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/*
* Copyright 2012 The Netty Project
*
* The Netty Project licenses this file to you 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 io.netty.handler.logging;
import io.netty.channel.ChannelDuplexHandler;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandler.Sharable;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelPromise;
import io.netty.util.internal.logging.InternalLogLevel;
import io.netty.util.internal.logging.InternalLogger;
import io.netty.util.internal.logging.InternalLoggerFactory;
import java.net.SocketAddress;
/**
* A {@link ChannelHandler} that logs all events using a logging framework.
* By default, all events are logged at DEBUG level.
*/
@Sharable
public class LoggingHandler extends ChannelDuplexHandler {
private static final LogLevel DEFAULT_LEVEL = LogLevel.DEBUG;
protected final InternalLogger logger;
protected final InternalLogLevel internalLevel;
private final LogLevel level;
/**
* Creates a new instance whose logger name is the fully qualified class
* name of the instance with hex dump enabled.
*/
public LoggingHandler() {
this(DEFAULT_LEVEL);
}
/**
* Creates a new instance whose logger name is the fully qualified class
* name of the instance.
*
* @param level the log level
*/
public LoggingHandler(LogLevel level) {
if (level == null) {
throw new NullPointerException("level");
}
logger = InternalLoggerFactory.getInstance(getClass());
this.level = level;
internalLevel = level.toInternalLevel();
}
/**
* Creates a new instance with the specified logger name and with hex dump
* enabled.
*/
public LoggingHandler(Class clazz) {
this(clazz, DEFAULT_LEVEL);
}
/**
* Creates a new instance with the specified logger name.
*
* @param level the log level
*/
public LoggingHandler(Class clazz, LogLevel level) {
if (clazz == null) {
throw new NullPointerException("clazz");
}
if (level == null) {
throw new NullPointerException("level");
}
logger = InternalLoggerFactory.getInstance(clazz);
this.level = level;
internalLevel = level.toInternalLevel();
}
/**
* Creates a new instance with the specified logger name.
*/
public LoggingHandler(String name) {
this(name, DEFAULT_LEVEL);
}
/**
* Creates a new instance with the specified logger name.
*
* @param level the log level
*/
public LoggingHandler(String name, LogLevel level) {
if (name == null) {
throw new NullPointerException("name");
}
if (level == null) {
throw new NullPointerException("level");
}
logger = InternalLoggerFactory.getInstance(name);
this.level = level;
internalLevel = level.toInternalLevel();
}
/**
* Returns the {@link LogLevel} that this handler uses to log
*/
public LogLevel level() {
return level;
}
protected String format(ChannelHandlerContext ctx, String message) {
String chStr = ctx.channel().toString();
StringBuilder buf = new StringBuilder(chStr.length() + message.length() + 1);
buf.append(chStr);
buf.append(' ');
buf.append(message);
return buf.toString();
}
@Override
public void channelRegistered(ChannelHandlerContext ctx)
throws Exception {
if (logger.isEnabled(internalLevel)) {
logger.log(internalLevel, format(ctx, "REGISTERED"));
}
super.channelRegistered(ctx);
}
@Override
public void channelUnregistered(ChannelHandlerContext ctx)
throws Exception {
if (logger.isEnabled(internalLevel)) {
logger.log(internalLevel, format(ctx, "UNREGISTERED"));
}
super.channelUnregistered(ctx);
}
@Override
public void channelActive(ChannelHandlerContext ctx)
throws Exception {
if (logger.isEnabled(internalLevel)) {
logger.log(internalLevel, format(ctx, "ACTIVE"));
}
super.channelActive(ctx);
}
@Override
public void channelInactive(ChannelHandlerContext ctx)
throws Exception {
if (logger.isEnabled(internalLevel)) {
logger.log(internalLevel, format(ctx, "INACTIVE"));
}
super.channelInactive(ctx);
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx,
Throwable cause) throws Exception {
if (logger.isEnabled(internalLevel)) {
logger.log(internalLevel, format(ctx, "EXCEPTION: " + cause), cause);
}
super.exceptionCaught(ctx, cause);
}
@Override
public void userEventTriggered(ChannelHandlerContext ctx,
Object evt) throws Exception {
if (logger.isEnabled(internalLevel)) {
logger.log(internalLevel, format(ctx, "USER_EVENT: " + evt));
}
super.userEventTriggered(ctx, evt);
}
@Override
public void bind(ChannelHandlerContext ctx,
SocketAddress localAddress, ChannelPromise promise) throws Exception {
if (logger.isEnabled(internalLevel)) {
logger.log(internalLevel, format(ctx, "BIND(" + localAddress + ')'));
}
super.bind(ctx, localAddress, promise);
}
@Override
public void connect(ChannelHandlerContext ctx,
SocketAddress remoteAddress, SocketAddress localAddress,
ChannelPromise promise) throws Exception {
if (logger.isEnabled(internalLevel)) {
logger.log(internalLevel, format(ctx, "CONNECT(" + remoteAddress + ", " + localAddress + ')'));
}
super.connect(ctx, remoteAddress, localAddress, promise);
}
@Override
public void disconnect(ChannelHandlerContext ctx,
ChannelPromise promise) throws Exception {
if (logger.isEnabled(internalLevel)) {
logger.log(internalLevel, format(ctx, "DISCONNECT()"));
}
super.disconnect(ctx, promise);
}
@Override
public void close(ChannelHandlerContext ctx,
ChannelPromise promise) throws Exception {
if (logger.isEnabled(internalLevel)) {
logger.log(internalLevel, format(ctx, "CLOSE()"));
}
super.close(ctx, promise);
}
@Override
public void deregister(ChannelHandlerContext ctx,
ChannelPromise promise) throws Exception {
if (logger.isEnabled(internalLevel)) {
logger.log(internalLevel, format(ctx, "DEREGISTER()"));
}
super.deregister(ctx, promise);
}
@Override
public void read(ChannelHandlerContext ctx) {
ctx.read();
}
@Override
public void flush(ChannelHandlerContext ctx, ChannelPromise promise)
throws Exception {
ctx.flush(promise);
}
@Override
public void inboundBufferUpdated(ChannelHandlerContext ctx)
throws Exception {
ctx.fireInboundBufferUpdated();
}
}
