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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/gnu/javax/naming/jndi/url/rmi/RmiContinuation.java
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+/* RmiContinuation.java -- RMI naming context
+ Copyright (C) 2006 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.naming.jndi.url.rmi;
+
+import java.rmi.AccessException;
+import java.rmi.AlreadyBoundException;
+import java.rmi.NotBoundException;
+import java.rmi.Remote;
+import java.rmi.RemoteException;
+import java.rmi.registry.LocateRegistry;
+import java.rmi.registry.Registry;
+import java.util.Hashtable;
+import java.util.Map;
+import java.util.Properties;
+
+import javax.naming.CommunicationException;
+import javax.naming.Context;
+import javax.naming.InvalidNameException;
+import javax.naming.Name;
+import javax.naming.NameAlreadyBoundException;
+import javax.naming.NameNotFoundException;
+import javax.naming.NameParser;
+import javax.naming.NamingEnumeration;
+import javax.naming.NamingException;
+import javax.naming.OperationNotSupportedException;
+
+/**
+ * The implementation of the RMI URL context. This context connects
+ *
+ * @author Audrius Meskauskas
+ */
+public class RmiContinuation implements Context
+{
+ /**
+ * The default registry location.
+ */
+ public static final String DEFAULT_REGISTRY_LOCATION = "rmi://localhost:1099";
+
+ /**
+ * The local or remote RMI registry, performing the actual work for this
+ * context.
+ */
+ Registry registry;
+
+ /**
+ * The properties.
+ */
+ Properties properties;
+
+ /**
+ * The flag, indicating, that the lookup methods were called before.
+ * If the lookup methods were called before, the existing ORB cannot be
+ * destroyed, as references to the existing objects will become
+ * unfunctional.
+ */
+ boolean lookupCalled;
+
+ /**
+ * Add new environment property to the environment of this context. Both name
+ * and value of the new property must not be null. If the property is already
+ * defined, is current value is replaced by the propVal. This method replaces
+ * the registry. The new registry will be lazily instantiated on the first
+ * call.
+ *
+ * @param key
+ * the name of the new property
+ * @param value
+ * the value of the new property
+ * @return the previous value of this property or null if the property has not
+ * been previously defined
+ */
+ public Object addToEnvironment(String key, Object value)
+ {
+ removeRegistry();
+ if (key == null || value == null)
+ throw new NullPointerException();
+ return properties.put(key, value);
+ }
+
+ /**
+ * Returns the environment, associated with this naming context. The returned
+ * table should never be modified by the caller (the registry would not be updated
+ * in such case). Use {@link #addToEnvironment} and
+ * {@link #removeFromEnvironment} to modify the environement, if needed.
+ *
+ * @return the table, representing the environment of this context
+ * @throws NamingException
+ */
+ public Hashtable getEnvironment() throws NamingException
+ {
+ return properties;
+ }
+
+ /**
+ * Removes the property with the given name from the environment. Returns
+ * without action if this property is not defined. Replaces the ORB,
+ * constructing the new ORB with the changes set of properties (you can
+ * replace the CORBA implementation provider, for instance). The new ORB will
+ * be lazily instantiated on the first call.
+ *
+ * @param propName
+ * the name of the property being removed.
+ * @return the value of the property that has been removed or null if the
+ * property was not defined.
+ * @throws NamingException
+ */
+ public Object removeFromEnvironment(String propName) throws NamingException
+ {
+ removeRegistry();
+ return properties.remove(propName);
+ }
+
+ /**
+ * Remove the current registry reference.
+ */
+ public void removeRegistry()
+ {
+ registry = null;
+ }
+
+ /**
+ * Get the cached or new registry reference.
+ *
+ * @return the registry reference, either cached or new.
+ */
+ public Registry getRegistry() throws NamingException
+ {
+ if (registry == null)
+ {
+ String address = properties.getProperty(Context.PROVIDER_URL,
+ DEFAULT_REGISTRY_LOCATION);
+
+ // The format like rmi://localhost:1099 is expected. Parse.
+ if (!address.startsWith("rmi://"))
+ throw new InvalidNameException(address);
+
+ String a = address.substring("rmi://".length());
+
+ // The colon, if present, indicates the start of the port number.
+ int colon = a.lastIndexOf(':');
+ int port;
+
+ try
+ {
+ if (colon >=0)
+ {
+ port = Integer.parseInt(a.substring(colon+1));
+ a = a.substring(0, colon);
+ }
+ else
+ port = Registry.REGISTRY_PORT;
+ }
+ catch (NumberFormatException e1)
+ {
+ throw new InvalidNameException(address);
+ }
+
+ try
+ {
+ registry = LocateRegistry.getRegistry(a, port);
+ }
+ catch (RemoteException e)
+ {
+ throw new CommunicationException(e.toString());
+ }
+ }
+ return registry;
+ }
+
+ /**
+ * Create the rmi url context that works, talking with the given RMI registry.
