How Many Connections Can a Client Have in Java

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A client can have multiple connections to a server through one or more sessions as follows: Each connection can use a separate client server session opened by a call to RSessionBase::CreateSession() The sessions are independent of any other within the client thread, and each maintains its own context That is, each client session has a corresponding CSharableSession object in the server and DSession object in the kernel Use of multiple client sessions where they are not strictly necessary should be limited to reduce the number of kernel and server resources consumed I ll discuss this further later in this chapter The client may create a number of subsessions within a single session (the use of subsessions is described in Section 1114) Client server communication occurs via the owning session, using a unique handle to identify each individual subsession The use of separate subsessions is more lightweight than separate sessions because it uses fewer kernel resources However, they are more complex to implement server-side The server may support sharable sessions Up to 255 threads in a client process may share a single session
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Typically, a class used to access a server has a termination method, which is usually called Close() Internally, this method will call RHandleBase::Close(), which sends a disconnection message to the server and sets the session handle to zero On receipt of this message,
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the server ends its session with the client by destroying the associated CSharableSession-derived object (in addition, the kernel will destroy the DSession object which represents the session) If the client has any outstanding requests when Close() is called, they are not guaranteed to be completed
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119 What Happens If a Client Dies
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For a non-sharable session, if the client dies without calling Close(), the kernel sends a disconnection message to the server to allow it to cleanup sessions associated with that client thread The kernel performs its thread-death cleanup by walking the queue of DSession objects and destroying any associated with the dead client thread If the session is sharable, the death of a single client thread does not close the session the session is effectively process-relative by virtue of being sharable To destroy the session, either the client process must terminate or the session must be closed explicitly on the client-side by a call to Close() on an RSessionBase handle
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If a server dies, the kernel will complete any waiting client requests with the error code KErrServerTerminated This gives the client an opportunity to handle request failure and cleanup, destroying any RSessionBase objects open on the server Even if the server is restarted, previous client sessions cannot be reused without rst being reconnected to it, so the only valid operation is to call Close()
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A session between a client and a server is between one or more client threads and a separate server thread Client code runs in user-mode threads It submits requests to server code which also runs in user mode The channel of communication between client and server is mediated by the kernel The Symbian OS server model is thread-based, allowing a server to run either in a separate process to the client, for greater isolation between client and server, or in the same process, to avoid the overhead of inter-process client server communication
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The responsiveness of a server can be de ned as the maximum time required to process a client message or the maximum time required to respond to an event on some device that it controls The server uses non-pre-emptive active-object event-handling (described in s 8 and 9) The response time is determined by the longest possible RunL() event-handler method of any active object running on the server thread, because an active object cannot be pre-empted when it is handling an event If a client makes a request while the server thread is already handling an event in a RunL() method, it runs to completion before the client request can be serviced This is also true for external events occurring from resources owned by the server Thus, if you want to write a highperformance server, there should be no long-running RunL() methods in any active objects in the server s main thread This includes processing in the ServiceL() method of the CSharableSession-derived class, which is called by CServer::RunL() This means that long-running operations must be performed by a separate thread or server Furthermore, the priority of a server thread should be chosen according to the maximum guaranteed response time, that is, the longest RunL() method of the server You should not give a high priority to a server thread that performs lots of processing in its event handler, since it may block threads with more appropriately chosen, lower, priorities
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