Java tutorial
/* * Copyright 2017-present Open Networking Foundation * * 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 org.onosproject.artemis.impl.moas; import com.fasterxml.jackson.core.JsonProcessingException; import com.fasterxml.jackson.databind.ObjectMapper; import com.google.common.annotations.Beta; import io.netty.buffer.ByteBuf; import io.netty.buffer.Unpooled; import io.netty.channel.ChannelHandler.Sharable; import io.netty.channel.ChannelHandlerContext; import io.netty.channel.ChannelInboundHandlerAdapter; import io.netty.util.CharsetUtil; import org.onlab.packet.IpAddress; import org.onlab.packet.IpPrefix; import org.onosproject.artemis.ArtemisPacketProcessor; import org.onosproject.artemis.impl.objects.ArtemisMessage; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import java.io.IOException; /** * MOAS Client channel handler. */ @Sharable @Beta public class MoasClientHandler extends ChannelInboundHandlerAdapter { private static final Logger log = LoggerFactory.getLogger(MoasClientHandler.class); private IpAddress localIp; private IpPrefix localPrefix; private ArtemisPacketProcessor packetProcessor; MoasClientHandler(IpAddress localIp, IpPrefix localPrefix, ArtemisPacketProcessor packetProcessor) { this.localIp = localIp; this.packetProcessor = packetProcessor; this.localPrefix = localPrefix; } @Override public void channelActive(ChannelHandlerContext ctx) throws Exception { log.info("Connected to server {}", ctx.channel().remoteAddress()); ArtemisMessage message = new ArtemisMessage(); message.setType(ArtemisMessage.Type.INITIATE_FROM_CLIENT); message.setLocalIp(localIp.toString()); message.setLocalPrefix(localPrefix.toString()); ObjectMapper mapper = new ObjectMapper(); try { String jsonInString = mapper.writeValueAsString(message); ByteBuf buffer = Unpooled.copiedBuffer(jsonInString, CharsetUtil.UTF_8); ctx.writeAndFlush(buffer); } catch (JsonProcessingException e) { log.warn("channelActive()", e); } } @Override public void channelRead(ChannelHandlerContext ctx, Object msg) throws IOException { ByteBuf in = (ByteBuf) msg; String strMsg = in.toString(io.netty.util.CharsetUtil.US_ASCII); ObjectMapper mapper = new ObjectMapper(); ArtemisMessage actObj = mapper.readValue(strMsg, ArtemisMessage.class); packetProcessor.processMoasPacket(actObj, ctx); } @Override public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) { log.error("exceptionCaught()", cause); ctx.close(); } }