com.spotify.ffwd.riemann.RiemannUDPProtocolServer.java Source code

Introduction

Here is the source code for com.spotify.ffwd.riemann.RiemannUDPProtocolServer.java

Source

/*-
 * -\-\-
 * FastForward Riemann Module
 * --
 * Copyright (C) 2016 - 2018 Spotify AB
 * --
 * Licensed 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 com.spotify.ffwd.riemann;

import com.google.inject.Inject;
import com.spotify.ffwd.protocol.ProtocolServer;
import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandler;
import io.netty.channel.ChannelInitializer;
import io.netty.handler.codec.MessageToMessageDecoder;
import java.util.List;

/**
 * Decode individual frames, should only be used with UDP protocols.
 *
 * @author udoprog
 */
public class RiemannUDPProtocolServer implements ProtocolServer {
    @Inject
    private ChannelInboundHandler handler;

    @Inject
    private RiemannMessageDecoder messageDecoder;

    @Inject
    private RiemannDatagramDecoder datagramDecoder;

    private final MessageToMessageDecoder<List<Object>> unpacker = new MessageToMessageDecoder<List<Object>>() {
        @Override
        protected void decode(final ChannelHandlerContext ctx, final List<Object> messages, final List<Object> out)
                throws Exception {
            out.addAll(messages);
        }

        public boolean isSharable() {
            return true;
        }
    };

    @Override
    public final ChannelInitializer<Channel> initializer() {
        return new ChannelInitializer<Channel>() {
            @Override
            protected void initChannel(Channel ch) throws Exception {
                ch.pipeline().addLast(datagramDecoder, messageDecoder, unpacker, handler);
            }
        };
    }
}