LoggerBase.cs

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// 
//  Copyright 2010-2015 Deveel
// 
//    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.
//

using System;
using System.Globalization;

namespace Deveel.Data.Diagnostics {
    public abstract class LoggerBase : ThreadedQueue<LogEntry> {
        protected LoggerBase(LoggerSettings settings) {
            Settings = settings;
        }

        ~LoggerBase() {
            Dispose(false);
        }

        public LoggerSettings Settings { get; private set; }

        protected override void Consume(LogEntry message) {
            var logMessage = FormatMessage(message);
            LogMessage(logMessage);
        }

        private string FormatMessage(LogEntry entry) {
            var format = Settings.MessageFormat;
            foreach (var key in entry.Keys) {
                var value = FormatValue(entry.GetValue(key));
                var holder = String.Format("{0}", key);

                format = format.Replace(holder, value);
            }

            return format;
        }

        private string FormatValue(object value) {
            if (value == null)
                return String.Empty;

            if (value is string)
                return (string) value;
            if (value is DateTime ||
                value is DateTimeOffset) {
                if (String.IsNullOrEmpty(Settings.DateFormat))
                    return value.ToString();

                if (value is DateTimeOffset)
                    return ((DateTimeOffset) value).ToString(Settings.DateFormat);

                return ((DateTime) value).ToString(Settings.DateFormat);
            }

            if (!(value is IConvertible))
                return String.Empty;

            return (string) Convert.ChangeType(value, typeof (string), CultureInfo.InvariantCulture);
        }

        protected abstract void LogMessage(string message);
    }
}