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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/javax/rmi/CORBA/Stub.java | |
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Diffstat (limited to 'libjava/classpath/javax/rmi/CORBA/Stub.java')
-rw-r--r-- | libjava/classpath/javax/rmi/CORBA/Stub.java | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/libjava/classpath/javax/rmi/CORBA/Stub.java b/libjava/classpath/javax/rmi/CORBA/Stub.java new file mode 100644 index 000000000..d9b45f77b --- /dev/null +++ b/libjava/classpath/javax/rmi/CORBA/Stub.java @@ -0,0 +1,203 @@ +/* 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); + } +} |