102 lines
4.0 KiB
Java
102 lines
4.0 KiB
Java
/*
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* Copyright 2014 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License, version 2.0 (the
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* "License"); you may not use this file except in compliance with the License. You may obtain a
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* copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software distributed under the License
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* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
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* or implied. See the License for the specific language governing permissions and limitations under
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* the License.
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*/
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package io.netty.example.http2.helloworld.client;
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import io.netty.buffer.ByteBuf;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.channel.ChannelPromise;
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import io.netty.channel.SimpleChannelInboundHandler;
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import io.netty.handler.codec.http.FullHttpResponse;
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import io.netty.handler.codec.http2.HttpUtil;
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import io.netty.util.CharsetUtil;
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import java.util.Iterator;
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import java.util.Map.Entry;
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import java.util.SortedMap;
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import java.util.TreeMap;
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import java.util.concurrent.TimeUnit;
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/**
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* Process {@link FullHttpResponse} translated from HTTP/2 frames
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*/
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public class HttpResponseHandler extends SimpleChannelInboundHandler<FullHttpResponse> {
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private SortedMap<Integer, ChannelPromise> streamidPromiseMap;
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public HttpResponseHandler() {
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streamidPromiseMap = new TreeMap<Integer, ChannelPromise>();
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}
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/**
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* Create an association between an anticipated response stream id and a {@link ChannelPromise}
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*
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* @param streamId The stream for which a response is expected
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* @param promise The promise object that will be used to wait/notify events
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* @return The previous object associated with {@code streamId}
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* @see HttpResponseHandler#awaitResponses(long, TimeUnit)
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*/
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public ChannelPromise put(int streamId, ChannelPromise promise) {
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return streamidPromiseMap.put(streamId, promise);
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}
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/**
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* Wait (sequentially) for a time duration for each anticipated response
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*
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* @param timeout Value of time to wait for each response
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* @param unit Units associated with {@code timeout}
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* @see HttpResponseHandler#put(int, ChannelPromise)
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*/
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public void awaitResponses(long timeout, TimeUnit unit) {
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Iterator<Entry<Integer, ChannelPromise>> itr = streamidPromiseMap.entrySet().iterator();
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while (itr.hasNext()) {
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Entry<Integer, ChannelPromise> entry = itr.next();
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ChannelPromise promise = entry.getValue();
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if (!promise.awaitUninterruptibly(timeout, unit)) {
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throw new IllegalStateException("Timed out waiting for response on stream id " + entry.getKey());
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}
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if (!promise.isSuccess()) {
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throw new RuntimeException(promise.cause());
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}
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System.out.println("---Stream id: " + entry.getKey() + " received---");
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itr.remove();
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}
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}
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@Override
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protected void messageReceived(ChannelHandlerContext ctx, FullHttpResponse msg) throws Exception {
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Integer streamId = msg.headers().getInt(HttpUtil.ExtensionHeaderNames.STREAM_ID.text());
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if (streamId == null) {
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System.err.println("HttpResponseHandler unexpected message received: " + msg);
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return;
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}
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ChannelPromise promise = streamidPromiseMap.get(streamId);
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if (promise == null) {
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System.err.println("Message received for unknown stream id " + streamId);
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} else {
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// Do stuff with the message (for now just print it)
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ByteBuf content = msg.content();
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if (content.isReadable()) {
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int contentLength = content.readableBytes();
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byte[] arr = new byte[contentLength];
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content.readBytes(arr);
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System.out.println(new String(arr, 0, contentLength, CharsetUtil.UTF_8));
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}
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promise.setSuccess();
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}
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}
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}
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