs.UpdateL();	// to

	TInt tobalance=iAccs.ColInt(2)+amount;

	iAccs.SetColL(2,tobalance);

	iPoint=10;

	iAccs.PutL();

	iPoint=11;

// this will invoke commit, so update counts now

	NewCount=OldCount+1;

	TInt r=iData.Commit();

	if (r!=KErrNone)

		{

		NewCount=OldCount;

		User::Leave(r);

		}

// succeeded

	OldCount=NewCount;

	LogBuf.Format(_L8("; [%d,%d]"),frombalance,tobalance);

	iLog.Write(LogBuf);

	}

//

// deliver statements

//

void CThread::StatementTimeL()

	{

	iPoint=50;

	User::LeaveIfError(iLog.Write(_L8("\nStatement")));

	iPoint=51;

	VerifyL();

	// discard transactions

	iPoint=52;

	iData.Begin();

	for (iTrans.BeginningL();iTrans.NextL();)

		iTrans.DeleteL();

	for (iAccs.BeginningL();iAccs.NextL();)

		{

		iAccs.UpdateL();

		iAccs.SetColL(3,iAccs.ColInt(2));	// set statement balance

		iAccs.PutL();

		}

	iPoint=53;

	NewCount=0;

	TInt r=iData.Commit();

	if (r!=KErrNone)

		{

		NewCount=OldCount;

		User::Leave(r);

		}

	OldCount=NewCount;

	}

void CThread::VerifyL()

	{

	TInt balance[KAccountIDs];

	TEST(iAccs.CountL()==KAccountIDs);

	for (iAccs.BeginningL();iAccs.NextL();)

		{

		iAccs.GetL();

		TInt id=iAccs.ColInt(1);

		balance[id]=iAccs.ColInt(3);

		}

	TInt transact=0;

	for (iTrans.BeginningL();iTrans.NextL();)

		{

		++transact;

		iTrans.GetL();

		TInt from=iTrans.ColInt(2);

		TInt to=iTrans.ColInt(3);

		TInt amount=iTrans.ColInt(4);

		balance[from]-=amount;

		balance[to]+=amount;

		}

	TEST(transact==iTrans.CountL());

	for (iAccs.BeginningL();iAccs.NextL();)

		{

		iAccs.GetL();

		TInt id=iAccs.ColInt(1);

		if (balance[id]!=iAccs.ColInt(2))

			User::Panic(_L("Oh-oh"),4321);

		}

	}