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The Netty project is an effort to provide an asynchronous event-driven network application framework and tools for rapid development of maintainable high performance and high scalability protocol servers and clients. In other words, Netty is a NIO client server framework which enables quick and easy development of network applications such as protocol servers and clients. It greatly simplifies and streamlines network programming such as TCP and UDP socket server.

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/*
 * Copyright 2009 Red Hat, Inc.
 *
 * Red Hat 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 org.jboss.netty.util;

import org.jboss.netty.channel.ChannelPipeline;
import org.jboss.netty.channel.ChannelSink;
import org.jboss.netty.util.internal.SystemPropertyUtil;

/**
 * Determines if Netty is running in a debug mode or not.  Please note that
 * this is not a Java debug mode.  You can enable Netty debug mode by
 * specifying the {@code "org.jboss.netty.debug"} system property (e.g.
 * {@code java -Dorg.jboss.netty.debug ...})
 * 
 * If debug mode is disabled (default), the stack trace of the exceptions are
 * compressed to help debugging a user application.
 * 
 * If debug mode is enabled, the stack trace of the exceptions raised in
 * {@link ChannelPipeline} or {@link ChannelSink} are retained as it is to help
 * debugging Netty.
 *
 * @author The Netty Project
 * @author Trustin Lee
 *
 * @version $Rev: 2080 $, $Date: 2010-01-26 18:04:19 +0900 (Tue, 26 Jan 2010) $
 */
public class DebugUtil {

    /**
     * Returns {@code true} if and only if Netty debug mode is enabled.
     */
    public static boolean isDebugEnabled() {
        String value;
        try {
            value = SystemPropertyUtil.get("org.jboss.netty.debug");
        } catch (Exception e) {
            value = null;
        }

        if (value == null) {
            return false;
        }

        value = value.trim().toUpperCase();
        return !value.startsWith("N") &&
               !value.startsWith("F") &&
               !value.equals("0");
    }

    private DebugUtil() {
        // Unused
    }
}