Example usage for io.netty.util.concurrent PromiseCombiner add

Introduction

In this page you can find the example usage for io.netty.util.concurrent PromiseCombiner add.

Prototype

@SuppressWarnings({ "unchecked", "rawtypes" })
public void add(Future future) 

Source Link

Document

Adds a new future to be combined.

Usage

From source file:com.linkedin.r2.transport.http.client.Http2StreamCodec.java

License:Apache License

@Override
public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
    if (!(msg instanceof RequestWithCallback)) {
        ctx.write(msg, promise);/*from   w ww. j  a va  2s.  c o  m*/
        return;
    }

    Request request = ((RequestWithCallback) msg).request();
    Http2ConnectionEncoder encoder = encoder();
    int streamId = connection().local().incrementAndGetNextStreamId();
    if (request instanceof StreamRequest) {
        LOG.debug("Writing StreamRequest...");
        StreamRequest streamRequest = (StreamRequest) request;
        Http2Headers http2Headers = NettyRequestAdapter.toHttp2Headers(streamRequest);
        BufferedReader reader = new BufferedReader(ctx, encoder, streamId,
                ((RequestWithCallback) msg).handle());
        streamRequest.getEntityStream().setReader(reader);
        encoder.writeHeaders(ctx, streamId, http2Headers, NO_PADDING, NOT_END_STREAM, promise)
                .addListener(future -> reader.request());
        LOG.debug("Sent HTTP/2 HEADERS frame, stream={}, end={}, headers={}, padding={}bytes",
                new Object[] { streamId, NOT_END_STREAM, http2Headers.size(), NO_PADDING });
    } else if (request instanceof RestRequest) {
        LOG.debug("Writing RestRequest...");
        PromiseCombiner promiseCombiner = new PromiseCombiner();
        ChannelPromise headersPromise = ctx.channel().newPromise();
        ChannelPromise dataPromise = ctx.channel().newPromise();
        promiseCombiner.add(headersPromise);
        promiseCombiner.add(dataPromise);
        promiseCombiner.finish(promise);

        RestRequest restRequest = (RestRequest) request;
        Http2Headers headers = NettyRequestAdapter.toHttp2Headers(restRequest);
        encoder.writeHeaders(ctx, streamId, headers, NO_PADDING, NOT_END_STREAM, headersPromise);
        LOG.debug("Sent HTTP/2 HEADERS frame, stream={}, end={}, headers={}, padding={}bytes",
                new Object[] { streamId, NOT_END_STREAM, headers.size(), NO_PADDING });
        ByteBuf data = Unpooled.wrappedBuffer(restRequest.getEntity().asByteBuffer());
        encoder.writeData(ctx, streamId, data, NO_PADDING, END_STREAM, dataPromise);
        LOG.debug("Sent HTTP/2 DATA frame, stream={}, end={}, data={}bytes, padding={}bytes",
                new Object[] { streamId, END_STREAM, data.readableBytes(), NO_PADDING });
    } else {
        // Request type is not supported. Returns channel back to the pool and throws exception.
        ctx.fireChannelRead(((RequestWithCallback) msg).handle());
        throw new IllegalArgumentException("Request is neither StreamRequest or RestRequest");
    }

    // Sets TransportCallback as a stream property to be retrieved later
    TransportCallback<?> callback = ((RequestWithCallback) msg).callback();
    Http2Connection.PropertyKey callbackKey = ctx.channel()
            .attr(Http2ClientPipelineInitializer.CALLBACK_ATTR_KEY).get();
    connection().stream(streamId).setProperty(callbackKey, callback);

    // Sets AsyncPoolHandle as a stream property to be retrieved later
    AsyncPoolHandle<?> handle = ((RequestWithCallback) msg).handle();
    Http2Connection.PropertyKey handleKey = ctx.channel()
            .attr(Http2ClientPipelineInitializer.CHANNEL_POOL_HANDLE_ATTR_KEY).get();
    connection().stream(streamId).setProperty(handleKey, handle);
}

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