    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    }