author | William Roberts <williamr@symbian.org> |
Tue, 16 Mar 2010 16:12:26 +0000 | |
branch | Symbian2 |
changeset 2 | 2fe1408b6811 |
parent 0 | 061f57f2323e |
child 4 | 837f303aceeb |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2008 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 the License "Symbian Foundation License v1.0" to Symbian Foundation members and "Symbian Foundation End User License Agreement v1.0" to non-members |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.symbianfoundation.org/legal/licencesv10.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: Sensor channel class definition |
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* |
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*/ |
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#ifndef SENSRVCHANNEL_H |
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#define SENSRVCHANNEL_H |
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#include <e32base.h> |
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#include <sensrvtypes.h> |
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#include <sensrvchannelconditionset.h> |
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#include <sensrvchannelinfo.h> |
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class MSensrvPropertyListener; |
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class MSensrvDataListener; |
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class MSensrvChannelConditionListener; |
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class CSensrvChannelCondition; |
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class CSensrvChannelListener; |
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/** |
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* The CSensrvChannel class provides an API that allows clients to open, control, configure, |
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* receive data and receive notifications from a sensor channel. |
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* |
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* When instantiating CSensrvChannel an instance of TSensrvChannelInfo returned by |
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* CSensrvChannelFinder::FindChannelsL() must be used. This ensures that internal data used |
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* in identifying the chosen channel is passed back to Sensor Services in its entirety |
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* therefore ensuring correct operation. Not using the instance returned by |
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* CSensrvChannelFinder::FindChannelsL() will result in undefined behaviour. |
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* |
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* On instantiation of this class a session connection to the Sensor Server is made. The Sensor |
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* server is a transient server and is started, if not already running, when a session connection |
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* is made. The sensor server is shutdown when a device-configured timeout period expires after |
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* the last session connection has been dropped. The Sensor Server will not shutdown if there is |
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* a session connection to it. |
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* |
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* The instance of TSensrvChannelInfo returned by CSensrvChannelFinder::FindChannelsL() |
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* contains a channel Id which is only valid for the lifetime of the sensor server. If a client |
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* requires that this id remains unchanged then the client must ensure that an instance of either |
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* CSensrvChannelFinder or CSensrvChannel remains instantiated. This keeps a session connection with |
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* the server open which prevents the sensor server from shutting down. |
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* |
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* After creating an instance of this class a client would typically: |
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* 1. Check the configuration of the channel using GetPropertyL() or GetAllPropertuies(). |
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* 2. Change the configuration where necessary using SetPropertiesL() |
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* 3. If SetPropertiesL() failed, because of higher priority clients of this same channel or higher |
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* priority clients of impacted channels on the same sensor, listen for notifications indicating |
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* when it is able to set properties using SetPropertyListenerl(). |
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* 4. Listen for property changes using SetPropertyListenerl(). This notifies the client of property |
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* changes made by other clients of this same channel. |
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* 5. Listen for data and retrieve data on the channel using StartDataListeningL() and GetData(). |
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* 6. Set trigger conditions for a 1 off notification when the condition is met using AddConditionL() |
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* and SetConditionListeningL(). |
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* |
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* Its possible that there may be more than 1 client using the same sensor channel on the device. Each |
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* of these clients will have created their own instance of CSensrvChannel and can attempt to configure |
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* the sensor using the SetPropertyL() operation. To manage any contention between clients wishing to |
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* change the configuration of the sensor a concept of Client Priorities is employed. This means that a |
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* device creator assigns a pre-determined priority to a client. If a client has not been assigned a |
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* priority then it is assumed it has the lowest priority. |
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* |
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* When the SetPropertyL() operation is called the sensor server checks to see if the client has the |
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* highest Client Priority of all clients using that channel or using an impacted channel on the same |
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* sensor. If it has the property is set and all other clients of the channel are notified of the property |
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* change. If it has not the SetPropertyL() operation fails with KErrAccessDenied. If clients have |
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* the same priority then property setting is done on a first come first served basis. |
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* |
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* If a client is unable to set a property because of higher priority clients then the client should |
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* implement the MSensrvPropertyListener::SetPropertySuccessIndicationChanged() callback so that they can |
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* be notified when they are able to set properties. |
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* |
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* All client applications should be designed in such a way so that they are able to handle the situation |
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* where they are unable to configure a channel using the SetPropertyL() operation. |
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* |
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* For example: |
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* Should application features be disabled or should the application shutdown in such conditions? |
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* Should features be disabled under certain channel configurations? |
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* |
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* This object is closed when deleted either by a call to operator delete or by the cleanup stack. No special |
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* cleanup code is necessary to close the object before deletion. |
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* |
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* @see CSensrvChannelFinder |
