org.glassfish.grizzly.spdy.frames.WindowUpdateFrame Maven / Gradle / Ivy

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package org.glassfish.grizzly.spdy.frames;

import org.glassfish.grizzly.Buffer;
import org.glassfish.grizzly.ThreadCache;
import org.glassfish.grizzly.memory.MemoryManager;

import static org.glassfish.grizzly.spdy.Constants.SPDY_VERSION;

public class WindowUpdateFrame extends SpdyFrame {

    private static final ThreadCache.CachedTypeIndex CACHE_IDX =
                       ThreadCache.obtainIndex(WindowUpdateFrame.class, 8);

    public static final int TYPE = 9;

    private int streamId;
    private int delta;

    // ------------------------------------------------------------ Constructors


    private WindowUpdateFrame() { }


    // ---------------------------------------------------------- Public Methods


    static WindowUpdateFrame create() {
        WindowUpdateFrame frame = ThreadCache.takeFromCache(CACHE_IDX);
        if (frame == null) {
            frame = new WindowUpdateFrame();
        }
        return frame;
    }

    static WindowUpdateFrame create(final SpdyHeader header) {
        WindowUpdateFrame frame = create();
        frame.initialize(header);
        return frame;
    }

    public static WindowUpdateFrameBuilder builder() {
        return new WindowUpdateFrameBuilder();
    }

    public int getStreamId() {
        return streamId;
    }

    public int getDelta() {
        return delta;
    }

    @Override
    public boolean isFlagSet(byte flag) {
        return false;
    }

    @Override
    public void setFlag(byte flag) {
        // no-op
    }

    @Override
    public void clearFlag(byte flag) {
        // no-op
    }

    @Override
    public String toString() {
        final StringBuilder sb = new StringBuilder();
        sb.append("WindowUpdateFrame");
        sb.append("{streamId=").append(streamId);
        sb.append(", delta=").append(delta);
        sb.append('}');
        return sb.toString();
    }

    // -------------------------------------------------- Methods from Cacheable


    @Override
    public void recycle() {
        streamId = 0;
        delta = 0;
        super.recycle();
        ThreadCache.putToCache(CACHE_IDX, this);
    }


    // -------------------------------------------------- Methods from SpdyFrame


    @Override
    public Buffer toBuffer(MemoryManager memoryManager) {
        final Buffer buffer = memoryManager.allocate(16);

        buffer.putInt(0, 0x80000000 | (SPDY_VERSION << 16) | TYPE);  // C | SPDY_VERSION | WINDOW_UPDATE_FRAME
        buffer.putInt(4, 8); // FLAGS | LENGTH
        buffer.putInt(8, streamId & 0x7FFFFFFF); // X | STREAM_ID
        buffer.putInt(12, delta & 0x7FFFFFFF);  // X | delta

        return buffer;
    }


    // ------------------------------------------------------- Protected Methods

    @Override
    protected void initialize(SpdyHeader header) {
        super.initialize(header);
        streamId = header.buffer.getInt() & 0x7FFFFFF;
        delta = header.buffer.getInt() & 0x7FFFFFF;
    }


    // ---------------------------------------------------------- Nested Classes


    public static class WindowUpdateFrameBuilder extends SpdyFrameBuilder {

        private WindowUpdateFrame windowUpdateFrame;


        // -------------------------------------------------------- Constructors


        protected WindowUpdateFrameBuilder() {
            super(WindowUpdateFrame.create());
            windowUpdateFrame = (WindowUpdateFrame) frame;
        }


        // ------------------------------------------------------ Public Methods


        public WindowUpdateFrameBuilder streamId(final int streamId) {
            windowUpdateFrame.streamId = streamId;
            return this;
        }

        public WindowUpdateFrameBuilder delta(final int delta) {
            windowUpdateFrame.delta = delta;
            return this;
        }

        public WindowUpdateFrame build() {
            return windowUpdateFrame;
        }


        // --------------------------------------- Methods from SpdyFrameBuilder


        @Override
        protected WindowUpdateFrameBuilder getThis() {
            return this;
        }

    } // END WindowUpdateFrameBuilder

}