--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/camerauis/cameraxui/cxengine/src/cxememorymonitorprivate.cpp	Thu May 13 21:30:19 2010 +0300
@@ -0,0 +1,147 @@
+/*
+* Copyright (c) 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 <hal.h>
+
+#include "cxutils.h"
+#include "cxenamespace.h"
+#include "cxefeaturemanager.h"
+#include "cxememorymonitorprivate.h"
+
+namespace
+{
+    const int FREEING_RETRIES = 2;
+    const int MONITORING_INTERVAL = 10*1000; // in milliseconds
+}
+
+/*!
+* Constructor
+*/
+CxeMemoryMonitorPrivate::CxeMemoryMonitorPrivate(CxeFeatureManager &features)
+    : mFeatures(features)
+{
+    CX_DEBUG_ENTER_FUNCTION();
+
+    mFeatures.configuredValues(CxeRuntimeKeys::FREE_MEMORY_LEVELS, mLevels);
+
+    CX_DEBUG(("CxeMemoryMonitorPrivate - trigger level: %d bytes", mLevels.value(Cxe::FreeMemoryTrigger)));
+    CX_DEBUG(("CxeMemoryMonitorPrivate - target level:  %d bytes", mLevels.value(Cxe::FreeMemoryTarget)));
+
+#ifdef Q_OS_SYMBIAN
+    // Request free memory as defined in Feature Manager.
+    // If we cannot have enough free memory, throw error.
+    bool ok = requestFreeMemory(mLevels.value(Cxe::FreeMemoryTarget));
+    qt_symbian_throwIfError(ok ? KErrNone : KErrNoMemory);
+#endif // Q_OS_SYMBIAN
+
+    CX_DEBUG_EXIT_FUNCTION();
+}
+
+/*!
+* Destructor
+*/
+CxeMemoryMonitorPrivate::~CxeMemoryMonitorPrivate()
+{
+    CX_DEBUG_ENTER_FUNCTION();
+    stopMonitoring();
+    CX_DEBUG_EXIT_FUNCTION();
+}
+
+
+/*!
+* Get the amount of free memory (RAM).
+* @return Free RAM in bytes.
+*/
+int CxeMemoryMonitorPrivate::free() const
+{
+#ifdef Q_OS_SYMBIAN
+    int ram(0);
+    HAL::Get(HALData::EMemoryRAMFree, ram);
+    return ram;
+#else
+    //!@todo: real implementation for desktop etc?
+    return 1024*1024*1024;
+#endif // Q_OS_SYMBIAN
+}
+
+
+/*!
+* Request to free memory (RAM) to achieve asked level.
+* @param required Required free memory after this call.
+* @return Was it possible to achieve the required level of free memory.
+*/
+bool CxeMemoryMonitorPrivate::requestFreeMemory(int required)
+{
+    CX_DEBUG_ENTER_FUNCTION();
+
+    if (free() < required) {
+#ifdef Q_OS_SYMBIAN
+    qt_symbian_throwIfError(mOomMonitor.Connect());
+
+    int i(0);
+    int status(KErrGeneral);
+    do {
+        status = mOomMonitor.RequestFreeMemory(required);
+    } while (status != KErrNone && ++i < FREEING_RETRIES);
+
+    mOomMonitor.Close();
+#endif // Q_OS_SYMBIAN
+    }
+
+    // If we have the free RAM we were asked for, all good.
+    bool ok = free() >= required;
+
+    CX_DEBUG_EXIT_FUNCTION();
+    return ok;
+}
+
+/*!
+* Start monitoring free memory.
+*/
+void CxeMemoryMonitorPrivate::startMonitoring()
+{
+    if (!mTimer.isActive()) {
+        connect(&mTimer, SIGNAL(timeout()), this, SLOT(checkMemory()), Qt::UniqueConnection);
+        mTimer.start(MONITORING_INTERVAL);
+    }
+}
+
+/*!
+* Stop monitoring free memory.
+*/
+void CxeMemoryMonitorPrivate::stopMonitoring()
+{
+    mTimer.stop();
+}
+
+/*!
+* Check free memory. Try to release memory if below trigger level.
+*/
+void CxeMemoryMonitorPrivate::checkMemory()
+{
+    CX_DEBUG_ENTER_FUNCTION();
+
+    if(free() < mLevels.value(Cxe::FreeMemoryTrigger)) {
+        // Memory too low, request more free memory.
+        CX_DEBUG(("[WARNING] CxeMemoryMonitorPrivate - memory low, requesting more.."));
+        requestFreeMemory(mLevels.value(Cxe::FreeMemoryTarget));
+    }
+    CX_DEBUG_EXIT_FUNCTION();
+}
+
+
+// end of file