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* @lib sensrvclient.lib |
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* @since S60 5.0 |
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*/ |
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NONSHARABLE_CLASS( CSensrvChannel ): public CBase |
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{ |
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public: |
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/** |
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* Two-phased constructor. |
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* |
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* The Sensor Server uses aChannelInfo to identify the channel in the server that the returned object |
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* represents. |
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* |
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* @since S60 5.0 |
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* @param aChannelInfo The information that determines which channel object is created. This must |
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* be an object returned by CSensrvChannelFinder::FindChannelsL(). |
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* @return Pointer to created CSensorChannel object |
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* @leave KErrNoMemory |
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* @leave One of the system-wide error codes |
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*/ |
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IMPORT_C static CSensrvChannel* NewL |
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( const TSensrvChannelInfo& aChannelInfo ); |
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|
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/** |
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* Two-phased constructor. |
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* |
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* The Sensor Server uses aChannelInfo to identify the channel in the server that the returned object |
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* represents. |
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* |
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* @since S60 5.0 |
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* @param aChannelInfo The information that determines which channel object is created. This must |
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* be an object returned by CSensrvChannelFinder::FindChannelsL(). |
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* @return Pointer to created CSensorChannel object that is placed on the cleanup stack. |
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* @leave KErrNoMemory |
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* @leave One of the system-wide error codes |
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*/ |
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IMPORT_C static CSensrvChannel* NewLC |
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( const TSensrvChannelInfo& aChannelInfo ); |
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|
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public: |
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/** |
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* Initializes and opens the channel. After the channel is opened, the client can set and get channel |
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* properties, add channel conditions and listen for sensor data. |
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* |
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* @since S60 5.0 |
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* @leave KErrAlreadyExists if channel is already open |
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* @leave One of the system-wide error codes |
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*/ |
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virtual void OpenChannelL() = 0; |
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|
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/** |
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* Closes the channel. |
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* |
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* This object is closed when deleted either by a call to operator delete or by the cleanup stack. No special |
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* cleanup code is necessary to close the object before deletion. |
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* |
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* @since S60 5.0 |
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* @return KErrNone if channel closing is successful, or one of the system-wide error codes |
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*/ |
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virtual TInt CloseChannel() = 0; |
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|
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/** |
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* Retrieves a channel information object related to this channel. |
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* |
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* @since S60 5.0 |
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* @return Reference to the channel information object |
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*/ |
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virtual const TSensrvChannelInfo& GetChannelInfo() const = 0; |
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|
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/** |
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* Starts channel data listening on the channel. |
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* |
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* To use this operation clients must provide an object that inherits from MSensrvDataListener. |
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* |
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* When new data is available to be read, the client is notified by the |
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* MSensrvDataListener::DataReceived() callback. On receiving this notificaton the client should |
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* retrieve the data using the GetData() operation. |
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* |
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* Note that if a client is listening for both data and conditions on the channel then the lower |
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* desired count and buffering period provided in either start listening operation arguments will be |
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* used for both listeners. When either listener is stopped neither the desired count nor the |
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* buffering period shall be changed. |
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* |
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* For the best performance, always use the highest desired count and maximum count as the use case |
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* allows. This will reduce the overhead caused by a high volume of IPC context switches. However, |
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* be aware that higher counts need to reserve more memory. |
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* |
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* @since S60 5.0 |
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* @param aDataListener Data listener for the channel. Must be valid until data listening is stopped. |
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* @param aDesiredCount Desired receiving buffer size defined as a count of the channel data objects. |
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* The maximum value is determined by sensor server internal channel buffer size, and minimum |
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* value is one. Any value outside these limits is interpreted as maximum possible value. |
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* The actual count of channel data objects received may be smaller than aDesiredCount, if a |
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* non-zero buffering period has been specified. |
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* The actual count of channel data objects received may larger, if aMaximumCount is bigger |
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* than aDesiredCount. |
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* If the sensor supplies data sporadically, and the clients requires every data object then |
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* aDesiredCount should be set to one to ensure that no data objects are missed. |
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* @param aMaximumCount Maximum receiving buffer size defined as a count of the channel data object. |
