001    // Copyright 2010 The Apache Software Foundation
002    //
003    // Licensed under the Apache License, Version 2.0 (the "License");
004    // you may not use this file except in compliance with the License.
005    // You may obtain a copy of the License at
006    //
007    // http://www.apache.org/licenses/LICENSE-2.0
008    //
009    // Unless required by applicable law or agreed to in writing, software
010    // distributed under the License is distributed on an "AS IS" BASIS,
011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012    // See the License for the specific language governing permissions and
013    // limitations under the License.
014    
015    package org.apache.tapestry5.internal.services.assets;
016    
017    import java.io.ByteArrayInputStream;
018    import java.io.ByteArrayOutputStream;
019    import java.io.IOException;
020    import java.io.InputStream;
021    import java.io.OutputStream;
022    
023    /**
024     * A wrapper around a byte-stream, represented internally as a byte array. Part of the fix
025     * to TAP5-1116, avoiding a live lock due to ByteArrayOutputStream.writeTo() being a synchronized
026     * method.
027     * 
028     * @since 5.2.0
029     */
030    public class BytestreamCache
031    {
032        private final byte[] streamData;
033    
034        public BytestreamCache(byte[] streamData)
035        {
036            this.streamData = streamData;
037        }
038    
039        public BytestreamCache(ByteArrayOutputStream os)
040        {
041            this(os.toByteArray());
042        }
043    
044        public void writeTo(OutputStream os) throws IOException
045        {
046            os.write(streamData, 0, streamData.length);
047        }
048    
049        public int size()
050        {
051            return streamData.length;
052        }
053    
054        public InputStream openStream()
055        {
056            return new ByteArrayInputStream(streamData);
057        }
058    }