author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 02 Feb 2010 01:11:09 +0200 | |
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permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2002-2007 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: Provides way to notify events and register observers |
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* for events |
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* |
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*/ |
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// INCLUDE FILES |
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#include "TSatEventMediator.h" |
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#include "TSatEventsObserver.h" |
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//lint -e766 Used inside TRAP macro, lint misfunction. |
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#include "EnginePanic.h" |
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#include "MSatEventObserver.h" |
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#include "SatLog.h" |
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// FORWARD DECLARE |
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class MSatEventObserver; |
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// ============================ MEMBER FUNCTIONS =============================== |
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// ----------------------------------------------------------------------------- |
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// TSatEventMediator::TSatEventMediator |
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// C++ default constructor can NOT contain any code, that |
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// might leave. |
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// ----------------------------------------------------------------------------- |
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// |
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TSatEventMediator::TSatEventMediator() : |
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iEventsObservers(), |
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iIsNotifying( EFalse ), |
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iDeletionsMarked( EFalse ) |
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{ |
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LOG( SIMPLE, |
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"SATENGINE: TSatEventMediator::TSatEventMediator calling - exiting" ) |
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} |
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// ----------------------------------------------------------------------------- |
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// TSatEventMediator::Reset |
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// Replaces destructor since T classes cannot have one |
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// ----------------------------------------------------------------------------- |
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// |
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void TSatEventMediator::Reset() |
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{ |
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LOG( SIMPLE, "SATENGINE: TSatEventMediator::Reset calling" ) |
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iEventsObservers.ResetAndDestroy(); |
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LOG( SIMPLE, "SATENGINE: TSatEventMediator::Reset exiting" ) |
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} |
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// ----------------------------------------------------------------------------- |
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// TSatEventMediator::Notify |
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// All observers, who are registered to get the notification of aEvent, are |
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// notified |
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// (other items were commented in a header). |
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// ----------------------------------------------------------------------------- |
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// |
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void TSatEventMediator::Notify( |
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TInt aEvent ) // Event |
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{ |
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LOG( DETAILED, "SATENGINE: TSatEventMediator::Notify calling" ) |
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// Go through the list of observers and call notify for observers who are |
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// observing aEvent. |
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// Set the flag on. No one can remove observers when this flag is on |
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iIsNotifying = ETrue; |
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TInt count( iEventsObservers.Count() ); |
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LOG2( DETAILED, "SATENGINE: TSatEventMediator::Notify observers \ |
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count: %d", count ) |
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for ( TInt i = 0; i < count; i++ ) |
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{ |
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TSatEventsObserver* eventsObserver = |
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iEventsObservers[i]; |
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__ASSERT_ALWAYS( eventsObserver, |
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PanicSatEngine( ESatEngineNullPointer ) ); |
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if ( eventsObserver->ObservingEvent( aEvent ) ) |
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{ |
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MSatEventObserver* observer = |
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eventsObserver->Observer(); |
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if ( observer ) |
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{ |
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LOG( DETAILED, "TSatEventMediator::Notify observer found" ) |
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// Observer found, notify it |
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observer->Event( aEvent ); |
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// Check is iEventObservers list changed. Some observers might |
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// remove themselves and notify a new event (new Notify loop) |
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// and marked observers are deleted there. When it comes back |
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// here iEventsObserver has changed |
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if ( count > iEventsObservers.Count() ) |
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107 |
{ |
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LOG( DETAILED, "TSatEventMediator::Notify \ |
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count > iEventsObservers.Count()" ) |
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TInt newCount( iEventsObservers.Count() ); |
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i = i - ( count - newCount ); |
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count = newCount; |
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} |
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} |
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115 |
else |
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116 |
{ |
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LOG( DETAILED, "TSatEventMediator::Notify observer not found" ) |
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// Found NULL observer -> Mark fo deleted. This is deleted after |
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// this notification loop |
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eventsObserver->RemoveEvent( aEvent ); |
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eventsObserver->MarkForDelete(); |
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} |
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} |
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} |
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125 |
|
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// Set the flag off. Now observers can be removed |
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iIsNotifying = EFalse; |
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128 |
|
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// Check was there any deletions during notify loop |
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if ( iDeletionsMarked ) |
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131 |
{ |
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LOG( DETAILED, "TSatEventMediator::Notify iDeletionsMarked true" ) |
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// Delete marked observers |
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DeleteMarkedObservers(); |
