/* jcifs smb client library in Java
* Copyright (C) 2000 "Michael B. Allen" <jcifs at samba dot org>
*
* 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 com.knowgate.jcifs.smb;
import com.knowgate.jcifs.Config;
class BufferCache {
private static final int MAX_BUFFERS = Config.getInt( "jcifs.smb.maxBuffers", 16 );
private static Object[] cache = new Object[MAX_BUFFERS];
private static int numBuffers = 0;
private static int freeBuffers = 0;
static byte[] getBuffer() {
byte[] buf;
synchronized( cache ) {
while( freeBuffers == 0 && numBuffers == MAX_BUFFERS ) {
try {
cache.wait();
} catch( InterruptedException ie ) {
return null;
}
}
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];
numBuffers++;
}
return buf;
}
static void releaseBuffer( byte[] buf ) {
synchronized( cache ) {
for( int i = 0; i < MAX_BUFFERS; i++ ) {
if( cache[i] == null ) {
cache[i] = buf;
freeBuffers++;
cache.notify();
return;
}
}
}
}
}