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JCIFS is an Open Source client library that implements the CIFS/SMB networking protocol in 100% Java

There is a newer version: 1.3.18.1

/* jcifs smb client library in Java
 * Copyright (C) 2000  "Michael B. Allen" 
 * 
 * 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 jcifs.smb;

import jcifs.Config;

public class BufferCache {

    private static final int MAX_BUFFERS = Config.getInt( "jcifs.smb.maxBuffers", 16 );

    static Object[] cache = new Object[MAX_BUFFERS];
    private static int freeBuffers = 0;

    static public byte[] getBuffer() {
        synchronized( cache ) {
            byte[] buf;

            if (freeBuffers > 0) {
                for (int i = 0; i < MAX_BUFFERS; i++) {
                    if( cache[i] != null ) {
                        buf = (byte[])cache[i];
                        cache[i] = null;
                        freeBuffers--;
                        return buf;
                    }
                }
            }

            buf = new byte[SmbComTransaction.TRANSACTION_BUF_SIZE];

            return buf;
        }
    }
    static void getBuffers( SmbComTransaction req, SmbComTransactionResponse rsp ) {
        synchronized( cache ) {
            req.txn_buf = getBuffer();
            rsp.txn_buf = getBuffer();
        }
    }
    static public void releaseBuffer( byte[] buf ) {
        synchronized( cache ) {
            if (freeBuffers < MAX_BUFFERS) {
                for (int i = 0; i < MAX_BUFFERS; i++) {
                    if (cache[i] == null) {
                        cache[i] = buf;
                        freeBuffers++;
                        return;
                    }
                }
            }
        }
    }
}