Initial revision

From-SVN: r102074

libjava/classpath/gnu/java/rmi/server/UnicastRemoteCall.java

@@ -0,0 +1,525 @@
+/* UnicastRemoteCall.java
+   Copyright (c) 1996, 1997, 1998, 1999, 2002, 2004, 2005
+   Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package gnu.java.rmi.server;
+
+import java.io.DataInputStream;
+import java.io.DataOutputStream;
+import java.io.IOException;
+import java.io.ObjectInput;
+import java.io.ObjectOutput;
+import java.io.StreamCorruptedException;
+import java.rmi.MarshalException;
+import java.rmi.RemoteException;
+import java.rmi.UnmarshalException;
+import java.rmi.server.ObjID;
+import java.rmi.server.RemoteCall;
+import java.rmi.server.UID;
+import java.util.Vector;
+
+public class UnicastRemoteCall
+	implements RemoteCall, ProtocolConstants
+{
+
+  private UnicastConnection conn;
+  private Object result;
+  private Object object;
+  private int opnum;
+  private long hash;
+  // These are package-private due to inner class access.
+  Vector vec;
+  int ptr;
+  private ObjID objid;
+
+  private ObjectOutput oout;
+  private ObjectInput oin;
+
+  /**
+   * Incoming call.
+   */
+  UnicastRemoteCall(UnicastConnection conn)
+  {
+    this.conn = conn;
+  }
+
+  /**
+   * Outgoing call.
+   */
+  UnicastRemoteCall(UnicastConnection conn, ObjID objid, int opnum, long hash)
+    throws RemoteException
+  {
+    this.conn = conn;
+    this.opnum = opnum;
+    this.hash = hash;
+    this.objid = objid;
+  }
+  
+  UnicastConnection getConnection()
+  {
+    return conn;
+  }
+  
+  public ObjectOutput getOutputStream() throws IOException
+  {
+    if (vec == null)
+      vec = new Vector();
+    return (new DummyObjectOutputStream());
+  }
+
+  public void releaseOutputStream() throws IOException
+  {
+    if (vec != null)
+      {
+	oout = conn.getObjectOutputStream();
+	
+	for (int i = 0; i < vec.size(); i += 2)
+	  {
+	    boolean primitive = ((Boolean)vec.elementAt(i)).booleanValue();
+	    Object data = vec.elementAt(i+1);
+
+	    // No type, this is
+	    if (!primitive)
+	      oout.writeObject(data);
+	    else
+	      {
+		if (data instanceof Boolean)
+		  oout.writeBoolean(((Boolean)data).booleanValue());
+		else if (data instanceof Character)
+		  oout.writeChar(((Character)data).charValue());
+		else if (data instanceof Byte)
+		  oout.writeByte(((Byte)data).byteValue());
+		else if (data instanceof Short)
+		  oout.writeShort(((Short)data).shortValue());
+		else if (data instanceof Integer)
+		  oout.writeInt(((Integer)data).intValue());
+		else if (data instanceof Long)
+		  oout.writeLong(((Long)data).longValue());
+	      }
+	  }
+	vec = null;
+      }
+    if(oout != null)
+      oout.flush();
+  }
+
+  /**
+  *
+  * (re)starts ObjectInputStream
+  *
+  */ 
+  public ObjectInput startInputStream() throws IOException
+  {
+	if (conn != null) {
+		return (oin = conn.startObjectInputStream());
+	} else {
+		return getInputStream(); // dummy Input Stream
+	}
+
+  }
+
+  public ObjectInput getInputStream() throws IOException
+  {
+    if (conn != null)
+      {
+	if(oin == null)
+	  return (oin = conn.getObjectInputStream());
+	else
+	  return oin;
+      }
+    else
+      {
+	ptr = 0;
+	return (new DummyObjectInputStream());
+      }
+  }
+
+  public void releaseInputStream() throws IOException
+  {
+    // Does nothing.
