utildelegateimpl.java

gcc的组建

/* UtilDelegateImpl.java --
   Copyright (C) 2002, 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.javax.rmi.CORBA;

import gnu.CORBA.Minor;
import gnu.CORBA.ObjectCreator;
import gnu.CORBA.Poa.ORB_1_4;
import gnu.CORBA.Poa.AOM;
import gnu.CORBA.Poa.gnuPOA;
import gnu.CORBA.typecodes.GeneralTypeCode;

import org.omg.CORBA.Any;
import org.omg.CORBA.BAD_PARAM;
import org.omg.CORBA.COMM_FAILURE;
import org.omg.CORBA.CompletionStatus;
import org.omg.CORBA.INVALID_TRANSACTION;
import org.omg.CORBA.INV_OBJREF;
import org.omg.CORBA.MARSHAL;
import org.omg.CORBA.NO_PERMISSION;
import org.omg.CORBA.OBJECT_NOT_EXIST;
import org.omg.CORBA.OMGVMCID;
import org.omg.CORBA.ORB;
import org.omg.CORBA.SystemException;
import org.omg.CORBA.TCKind;
import org.omg.CORBA.TRANSACTION_REQUIRED;
import org.omg.CORBA.TRANSACTION_ROLLEDBACK;
import org.omg.CORBA.TypeCode;
import org.omg.CORBA.UNKNOWN;
import org.omg.CORBA.portable.InputStream;
import org.omg.CORBA.portable.OutputStream;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.rmi.AccessException;
import java.rmi.MarshalException;
import java.rmi.NoSuchObjectException;
import java.rmi.Remote;
import java.rmi.RemoteException;
import java.rmi.ServerError;
import java.rmi.ServerException;
import java.rmi.UnexpectedException;
import java.rmi.server.RMIClassLoader;
import java.util.Hashtable;

import javax.rmi.CORBA.Stub;
import javax.rmi.CORBA.Tie;
import javax.rmi.CORBA.Util;
import javax.rmi.CORBA.UtilDelegate;
import javax.rmi.CORBA.ValueHandler;
import javax.transaction.InvalidTransactionException;
import javax.transaction.TransactionRequiredException;
import javax.transaction.TransactionRolledbackException;

/**
 * The implementation of UtilDelegate.
 * 
 * @author Wu Gansha ([e-mail]) (stub)
 * @author Audrius Meskauskas ([e-mail]) (implementation)
 */
public class UtilDelegateImpl
  extends RmiUtilities
  implements UtilDelegate
{
  /**
   * The instance of the value handler, requested once.
   */
  static ValueHandler m_ValueHandler;

  /**
   * The global map of all ties to they records.
   */
  static Hashtable m_Ties = new Hashtable();

  /**
   * The global map of all targets to they records.
   */
  static Hashtable m_Targets = new Hashtable();

  /**
   * The standard package for that the exception names are omitted.
   */
  static final String m_StandardPackage = "org.omg.CORBA.";

  /**
   * Make a deep copy of the object.
   */
  public Object copyObject(Object obj, ORB orb)
    throws RemoteException
  {
    // Strings are immutable, can be shared.
    if (obj instanceof String)
      return obj;
    else if (obj == null)
      return null;
    else if (obj instanceof String[] || obj instanceof String[][]
      || obj instanceof String[][][])
      {
        // String arrays can be just cloned.
        return ((Object[]) obj).clone();
      }
    else if (obj instanceof Serializable)
      {
        try
          {
            ByteArrayOutputStream a = new ByteArrayOutputStream();
            ObjectOutputStream ou = new ObjectOutputStream(a);
            ou.writeObject(obj);
            ou.close();
            ObjectInputStream input = new ObjectInputStream(
              new ByteArrayInputStream(a.toByteArray()));
            return input.readObject();
          }
        catch (Exception ex)
          {
            RemoteException rex = new RemoteException("Cannot copy " + obj);
            throw rex;
          }
      }
    else
      return obj;
  }

  /**
   * Make a deep copy of the object array.
   */
  public Object[] copyObjects(Object[] obj, ORB orb)
    throws RemoteException
  {
    return (Object[]) copyObject(obj, orb);
  }

  public ValueHandler createValueHandler()
  {
    if (m_ValueHandler == null)
      m_ValueHandler = (ValueHandler) DelegateFactory.getInstance(DelegateFactory.VALUEHANDLER);
    return m_ValueHandler;
  }

  /**
   * Returns the codebase of the given class.
   */
  public String getCodebase(Class clz)
  {
    return RMIClassLoader.getClassAnnotation(clz);
  }

