1 /*

     2 * Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description:

    15 *

    16 * This class implements general wait object for calling

    17 * a callback function after subscribed P&S key value changes.

    18 *

    19 */

    20 

    21 #include "propertylistener.h"

    22 #include "logger.h"

    23 

    24 using namespace java::installer;

    25 

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

    27 

    28 CPropertyListener* CPropertyListener::NewL(TUid aUid, TUint aKey)

    29 {

    30     CPropertyListener* self = new(ELeave) CPropertyListener(aUid, aKey);

    31     CleanupStack::PushL(self);

    32     self->ConstructL();

    33     CleanupStack::Pop(self);

    34     return self;

    35 }

    36 

    37 CPropertyListener::CPropertyListener(TUid aUid, TUint aKey)

    38     : CActive(CActive::EPriorityStandard), iUid(aUid), iKey(aKey)

    39 {

    40 }

    41 

    42 void CPropertyListener::ConstructL()

    43 {

    44     User::LeaveIfError(iProperty.Attach(iUid, iKey));

    45     // PropertyListener is always created from a thread which does

    46     // not have ActiveScheduler, so create ActiveScheduler now.

    47     iActiveScheduler = new(ELeave) CActiveScheduler;

    48     CActiveScheduler::Install(iActiveScheduler);

    49     // Add this object to the ActiveScheduler.

    50     CActiveScheduler::Add(this);

    51 }

    52 

    53 CPropertyListener::~CPropertyListener()

    54 {

    55     Cancel();

    56     iProperty.Close();

    57     if (iActiveScheduler)

    58     {

    59         delete iActiveScheduler;

    60         iActiveScheduler = 0;

    61     }

    62 }

    63 

    64 void CPropertyListener::ProcessEventsL(JNIEnv *aEnv, jobject aProvider)

    65 {

    66     // Get the java side callback method.

    67     jclass clazz = aEnv->GetObjectClass(aProvider);

    68     jmethodID method = aEnv->GetMethodID(clazz, "valueChanged", "(I)V");

    69 

    70     iEnv = aEnv;

    71     iProvider = aProvider;

    72     iMethod = method;

    73 

    74     // Run propertyListener once so that the current property value

    75     // gets delivered and property value changes are subscribed.

    76     RunL();

    77 

    78     // Start ActiveScheduler.

    79     CActiveScheduler::Start();

    80 }

    81 

    82 void CPropertyListener::RunL()

    83 {

    84     if (iCancelled)

    85     {

    86         CActiveScheduler::Stop();

    87         return;

    88     }

    89 

    90     // Resubscribe before handling the new value to prevent missing updates.

    91     iProperty.Subscribe(iStatus);

    92     SetActive();

    93 

    94     TInt value;

    95     TInt err = iProperty.Get(value);

    96     if (KErrNone == err)

    97     {

    98         //ILOG3(EJavaInstaller,

    99         //      "CPropertyListener::RunL: property value changed"

   100         //      ", uid: 0x%x, key: 0x%x, value: %d", iUid.iUid, iKey, value);

   101         // Use callback method to deliver the changed property value to

   102         // Java side object.

   103         iEnv->CallVoidMethod(iProvider, iMethod, value);

   104     }

   105     else if (KErrNotFound == err)

   106     {

   107         // Property deleted, no actions needed.

   108     }

   109     else

   110     {

   111         // Error while reading property value.

   112         ELOG3(EJavaInstaller,

   113               "CPropertyListener::RunL: getting property value failed"

   114               ", uid: 0x%x, key: 0x%x, err=%d", iUid.iUid, iKey, err);

   115     }

   116 }

   117 

   118 void CPropertyListener::DoCancel()

   119 {

   120     iCancelled = ETrue;

   121     iProperty.Cancel();

   122 }