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authorupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
committerupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
commit554fd8c5195424bdbcabf5de30fdc183aba391bd (patch)
tree976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/javax/rmi/CORBA/Stub.java
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+/* Stub.java --
+ Copyright (C) 2004, 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 javax.rmi.CORBA;
+
+import gnu.javax.rmi.CORBA.DelegateFactory;
+import gnu.javax.rmi.CORBA.StubDelegateImpl;
+
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.io.Serializable;
+import java.rmi.RemoteException;
+
+import javax.rmi.PortableRemoteObject;
+
+import org.omg.CORBA.ORB;
+import org.omg.CORBA_2_3.portable.ObjectImpl;
+
+/**
+ * A Stub descendants provide access to the object on the client side. This base
+ * class implements methods, required for remote or local invocation using CORBA
+ * mechanisms. The most of the functionality is forwarded to the stub delegate.
+ * This delegate can be altered by setting the system property
+ * "javax.rmi.CORBA.StubClass" to the name of the alternative class that must
+ * implement {@link StubDelegate}. Hence Stub contains two delegates, one for
+ * Stub-related operations and another inherited from the ObjectImpl.
+ *
+ * @specnote GNU Classpath uses separate delegate per each Stub. The delegate
+ * holds information about the ORB and other data, specific for the each Stub.
+ *
+ * @author Audrius Meskauskas (AudriusA@Bioinformatics.org)
+ */
+public abstract class Stub
+ extends ObjectImpl
+ implements Serializable
+{
+ /**
+ * For compatability with Sun's JDK 1.4.2 rev. 5
+ */
+ private static final long serialVersionUID = 1087775603798577179L;
+
+ /**
+ * The hashcode, computed once (expensive operation).
+ */
+ transient int m_hash = Integer.MIN_VALUE;
+
+ /**
+ * The stringified reference, computed once (expensive operation).
+ */
+ transient String m_ior;
+
+ /**
+ * The ORB, where the stub is connected on the client side.
+ */
+ transient ORB m_orb;
+
+ /**
+ * The associated delegate, responsible for the major of the functionality of
+ * this stub.
+ */
+ static StubDelegate delegate = (StubDelegate) DelegateFactory.getInstance(DelegateFactory.STUB);
+
+ /**
+ * Returns the same hashcode for all stubs that point to the same remote
+ * object.
+ */
+ public int hashCode()
+ {
+ if (m_hash == Integer.MIN_VALUE)
+ m_hash = delegate.hashCode(this);
+ // This should finally result to the IOR comparison.
+ return m_hash;
+ }
+
+ /**
+ * The stubs are equal if they point to the same remote object.
+ */
+ public boolean equals(java.lang.Object obj)
+ {
+ return delegate.equals(this, obj);
+ }
+
+ /**
+ * Get the string representation of this Stub.
+ *
+ * @return the CORBA IOR reference.
+ */
+ public String toString()
+ {
+ if (m_ior == null)
+ m_ior = delegate.toString(this);
+ return m_ior;
+ }
+
+ /**
+ * <p>
+ * Finds the suitable {@link Tie} for this Stub and connects it to the given
+ * ORB. The tie is found by the name pattern. If the found tie is derived from
+ * {@link org.omg.CORBA.PortableServer.Servant}, it is connected to the root
+ * POA, also activating it (if not already active).
+ * </p>
+ * <p>
+ * This method does not allow to specify, to which POA the found Tie must be
+ * connected and requires to use the deprecated method {@link ORB#connect}.
+ * Many useful POA features remain unaccessible. A better alternative it might
+ * be to generate a {@link org.omg.CORBA.PortableServer.Servant} - derived Tie
+ * (-poa key in rmic) and connect it to POA in one of the many ways, listed in
+ * the description of the {@link orb.omg.PortableServer} package). The
+ * obtained CORBA object can be narrowed into stub using
+ * {@link PortableRemoteObject#narrow}.
+ * </p>
+ * <p>
+ * It is frequently easier to call {@link PortableRemoteObject#connect} rather
+ * than this method.
+ * </p>
+ *
+ * @param orb the ORB where the Stub must be connected.
+ *
+ * @throws RemoteException if the stub is already connected to some other ORB.
+ * If the stub is already connected to the ORB that was passed as parameter,
+ * the method returns without action.
+ *
+ * @throws BAD_PARAM if the name of this stub does not match the stub name
+ * pattern, "_*_Stub" or if the Tie class, "_*Impl_Tie", does not exists or an
+ * instance of this class cannot be instantiated.
+ */
+ public void connect(ORB orb)
+ throws RemoteException
+ {
+ if (m_orb != null && orb != null)
+ {
+ if (m_orb.equals(orb))
+ throw new RemoteException("Stub " + this
+ + " is connected to another ORB, " + orb);
+ else
+ return;
+ }
+ m_orb = orb;
+ delegate.connect(this, orb);
+ }
+
+ /**
+ * Required by serialized form of Java API doc.
+ */
+ private void readObject(ObjectInputStream input)
+ throws IOException, ClassNotFoundException
+ {
+ if (delegate instanceof StubDelegateImpl)
+ ((StubDelegateImpl) delegate).readObject(this, input, m_orb);
+ else
+ delegate.readObject(this, input);
+ }
+
+ /**
+ * Required by serialized form of Java API doc.
+ */
+ private void writeObject(ObjectOutputStream output)
+ throws IOException
+ {
+ // The m_orb in this case may be either known or not.
+ if (delegate instanceof StubDelegateImpl)
+ ((StubDelegateImpl) delegate).writeObject(this, output, m_orb);
+ else
+
+ delegate.writeObject(this, output);
+ }
+}