diff -r 000000000000 -r bde4ae8d615e os/persistentdata/traceservices/tracefw/ulogger/inc/uloggerinputplugin.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/os/persistentdata/traceservices/tracefw/ulogger/inc/uloggerinputplugin.h	Fri Jun 15 03:10:57 2012 +0200
@@ -0,0 +1,119 @@
+// Copyright (c) 2007-2009 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:
+// ULogger input plug-in interface
+// 
+//
+
+/**
+ @file
+ @publishedPartner
+ @prototype
+*/
+
+#ifndef ULOGGERINPUTPLUGIN_H
+#define ULOGGERINPUTPLUGIN_H
+
+#include <e32base.h>
+#include "uloggerplugin.h"
+#include "uloggerdatatypes.h"
+
+namespace Ulogger
+{
+
+//! Abstract class for input plug-ins.
+/*!
+A ULogger input plug-in listens for ULogger commands on some communication
+medium, such as serial, usb or a TCP socket. Whenever a command is received
+by the input plug-in, it passes this command to ULogger, which then interprets
+the command, acts on it, and returns a response to the input plug-in. The input
+plug-in sends any response coming from ULogger back to the client that sent
+the command in the first place.
+
+All input plug-ins must derive from this class in order to be compatible with
+ULogger. They must also derive from ULogger::CPlugin (whose header is already
+included by this header, for convenience) in order to be compatible with the
+ECom framework, which ULogger uses to load its input plug-ins.
+*/
+class MInputPlugin
+	{
+public:
+	/**
+	Asynchronous method that reads command data from the input medium. ULogger
+	calls this when it's ready to receive command data from the input plug-in.
+	When the input plug-in completes the read operation it notifies the caller
+	via the TRequestStatus that is passed into this method by reference. It
+	provides the command data that has been received in the descriptor that is
+	passed into this method by reference.
+	Input plug-ins typically implement this method by simply passing the
+	TRequestStatus and descriptor arguments on to another asynchronous method,
+	such as for example a socket's ReadOneOrMore method.
+
+	@param aStatus The request status used to contain completion information for
+	               the function. On completion, contains a system-wide error
+	               code.
+	@param aData A descriptor reference to store data obtained from input
+	             channel.
+	@return KErrNone if operation was finished without any problems, system wide
+	                 error code otherwise.
+	*/
+	virtual TInt ReadData(TRequestStatus& aStatus, TDes8& aData) = 0;
+
+	/** Cancels asynchronous operation issued by ReadData method. */
+	virtual void CancelReadData() = 0;
+
+	/**
+	Synchronous Method that sends the given acknowledgment data back to the
+	client that is sending command data to the input plug-in. ULogger calls this
+	method whenever it needs to send a response to a previously received
+	command.
+
+	@param aData A descriptor which contains error code or other results, for
+	             example, array of filters.
+	Format of this data depends on previously obtained command.
+	@return KErrNone is send operation finished with success otherwise
+	                 system wide error code.
+	*/
+	virtual TInt SendAcknowledgment(const TDesC8& aData) = 0;
+
+	/**
+	Called by ULogger as first method after construction or after changes in
+	config file. This allows the input plug-in to initialize itself with its
+	private settings.
+
+	@param aConfigs actual configurations valid for this instance
+	@return KErrNone, if successful; otherwise one of the other system wide
+	        error codes.
+	*/
+	virtual TInt ConfigureInputPlugin(const RPointerArray<TPluginConfiguration>& aConfigs) = 0; 
+
+	/**
+	Called by ULogger to indicate that the input plug-in must flush all buffers
+	and release any locked resources. Any resources may be locked only after any
+	other method is called.
+	*/
+	virtual void CloseInputPlugin() = 0;
+
+	/**	Virtual destructor.	*/
+	virtual ~MInputPlugin(){}
+
+	/**
+	Input plug-in interface id. This is for ULogger to distinguish between the
+	different types of plug-ins (e.g. Intput vs Output plug-ins).
+	*/
+	static const CPlugin::TPluginInterface iInterfaceId = CPlugin::EInput;
+	};
+
+} //end of namespace
+
+#endif /* ULOGGERINPUTPLUGIN_H */