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iDeletionsMarked = EFalse; |
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} |
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137 |
|
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138 |
LOG( DETAILED, "SATENGINE: TSatEventMediator::Notify exiting" ) |
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139 |
} |
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140 |
|
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141 |
// ----------------------------------------------------------------------------- |
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142 |
// TSatEventMediator::RegisterL |
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// Registers observer for getting the event when event is notified using |
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// Notify( TInt aEvent ). |
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// (other items were commented in a header). |
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146 |
// ----------------------------------------------------------------------------- |
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// |
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148 |
void TSatEventMediator::RegisterL( |
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MSatEventObserver* aObserver, // Observer of aEvent. |
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TInt aEvent ) // Event, which will be trigger of notification. |
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151 |
{ |
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LOG( SIMPLE, "SATENGINE: TSatEventMediator::RegisterL calling" ) |
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153 |
|
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__ASSERT_ALWAYS( aObserver, PanicSatEngine( ESatEngineNullPointer ) ); |
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// Check if aObserver instance is already registered, so that we dont |
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// create a new TSatEventsObserver entry in to the iEventsObserver list. |
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TSatEventsObserver* eventsObserver = HasObserverInstance( aObserver ); |
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158 |
|
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if ( NULL != eventsObserver ) |
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160 |
{ |
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LOG( SIMPLE, "SATENGINE: TSatEventMediator::RegisterL eventsObserver \ |
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not NULL" ) |
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// Add the event for the observer. |
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eventsObserver->AddEventL( aEvent ); |
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165 |
} |
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166 |
else |
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167 |
{ |
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168 |
LOG( SIMPLE, "SATENGINE: TSatEventMediator::RegisterL eventsObserver \ |
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169 |
NULL" ) |
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// Observer is registering for the first time. |
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171 |
eventsObserver = new( ELeave )TSatEventsObserver( aObserver ); |
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172 |
CleanupStack::PushL( eventsObserver ); |
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eventsObserver->AddEventL( aEvent ); |
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174 |
User::LeaveIfError( iEventsObservers.Append( eventsObserver ) ); |
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CleanupStack::Pop( eventsObserver ); |
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176 |
} |
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177 |
|
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178 |
LOG( SIMPLE, "SATENGINE: TSatEventMediator::RegisterL exiting" ) |
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179 |
} |
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180 |
|
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181 |
// ----------------------------------------------------------------------------- |
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// TSatEventMediator::Unregister |
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// Removes aEvent from aObservers observable events. |
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// (other items were commented in a header). |
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185 |
// ----------------------------------------------------------------------------- |
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186 |
// |
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187 |
void TSatEventMediator::Unregister( |
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const MSatEventObserver* aObserver, // Observer of aEvent. |
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TInt aEvent ) // Event, which the observer is observing. |
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190 |
{ |
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191 |
LOG( SIMPLE, "SATENGINE: TSatEventMediator::Unregister calling" ) |
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192 |
|
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// Check if observer is registered. |
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TSatEventsObserver* eventsObserver = HasObserverInstance( aObserver ); |
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if ( NULL != eventsObserver ) |
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196 |
{ |
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197 |
LOG( SIMPLE, "SATENGINE: TSatEventMediator::RegisterL eventsObserver \ |
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not NULL" ) |
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eventsObserver->RemoveEvent( aEvent ); |
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200 |
|
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201 |
// Remove the eventsObserver from the list if the observer has |
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202 |
// no longer any events to observe. |
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203 |
if ( 0 == eventsObserver->EventCount() ) |
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204 |
{ |
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// Prevent delete if we are notifying observers |
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if ( !iIsNotifying ) |
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207 |
{ |
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LOG( SIMPLE, "SATENGINE: TSatEventMediator::Unregister \ |
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iIsNotifying false" ) |
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const TInt index = iEventsObservers.Find( eventsObserver ); |
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// Does not destroy the object. |
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iEventsObservers.Remove( index ); |
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iEventsObservers.GranularCompress(); |
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delete eventsObserver; |
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} |
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else |
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{ |
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LOG( SIMPLE, "SATENGINE: TSatEventMediator::Unregister \ |
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iIsNotifying true" ) |
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// If we are notifying, mark this observer as deleted |
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eventsObserver->MarkForDelete(); |
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iDeletionsMarked = ETrue; |
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} |
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} |
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} |
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|
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LOG( SIMPLE, "SATENGINE: TSatEventMediator::Unregister exiting" ) |
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} |
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|
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// ----------------------------------------------------------------------------- |
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// TSatEventMediator::Unregister |
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// (other items were commented in a header). |
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// ----------------------------------------------------------------------------- |
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// |
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void TSatEventMediator::Unregister( |
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const MSatEventObserver* aObserver ) // Observer of aEvent. |
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{ |
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LOG( SIMPLE, "SATENGINE: TSatEventMediator::Unregister calling" ) |