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* The Maximum value is determined by sensor server internal channel buffer size, and minimum |
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* value is aDesiredCount. Any value outside these limits is interpreted as maximum possible |
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* value. |
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* It is recommended that whenever aDesiredCount needs to be low and sensor has relatively high |
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* data rate, aMaximumCount is set to significantly higher than aDesiredCount to reduce IPC |
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* context switches and data loss. |
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* @param aBufferingPeriod Specifies the maximum time in milliseconds that sensor server waits before |
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* notifying the client that new data is available. It is possible that no new data is will be |
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* available when the client is notified. |
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* Zero timeout means that only desired and maximum counts are used in getting data. |
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* Using a buffering period results in lot of unnecessary IPC context switches if a sensor |
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* channel supplies data sporadically. It is therefore recommended that a buffering period is |
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* used only when it is absolutely vital to have data at specific intervals and using a low |
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* desired count is otherwise too expensive performance-wise. |
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* @leave KErrArgument if aDataListener is NULL, or if a negative argument is supplied |
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* @leave KErrNotFound if the channel is not open |
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* @leave KErrAlreadyExists if data listening has already started on the channel |
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* @leave One of the system-wide error codes |
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*/ |
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virtual void StartDataListeningL( MSensrvDataListener* aDataListener, |
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const TInt aDesiredCount, |
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const TInt aMaximumCount, |
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const TInt aBufferingPeriod ) = 0; |
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|
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/** |
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* Stop channel data listening. |
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* |
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* @since S60 5.0 |
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* @return KErrNone if stopping successful or one of the system-wide error codes |
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*/ |
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virtual TInt StopDataListening() = 0; |
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/** |
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* Get data items when the client is notified by the MSensrvDataListener::DataReceived() callback |
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* that new data is ready to be retrieved. The callback also indicates the number of data items |
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* contained in aData. |
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* |
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* Example: |
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* |
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* How to retrieve data using TPckg |
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* |
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* @code |
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* void DataReceived(CSensrvChannel& aChannel, TInt aCount, TInt aDataLost ) |
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* { |
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* if(aChannel.GetChannelInfo().iChannelType == KSensrvChannelTypeIdAccelerometerXYZAxisData) |
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* { |
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* TSensrvAccelerometerAxisData XYZData; |
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* TPckg<TSensrvAccelerometerAxisData> XYZPackage( XYZData ); |
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* aChannel.GetData( XYZPackage ); |
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* } |
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* } |
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* @endcode |
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* |
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* @since S60 5.0 |
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* @param aData Reference to descriptor that contains the data. Typically this is a package buffer |
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* defined for data type of this channel. See channel specific data headers for details of |
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* the package types and data supported by a channel. |
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* @return KErrNotFound if data buffer is empty, KErrOverflow if aData is wrong size for data |
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* item, or one of the system-wide error codes |
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*/ |
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virtual TInt GetData( TDes8& aData ) = 0; |
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/** |
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* Sets a property value for this channel. To manage any contention between multiple clients wishing |
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* to change the configuration of the sensor a concept of Client Priorities is employed. See class |
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* description for further information. |
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* |
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* The sensor plugin may police setting of properties by verifying that the client making the request |
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* has the necessary capabilities. If the client does not then it will return with KErrAccessDenied. |
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* @since S60 5.0 |
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* @param aProperty Identifies the property that is to be set and its new value. Only the Property Id, |
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* Item Index and Property Value should be filled in. All other fields in TSensrvProperty are |
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* ignored. |
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* @return KErrNotFound if channel is not open or if the property does not exist, KErrAccessDenied |
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* if there are other clients for this channel or impacted channel on the same sensor with a |
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* higher Client Priority, KErrAccessDenied if the client does not have the required |
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* capabilities or one of the system-wide error codes |
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*/ |
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virtual TInt SetProperty( const TSensrvProperty& aProperty ) = 0; |
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|
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/** |
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* Gets a channel property value for this channel. |
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* |
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* @since S60 5.0 |
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* @param aPropertyId Id of the property that is to be retrieved |
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* @param aItemIndex The Item Index of the property to be retrieved. This is mapped to a specific item |
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* in channel data structure. See channel specific data headers. |
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* @param aProperty Reference for a property object where property data is to be copied |
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* @leave KErrNotFound if channel is not open |
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* @leave KErrNotFound if property does not exist |
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* @leave KErrArgument if a negative argument is supplied |
