// Copyright (c) 1997-2009 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of "Eclipse Public License v1.0"

// which accompanies this distribution, and is available

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

//

// Initial Contributors:

// Nokia Corporation - initial contribution.

//

// Contributors:

//

// Description:

// The Definition of the CEComServer singleton class which

// instantiates an instance of the requested ECom Interface Implementation.

// 

//

/**

 @internalComponent

 @file

*/

#ifndef __ECOMSERVER_H__

#define __ECOMSERVER_H__

#include <f32file.h>

#include "clientrequest.h"

#include <ecom/ecom.h>

#include <ecom/ecomerrorcodes.h>

#include <ecom/ecomresolverparams.h>

#include <ecom/implementationinformation.h>

#include <ecom/implementationproxy.h>

#include "RegistrarObserver.h"

#include "EComPerformance.h"

#include <babitflags.h>

#include "callback.h"

// Forward declarations

class CRegistryData;

class CRegistrar;

class CResolver;

class CDefaultResolver;

class CRomOnlyResolver;

class TEComResolverParams;

class CServerStartupMgr;

class CRegistryResolveTransaction;

class CCustomResolverCache;

//#define _TRANSIENT_SERVER

#ifdef _TRANSIENT_SERVER

/**

Specifies that the server should shut down after a specified time

If not defined then the server never shuts down

@internalComponent

*/

const TInt KEComShutdownDelay = 0x500000;	// approx 0.5 seconds

#endif

/**

	@internalComponent

	@since 7.0

	A shutdown control object that activates the 

	destruction of the ECom server when its RunL

	fires, by stopping the local scheduler.

 */

class CShutdown : public CTimer

	{

public:

/**

	@internalComponent

	Intended Usage	: Default c'tor	

	Error Condition	: None	

	@since			7.0

	@pre 			None

	@post			CShutdown is fully constructed.

 */

	inline CShutdown();

/**

	Intended Usage	: Standardised 2nd, (Initialisation) phase of two 

					phase construction.

	Error Condition	: None	

	@leave			KErrNoMemory

	@since			7.0

	@pre 			CShutdown is fully constructed.

	@post			CShutdown is fully initialised.

 */

	inline void ConstructL();

/**

	Intended Usage	: Activate the shutdown timeout.

	Error Condition	: None	

	@since			7.0

	@pre 			CShutdown is fully constructed.

	@post			CShutdown is active pending timeout.

 */

	inline void Start();

private:

/**

	Intended Usage	: The timeout has expired, so begin server destruction.

	Error Condition	: None	

	@since			7.0

	@pre 			CShutdown is fully constructed.

	@post			the local CActiveScheduler::Stop() has been called.

 */

	void RunL();

	};

/**

	@internalComponent

	@since 7.0

	A concrete implementation which supplies instantiation & 

	destruction of a class via the ECom framework.

 */

class CEComServer : private CServer2, private MRegistrarObserver

	{

	public:

/**

	Intended Usage	: Standardised safe construction which 

					leaves the returned object on the cleanup stack.

	Error Condition	: Cannot fully construct because of 

					memory limitations.	

	@leave  		KErrNoMemory

	@leave  		@see RFs, CRegistryData, CRegistrar, CDefaultResolver

	@leave  		@see CShutdownTimer & CServer::StartL

	@since			7.0

	@return			CEComServer* a pointer to the new class

	@pre 			None

	@post			CEComServer is fully constructed, initialised,

					and remains upon the cleanup stack.

*/

	static CEComServer* NewLC();

/**

	Intended Usage	: d'tor

	Error Condition	: None	

	@since			7.0

	@pre 			CEComServer must have been fully constructed.

	@post			CEComServer is destroyed.

 */

	~CEComServer();

/**

	Intended Usage	: Reads the EComSrvr.ini file to determine if

					  ECOM should be SSA or not.

	@param			aFs A reference to a connected file server session.

	@pre 			CEComServer must have been fully constructed.

	*/

	TBool IsSSA(RFs& aFs);

/**

	Intended Usage	: Retrieve a list of all the implementations which 

					satisfy the specified interface.

	Error Condition	: Lack of memory.	

	@leave  		KErrNoMemory

	@since			7.0

	@param			aInterfaceUid A UID specifying the required interface.

	@param			aAdditionalParameters A descriptor specifying any additional

					implementation characteristics to be fulfilled.

	@param			aExtendedInterfaces Identifies a set of zero or more extended interfaces to match. 

					Must match all extended interfaces for a match to occur.

	@param			aMessage Client's request					

	@return			RImplInfoArray* A pointer to the array of CImplementationInformation pointers. 

