// $Id: NetcdfRemoteProxyImpl.java,v 1.4 2002-05-29 18:31:35 steve Exp $
/*
 * Copyright 1997-2000 Unidata Program Center/University Corporation for
 * Atmospheric Research, P.O. Box 3000, Boulder, CO 80307,
 * support@unidata.ucar.edu.
 * 
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or (at
 * your option) any later version.
 * 
 * This library 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 Lesser
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 
 */
package ucar.netcdf;
import ucar.multiarray.RemoteAccessor;
import java.rmi.Remote;
import java.rmi.RemoteException;
import java.rmi.server.RemoteObject;
import java.rmi.server.UnicastRemoteObject;
import java.rmi.server.Unreferenced;

/**
 * This class provides implementation of the interface
 * NetcdfRemoteProxy. It wraps a single instance of Netcdf
 * provide Remote services required in the construction
 * of an instance of RemoteNetcdf.
 *
 * @see NetcdfRemoteProxy
 * @author $Author: steve $
 * @version $Revision: 1.4 $ $Date: 2002-05-29 18:31:35 $
 */

public class
NetcdfRemoteProxyImpl
		extends RemoteObject
		implements NetcdfRemoteProxy, Unreferenced {

        /**
         * Construct a RemoteObject which acts as
	 * a NetcdfRemoteProxy for a single Netcdf.
	 * @param svr NetcdfServer which owns this.
	 * @param key String by which svr knows us.
	 * @param nc Netcdf  which this will represent.
	 *
	 */
	public
	NetcdfRemoteProxyImpl(NetcdfServer svr, String key, AbstractNetcdf nc)
		throws RemoteException
	{
		super();
		svr_ = svr;
		key_ = key;
		nc_ = nc;
	}

/* Begin NetcdfRemoteProxy */	

	public Schema
	getSchema()
		throws RemoteException
	{
		return nc_.getSchema();
	}

	public RemoteAccessor
	getAccessor(String varName)
		throws RemoteException
	{
		if(svr_ != null)
			return (RemoteAccessor) svr_.exportObject(
				new RemoteAccessorImpl(this, nc_.get(varName)));
		// else
		return (RemoteAccessor) UnicastRemoteObject.exportObject(
				new RemoteAccessorImpl(this, nc_.get(varName)));
	}

	public void
	release()
		throws RemoteException
	{
		_release();
	}

/* End NetcdfRemoteProxy */	
/* Begin java.rmi.server.Unreferenced */	

	/**
	 * Equivalent to release(), called automatically by
	 * the runtime system.
	 * @see java.rmi.server.Unreferenced#unreferenced
	 * @see NetcdfRemoteProxy#release
	 */
	public void
	unreferenced()
	{
		if(svr_ != null && svr_.logger_ != null)
			svr_.logger_.logDebug(this + ".unreferenced()");
		_release();
	}
/* End java.rmi.server.Unreferenced */	

	protected void
	finalize()
		throws Throwable
	{ 
		if(svr_ != null && svr_.logger_ != null)
			svr_.logger_.logDebug(this + ".finalize()");
		super.finalize();
		_release();
	}

	protected void
	_release()
	{
		if(nc_ != null)
		{
			svr_._release(key_);
			nc_ = null;
		}
	}

	/**
	 * @serial
	 */
	private final NetcdfServer svr_;
	/**
	 * @serial
	 */
	private final String key_;
	/**
	 * @serial
	 */
	private /* final */ AbstractNetcdf nc_;
}