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* @leave One of the system-wide error codes |
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* */ |
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virtual void GetPropertyL( const TSensrvPropertyId aPropertyId, |
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const TInt aItemIndex, |
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TSensrvProperty& aProperty ) = 0; |
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|
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/** |
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* Get a channel property value for this channel |
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* |
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* @since S60 5.0 |
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* @param aPropertyId Id of the property that is to be retrieved |
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* @param aItemIndex Item Index of the property to be retrieved. This is mapped to a specific item |
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* in channel data structure. See channel specific data headers. |
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* @param aArrayIndex Array index of the property to be retrieved when the property is part of a |
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* property array. |
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* @param aProperty Reference for a property object where property data is to be copied |
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* @leave KErrNotFound if channel is not open |
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* @leave KErrNotFound if property does not exist |
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* @leave KErrArgument if a negative argument is supplied |
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* @leave One of the system-wide error codes |
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*/ |
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virtual void GetPropertyL( const TSensrvPropertyId aPropertyId, |
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const TInt aItemIndex, |
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const TInt aArrayIndex, |
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TSensrvProperty& aProperty ) = 0; |
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/** |
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* Get all properties for this channel |
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* |
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* @since S60 5.0 |
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* @param aChannelPropertyList Reference for a property list where all property data is to be |
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* copied. Any existing data in the list will be lost. |
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* @leave KErrNotFound if channel is not open |
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* @leave One of the system-wide error codes |
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*/ |
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virtual void GetAllPropertiesL |
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( RSensrvPropertyList& aChannelPropertyList ) = 0; |
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|
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/** |
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* Get all channel properties having the supplied Property Id. This is used when the property |
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* is an array property. |
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* |
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* @since S60 5.0 |
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* @param aPropertyId Id of the property to be retrieved |
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* @param aChannelPropertyList Reference for a property list where all property data is to be |
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* copied. Any existing data in the list will be lost. |
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* @leave KErrNotFound if channel is not open |
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* @leave KErrNotFound if property does not exist |
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* @leave One of the system-wide error codes |
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336 |
*/ |
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337 |
virtual void GetAllPropertiesL |
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338 |
( const TSensrvPropertyId aPropertyId, |
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RSensrvPropertyList& aChannelPropertyList ) = 0; |
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340 |
|
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341 |
/** |
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342 |
* Start property listening on this channel. |
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343 |
* |
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344 |
* To use this operation clients must provide an object that inherits from MSensrvPropertyListener. |
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345 |
* |
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346 |
* The client can use the property listener to get notifications when properties are changed and |
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347 |
* to get a notification when the client is able/unable to set properties because of higher priority |
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348 |
* clients have opened/closed the same sensor channel. |
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349 |
* |
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350 |
* If the client itself changes a property value, no notification is received for that property by |
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351 |
* the client. If another client changes a property on this channel or another channel that impacts |
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352 |
* this channel a notification will be received by the client. |
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353 |
* |
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354 |
* Some sensors support a number of channels with each channel having some common properties. |
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355 |
* Therefore changing a common property may result in notifications on a number of other channels |
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356 |
* supported by the sensor. |
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357 |
* |
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358 |
* @since S60 5.0 |
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359 |
* @param aChannelPropertyListener Pointer to channel property listener callback instance. The |
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360 |
* channel property listener must be valid until the CSensrvChannel object is destroyed or |
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361 |
* listening has been stopped. Listening can be stopped using a NULL parameter. |
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362 |
* @leave KErrAlreadyExists if channel property listener has already been set |
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363 |
* @leave KErrNotFound if channel is not open |
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364 |
* @leave One of the system-wide error codes |
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365 |
*/ |
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366 |
virtual void SetPropertyListenerL |
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367 |
( MSensrvPropertyListener* aChannelPropertyListener ) = 0; |
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368 |
|
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369 |
/** |
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370 |
* Add a channel ConditionSet to the channel. |
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371 |
* |
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372 |
* Channel ConditionSet's are used for channel condition listening and at least 1 ConditionSet must |
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373 |
* be added before listening can begin. |
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374 |
* |
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375 |
* When the conditions defined by the ConditionSet is met the client will be notified by the |
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376 |
* MSensrvChannelConditionListener::ConditionMet() callback and listening for this ConditionSet will |
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377 |
* cease. If a client wishes to listen for this ConditionSet again it must be added again. |
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378 |
* |
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379 |
* The client continues to own the ConditionSet object after a call to this function and must ensure |
