head	1.7;
access;
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	TIGRIS_0_9_2_4:1.2
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	HELM_PEER_PORT_BRANCH:1.4.0.2
	TURBINE_PEER:1.4
	TIGRIS_0_9_2_1:1.4
	TIGRIS_0_9_2:1.2.0.2;
locks; strict;
comment	@# @;


1.7
date	2001.04.18.22.39.19;	author dlr;	state dead;
branches;
next	1.6;

1.6
date	2001.03.26.19.10.15;	author dlr;	state Exp;
branches;
next	1.5;

1.5
date	2001.03.13.03.35.27;	author dlr;	state Exp;
branches;
next	1.4;

1.4
date	2001.01.26.18.29.09;	author edk;	state Exp;
branches
	1.4.2.1;
next	1.3;

1.3
date	2001.01.26.05.24.08;	author edk;	state dead;
branches;
next	1.2;

1.2
date	2000.12.23.00.48.19;	author dlr;	state Exp;
branches;
next	1.1;

1.1
date	2000.12.21.23.40.58;	author dlr;	state Exp;
branches;
next	;

1.4.2.1
date	2001.01.28.01.02.19;	author dlr;	state dead;
branches;
next	;


desc
@@


1.7
log
@SequencedHashtable, BufferCache, and BaseUnicastRemoteService have been moved into Turbine.  Changed references accordingly.
@
text
@/* ================================================================
 * Copyright (c) 2000 CollabNet.  All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 * 
 * 1. Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * 
 * 2. Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * 
 * 3. The end-user documentation included with the redistribution, if
 * any, must include the following acknowlegement: "This product includes
 * software developed by CollabNet (http://www.collab.net/)."
 * Alternately, this acknowlegement may appear in the software itself, if
 * and wherever such third-party acknowlegements normally appear.
 * 
 * 4. The hosted project names must not be used to endorse or promote
 * products derived from this software without prior written
 * permission. For written permission, please contact info@@collab.net.
 * 
 * 5. Products derived from this software may not use the "Tigris" name
 * nor may "Tigris" appear in their names without prior written
 * permission of CollabNet.
 * 
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL COLLAB.NET OR ITS CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * ====================================================================
 * 
 * This software consists of voluntary contributions made by many
 * individuals on behalf of CollabNet.
 */

package org.tigris.helm.tool;

import java.util.*;

/**
 * A fixed length object cache.  Used to buffer the most recently used
 * business objects.
 *
 * @@author <a href="mailto:dlr@@collab.net">Daniel Rall</a>
 * @@version $Id: BufferCache.java,v 1.6 2001/03/26 19:10:15 dlr Exp $
 */
public class BufferCache extends SequencedHashtable
{
    /**
     * The default maximum size of the cache.
     */
    private static final int DEFAULT_MAX_SIZE = 35;

    /**
     * The size of the cache.  The newest elements in the sequence are kept
     * toward the end.
     */
    private int maxSize;

    /**
     * Creates a new instance with default storage buffer.
     */
    public BufferCache ()
    {
        this(DEFAULT_MAX_SIZE);
    }

    /**
     * Creates a new instance with the specified storage buffer.
     *
     * @@param maxSize The maximum size of the cache.
     */
    public BufferCache (int maxSize)
    {
        super(maxSize);
        this.maxSize = maxSize;
    }

    /**
     * Stores the provided key/value pair, freshening its list index if the
     * specified key already exists.
     *
     * @@param key   The key to the provided value.
     * @@param value The value to store.
     * @@return      The previous value for the specified key, or
     *              <code>null</code> if none.
     */
    public synchronized Object put (Object key, Object value)
    {
        int size = size();
        if (size > 0 && size + 1 >= maxSize)
        {
            // Stay within constraints of allocated buffer by releasing the
            // eldest buffered object.
            remove(0);
        }
        return super.put(key, value);
    }
}
@


1.6
log
@Don't attempt to freshen an empty cache.
@
text
@d56 1
a56 1
 * @@version $Id: BufferCache.java,v 1.5 2001/03/13 03:35:27 dlr Exp $
@


1.5
log
@Increased DEFAULT_MAX_SIZE from 25 to 35.
@
text
@d56 1
a56 1
 * @@version $Id: BufferCache.java,v 1.4 2001/01/26 18:29:09 edk Exp $
d101 2
a102 1
        if (size() + 1 >= maxSize)
@


1.4
log
@readding all the files as part of the process of returning to the way
things were as of tuesday
@
text
@d56 1
a56 1
 * @@version $Id: BufferCache.java,v 1.2 2000/12/23 00:48:19 dlr Exp $
d63 1
a63 1
    private static final int DEFAULT_MAX_SIZE = 25;
@


1.4.2.1
log
@Porting to the Turbine Peer system.  -dlr and leonardr
@
text
@d56 1
a56 1
 * @@version $Id: BufferCache.java,v 1.4 2001/01/26 18:29:09 edk Exp $
@


1.3
log
@revert this stuff to its state as of 2001/01/24 12:42:00 GMT -- with
the following exceptions, which have some different modifications so
they'll work with changes which have happened in joist:

ProjectNewsEdit.java
SkinManager.java
SkinStyleElementValueManager.java
StyleElementManager.java
StyleManager.java

it compiles.  i dunno if it works, though.
@
text
@@


1.2
log
@Removed unnecessary getCache() implementations in BusinessObject subclasses and migrated to a factory method for User's primary database key ctor.
@
text
@d56 1
a56 1
 * @@version $Id: BufferCache.java,v 1.1 2000/12/21 23:40:58 dlr Exp $
@


1.1
log
@A fixed length object cache.  Used to buffer the most recently used
business objects.
@
text
@d56 1
a56 1
 * @@version $Id: $
d63 1
a63 1
    private static final int DEFAULT_MAX_SIZE = 20;
@

