Java tutorial
/* * Copyright (c) 2015 Uber Technologies, Inc. * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ package com.uber.tchannel.handlers; import com.uber.tchannel.api.errors.TChannelError; import com.uber.tchannel.api.errors.TChannelProtocol; import com.uber.tchannel.channels.PeerManager; import com.uber.tchannel.codecs.MessageCodec; import com.uber.tchannel.codecs.TFrame; import com.uber.tchannel.frames.InitFrame; import com.uber.tchannel.frames.InitResponseFrame; import com.uber.tchannel.frames.Frame; import io.netty.buffer.ByteBuf; import io.netty.channel.ChannelHandlerContext; import io.netty.channel.SimpleChannelInboundHandler; public class InitRequestInitiator extends SimpleChannelInboundHandler<ByteBuf> { private final PeerManager peerManager; public InitRequestInitiator(PeerManager peerManager) { this.peerManager = peerManager; } @Override protected void messageReceived(ChannelHandlerContext ctx, ByteBuf buf) throws TChannelError { Frame frame = MessageCodec.decode(MessageCodec.decode(buf)); switch (frame.getType()) { case InitResponse: InitResponseFrame initResponseFrameMessage = (InitResponseFrame) frame; if (initResponseFrameMessage.getVersion() == InitFrame.DEFAULT_VERSION) { ctx.pipeline().remove(this); peerManager.setIdentified(ctx.channel(), initResponseFrameMessage.getHeaders()); } else { // This will lead to a connection reset throw new TChannelProtocol(String.format("Expected Protocol version: %d, got version: %d", InitFrame.DEFAULT_VERSION, initResponseFrameMessage.getVersion())); } break; default: // This will lead to a connection reset throw new TChannelProtocol("Frame recieved before Init Response"); } } }