+ *
+ * @param props
+ * the properties for this context
+ */
+ public RmiContinuation(Map props)
+ {
+ properties = new Properties();
+ if (props != null)
+ properties.putAll(props);
+ }
+
+ /**
+ * Bind the given name into this context. The .toString() is called to
+ * convert into the string representation, required by RMI registry.
+ *
+ * @throws NamingException if the object is not an instance of Remote
+ */
+ public void bind(Name name, Object obj) throws NamingException
+ {
+ bind(name.toString(), obj);
+ }
+
+ /**
+ * Bind the given name into this context.
+ */
+ public void bind(String name, Object obj) throws NamingException
+ {
+ try
+ {
+ getRegistry().bind(name, (Remote) obj);
+ }
+ catch (AccessException e)
+ {
+ throw new NamingException("access:"+e.toString());
+ }
+ catch (RemoteException e)
+ {
+ throw new CommunicationException(e.toString());
+ }
+ catch (AlreadyBoundException e)
+ {
+ throw new NameAlreadyBoundException(name);
+ }
+ catch (ClassCastException c)
+ {
+ throw new NamingException("Only Remote can be bound:"
+ + obj.getClass().getName());
+ }
+ }
+
+ /**
+ * Not supported.
+ */
+ public Name composeName(Name name, Name prefix) throws NamingException
+ {
+ throw new OperationNotSupportedException();
+ }
+
+ /**
+ * Not supported.
+ */
+ public String composeName(String name, String prefix) throws NamingException
+ {
+ throw new OperationNotSupportedException();
+ }
+
+ /**
+ * Subcontexts are not supporte by RMI registry. The only supported case is an
+ * empty name (returns the cloned instance of self).
+ */
+ public Context createSubcontext(Name name) throws NamingException
+ {
+ if (name.size() == 0)
+ return new RmiContinuation(properties);
+ else
+ throw new OperationNotSupportedException();
+ }
+
+ /**
+ * Subcontexts are not supporte by RMI registry. The only supported case is an
+ * empty name (returns the cloned instance of self).
+ */
+ public Context createSubcontext(String name) throws NamingException
+ {
+ if (name.length() == 0)
+ return new RmiContinuation(properties);
+ else
+ throw new OperationNotSupportedException();
+ }
+
+ /**
+ * Subcontexts are not supporte by RMI registry.
+ */
+ public void destroySubcontext(Name name) throws NamingException
+ {
+ throw new OperationNotSupportedException();
+ }
+
+ /**
+ * Subcontexts are not supporte by RMI registry.
+ */
+ public void destroySubcontext(String name) throws NamingException
+ {
+ throw new OperationNotSupportedException();
+ }
+
+ /**
+ * Returns the naming service URL, same that was passed vie
+ * {@link Context#PROVIDER_URL}.
+ */
+ public String getNameInNamespace() throws NamingException
+ {
+ return properties.getProperty(Context.PROVIDER_URL,
+ DEFAULT_REGISTRY_LOCATION);
+ }
+
+ /**
+ * Not supported, this context never parses any names.
+ */
+ public NameParser getNameParser(Name name) throws NamingException
+ {
+ throw new OperationNotSupportedException();
+ }
+
+ /**
+ * Not supported, this context never parses any names.
+ */
+ public NameParser getNameParser(String name) throws NamingException
+ {
+ throw new OperationNotSupportedException();
+ }
+
+ /**
+ * List existing bindings of this context (the parameter must be empty name,
+ * indicating the root context). The class name of the returned name class
+ * pairs is "Remote", as this "quick preview" method should probably not call
+ * the naming service again. Use listBindings if more details are required.
+ */
+ public NamingEnumeration list(Name name) throws NamingException
+ {
+ if (name.size() > 0)
+ throw new OperationNotSupportedException("Only empty name is accepted");
+ return list("");
+ }
+
+ /**
+ * List existing bindings of this context (the parameter must be empty string,
+ * indicating the root context). The class name of the returned name class
+ * pairs is "Remote", as this "quick preview" method should probably not call
+ * the naming service again. Use listBindings if more details are required.
+ */
+ public NamingEnumeration list(String name) throws NamingException
+ {
+ if (name.length() > 0)
+ throw new OperationNotSupportedException("Only empty name is accepted");
+
+ try
+ {
+ return new ListEnumeration(getRegistry().list());
+ }
+ catch (Exception e)
+ {
+ throw new NamingException(e.toString());
+ }
+ }
+
+ /**
+ * List existing bindings of this context (the parameter must be empty name,
+ * indicating the root context).
+ */
+ public NamingEnumeration listBindings(Name name) throws NamingException
+ {
+ if (name.size() > 0)
+ throw new OperationNotSupportedException("Only empty name is accepted");
+ return listBindings("");
+ }
+
+ /**
+ * List existing bindings of this context (the parameter must be empty name,
+ * indicating the root context).