		            Ownership of the created array is returned to the caller,

					who must take the responsibility of destroying it. However, the caller must

					not destroy the list's contents as it is not owned by the list.

	@pre 			CEComServer must have been fully constructed.

	@post			CEComServer has not changed, and RImplInfoArray* contains the list

					of CImplementationInformations regigistered for the interface.		

 */

	RImplInfoArray* ListImplementationsL(TUid aInterfaceUid, 

										 const TEComResolverParams& aAdditionalParameters,

										 const RExtendedInterfacesArray& aExtendedInterfaces,

										 const TClientRequest& aMessage);

/**

	Intended Usage	: Retrieve a list of all the implementations which 

					satisfy the specified interface.

	Error Condition	: Lack of memory.	

	@leave  		KErrNoMemory

	@since			7.0

	@param			aInterfaceUid A UID specifying the required interface.

	@param			aExtendedInterfaces Identifies a set of zero or more extended interfaces to match. 

					Must match all extended interfaces for a match to occur.

	@param			aMessage Client's request					

	@return			RImplInfoArray* A pointer to the array of CImplementationInformation pointers. 

	                Ownership of the created array is returned to the caller,

					who must take the responsibility of destroying it. However, the caller must

					not destroy the list's contents as it is not owned by the list.

	@pre 			CEComServer must have been fully constructed.

	@post			CEComServer has not changed, and RImplInfoArray* contains the list

					of CImplementationInformations regigistered for the interface.			

 */

	RImplInfoArray* ListImplementationsL(TUid aInterfaceUid, 

										 const RExtendedInterfacesArray& aExtendedInterfaces, 

										 const TClientRequest& aMessage);

/**

	Intended Usage	: Retrieve a list of all the implementations which 

					satisfy the specified interface.

	Error Condition	: Lack of memory.	

	@leave  		KErrNoMemory

	@since			7.0

	@param			aInterfaceUid A UID specifying the required interface.

	@param			aAdditionalParameters A descriptor specifying any additional

					implementation characteristics to be fulfilled.

	@param			aResolverUid The CResolver implementation to use.

	@param			aExtendedInterfaces Identifies a set of zero or more extended interfaces to match. 

					Must match all extended interfaces for a match to occur.

	@param			aMessage Client's request										

	@return			RImplInfoArray* A pointer to the array of CImplementationInformation pointers.

					Ownership of the created array is returned to the caller,

					who must take the responsibility of destroying it. However, the caller must

					not destroy the list's contents as it is not owned by the list.

	@pre 			CEComServer must have been fully constructed.

	@post			CEComServer has not changed, and RImplInfoArray* contains the list

					of CImplementationInformations regigistered for the interface.

 */

	RImplInfoArray* ListImplementationsL(TUid aInterfaceUid, 

										 const TEComResolverParams& aAdditionalParameters, 

										 TUid aResolverUid,

										 const RExtendedInterfacesArray& aExtendedInterfaces,

										 const TClientRequest& aMessage);

/**

	Intended Usage	: Retrieve a list of all the implementations which 

					satisfy the specified interface.

	Error Condition	: Lack of memory.	

	@leave			KErrNoMemory

	@since			7.0

	@param			aInterfaceUid A UID specifying the required interface.

	@param			aResolverUid The CResolver implementation to use.

	@param			aExtendedInterfaces Identifies a set of zero or more extended interfaces to match. 

					Must match all extended interfaces for a match to occur.

	@param			aMessage Client's request					

	@return			RPointerArray<TUid>* A pointer to the array of class identification

					data.

					Ownership of the created array is returned to the caller,

					who must take the responsibility of destroying it. However, the caller must

					not destroy the list's contents as it is not owned by the list.	

	@pre 			CEComServer must have been fully constructed.

	@post			CEComServer has not changed, and RPointerArray<TUid>* contains the list

					of Implementations for the interface.		

 */

	RImplInfoArray* ListImplementationsL(TUid aInterfaceUid, 

										 TUid aResolverUid,

										 const RExtendedInterfacesArray& aExtendedInterfaces,

										 const TClientRequest& aMessage);

/**

	Intended Usage	:Instantiate an interface implementation to satisfy the 

					specified interface. 

	Error Condition	: Lack of memory, or not connected.	

	@leave			KErrNoMemory

	@leave			KErrNotConnected

	@since			7.0

	@param			aImplementationUid A UID specifying the required interface implementation.

	@param			aDllInfo containing the Dll info to be loaded on the client side

	@param			aInstanceKey A 32 bit identifer returned by ECom to

					identify this instance to the framework.

	@param			aClientRequest client's request

	@pre 			CEComServer must have been fully constructed.

	@post			The requested interface implementation is identified,

					and the instantiation method pointer is returned.

