Mercurial > hg > release > thermostat-1.0
view common/command/src/main/java/com/redhat/thermostat/common/command/MessageDecoder.java @ 1412:a0592d702416
Update copyright year in release branch.
reviewed-by: neugens
review-thread: http://icedtea.classpath.org/pipermail/thermostat/2014-June/009965.html
PR1821
author | Jon VanAlten <jon.vanalten@redhat.com> |
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date | Tue, 03 Jun 2014 11:55:56 -0600 |
parents | ccac9bcabaa0 |
children |
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/* * Copyright 2012-2014 Red Hat, Inc. * * This file is part of Thermostat. * * Thermostat is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published * by the Free Software Foundation; either version 2, or (at your * option) any later version. * * Thermostat is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with Thermostat; see the file COPYING. If not see * <http://www.gnu.org/licenses/>. * * Linking this code with other modules is making a combined work * based on this code. Thus, the terms and conditions of the GNU * General Public License cover the whole combination. * * As a special exception, the copyright holders of this code give * you permission to link this code with independent modules to * produce an executable, regardless of the license terms of these * independent modules, and to copy and distribute the resulting * executable under terms of your choice, provided that you also * meet, for each linked independent module, the terms and conditions * of the license of that module. An independent module is a module * which is not derived from or based on this code. If you modify * this code, you may extend this exception to your version of the * library, but you are not obligated to do so. If you do not wish * to do so, delete this exception statement from your version. */ package com.redhat.thermostat.common.command; import static org.jboss.netty.channel.Channels.fireMessageReceived; import java.util.logging.Level; import java.util.logging.Logger; import org.jboss.netty.buffer.ChannelBuffer; import org.jboss.netty.channel.Channel; import org.jboss.netty.channel.ChannelEvent; import org.jboss.netty.channel.ChannelHandlerContext; import org.jboss.netty.channel.MessageEvent; import org.jboss.netty.channel.SimpleChannelUpstreamHandler; import com.redhat.thermostat.common.utils.LoggingUtils; public abstract class MessageDecoder extends SimpleChannelUpstreamHandler { // testing hook boolean exceptionCaught = false; private static final Logger logger = LoggingUtils.getLogger(MessageDecoder.class); protected MessageDecoder() { super(); } @Override public void handleUpstream( ChannelHandlerContext ctx, ChannelEvent evt) throws Exception { if (!(evt instanceof MessageEvent)) { ctx.sendUpstream(evt); return; } MessageEvent e = (MessageEvent) evt; Object originalMessage = e.getMessage(); if (!(originalMessage instanceof ChannelBuffer)) { // Skip decoding, since we've received something // we don't know how to deal with anyway. ctx.sendUpstream(evt); } Message decodedMessage = null; try { decodedMessage = decode(e.getChannel(), (ChannelBuffer)originalMessage); } catch (InvalidMessageException ex) { logger.log(Level.WARNING, "Decoding failed on received message. Possible DoS attack!", ex); exceptionCaught = true; } if (decodedMessage != null) { fireMessageReceived(ctx, decodedMessage, e.getRemoteAddress()); } } /** * Transforms the specified received message into another message and return * the transformed message. Return {@code null} if the received message * is supposed to be discarded. * * @throws InvalidMessageException If the received message was not properly encoded. */ protected abstract Message decode(Channel channel, ChannelBuffer msg) throws InvalidMessageException; }