Examples with Dispatcher sun.rmi.server.Dispatcher used on opensource projects

Example 1 with Dispatcher

use of sun.rmi.server.Dispatcher in project jdk8u_jdk by JetBrains.

the class Transport method serviceCall.

/**
     * Service an incoming remote call. When a message arrives on the
     * connection indicating the beginning of a remote call, the
     * threads are required to call the <I>serviceCall</I> method of
     * their transport.  The default implementation of this method
     * locates and calls the dispatcher object.  Ordinarily a
     * transport implementation will not need to override this method.
     * At the entry to <I>tr.serviceCall(conn)</I>, the connection's
     * input stream is positioned at the start of the incoming
     * message.  The <I>serviceCall</I> method processes the incoming
     * remote invocation and sends the result on the connection's
     * output stream.  If it returns "true", then the remote
     * invocation was processed without error and the transport can
     * cache the connection.  If it returns "false", a protocol error
     * occurred during the call, and the transport should destroy the
     * connection.
     */
public boolean serviceCall(final RemoteCall call) {
    try {
        /* read object id */
        final Remote impl;
        ObjID id;
        try {
            id = ObjID.read(call.getInputStream());
        } catch (java.io.IOException e) {
            throw new MarshalException("unable to read objID", e);
        }
        /* get the remote object */
        Transport transport = id.equals(dgcID) ? null : this;
        Target target = ObjectTable.getTarget(new ObjectEndpoint(id, transport));
        if (target == null || (impl = target.getImpl()) == null) {
            throw new NoSuchObjectException("no such object in table");
        }
        final Dispatcher disp = target.getDispatcher();
        target.incrementCallCount();
        try {
            /* call the dispatcher */
            transportLog.log(Log.VERBOSE, "call dispatcher");
            final AccessControlContext acc = target.getAccessControlContext();
            ClassLoader ccl = target.getContextClassLoader();
            ClassLoader savedCcl = Thread.currentThread().getContextClassLoader();
            try {
                setContextClassLoader(ccl);
                currentTransport.set(this);
                try {
                    java.security.AccessController.doPrivileged(new java.security.PrivilegedExceptionAction<Void>() {

                        public Void run() throws IOException {
                            checkAcceptPermission(acc);
                            disp.dispatch(impl, call);
                            return null;
                        }
                    }, acc);
                } catch (java.security.PrivilegedActionException pae) {
                    throw (IOException) pae.getException();
                }
            } finally {
                setContextClassLoader(savedCcl);
                currentTransport.set(null);
            }
        } catch (IOException ex) {
            transportLog.log(Log.BRIEF, "exception thrown by dispatcher: ", ex);
            return false;
        } finally {
            target.decrementCallCount();
        }
    } catch (RemoteException e) {
        // if calls are being logged, write out exception
        if (UnicastServerRef.callLog.isLoggable(Log.BRIEF)) {
            // include client host name if possible
            String clientHost = "";
            try {
                clientHost = "[" + RemoteServer.getClientHost() + "] ";
            } catch (ServerNotActiveException ex) {
            }
            String message = clientHost + "exception: ";
            UnicastServerRef.callLog.log(Log.BRIEF, message, e);
        }
        /* We will get a RemoteException if either a) the objID is
             * not readable, b) the target is not in the object table, or
             * c) the object is in the midst of being unexported (note:
             * NoSuchObjectException is thrown by the incrementCallCount
             * method if the object is being unexported).  Here it is
             * relatively safe to marshal an exception to the client
             * since the client will not have seen a return value yet.
             */
        try {
            ObjectOutput out = call.getResultStream(false);
            UnicastServerRef.clearStackTraces(e);
            out.writeObject(e);
            call.releaseOutputStream();
        } catch (IOException ie) {
            transportLog.log(Log.BRIEF, "exception thrown marshalling exception: ", ie);
            return false;
        }
    }
    return true;
}