+  }
+
+  public ObjectOutput getResultStream(boolean success)
+    throws IOException, StreamCorruptedException
+  {
+    vec = new Vector();
+    return new DummyObjectOutputStream();
+  }
+  
+  public void executeCall() throws Exception
+  {
+    byte returncode;
+    ObjectInput oin;
+    
+    // signal the call when constructing
+    try
+      {
+	DataOutputStream dout = conn.getDataOutputStream();
+	dout.write(MESSAGE_CALL);
+	
+	oout = conn.startObjectOutputStream(); // (re)start ObjectOutputStream
+	objid.write(oout);
+	oout.writeInt(opnum);
+	oout.writeLong(hash);
+      }
+    catch(IOException ex)
+      {
+	throw new MarshalException("Try to write header but failed.", ex);
+      }
+
+    try
+      {
+	releaseOutputStream();
+	DataInputStream din = conn.getDataInputStream();
+        if (din.readByte() != MESSAGE_CALL_ACK)
+	    throw new RemoteException("Call not acked");
+
+        oin = startInputStream();
+        returncode = oin.readByte();
+        UID.read(oin);
+      }
+    catch(IOException ex)
+      {
+        throw new UnmarshalException("Try to read header but failed:", ex);
+      }
+    
+    //check return code
+    switch(returncode)
+      {
+      case RETURN_ACK: //it's ok
+	return;
+      case RETURN_NACK:
+	Object returnobj;
+	try
+	  {
+	    returnobj = oin.readObject();
+	  }
+	catch(Exception ex2)
+	  {
+	    throw new UnmarshalException
+	      ("Try to read exception object but failed", ex2);
+	  }
+	
+	if(!(returnobj instanceof Exception))
+	  throw new UnmarshalException("Should be Exception type here: "
+				       + returnobj);
+	throw (Exception)returnobj;
+	
+      default:
+	throw new UnmarshalException("Invalid return code");
+      }
+  }
+
+  public void done() throws IOException
+  {
+    // conn.disconnect();
+  }
+
+  boolean isReturnValue()
+  {
+    return vec.size() > 0;
+  }
+  
+  Object returnValue()
+  {
+    // This is not the first one (Boolean) but the second.
+    return vec.elementAt(1);
+  }
+
+  Object[] getArguments()
+  {
+    return vec.toArray();
+  }
+
+  Object getObject()
+  {
+    return object;
+  }
+
+  int getOpnum()
+  {
+    return opnum;
+  }
+
+  long getHash()
+  {
+    return hash;
+  }
+
+  void setReturnValue(Object obj)
+  {
+    vec.removeAllElements();
+    vec.addElement(obj);
+  }
+
+  /**
+   * Dummy object output class.
+   */
+  private class DummyObjectOutputStream implements ObjectOutput
+  {
+    /**
+     * Non-private constructor to reduce bytecode emitted.
+     */
+    DummyObjectOutputStream()
+    {
+    }
+
+    public void writeBoolean(boolean v) throws IOException
+    {
+      vec.addElement(Boolean.TRUE);
+      vec.addElement(Boolean.valueOf(v));
+    }
+
+    public void writeByte(int v) throws IOException
+    {
+      vec.addElement(Boolean.TRUE);
+      vec.addElement(new Byte((byte) v));
+    }
+
+    public void writeChar(int v) throws IOException
+    {
+      vec.addElement(Boolean.TRUE);
+      vec.addElement(new Character((char) v));
+    }
+
+    public void writeDouble(double v) throws IOException
+    {
+      vec.addElement(Boolean.TRUE);
+      vec.addElement(new Double(v));
+    }
+
+    public void writeFloat(float v) throws IOException
+    {
+      vec.addElement(Boolean.TRUE);
+      vec.addElement(new Float(v));
+    }
+
+    public void writeInt(int v) throws IOException
+    {
+      vec.addElement(Boolean.TRUE);
+      vec.addElement(new Integer(v));
+    }
+
+    public void writeLong(long v) throws IOException
+    {
+      vec.addElement(Boolean.TRUE);
+      vec.addElement(new Long(v));
+    }
+
+    public void writeShort(int v) throws IOException
+    {
+      vec.addElement(Boolean.TRUE);
+      vec.addElement(new Short((short) v));
+    }
+
+    public void writeObject(Object obj) throws IOException
+    {
+      vec.addElement(Boolean.FALSE);
+      vec.addElement(obj);
+    }
+
+    public void write(byte b[]) throws IOException
+    {
+      throw new IOException("not required");
+    }
+
+    public void write(byte b[], int off, int len) throws IOException
+    {
+      throw new IOException("not required");
+    }
+
+    public void write(int b) throws IOException
+    {
+      throw new IOException("not required");
+    }
+
+    public void writeBytes(String s) throws IOException
+    {
+      throw new IOException("not required");
+    }
+
+    public void writeChars(String s) throws IOException
+    {
+      throw new IOException("not required");
+    }
+
+    public void writeUTF(String str) throws IOException
+    {
+      throw new IOException("not required");
+    }
+
+    public void flush() throws IOException
+    {
+    }
+
+    public void close() throws IOException
+    {
+    }
+  } // class DummyObjectOutputStream
+
+  /**
+   * Dummy object input class.
