org.apache.hadoop.hdfs.server.datanode.web.dtp.Http2ResponseHandler.java Source code

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Here is the source code for org.apache.hadoop.hdfs.server.datanode.web.dtp.Http2ResponseHandler.java

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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.hadoop.hdfs.server.datanode.web.dtp;

import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.http.FullHttpResponse;
import io.netty.handler.codec.http2.HttpUtil;
import io.netty.util.concurrent.Promise;

import java.util.HashMap;
import java.util.Map;

public class Http2ResponseHandler extends SimpleChannelInboundHandler<FullHttpResponse> {

    private Map<Integer, Promise<FullHttpResponse>> streamId2Promise = new HashMap<>();

    @Override
    protected void channelRead0(ChannelHandlerContext ctx, FullHttpResponse msg) throws Exception {
        Integer streamId = msg.headers().getInt(HttpUtil.ExtensionHeaderNames.STREAM_ID.text());
        if (streamId == null) {
            System.err.println("HttpResponseHandler unexpected message received: " + msg);
            return;
        }
        if (streamId.intValue() == 1) {
            // this is the upgrade response message, just ignore it.
            return;
        }
        Promise<FullHttpResponse> promise;
        synchronized (this) {
            promise = streamId2Promise.get(streamId);
        }
        if (promise == null) {
            System.err.println("Message received for unknown stream id " + streamId);
        } else {
            // Do stuff with the message (for now just print it)
            promise.setSuccess(msg.retain());

        }
    }

    public void put(Integer streamId, Promise<FullHttpResponse> promise) {
        streamId2Promise.put(streamId, promise);
    }
}