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380 |
* that it is destroyed when no longer required. |
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381 |
* |
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382 |
* The client must ensure that the ConditionSet object is valid until it is no longer needed by the |
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383 |
* Sensor Server. This is either after the condition set has been removed by the client using |
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384 |
* RemoveConditionL() or the client has been notified that the condition has been met. |
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385 |
* |
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386 |
* @since S60 5.0 |
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387 |
* @param aChannelConditionSet The channel condition set to be added. |
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388 |
* @leave KErrNotFound if channel is not open |
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389 |
* @leave KErrNotSupported if a channel does not support conditions. |
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390 |
* @leave One of the system-wide error codes |
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391 |
* @see CSensrvChannel::StartConditionListeningL() |
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392 |
*/ |
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393 |
virtual void AddConditionL( CSensrvChannelConditionSet& aChannelConditionSet ) = 0; |
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394 |
|
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395 |
/** |
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396 |
* Remove a channel ConditionSet from the channel. |
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397 |
* |
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398 |
* The same reference used to to add the Condition Set in AddConditionL(), must also be used to |
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399 |
* remove it. |
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400 |
* |
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401 |
* The removed channel ConditionSet is no longer used for channel condition listening. |
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402 |
* |
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403 |
* The client continues to own the ConditionSet object after a call to this function and must ensure |
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404 |
* that it is destroyed when no longer required. |
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405 |
* |
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406 |
* @since S60 5.0 |
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407 |
* @param aChannelConditionSet The channel condition set to be removed. |
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408 |
* @leave KErrNotFound if channel is not open |
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409 |
* @leave One of the system-wide error codes |
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410 |
*/ |
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411 |
virtual void RemoveConditionL |
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412 |
( CSensrvChannelConditionSet& aChannelConditionSet ) = 0; |
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413 |
|
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414 |
/** |
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415 |
* Start channel condition listening. |
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416 |
* |
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417 |
* To use this operation clients must provide an object that inherits from MSensrvChannelConditionListener. |
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418 |
* |
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419 |
* If the conditions of an added ConditionSet is met the MSensrvChannelConditionListener::ConditionMet() |
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420 |
* callback function will be called and listening for this ConditionSet will cease. If a client wishes |
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421 |
* to listen for the same ConditionSet again it must be added again. |
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422 |
* |
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423 |
* Note that if a client is listening for both data and conditions on the channel then the lower |
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424 |
* desired count and buffering period provided in either start listening operation arguments will be |
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425 |
* used for both listeners. When either listener is stopped neither the desired count nor the |
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426 |
* buffering period shall be changed. |
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427 |
* |
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428 |
* @since S60 5.0 |
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429 |
* @param aChannelConditionListener Condition listener for the channel. Must be valid until data |
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430 |
* listening is stopped. |
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431 |
* @param aObjectCount Listening buffer size defined as a count of the channel data objects. When the |
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432 |
* desired object count is reached each ConditionSet is evaluated in turn. The maximum value is |
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433 |
* determined by sensor server internal channel buffer size, and minimum value is one. Any value |
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434 |
* outside these limits is interpreted as maximum possible value. |
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435 |
* @param aBufferingPeriod Specifies the maximum time in milliseconds that sensor server waits before |
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436 |
* evaluating new data. |
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437 |
* Zero timeout means that the sensor server only evaluates new data when the object count has been |
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438 |
* reached. |
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439 |
* @leave KErrArgument if aChannelConditionListener is NULL, or if a negative argument is supplied |
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440 |
* @leave KErrNotFound if the channel is not open |
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441 |
* @leave KErrAlreadyExists if condition listening has already started on the channel |
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442 |
* @leave One of the system-wide error codes |
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443 |
*/ |
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444 |
virtual void StartConditionListeningL |
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445 |
( MSensrvChannelConditionListener* aChannelConditionListener, |
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const TInt aObjectCount, |
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const TInt aBufferingPeriod ) = 0; |
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|
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/** |
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* Stop channel condition listening. |
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* |
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* All remaining unmet ConditionSet's are removed and channel condition listening is stopped. |
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453 |
* |
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* If the same ConditionSet's need to be used when condition listening has been restarted then they must be |
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* re-added. |
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456 |
* |
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* @since S60 5.0 |
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* @return KErrNone if condition listening is successfully stopped or one of the system-wide error codes |
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*/ |
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virtual TInt StopConditionListening() = 0; |
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461 |
|
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462 |
public: |
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463 |
/** |
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* Default constructor. |
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*/ |
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CSensrvChannel(); |
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}; |
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469 |
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#endif //SENSRVCHANNEL_H |
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471 |
|
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// End of File |