+   */
+  private class DummyObjectInputStream implements ObjectInput
+  {
+    /**
+     * Non-private constructor to reduce bytecode emitted.
+     */
+    DummyObjectInputStream()
+    {
+    }
+
+    public boolean readBoolean() throws IOException
+    {
+      Object obj = vec.elementAt(ptr++);
+      return ((Boolean) obj).booleanValue();
+    }
+
+    public byte readByte() throws IOException
+    {
+      Object obj = vec.elementAt(ptr++);
+      return ((Byte) obj).byteValue();
+    }
+
+    public char readChar() throws IOException
+    {
+      Object obj = vec.elementAt(ptr++);
+      return ((Character) obj).charValue();
+    }
+
+    public double readDouble() throws IOException
+    {
+      Object obj = vec.elementAt(ptr++);
+      return ((Double) obj).doubleValue();
+    }
+
+    public float readFloat() throws IOException
+    {
+      Object obj = vec.elementAt(ptr++);
+      return ((Float) obj).floatValue();
+    }
+
+    public int readInt() throws IOException
+    {
+      Object obj = vec.elementAt(ptr++);
+      return ((Integer) obj).intValue();
+    }
+
+    public long readLong() throws IOException
+    {
+      Object obj = vec.elementAt(ptr++);
+      return ((Long) obj).longValue();
+    }
+
+    public short readShort() throws IOException
+    {
+      Object obj = vec.elementAt(ptr++);
+      return ((Short) obj).shortValue();
+    }
+
+    public Object readObject() throws IOException
+    {
+      return vec.elementAt(ptr++);
+    }
+
+    public int read(byte b[]) throws IOException
+    {
+      throw new IOException("not required");
+    }
+
+    public int read(byte b[], int off, int len) throws IOException
+    {
+      throw new IOException("not required");
+    }
+
+    public int read() throws IOException
+    {
+      throw new IOException("not required");
+    }
+
+    public long skip(long n) throws IOException
+    {
+      throw new IOException("not required");
+    }
+
+    public int available() throws IOException
+    {
+      throw new IOException("not required");
+    }
+
+    public void readFully(byte b[]) throws IOException
+    {
+      throw new IOException("not required");
+    }
+
+    public void readFully(byte b[], int off, int len) throws IOException
+    {
+      throw new IOException("not required");
+    }
+
+    public String readLine() throws IOException
+    {
+      throw new IOException("not required");
+    }
+
+    public String readUTF() throws IOException
+    {
+      throw new IOException("not required");
+    }
+
+    public int readUnsignedByte() throws IOException
+    {
+      throw new IOException("not required");
+    }
+
+    public int readUnsignedShort() throws IOException
+    {
+      throw new IOException("not required");
+    }
+
+    public int skipBytes(int n) throws IOException
+    {
+      throw new IOException("not required");
+    }
+
+    public void close() throws IOException
+    {
+    }
+  } // class DummyObjectInputStream
+
+}