+ */
+ public NamingEnumeration listBindings(String name) throws NamingException
+ {
+ if (name.length() > 0)
+ throw new OperationNotSupportedException("Only empty name is accepted");
+
+ try
+ {
+ Registry r = getRegistry();
+ return new ListBindingsEnumeration(r.list(), r);
+ }
+ catch (Exception e)
+ {
+ throw new NamingException(e.toString());
+ }
+ }
+
+ /**
+ * Not supported.
+ */
+ public Object lookupLink(Name name) throws NamingException
+ {
+ throw new OperationNotSupportedException();
+ }
+
+ /**
+ * Not supported.
+ */
+ public Object lookupLink(String name) throws NamingException
+ {
+ throw new OperationNotSupportedException();
+ }
+
+ /**
+ * Rebinds this object.
+ *
+ * @param name
+ * the object name (.toString()) is used to convert into string
+ * representation.
+ * @param obj
+ * object (must be an instance of Remote).
+ */
+ public void rebind(Name name, Object obj) throws NamingException
+ {
+ rebind(name.toString(), obj);
+ }
+
+ /**
+ * Rebinds this object.
+ *
+ * @param name
+ * the object name.
+ * @param obj
+ * object (must be an instance of Remote).
+ */
+ public void rebind(String name, Object obj) throws NamingException
+ {
+ try
+ {
+ getRegistry().rebind(name, (Remote) obj);
+ }
+ catch (AccessException e)
+ {
+ throw new NamingException("access:"+e.toString());
+ }
+ catch (RemoteException e)
+ {
+ throw new CommunicationException(e.toString());
+ }
+ catch (ClassCastException c)
+ {
+ throw new NamingException("Only Remote can be bound:"
+ + obj.getClass().getName());
+ }
+ }
+
+ /**
+ * Renames the object. If the new name is already bound in the given context,
+ * the {@link AlreadyBoundException} is thrown and the oldName binding is
+ * preserved.
+ */
+ public void rename(Name oldName, Name newName) throws NamingException
+ {
+ rename(oldName.toString(), newName.toString());
+ }
+
+ /**
+ * Renames the object. If the new name is already bound in the given context,
+ * the {@link AlreadyBoundException} is thrown and the oldName binding is
+ * preserved.
+ */
+ public synchronized void rename(String oldName, String newName)
+ throws NamingException
+ {
+ try
+ {
+ Registry r = getRegistry();
+ Remote object = r.lookup(oldName);
+ r.unbind(oldName);
+ try
+ {
+ r.bind(newName, object);
+ }
+ catch (AlreadyBoundException e)
+ {
+ // Bind it back.
+ try
+ {
+ r.bind(oldName, object);
+ }
+ catch (AlreadyBoundException e1)
+ {
+ // We have just removed this name.
+ throw new InternalError();
+ }
+ throw new NameAlreadyBoundException(newName);
+ }
+ }
+ catch (AccessException e)
+ {
+ throw new NamingException(e.toString());
+ }
+ catch (RemoteException e)
+ {
+ throw new CommunicationException(e.toString());
+ }
+ catch (NotBoundException e)
+ {
+ throw new CommunicationException(e.toString());
+ }
+ }
+
+ /**
+ * Unbind the object.
+ */
+ public void unbind(Name name) throws NamingException
+ {
+ unbind(name.toString());
+ }
+
+ /**
+ * Unbind the object.
+ */
+ public void unbind(String name) throws NamingException
+ {
+ try
+ {
+ getRegistry().unbind(name);
+ }
+ catch (AccessException e)
+ {
+ throw new NamingException(e.toString());
+ }
+ catch (RemoteException e)
+ {
+ throw new CommunicationException(e.toString());
+ }
+ catch (NotBoundException e)
+ {
+ throw new CommunicationException(e.toString());
+ }
+ }
+
+ /**
+ * Release the associated resources.
+ */
+ public void close() throws NamingException
+ {
+ removeRegistry();
+ }
+
+ /**
+ * Resolve the object by name.
+ *
+ * @param name
+ * the object name, .toString() is used to get the string
+ * representation.
+ */
+ public Object lookup(Name name) throws NamingException
+ {
+ return lookup(name.toString());
+ }
+
+ /**
+ * Resolve the object by name
+ *
+ * @param name the object name.
+ */
+ public Object lookup(String name) throws NamingException
+ {
+ try
+ {
+ return getRegistry().lookup(name);
+ }
+ catch (AccessException e)
+ {
+ throw new NamingException(e.toString());
+ }
+ catch (RemoteException e)
+ {
+ throw new CommunicationException(e.toString());
+ }
+ catch (NotBoundException e)
+ {
+ throw new NameNotFoundException(name);
+ }
+ }
+}