  /**
   * Get the Tie that handles invocations on the given target. If the target/Tie
   * pair has not been previously registered using {@link #registerTarget},
   * this method tries to locate a tie class by the name pattern. If this
   * succeeds, the tie-target pair is also registered.
   * 
   * @return the Tie.
   */
  public Tie getTie(Remote target)
  {
    synchronized (m_Targets)
      {
        Tie tie;
        TieTargetRecord r = ((TieTargetRecord) m_Targets.get(target));
        if (r == null)
          {
            if (target instanceof Stub)
              {
                tie = StubDelegateImpl.getTieFromStub(target);
                registerTarget(tie, target);
              }
            else
              {
                // Treat this as implementation.
                String tieClassName = getTieClassName(target.getClass().getName());
                try
                  {
                    Class tieClass = Util.loadClass(tieClassName, null,
                      target.getClass().getClassLoader());
                    tie = (Tie) tieClass.newInstance();
                  }
                catch (Exception e)
                  {
                    MARSHAL m = new MARSHAL("Unable to instantiate "
                      + tieClassName);
                    m.minor = Minor.TargetConversion;
                    m.initCause(e);
                    throw m;
                  }
                tie.setTarget(target);
                registerTarget(tie, target);
              }
          }
        else
          tie = r.tie;
        return tie;
      }
  }

  /**
   * Get the Stub class name for the name, representing the given interface.
   */
  private String getTieClassName(String interf)
  {
    String stubClassName;
    int p = interf.lastIndexOf('.');

    if (p < 0)
      // The interface is defined in the default package.
      stubClassName = "_" + interf + "_Tie";
    else
      stubClassName = interf.substring(0, p + 1) + "_"
        + interf.substring(p + 1) + "_Tie";
    return stubClassName;
  }

  /**
   * Register the Tie-target pair. As the Tie is a Servant, it can potentially
   * be connected to several objects and hence may be registered with several
   * targets.
   */
  public void registerTarget(Tie tie, Remote target)
  {
    synchronized (m_Ties)
      {
        synchronized (m_Targets)
          {
            TieTargetRecord r = (TieTargetRecord) m_Ties.get(tie);
            if (r == null)
              {
                // First registration for this Tie.
                r = new TieTargetRecord(tie);
                m_Ties.put(tie, r);
              }
            if (target != null)
              {
                r.add(target);
                m_Targets.put(target, r);
              }
          }
      }
  }

  /**
   * Deactivate the associated Tie, if it is found and is not connected to other
   * registered targets. Independing from the POA policies, the transparent
   * reactivation will not be possible.
   */
  public void unexportObject(Remote target)
    throws NoSuchObjectException
  {
    synchronized (m_Ties)
      {
        synchronized (m_Targets)
          {
            TieTargetRecord r = ((TieTargetRecord) m_Targets.get(target));
            if (r != null)
              {
                if (target instanceof org.omg.CORBA.Object)
                  r.tie.orb().disconnect((org.omg.CORBA.Object) target);

                if (r.unused())
                  {
                    m_Targets.remove(target);
                    m_Ties.remove(r.tie);
                    r.tie.deactivate();

                    if (r.tie.orb() instanceof ORB_1_4)
                      {
                        // Standard case, when more deep cleanup is possible.
                        // Independing from the POA policies, the object will
                        // not be activable transparently.
                        ORB_1_4 orb = (ORB_1_4) r.tie.orb();

                        if (target instanceof org.omg.CORBA.Object)
                          {
                            AOM.Obj record = orb.rootPOA.findObject((org.omg.CORBA.Object) target);

                            if (record != null && record.servant == r.tie
                              && record.poa instanceof gnuPOA)
                              {
                                ((gnuPOA) record.poa).aom.remove(record.key);
                                record.deactivated = true;
                                record.servant = null;
                              }
                          }
                      }
                  }
              }
          }
      }
  }

  /**
   * Checks if the given stub is local.
   * 
   * @param stub a stub to check.
   * @return true if the stub is local, false otherwise.
   */
  public boolean isLocal(Stub stub)
    throws RemoteException
  {
    try
      {
        return stub._is_local();
      }
    catch (SystemException e)
      {
        RemoteException rex = new RemoteException();
        rex.initCause(e);
        throw rex;
      }
  }

  /**
   * Load the class. The method uses class loaders from the call stact first. If
   * this fails, the further behaviour depends on the System Property
   * "java.rmi.server.useCodebaseOnly" with default value "false".
   * 
   * <ul>
   * <li>Try the current thread context class loader first.</li>
   * <li>If remoteCodebase is non-null and useCodebaseOnly is "false" then call
   * java.rmi.server.RMIClassLoader.loadClass (remoteCodebase, className)</li>
   * <li> If remoteCodebase is null or useCodebaseOnly is true then call
   * java.rmi.server.RMIClassLoader.loadClass(className)</li>
   * <li>If a class is still not successfully loaded and the loader != null
   * then try Class.forName(className, false, loader). </li>
   * </ul>
   * 
   * @param className the name of the class.
   * @param remoteCodebase the codebase.
   * @param loader the class loader.
   * @return the loaded class.
   * 
   * @throws ClassNotFoundException of the class cannot be loaded.
   */
  public Class loadClass(String className, String remoteCodebase,
    ClassLoader loader)
    throws ClassNotFoundException
  {
    if (loader == null)
      loader = Thread.currentThread().getContextClassLoader();