jdk/src/java.rmi/share/classes/sun/rmi/transport/StreamRemoteCall.java
author rriggs
Thu, 16 Mar 2017 16:16:31 -0400
changeset 45984 75fef64e21fa
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8163958: Improved garbage collection Reviewed-by: smarks, chegar, skoivu, rhalade
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/*
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 * Copyright (c) 1996, 2017, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.  Oracle designates this
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 * particular file as subject to the "Classpath" exception as provided
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 * by Oracle in the LICENSE file that accompanied this code.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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package sun.rmi.transport;
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import java.io.DataInputStream;
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import java.io.DataOutputStream;
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import java.io.IOException;
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import java.io.ObjectInput;
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import java.io.ObjectOutput;
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import java.io.StreamCorruptedException;
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import java.rmi.RemoteException;
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import java.rmi.MarshalException;
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import java.rmi.UnmarshalException;
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import java.rmi.server.ObjID;
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import java.rmi.server.RemoteCall;
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import sun.rmi.runtime.Log;
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import sun.rmi.server.UnicastRef;
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import sun.rmi.transport.tcp.TCPEndpoint;
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/**
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 * Stream-based implementation of the RemoteCall interface.
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 *
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 * @author Ann Wollrath
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 */
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@SuppressWarnings("deprecation")
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public class StreamRemoteCall implements RemoteCall {
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    private ConnectionInputStream in = null;
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    private ConnectionOutputStream out = null;
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    private Connection conn;
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    private boolean resultStarted = false;
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    private Exception serverException = null;
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    public StreamRemoteCall(Connection c) {
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        conn = c;
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    }
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    public StreamRemoteCall(Connection c, ObjID id, int op, long hash)
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        throws RemoteException
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    {
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        try {
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            conn = c;
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            Transport.transportLog.log(Log.VERBOSE,
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                "write remote call header...");
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            // write out remote call header info...
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            // call header, part 1 (read by Transport)
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            conn.getOutputStream().write(TransportConstants.Call);
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            getOutputStream();           // creates a MarshalOutputStream
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            id.write(out);               // object id (target of call)
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            // call header, part 2 (read by Dispatcher)
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            out.writeInt(op);            // method number (operation index)
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            out.writeLong(hash);         // stub/skeleton hash
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        } catch (IOException e) {
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            throw new MarshalException("Error marshaling call header", e);
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        }
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    }
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    /**
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     * Return the connection associated with this call.
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     */
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    public Connection getConnection() {
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        return conn;
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    }
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    /**
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     * Return the output stream the stub/skeleton should put arguments/results
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     * into.
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     */
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    public ObjectOutput getOutputStream() throws IOException {
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        return getOutputStream(false);
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    }
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    private ObjectOutput getOutputStream(boolean resultStream)
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        throws IOException
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    {
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        if (out == null) {
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            Transport.transportLog.log(Log.VERBOSE, "getting output stream");
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            out = new ConnectionOutputStream(conn, resultStream);
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        }
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        return out;
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    }
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    /**
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     * Release the outputStream  Currently, will not complain if the
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     * output stream is released more than once.
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     */
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    public void releaseOutputStream() throws IOException {
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        try {
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            if (out != null) {
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                try {
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                    out.flush();
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                } finally {
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                    out.done();         // always start DGC ack timer
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                }
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            }
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            conn.releaseOutputStream();
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        } finally {
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            out = null;
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        }
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    }
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    /**
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     * Get the InputStream the stub/skeleton should get results/arguments
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     * from.
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     */
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    public ObjectInput getInputStream() throws IOException {
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        if (in == null) {
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            Transport.transportLog.log(Log.VERBOSE, "getting input stream");
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            in = new ConnectionInputStream(conn.getInputStream());
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        }
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        return in;
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    }
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    /**
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     * Release the input stream, this would allow some transports to release
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     * the channel early.
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     */
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    public void releaseInputStream() throws IOException {
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        /* WARNING: Currently, the UnicastRef.java invoke methods rely
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         * upon this method not throwing an IOException.
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         */
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        try {
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            if (in != null) {
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                // execute MarshalInputStream "done" callbacks
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                try {
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                    in.done();
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                } catch (RuntimeException e) {
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                }
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                // add saved references to DGC table
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                in.registerRefs();
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                /* WARNING: The connection being passed to done may have
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                 * already been freed.
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                 */
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                in.done(conn);
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            }
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            conn.releaseInputStream();
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        } finally {
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            in = null;
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        }
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    }
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    /**
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     * Discard any post-processing of refs the InputStream.
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     */
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    public void discardPendingRefs() {
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        in.discardRefs();
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    }
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    /**
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     * Returns an output stream (may put out header information
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     * relating to the success of the call).
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     * @param success If true, indicates normal return, else indicates
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     * exceptional return.
