examples/Base/MemMan/Cleanup/SimpleOOM/SimpleOOM.cpp

/*
Copyright (c) 2000-2010 Nokia Corporation and/or its subsidiary(-ies). All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

* Redistributions of source code must retain the above copyright notice, this
  list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
  this list of conditions and the following disclaimer in the documentation
  and/or other materials provided with the distribution.
* Neither the name of Nokia Corporation nor the names of its contributors
  may be used to endorse or promote products derived from this software
  without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Description:  
Example checks the robustness of a simple class on Out Of Memory (OOM)
NOTE: the structure of this example is different to standard E32 examples
*/



#include <e32cons.h>



  // All messages written to this
LOCAL_D CConsoleBase* console;
  
  // Function prototypes
LOCAL_C void doExampleL();      
LOCAL_C void callExampleL();


//
// -----> CSimple (definition)
//
class CSimple : public CBase
        {
public :
        static CSimple* NewL(TInt aVal);
        static CSimple* NewLC(TInt aVal);
        void   Display();
protected: 
        CSimple(TInt aVal);
public: 
        TInt   iVal;
        };


//
// -----> CSimple (implementation)
//
CSimple* CSimple::NewL(TInt aVal) 
        {
          // NB The NewL function uses the C++ constructor mechanism.
        CSimple* self=new (ELeave) CSimple(aVal);
        return self;
        }

                                
CSimple* CSimple::NewLC(TInt aVal)
        {
          // NewLC is enriched with a push to the cleanup stack
        CSimple* self=NewL(aVal);       
        CleanupStack::PushL(self);
        return self;
        }

                                
void CSimple::Display() 
        {
          // Display class data member on the console.
        _LIT(KFormat1,"Value=%d.\n");
        console->Printf(KFormat1,iVal);
        }
 
CSimple::CSimple(TInt aVal) 
        : iVal(aVal)
        {}


//
// Main function called by E32
//
GLDEF_C TInt E32Main()
    {
          // Get cleanup stack
        CTrapCleanup* cleanup=CTrapCleanup::New();

          // Some more initialization, then do the example
        TRAPD(error,callExampleL());
          
          // callExampleL() should never leave.
        _LIT(KMsgPanicEpoc32ex,"EPOC32EX");
        __ASSERT_ALWAYS(!error,User::Panic(KMsgPanicEpoc32ex,error));

          // destroy the cleanup stack
        delete cleanup;
        
          // return
        return 0;
    }


//
//
//
LOCAL_C void callExampleL() 
    {
          // Initialize and call the example code under cleanup stack.
        _LIT(KMsgExampleCode,"Symbian platform Example Code");
        console = Console::NewL(KMsgExampleCode,TSize(KConsFullScreen,KConsFullScreen));
          // Put console onto the cleanup stack.
        CleanupStack::PushL(console);

          // Mark for alloc heaven tool
        __UHEAP_MARK;                      

          // Perform the example function under the protection of a 
          // TRAP harness.
        TRAPD(error,doExampleL());
        
          // Test the example for alloc heaven
          __UHEAP_MARKEND;

          // 
        _LIT(KMsgOK,"ok");
        _LIT(KFormat2,"Overall example Trap Harness failed: leave code=%d");
        if (error)
                console->Printf(KFormat2, error);
        else
                console->Printf(KMsgOK);
          
          // Continue
        _LIT(KMsgPressAnyKey," [press any key]");
        console->Printf(KMsgPressAnyKey);
        console->Getch();

          // Remove the console object from the cleanupstack
          // and destroy it. 
        CleanupStack::PopAndDestroy();
    }


//
// Do the example
//
// Example checks the robustness of class on OOM
void doExampleL()
        {
          // Start up the allocation failure tool to fail 
          // in the third cycle (arg=3 as there is 1 new
          // per cycle)
        __UHEAP_SETFAIL(RHeap::EDeterministic,3);
        
        for(TInt ii=1;ii<4;ii++)
                {
                  // Display status information
                _LIT(KFormat3,"Cycle %d.\n");
                console->Printf(KFormat3,ii);
                  // Create new instance
                CSimple* mySimpleExample = CSimple::NewL(2);
                  // Display the instance
                mySimpleExample->Display();
                  // Destroy the instance
                delete mySimpleExample;
                }
        }

---