//

// CRANIUM.ConcurrentLogger - Concurrent Logger

// (c) 2007 Raúl Arrabales Moreno  

//

using System;

using System.Collections.Generic;

using System.Text;

// CCR Library

using Microsoft.Ccr.Core;

using Microsoft.Ccr.Core.Arbiters;

// Concurrent Logger is part of CRANIUM

namespace Cranium

{

    /// <summary>

    /// The Concurrent Logger LogLevel static class. Defines log levels.

    /// </summary>

    public static class LogLevel

    {

        // Predefined Log Levels

        /// <summary>

        /// <value>DEBUG Level is the highest level of log. ALL Messages are logged.</value>

        /// </summary>

        public const int DEBUG = 1;

        /// <summary>

        /// INFO Level is a highest level of log, i.e. Verbose. All messages except thise classified as DEBUG and INFO are logged.

        /// </summary>

        public const int INFO = 10;

        /// <summary>

        /// WARN Level is a medium level of log. All messages clasified as WARN, ERROR, and FATAL are logged.

        /// </summary>

        public const int WARN = 20;

        /// <summary>

        /// ERROR Level is a lower level of log. Only ERROR and FATAL messages are logged.

        /// </summary>

        public const int ERROR = 30;

        /// <summary>

        /// FATAL Level is the lower level of log. Only FATAL messages are logged.

        /// </summary>

        public const int FATAL = 40;

        /// <summary>

        /// Convert the int log level into a string. 

        /// </summary>

        /// <param name="level">Integer log level.</param>

        /// <returns>The corresponding string describing the log level, e.g. INFO.</returns>

        public static string getString(int level)

        {

            switch (level)

            {

                case LogLevel.DEBUG: { return "DEBUG"; break; }

                case LogLevel.INFO: { return "INFO"; break; }

                case LogLevel.WARN: { return "WARN"; break; }

                case LogLevel.ERROR: { return "ERROR"; break; }

                case LogLevel.FATAL: { return "FATAL"; break; }

            }

            return "undefined";

        }

    } 

    /// <summary>

    /// ConcurrentLogger Class. Provides Logging to a file facility.

    /// </summary>

    public class ConcurrentLogger

    {

        // CCR Dispatcher and Queue

        Dispatcher dispatcher;

        DispatcherQueue dq;

        // A string port where log messages are received.

        Port<String> stringPort;

        // Current log level

        int currentLevel;

        // Log File

        System.IO.StreamWriter streamWriter;

        String logFileName;

        /// <summary>

        /// Initialize the Concurrent Logger. 

        /// </summary>

        /// <param name="level">Log Level.</param>

        /// <param name="fileName">Name of the log file.</param>

        private void initConcurrentLogger(int level, string fileName)

        {

            currentLevel = level;

            logFileName = fileName;

            // Create the CCR Dispatcher (thread pool)

            dispatcher = new Dispatcher(0, "ConcurrentLogger Threads");

            // Create a dispatcher queue that queues work item tasks to the dispatcher

            dq = new DispatcherQueue("ConcurrentLogger DispatcherQueue", dispatcher);

            // Open the file

            streamWriter = new System.IO.StreamWriter(logFileName, true);

            streamWriter.AutoFlush = true;            

            // String Port: FIFO Queue to string objects.

            stringPort = new Port<string>();

            // Simply Receive log requests - persistent Receive           

            //Arbiter.Activate(dq, Arbiter.Receive(true, stringPort,

            //   delegate(String s) { streamWriter.WriteLine(s); }));

            // Receive log request, controlling errors and exclusive access

            Arbiter.Activate( dq, Arbiter.Interleave( 

                // Failure

                new TeardownReceiverGroup(),

                // ExclusiveExecution for Thread Safety

                new ExclusiveReceiverGroup(

                    Arbiter.Receive(true, stringPort, delegate(String s) {streamWriter.WriteLine(s);})),

                // Process concurrently as requests come in

                new ConcurrentReceiverGroup()

                )

             );

            // Write a header per each execution.

            stringPort.Post(" ");

            stringPort.Post("*** " + DateTime.Now.ToString() + 

                " - CRANIUM LOGGER INITIATED - Level: " + LogLevel.getString(currentLevel) + " ***");

            stringPort.Post(" ");

        }

        /// <summary>

        /// Default ConcurrentLogger Constructor. Assumes DEBUG level and cranium.log as the log file name. 

        /// </summary>        

        public ConcurrentLogger()

        {

            initConcurrentLogger(LogLevel.DEBUG, "cranium.log");            

        }

        /// <summary>

        /// ConcurrentLogger Constructor. Specifies log level. Assumes cranium.log as the log file name. 

        /// </summary>

        /// <param name="level">Log Level</param>        

        public ConcurrentLogger(int level)

        {

            initConcurrentLogger(level, "cranium.log");

        }

        /// <summary>

        /// ConcurrentLogger Constructor. Specifies name of the log file and log level.

        /// </summary>

        /// <param name="fileName">The name of the log file to write.</param>

        /// <param name="level">Log level</param>        

        public ConcurrentLogger(String fileName, int level)

        {

            initConcurrentLogger(level, fileName); 

        }

        /// <summary>

        /// Shutdown the Concurrent Logger. Disposes the thread dispatcher and closes the file.

        /// </summary>

        public void shutdown()

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