phoneapp/phoneuiutils/inc/cphonepubsubproxy.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Fri, 19 Feb 2010 22:50:26 +0200
branchRCL_3
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/*
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* Copyright (c) 2005 Nokia Corporation and/or its subsidiary(-ies). 
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:  Used as proxy for phone application to get and observe 
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*                the change of the variable.state of the phone.
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*
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*/
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#ifndef __CPHONEPUBSUBPROXY_H
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#define __CPHONEPUBSUBPROXY_H
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//  INCLUDES
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#include <coemain.h>
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#include <e32property.h>
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#include "mphonepubsubobserver.h"
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// FORWARD DECLARATIONS
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class CPhonePublishSubscriberAO;
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class CIdle;
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/**
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*  CPhonePubSubProxy is an API used as proxy for phone application to get/set
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*  and observe variable states.
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*
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*  How to get some setting?
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*  ---------------------------
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*  example code:
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*
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*  TUid category = KUidSystemCategory
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*  TUInt key = KPSUidAutolockStatusValue
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*  Tint value = CPhonePubSubProxy::Instance()->GetValue( category, key ); 
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*  
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*  uid and states can be found in PSVariables.h
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*  
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*  How to set any settings
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*  --------------------------------------
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*  example code:
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*
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*  TUid category = KUidSystemCategory
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*  TUInt key = KPSUidAutolockStatusValue
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*  TInt value = EPSAutolockOn;
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*
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*  CPhonePubSubProxy::Instance()->ChangePropertyValue( category, key, value );
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*
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*  How to observe any settings
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*  --------------------------------------
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*  example code:
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* 
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*  class CPhoneSomeManager : private MPhonePubSubObserver
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*  {
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*  
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*  virtual void HandlePropertyChangedL( const TUid& aCategory, 
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*            const TUint aKey, const TInt aValue );
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*  }
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*
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*  CPhoneSomeManager::SomeFunctionL
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*      {
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*      CPhonePubSubProxy::Instance()->NotifyChangeL( cat1, key1, this );
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*      CPhonePubSubProxy::Instance()->NotifyChangeL( cat2, key2, this );
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*      }
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*  
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*  CPhoneSomeManager::HandlePropertyChangedL( 
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*      const TUid& aCategory, 
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*      const TUint aKey, 
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*      const TInt aValue )
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*      {
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*      switch( aCategory )
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*          {
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*          case KUidSomeCategory1:
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*               .... //do something for the category i.e. look at value
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*          case KUidSomeCategory2:
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*               .... //do something for the category i.e. look at value
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*          default:
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*               .... //panic in debug
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*          }
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*      }
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*
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*  The CancelAllNotifies() should be always called before destroy the object
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*  CPhoneSomeManager::~CPhoneSomeManager()
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*      {
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*      CPhonePubSubProxy::Instance()->CancelAllNotifies( this );
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*      }
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*/
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// CLASS DECLARATION
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/**
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*  Used as proxy for phone application to get and observe the change of the
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*  state of the phone.
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*/
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class CPhonePubSubProxy : public CCoeStatic, public MPhonePubSubObserver
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    {
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    public:  // Constructors and destructor
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        /**
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        * First call initializes the singleton object. Subsequent calls 
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        * return instance.
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        * @return the created instance.
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        */
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        IMPORT_C static CPhonePubSubProxy* Instance();
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        /**
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        * Destructor.
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        */
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        IMPORT_C virtual ~CPhonePubSubProxy();
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    public: // New Functions 
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        /**
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        * Cancel all requests by the observer. This function should always be 
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        * call before an object is destroyed. During shutdown, this singleton
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        * may be deleted before the classes that observe it. If this happens, the
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        * routine will just return since of requests have already been cancelled.
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        * @param aObserver
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        */
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        IMPORT_C static void CancelAllNotifications( 
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            MPhonePubSubObserver* aObserver );
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        /**
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        * Get the property value of particular category key.
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        *
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        * @param aCategory the category for the key.
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        * @param aKey the property key.
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        * @return current property value.
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        */
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        IMPORT_C TInt Value( const TUid& aCategory, const TUint aKey );
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        /**
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        * Notify the change of state to particular varible.
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        *
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        * @param aUid Specify the uid of the particular varible.
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        * @param aObserver The observer to receive the notification.
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        */
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        IMPORT_C void NotifyChangeL( 
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            const TUid& aCategory, 
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            const TUint aKey,
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            MPhonePubSubObserver* aObserver );
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        /**
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        * Change a specific property value.
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        *
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        * @param aCategory Category of property.
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        * @param aKey Property key to be changed
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        * @param aValue New property value.
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        */
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        IMPORT_C void ChangePropertyValue( 
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            const TUid& aCategory,
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            const TUint aKey,
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            const TInt aValue );
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    private:
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        /**
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        * Two-phased constructor.
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        * @return new instance.
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        */
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        static CPhonePubSubProxy* NewL();
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        /**
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        * C++ constructor.
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        */
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        CPhonePubSubProxy();
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        /**
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        * Symbian OS constructor.
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        */
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        void ConstructL();
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    private:
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        /**
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        * Cancel all request by the observer. 
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        * @param aObserver
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        */
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        void CancelAllObserverNotifies( 
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            MPhonePubSubObserver* aObserver );
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        /**
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        * function used to forward change events to observers.
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        * @param aCategory Category of property
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        * @param aKey Property key that is changed
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        * @param aValue New property value
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        */
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        void HandlePropertyChangedL( 
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            const TUid& aCategory, 
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            const TUint aKey, 
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            const TInt aValue );
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    private:    // Data
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        // Observer elements.
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        class TPubSubObserverTag
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            {
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           public: 
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                // Unique property category.
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                TUid iCategory; 
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                // Property key
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                TUint iKey;
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                // Observer.
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                MPhonePubSubObserver* iObserver;
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            };
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        // Owned array of observers.
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        CArrayFixFlat<TPubSubObserverTag>* iObserverArray;
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        // Owned array of publish subscribers.
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        CArrayPtrFlat<CPhonePublishSubscriberAO>* iPublishSubscriberArray;
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    };
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#endif      // __CPHONEPUBSUBPROXY_H
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// End of File