001    /*
002     *  Licensed to the Apache Software Foundation (ASF) under one
003     *  or more contributor license agreements.  See the NOTICE file
004     *  distributed with this work for additional information
005     *  regarding copyright ownership.  The ASF licenses this file
006     *  to you under the Apache License, Version 2.0 (the
007     *  "License"); you may not use this file except in compliance
008     *  with the License.  You may obtain a copy of the License at
009     *  
010     *    http://www.apache.org/licenses/LICENSE-2.0
011     *  
012     *  Unless required by applicable law or agreed to in writing,
013     *  software distributed under the License is distributed on an
014     *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015     *  KIND, either express or implied.  See the License for the
016     *  specific language governing permissions and limitations
017     *  under the License. 
018     *  
019     */
020    package org.apache.directory.shared.ldap.util;
021    
022    
023    import java.io.PipedInputStream;
024    import java.io.IOException;
025    
026    
027    /**
028     * A piped input stream that fixes the "Read end Dead" issue when a single
029     * thread is used.
030     * 
031     * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
032     * @version $Rev: 437007 $
033     */
034    public class ParserPipedInputStream extends PipedInputStream
035    {
036        protected synchronized void receive( int b ) throws IOException
037        {
038            while ( in == out )
039            {
040                /* full: kick any waiting readers */
041                notifyAll();
042                try
043                {
044                    wait( 1000 );
045                }
046                catch ( InterruptedException ex )
047                {
048                    throw new java.io.InterruptedIOException();
049                }
050            }
051    
052            if ( in < 0 )
053            {
054                in = 0;
055                out = 0;
056            }
057    
058            buffer[in++] = ( byte ) ( b & 0xFF );
059    
060            if ( in >= buffer.length )
061            {
062                in = 0;
063            }
064        }
065    }