ChunkedStream Class — netty Architecture

Source Code

handler/src/main/java/io/netty/handler/stream/ChunkedStream.java lines 36–148

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");

        if (in instanceof PushbackInputStream) {
            this.in = (PushbackInputStream) in;
        } else {
            this.in = new PushbackInputStream(in);
        }
        this.chunkSize = chunkSize;
    }

    /**
     * Returns the number of transferred bytes.
     */
    public long transferredBytes() {
        return offset;
    }

    @Override
    public boolean isEndOfInput() throws Exception {
        if (closed) {
            return true;
        }
        if (in.available() > 0) {
            return false;
        }

        int b = in.read();
        if (b < 0) {
            return true;
        } else {
            in.unread(b);
            return false;
        }
    }

    @Override
    public void close() throws Exception {
        closed = true;
        in.close();
    }

    @Deprecated
    @Override
    public ByteBuf readChunk(ChannelHandlerContext ctx) throws Exception {
        return readChunk(ctx.alloc());
    }

    @Override
    public ByteBuf readChunk(ByteBufAllocator allocator) throws Exception {
        if (isEndOfInput()) {
            return null;
        }

        final int availableBytes = in.available();
        final int chunkSize;
        if (availableBytes <= 0) {
            chunkSize = this.chunkSize;