ChunkedStream.java — netty Source File

Source Code

/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package io.netty.handler.stream;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufAllocator;
import io.netty.channel.ChannelHandlerContext;
import io.netty.util.internal.ObjectUtil;

import java.io.InputStream;
import java.io.PushbackInputStream;

/**
 * A {@link ChunkedInput} that fetches data from an {@link InputStream} chunk by
 * chunk.
 * <p>
 * Please note that the {@link InputStream} instance that feeds data into
 * {@link ChunkedStream} must implement {@link InputStream#available()} as
 * accurately as possible, rather than using the default implementation.
 * Otherwise, {@link ChunkedStream} will generate many too small chunks or
 * block unnecessarily often.
 */
public class ChunkedStream implements ChunkedInput<ByteBuf> {

    static final int DEFAULT_CHUNK_SIZE = 8192;

    private final PushbackInputStream in;
    private final int chunkSize;
    private long offset;
    private boolean closed;

    /**
     * Creates a new instance that fetches data from the specified stream.
     */
    public ChunkedStream(InputStream in) {
        this(in, DEFAULT_CHUNK_SIZE);
    }

    /**
     * Creates a new instance that fetches data from the specified stream.
     *
     * @param chunkSize the number of bytes to fetch on each
     *                  {@link #readChunk(ChannelHandlerContext)} call
     */
    public ChunkedStream(InputStream in, int chunkSize) {
        ObjectUtil.checkNotNull(in, "in");
        ObjectUtil.checkPositive(chunkSize, "chunkSize");
// ... (89 more lines)