 */

	void GetResolvedDllInfoL(	const TUid aImplementationUid,

								TEntry& aDllInfo,

								TUid& aInstanceKey,

								const TClientRequest& aClientRequest);

/**

	Intended Usage	:Instantiate an interface implementation to satisfy the 

					specified interface. 

	Error Condition	: Lack of memory	

	@leave  		KErrNoMemory

	@since			7.0

	@param			aInterfaceUid A UID specifying the required interface.

	@param			aAdditionalParameters A descriptor specifying any additional

					implementation characteristics to be fulfilled.

	@param			aExtendedInterfaces Identifies a set of zero or more extended interfaces to match.

					Must match all extended interfaces for a match to occur.					

	@param			aDllInfo containing the Dll info to be loaded on the client side

	@param			aInstanceKey A 32 bit identifer returned by ECom to

					identify this instance to the framework.

	@param			aClientRequest client's request

	@pre 			CEComServer must have been fully constructed.

	@post			The requested interface implementation is identified,

					and the instantiation method pointer is returned.

 */

	void GetResolvedDllInfoL(	const TUid aInterfaceUid,

								const TEComResolverParams& aAdditionalParameters,

								const RExtendedInterfacesArray& aExtendedInterfaces,

								TEntry& aDllInfo,

								TUid& aInstanceKey,

								const TClientRequest& aClientRequest);

/**

	Intended Usage	:Instantiate an interface implementation to satisfy the 

					specified interface. 

					Overload with a client provided CResolver.

	Error Condition	: Lack of memory	

	@leave  		KErrNoMemory

	@since			7.0

	@param			aInterfaceUid A UID specifying the required interface.

	@param			aAdditionalParameters A descriptor specifying any additional

					implementation characteristics to be fulfilled.

	@param			aResolver A UID specifying the implementation of the CResolver interface

					with client defined behaviour to use for resolution.

	@param			aExtendedInterfaces Identifies a set of zero or more extended interfaces to match.

					Must match all extended interfaces for a match to occur.					

	@param			aDllInfo containing the Dll info to be loaded on the client side

	@param			aInstanceKey A 32 bit identifer returned by ECom to

					identify this instance to the framework.

	@param			aClientRequest client's request

	@pre 			CEComServer must have been fully constructed.

	@post			The requested interface implementation is identified,

					and the instantiation method pointer is returned.

 */

	void GetResolvedDllInfoL(   const TUid aInterfaceUid, 

								const TEComResolverParams& aAdditionalParameters,

								const TUid aResolverUid,

								const RExtendedInterfacesArray& aExtendedInterfaces,

								TEntry& aDllInfo,

								TUid& aInstanceKey,

								const TClientRequest& aClientRequest);

/**

	Get implementation info for one implementation, and return to client

	@param			aImplementationUid A UID specifying the required implementation.

	@param			aImplInfo Return value, implementation info for client. If the call succeeds,

					it will point to the found implementation information in registrydata. The function 

					does not return ownership of the pointer, so the caller must not destroy it.

	@param			aClientRequest client's request

 */							

	void GetImplementationInformationL(const TUid& aImplementationUid,

									   CImplementationInformation*& aImplInfo,

									   const TClientRequest& aClientRequest);

#ifdef __ECOM_SERVER_TESTABILITY__

/**

	This method is provided for testability. It allows the user to 

	simulate the domain manager behaviour. If the testing compile

	time flag __ECOM_SERVER_TESTABILITY__ is not defined the method

	is not accessible. If the flag is defined then it is responsible

	for setting the startup state. After the state is changed

	the ProcessCurrentStartupStateL() method should be called for 

	correct simulation of domain manager behaviour.

	@param aState the state to change to

*/

	void ChangeStartupStateL(TInt aState) const;

/**

	This method is provided for testability. It allows the user to 

	simulate the domain manager behaviour. If the testing compile

	time flag __ECOM_SERVER_TESTABILITY__ is not defined the method

	is not accessible. If the flag is defined then it is responsible

	for processing the startup state. ChangeStartupState() method 

	should be called prior to calling this method.

	@leave System-wide error codes, including KErrNoMemory.

*/

	void ProcessCurrentStartupStateL() const;

/**

	This method is provided for testability. It allows the user to 

	simulate the domain manager behaviour. If the testing compile

	time flag __ECOM_SERVER_TESTABILITY__ is not defined the method

	is not accessible. It is an accessor

	to test the current state of the ServerStartupManager.

	@return The current startup state of the CServerStartupManager.

