ChunkedNioStream Class — netty Architecture

Source Code

handler/src/main/java/io/netty/handler/stream/ChunkedNioStream.java lines 33–143

public class ChunkedNioStream implements ChunkedInput<ByteBuf> {

    private final ReadableByteChannel in;

    private final int chunkSize;
    private long offset;

    /**
     * Associated ByteBuffer
     */
    private final ByteBuffer byteBuffer;

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

    /**
     * Creates a new instance that fetches data from the specified channel.
     *
     * @param chunkSize the number of bytes to fetch on each
     *                  {@link #readChunk(ChannelHandlerContext)} call
     */
    public ChunkedNioStream(ReadableByteChannel in, int chunkSize) {
        this.in = checkNotNull(in, "in");
        this.chunkSize = checkPositive(chunkSize, "chunkSize");
        byteBuffer = ByteBuffer.allocate(chunkSize);
    }

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

    @Override
    public boolean isEndOfInput() throws Exception {
        if (byteBuffer.position() > 0) {
            // A previous read was not over, so there is a next chunk in the buffer at least
            return false;
        }
        if (in.isOpen()) {
            // Try to read a new part, and keep this part (no rewind)
            int b = in.read(byteBuffer);
            if (b < 0) {
                return true;
            } else {
                offset += b;
                return false;
            }
        }
        return true;
    }

    @Override
    public void close() throws Exception {
        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;
        }
        // buffer cannot be not be empty from there
        int readBytes = byteBuffer.position();
        for (;;) {
            int localReadBytes = in.read(byteBuffer);
            if (localReadBytes < 0) {
                break;
            }
            readBytes += localReadBytes;