Java tutorial
/******************************************************************************* * Copyright (c) 2007, 2014 Massimiliano Ziccardi * * 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 it.jnrpe.net; import io.netty.channel.ChannelFuture; import io.netty.channel.ChannelFutureListener; import io.netty.channel.ChannelHandlerContext; import io.netty.channel.ChannelInboundHandlerAdapter; import io.netty.util.ReferenceCountUtil; import it.jnrpe.IJNRPEExecutionContext; import it.jnrpe.JNRPELogger; import it.jnrpe.ReturnValue; import it.jnrpe.commands.CommandInvoker; /** * Receives and handles connections to the JNRPE server. * * @author Massimiliano Ziccardi * @version $Revision: 1.0 $ */ public class JNRPEServerHandler extends ChannelInboundHandlerAdapter { /** * Field LOG. */ private final JNRPELogger LOG = new JNRPELogger(this); /** * The command invoker. */ private final CommandInvoker commandInvoker; /** * The list of listener that will receive JNRPE events. */ private final IJNRPEExecutionContext context; /** * Constructor. * * @param invoker * the command invoker * @param ctx * The execution context */ public JNRPEServerHandler(final CommandInvoker invoker, final IJNRPEExecutionContext ctx) { commandInvoker = invoker; context = ctx; } /** * Method channelRead. * @param ctx ChannelHandlerContext * @param msg Object * @see io.netty.channel.ChannelInboundHandler#channelRead(ChannelHandlerContext, Object) */ @Override public final void channelRead(final ChannelHandlerContext ctx, final Object msg) { try { JNRPERequest req = (JNRPERequest) msg; ReturnValue ret = commandInvoker.invoke(req.getCommand(), req.getArguments()); JNRPEResponse res = new JNRPEResponse(); res.setPacketVersion(PacketVersion.VERSION_2); res.setResultCode(ret.getStatus().intValue()); res.setMessage(ret.getMessage()); ChannelFuture channelFuture = ctx.writeAndFlush(res); channelFuture.addListener(ChannelFutureListener.CLOSE); } finally { ReferenceCountUtil.release(msg); } } /** * Method exceptionCaught. * @param ctx ChannelHandlerContext * @param cause Throwable * @see io.netty.channel.ChannelInboundHandler#exceptionCaught(ChannelHandlerContext, Throwable) */ @Override public final void exceptionCaught(final ChannelHandlerContext ctx, final Throwable cause) { LOG.error(context, cause.getMessage(), cause); //context.getEventBus().post(new LogEvent(this, LogEventType.ERROR, cause.getMessage(), cause)); //EventsUtil.sendEvent(listeners, this, LogEvent.ERROR, cause.getMessage(), cause); ctx.close(); } /** * Method toString. * @return String */ @Override public String toString() { return "JNRPEServerHandler [commandInvoker=" + commandInvoker + ", context=" + context + "]"; } }