    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
    015package org.apache.tapestry5.internal.services.assets;
    016
    017import java.io.ByteArrayInputStream;
    018import java.io.ByteArrayOutputStream;
    019import java.io.IOException;
    020import java.io.InputStream;
    021import 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 */
    030public 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}