*/

	TInt GetCurrentStartupState() const;

#endif //__ECOM_SERVER_TESTABILITY__

#ifdef __ECOM_SERVER_PERFORMANCE__

/**

	This method is provided for performance testability. If the testing 

	compile	time flag __ECOM_SERVER_PERFORMANCE__ is not defined the method

	is not accessible. It is an accessor to get the plugins counts discovered

	during the startup of EComServer.

	@param aType the type of counts to read

	@param aCounts the count readings

*/

	void GetRegistryCountsL(TInt aType, RegistryCounts::TRegistryCounts& aCounts) const;

#endif //__ECOM_SERVER_PERFORMANCE__

/**

	Intended Usage	: (Server Session management) Add a new session connection for a client.	

	Error Condition	: None.

	@since			7.0

	@pre 			CEComServer must have been fully constructed.

	@post			The new CEComServerSession to handle service provision for a new 

					ECom client has been recorded.

					If the server was preparing to shutdown, that shutdown is cancelled

 */

	void AddSession();

/**

	Intended Usage	: (Server Session management) Destroy a session connection with a client.	

	Error Condition	: None.

	@since			7.0

	@pre 			CEComServer must have been fully constructed.

	@post			The appropriate CEComServerSession has been destroyed and 

					the ECom client has been disconnected from this server.

 */

	void DropSession();

/**

	Intended Usage	: The overloaded method from the MRegistrarObserver class

					  Used for firing notifications to the client sessions that

					  the underlying registry data has changed.

	Error Condition	: None	

	@since			7.0

	@pre 			CEComServer must have been fully constructed.

	@post			The CEComServer has notified all its client sessions

					registered for notifications that the data changed. 

 */

	void Notification(TInt aNotificationCode);

/**

	Intended Usage	: Indicates whether the registry index is currently valid.  The 

					index will not be valid if discoveries are currently taking place.

					If the index is not currently valid then calls to 

					ListImplementationsL() cannot be serviced.

	Error Condition	: None.

	@return			ETrue if the index is currently valid, EFalse otherwise.

	@since			7.0

	@pre 			CEComServer is fully constructed

 */

	TBool RegistryIndexValid() const;

	// Callback function to be invoked by CDiscoverer and CRegistryData

	static TInt NotifyEvents(TAny* aObj, TInt aEvent, TAny* aData);

private:

/**

	@internalComponent

	Intended Usage	: Default c'tor	

	Error Condition	: None	

	@since			7.0

	@pre 			None

	@post			CEComServer is fully constructed

 */

	CEComServer();

/**

	Intended Usage	: Standardised 2nd, (Initialisation) phase of two 

					phase construction.

	Error Condition	: None	

	@leave  		KErrNoMemory

	@since			7.0

	@return			void 

	@pre 			CEComServer is fully constructed.

	@post			CEComServer is fully initialised.

 */

	void ConstructL();

/**

	Intended Usage	: Helper method to retrieve a list of all the 

					implementations which satisfy the specified interface. 

					Overload with a provided CResolver*.

	@leave  		KErrNoMemory

	@since			7.0

	@param			aInterfaceUid A UID specifying the required interface.

	@param			aAdditionalParameters A descriptor specifying any additional

					implementation characteristics to be fulfilled.

	@param			aResolver A CResolver with client defined behaviour.

	@return			RPointerArray<TUid>* A pointer to the array of class identification

					data. Ownership of the created array is returned to the caller,

					who must take the responsibility of destroying it. However, the caller must

					not destroy the list's contents as it is not owned by the list.

	@pre 			CEComServer must have been fully constructed.

	@post			CEComServer has not changed, and RPointerArray<TUid>* contains the list

					of Implementations for the interface.			

 */

	RImplInfoArray* ListImplementationsL(TUid aInterfaceUid, 

										 const TEComResolverParams& aAdditionalParameters, 

										 CResolver* aResolver) const;

/**

	Intended Usage	: Helper method to retrieve a list of all the 

					implementations which satisfy the specified interface. 

					Overload with a provided CResolver*.

	@leave  		KErrNoMemory

	@since			7.0

	@param			aInterfaceUid A UID specifying the required interface.

	@param			aResolver A CResolver with client defined behaviour.

	@return			A pointer to the array of class identification data. 

                 	Ownership of the created array is returned to the caller,

					who must take the responsibility of destroying it. However, the caller must

					not destroy the list's contents as it is not owned by the list.

	@pre 			CEComServer must have been fully constructed.

	@post			CEComServer has not changed, and RPointerArray<TUid>* contains the list

					of Implementations for the interface.		

 */

	RImplInfoArray* ListImplementationsL(TUid aInterfaceUid, 

										 CResolver* aResolver) const;

/**

	Intended Usage	: Creates a new CEComServerSession to handle client

					service requests.

	@leave			KErrNoMemory