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|
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// Check if observer is registered. |
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TSatEventsObserver* eventsObserver = HasObserverInstance( aObserver ); |
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if ( NULL != eventsObserver ) |
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{ |
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// Prevent delete if we are notifying observers |
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if ( !iIsNotifying ) |
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{ |
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LOG( SIMPLE, "SATENGINE: TSatEventMediator::Unregister \ |
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iIsNotifying false" ) |
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const TInt index = iEventsObservers.Find( eventsObserver ); |
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iEventsObservers.Remove( index ); // Does not destroy the object. |
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iEventsObservers.GranularCompress(); |
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delete eventsObserver; |
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} |
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else |
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{ |
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LOG( SIMPLE, "SATENGINE: TSatEventMediator::Unregister \ |
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iIsNotifying true" ) |
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// If we are notifying, mark this observer as deleted |
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eventsObserver->MarkForDelete(); |
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iDeletionsMarked = ETrue; |
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} |
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} |
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|
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LOG( SIMPLE, "SATENGINE: TSatEventMediator::Unregister exiting" ) |
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} |
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|
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// ----------------------------------------------------------------------------- |
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// TSatEventMediator::HasObserverInstance |
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// Checks if aObserver is already registered to this mediator and returns the |
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// result. |
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// (other items were commented in a header). |
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// ----------------------------------------------------------------------------- |
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// |
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TSatEventsObserver* TSatEventMediator::HasObserverInstance( |
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const MSatEventObserver* aObserver ) const // Observer looked from the list. |
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{ |
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LOG( SIMPLE, "SATENGINE: TSatEventMediator::HasObserverInstance calling" ) |
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|
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// Go through the list until same observer instance is found or |
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// all entries have been checked. |
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TSatEventsObserver* foundEventsObserver = NULL; |
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const TInt count( iEventsObservers.Count() ); |
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LOG2( NORMAL, "SATENGINE: TSatEventMediator::HasObserverInstance \ |
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observer count: %d", count ) |
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for ( TInt i = 0; ( i < count ) && ( !foundEventsObserver ); i++ ) |
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{ |
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TSatEventsObserver* eventsObserver = iEventsObservers[i]; |
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__ASSERT_ALWAYS( eventsObserver, |
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PanicSatEngine( ESatEngineNullPointer ) ); |
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|
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if ( aObserver == eventsObserver->Observer() ) |
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{ |
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LOG( SIMPLE, "SATENGINE: TSatEventMediator::HasObserverInstance \ |
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aObserver == eventsObserver->Observer()" ) |
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foundEventsObserver = eventsObserver; |
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} |
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} |
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|
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LOG( SIMPLE, "SATENGINE: TSatEventMediator::HasObserverInstance exiting" ) |
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return foundEventsObserver; |
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} |
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|
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// ----------------------------------------------------------------------------- |
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// TSatEventMediator::DeleteMarkedObservers |
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// Deletes all observers marked as deleted during Notify loop |
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// (other items were commented in a header). |
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// ----------------------------------------------------------------------------- |
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// |
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void TSatEventMediator::DeleteMarkedObservers() |
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310 |
{ |
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LOG( SIMPLE, "SATENGINE: TSatEventMediator::DeleteMarkedObservers calling" ) |
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|
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// Go through the list and delete all observers wich are |
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// marked as deleted |
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TInt count( iEventsObservers.Count() ); |
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LOG2( NORMAL, "SATENGINE: TSatEventMediator::DeleteMarkedObservers \ |
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observer count: %d", count ) |
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for ( TInt i = 0; i < count; i++ ) |
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{ |
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TSatEventsObserver* eventsObserver = |
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iEventsObservers[i]; |
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if ( eventsObserver ) |
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{ |
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LOG( SIMPLE, "SATENGINE: TSatEventMediator::DeleteMarkedObservers\ |
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eventsObserver true" ) |
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// Check is obserer marked and it has no events |
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if ( eventsObserver->IsMarkedForDelete() && |
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( 0 == eventsObserver->EventCount() ) ) |
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{ |
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LOG( SIMPLE, "SATENGINE: TSatEventMediator::\ |
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DeleteMarkedObservers delete Observer" ) |
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iEventsObservers.Remove( i ); // Does not destroy the object. |
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iEventsObservers.GranularCompress(); |
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delete eventsObserver; |
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|
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// Update count value. We just removed an object from list |
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count = iEventsObservers.Count(); |
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i--; |
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} |
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} |
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} |
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|
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LOG( SIMPLE, "SATENGINE: TSatEventMediator::DeleteMarkedObservers exiting" ) |
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} |
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|
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// End of File |