WHAT CLASSES DOES THE CLIENT SERVER FRAMEWORK USE in Java

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WHAT CLASSES DOES THE CLIENT SERVER FRAMEWORK USE
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these pointers to the overloaded ReadL() and WriteL() methods7 of RMessage, which use kernel-mediated inter-process communication to transfer the data When the server has serviced a client request, it calls Complete() on the RMessage to notify the client This method wraps a call to RThread::Complete() on the client s thread handle The integer value passed to Complete() is written into the client s TRequestStatus value and the request semaphore for the client thread is signaled If you re wondering about synchronous SendReceive() requests from the client, which don t take a TRequestStatus parameter, take a look at Section 115 The Panic(), Terminate() and Kill() methods of RMessage are wrappers over the RThread methods of the same name and may be used by the server to stop the client thread under certain circumstances, such as client misbehavior due to a programming error The client and server run in separate threads which also typically run in different processes The address spaces of Symbian OS processes are protected and kernel-mediated data transfer must be used between the client and server
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DSession
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DSession is a kernel class; the D pre x means that it is a CBasederived kernel-side class On Symbian OS, each process is memory-mapped into a different address space, so it is protected from other processes One process cannot overwrite the memory of another The only process that can see all the physical memory in the system is the kernel process When a client calls RSessionBase::CreateSession(), the kernel establishes the connection between the client and the server and creates a DSession object to represent the session Each DSession object has a pointer to a kernel object representing the client thread (DThread) and a pointer to the kernel server object (DServer), as shown in Figure 112
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CSharableSession
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CSharableSession is an abstract base class that represents a session within the server For each RSessionBase-derived object on the client side, there is an associated CSharableSession-derived object on the server side
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7 These methods are simply wrappers over the ReadL() and WriteL() methods of RThread, as described in 10
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THE CLIENT SERVER FRAMEWORK IN THEORY
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DThread (Client) CLIENT PROCESS SERVER PROCESS RThread(Client) DServer holds a doubly linked list of DSession objects DServer
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CSharableSession CServer holds a doubly linked list of CSharableSession objects CServer DThread (Server)
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Symbian OS client- and server-side base classes
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class CSharableSession : public CBase { friend class CServer; public: IMPORT_C CSharableSession()=0; IMPORT_C virtual void CreateL(const CServer& aServer); inline const CServer* Server() const; inline const RMessage& Message() const; IMPORT_C void ResourceCountMarkStart(); IMPORT_C void ResourceCountMarkEnd(); IMPORT_C virtual TInt CountResources(); virtual void ServiceL(const RMessage& aMessage)=0; protected: IMPORT_C CSharableSession(); private: TInt iResourceCountMark; TDblQueLink iLink; const CServer* iServer; };
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WHAT CLASSES DOES THE CLIENT SERVER FRAMEWORK USE
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CSharableSession provides methods to access the CServerderived object, Server(), which I ll discuss shortly Message() can be used to access the next client request to process, if there any are outstanding If the server makes an asynchronous call to service the request and does not complete the request before returning from ServiceL(), the RMessage object must be stored so it can be completed at a later stage If it was not stored, when it came to complete the request, Message() would return a different message if other requests had been submitted to the server while the asynchronous request was being processed Classes derived from CSharableSession handle incoming client requests through their implementation of the pure virtual ServiceL() method Typically, this method should check the incoming message to see which request the client has submitted, then handle it by unpacking the message and using the incoming parameters accordingly When the request has been handled, the server calls RMessage::Complete() to notify the client thread of request completion The example code in 12 illustrates this You ll notice a set of resource-counting functions, ResourceCountMarkStart(), ResourceCountMarkEnd() and CountResources(), which have a default, do nothing implementation in the CSharableSession base class but which may be overridden by derived classes for customized resource checking at server startup and shutdown, usually used only in debug builds ResourceCountMarkStart() initializes server resource counting while ResourceCountMarkEnd() checks that the current number of server resources (eg subsessions) in use is equivalent to that when resource counting started If the values are not equal, the function panics the client thread associated with the most recent message CountResources() returns the number of server resources currently in use Prior to Symbian OS v60, class CSession represented a session on the server side The CSession class was thread-speci c and accessible only by a single thread on the client side Symbian OS v60 introduced the concept of sharable client server sessions From v60, a client session may potentially be shared between multiple threads in the same client process, although a server implementation is not required to support sharable sessions To support this modi cation, Symbian OS v60 introduced CSharableSession as the base class for a server-side session CSession still exists, deriving from CSharableSession, as an abstract class which provides a set of thread-speci c functions to transfer data between client and server
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