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     * @exception StreamCorruptedException If result stream previously
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     * acquired
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     * @exception IOException For any other problem with I/O.
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     */
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    public ObjectOutput getResultStream(boolean success) throws IOException {
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        /* make sure result code only marshaled once. */
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        if (resultStarted)
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            throw new StreamCorruptedException("result already in progress");
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        else
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            resultStarted = true;
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        // write out return header
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        // return header, part 1 (read by Transport)
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        DataOutputStream wr = new DataOutputStream(conn.getOutputStream());
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        wr.writeByte(TransportConstants.Return);// transport op
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        getOutputStream(true);  // creates a MarshalOutputStream
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        // return header, part 2 (read by client-side RemoteCall)
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        if (success)            //
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            out.writeByte(TransportConstants.NormalReturn);
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        else
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            out.writeByte(TransportConstants.ExceptionalReturn);
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        out.writeID();          // write id for gcAck
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        return out;
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    }
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    /**
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     * Do whatever it takes to execute the call.
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     */
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    @SuppressWarnings("fallthrough")
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    public void executeCall() throws Exception {
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        byte returnType;
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        // read result header
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        DGCAckHandler ackHandler = null;
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        try {
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            if (out != null) {
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                ackHandler = out.getDGCAckHandler();
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            }
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            releaseOutputStream();
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            DataInputStream rd = new DataInputStream(conn.getInputStream());
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            byte op = rd.readByte();
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            if (op != TransportConstants.Return) {
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                if (Transport.transportLog.isLoggable(Log.BRIEF)) {
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                    Transport.transportLog.log(Log.BRIEF,
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                        "transport return code invalid: " + op);
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                }
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                throw new UnmarshalException("Transport return code invalid");
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            }
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            getInputStream();
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            returnType = in.readByte();
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            in.readID();        // id for DGC acknowledgement
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        } catch (UnmarshalException e) {
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            throw e;
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        } catch (IOException e) {
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            throw new UnmarshalException("Error unmarshaling return header",
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                                         e);
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        } finally {
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            if (ackHandler != null) {
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                ackHandler.release();
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            }
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        }
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        // read return value
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        switch (returnType) {
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        case TransportConstants.NormalReturn:
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            break;
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        case TransportConstants.ExceptionalReturn:
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            Object ex;
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            try {
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                ex = in.readObject();
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            } catch (Exception e) {
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                throw new UnmarshalException("Error unmarshaling return", e);
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            }
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            // An exception should have been received,
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            // if so throw it, else flag error
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            if (ex instanceof Exception) {
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                exceptionReceivedFromServer((Exception) ex);
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            } else {
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                throw new UnmarshalException("Return type not Exception");
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            }
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            // Exception is thrown before fallthrough can occur
2
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        default:
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            if (Transport.transportLog.isLoggable(Log.BRIEF)) {
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                Transport.transportLog.log(Log.BRIEF,
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                    "return code invalid: " + returnType);
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            }
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            throw new UnmarshalException("Return code invalid");
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        }
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    }
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    /**
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     * Routine that causes the stack traces of remote exceptions to be
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     * filled in with the current stack trace on the client.  Detail
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     * exceptions are filled in iteratively.
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     */
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    protected void exceptionReceivedFromServer(Exception ex) throws Exception {
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        serverException = ex;
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        StackTraceElement[] serverTrace = ex.getStackTrace();
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        StackTraceElement[] clientTrace = (new Throwable()).getStackTrace();
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        StackTraceElement[] combinedTrace =
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            new StackTraceElement[serverTrace.length + clientTrace.length];
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        System.arraycopy(serverTrace, 0, combinedTrace, 0,
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                         serverTrace.length);
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        System.arraycopy(clientTrace, 0, combinedTrace, serverTrace.length,
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                         clientTrace.length);
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        ex.setStackTrace(combinedTrace);
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        /*
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         * Log the details of a server exception thrown as a result of a
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         * remote method invocation.
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         */
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        if (UnicastRef.clientCallLog.isLoggable(Log.BRIEF)) {
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            /* log call exception returned from server before it is rethrown */
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            TCPEndpoint ep = (TCPEndpoint) conn.getChannel().getEndpoint();
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            UnicastRef.clientCallLog.log(Log.BRIEF, "outbound call " +
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                "received exception: [" + ep.getHost() + ":" +
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                ep.getPort() + "] exception: ", ex);
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        }
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        throw ex;
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    }
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    /*
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     * method to retrieve possible server side exceptions (which will
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     * be throw from exceptionReceivedFromServer(...) )
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     */
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    public Exception getServerException() {
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        return serverException;
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    }
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    public void done() throws IOException {
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        /* WARNING: Currently, the UnicastRef.java invoke methods rely
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         * upon this method not throwing an IOException.
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         */
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        releaseInputStream();
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    }
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}