webeventbuffer.cs source code in C# .NET

                        
Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / Web / Management / webeventbuffer.cs / 1305376 / webeventbuffer.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Web.Management { 
    using System.Configuration; 
    using System.Web.Configuration;
    using System.Configuration.Provider; 
    using System.Collections.Specialized;
    using System.Collections;
    using System.Web.Util;
    using System.Web.Mail; 
    using System.Globalization;
    using System.Xml; 
    using System.Threading; 
    using System.Web.Hosting;
    using System.Security.Permissions; 

    public enum EventNotificationType
    {
        // regularly scheduled notification 
        Regular,
 
        // urgent notification 
        Urgent,
 
        // notification triggered by a user requested flush
        Flush,

        // Notification fired when buffer=false 
        Unbuffered,
    } 
 
    internal enum FlushCallReason {
        UrgentFlushThresholdExceeded, 
        Timer,
        StaticFlush
    }
 
    public sealed class WebEventBufferFlushInfo {
        WebBaseEventCollection  _events; 
        DateTime                _lastNotification; 
        int                     _eventsDiscardedSinceLastNotification;
        int                     _eventsInBuffer; 
        int                     _notificationSequence;
        EventNotificationType   _notificationType;

        internal WebEventBufferFlushInfo(  WebBaseEventCollection events, 
                                            EventNotificationType notificationType,
                                            int notificationSequence, 
                                            DateTime lastNotification, 
                                            int eventsDiscardedSinceLastNotification,
                                            int eventsInBuffer) { 
            _events = events;
            _notificationType = notificationType;
            _notificationSequence = notificationSequence;
            _lastNotification = lastNotification; 
            _eventsDiscardedSinceLastNotification = eventsDiscardedSinceLastNotification;
            _eventsInBuffer = eventsInBuffer; 
        } 

        public WebBaseEventCollection  Events { 
            get { return _events; }
        }

        public DateTime LastNotificationUtc { 
            get { return _lastNotification; }
        } 
 
        public int EventsDiscardedSinceLastNotification {
            get { return _eventsDiscardedSinceLastNotification; } 
        }

        public int EventsInBuffer {
            get { return _eventsInBuffer; } 
        }
 
        public int NotificationSequence { 
            get { return _notificationSequence; }
        } 

        public EventNotificationType NotificationType {
            get { return _notificationType; }
        } 

    } 
 
    internal delegate void WebEventBufferFlushCallback(WebEventBufferFlushInfo flushInfo);
 
    internal sealed class WebEventBuffer {

        static long Infinite = Int64.MaxValue;
 
        long        _burstWaitTimeMs = 2 * 1000;
 
        BufferedWebEventProvider    _provider; 

        long        _regularFlushIntervalMs; 
        int         _urgentFlushThreshold;
        int         _maxBufferSize;
        int         _maxFlushSize;
        long        _urgentFlushIntervalMs; 
        int         _maxBufferThreads;
 
        Queue       _buffer = null; 
        Timer       _timer;
        DateTime    _lastFlushTime = DateTime.MinValue; 
        DateTime    _lastScheduledFlushTime = DateTime.MinValue;
        DateTime    _lastAdd = DateTime.MinValue;
        DateTime    _startTime = DateTime.MinValue;
        bool        _urgentFlushScheduled; 
        int         _discardedSinceLastFlush = 0;
        int         _threadsInFlush = 0; 
        int         _notificationSequence = 0; 
        bool        _regularTimeoutUsed;
 
#if DBG
        DateTime    _nextFlush = DateTime.MinValue;
        DateTime    _lastRegularFlush = DateTime.MinValue;
        DateTime    _lastUrgentFlush = DateTime.MinValue; 
        int         _totalAdded = 0;
        int         _totalFlushed = 0; 
        int         _totalAbandoned = 0; 
#endif
 
        WebEventBufferFlushCallback _flushCallback;

        internal WebEventBuffer(BufferedWebEventProvider provider, string bufferMode,
                        WebEventBufferFlushCallback callback) { 
            Debug.Assert(callback != null, "callback != null");
 
            _provider = provider; 

            HealthMonitoringSection section = RuntimeConfig.GetAppLKGConfig().HealthMonitoring; 

            BufferModesCollection bufferModes = section.BufferModes;

            BufferModeSettings bufferModeInfo = bufferModes[bufferMode]; 
            if (bufferModeInfo == null) {
                throw new ConfigurationErrorsException(SR.GetString(SR.Health_mon_buffer_mode_not_found, bufferMode)); 
            } 

            if (bufferModeInfo.RegularFlushInterval == TimeSpan.MaxValue) { 
                _regularFlushIntervalMs = Infinite;
            }
            else {
                try { 
                    _regularFlushIntervalMs = (long)bufferModeInfo.RegularFlushInterval.TotalMilliseconds;
                } 
                catch (OverflowException) { 
                    _regularFlushIntervalMs = Infinite;
                } 
            }

            if (bufferModeInfo.UrgentFlushInterval == TimeSpan.MaxValue) {
                _urgentFlushIntervalMs = Infinite; 
            }
            else { 
                try { 
                    _urgentFlushIntervalMs = (long)bufferModeInfo.UrgentFlushInterval.TotalMilliseconds;
                } 
                catch (OverflowException) {
                    _urgentFlushIntervalMs = Infinite;
                }
            } 

            _urgentFlushThreshold = bufferModeInfo.UrgentFlushThreshold; 
            _maxBufferSize = bufferModeInfo.MaxBufferSize; 
            _maxFlushSize = bufferModeInfo.MaxFlushSize;
            _maxBufferThreads = bufferModeInfo.MaxBufferThreads; 

            _burstWaitTimeMs = Math.Min(_burstWaitTimeMs, _urgentFlushIntervalMs);

            _flushCallback = callback; 

            _buffer = new Queue(); 
 
            if (_regularFlushIntervalMs != Infinite) {
                _startTime = DateTime.UtcNow; 
                _regularTimeoutUsed = true;
                _urgentFlushScheduled = false;
                SetTimer(GetNextRegularFlushDueTimeInMs());
            } 

            Debug.Trace("WebEventBuffer", 
                        "\n_regularFlushIntervalMs=" + _regularFlushIntervalMs + 
                        "\n_urgentFlushThreshold=" + _urgentFlushThreshold +
                        "\n_maxBufferSize=" + _maxBufferSize + 
                        "\n_maxFlushSize=" + _maxFlushSize +
                        "\n_urgentFlushIntervalMs=" + _urgentFlushIntervalMs);
        }
 
        void FlushTimerCallback(object state) {
            Flush(_maxFlushSize, FlushCallReason.Timer); 
        } 

        // 
        // If we're in notification mode, meaning urgentFlushThreshold="1", we'll flush
        // as soon as there's an event in the buffer.
        //
        // For example, if bufferMode == "notification", we have this setting: 
        //   
        //
        // The ideal situation is that we have events coming in regularly, 
        // and we flush (max 20 events at a time), wait for _urgentFlushIntervalMs (1 minute),
        // then flush the buffer, then wait 1 minute, then flush, and so on and on.
        //
        // However, there is a scenario where there's been no event coming in, and suddenly 
        // a burst of events (e.g. 20) arrive. If we flush immediately when the 1st event comes in,
        // we then have to wait for 1 minute before we can flush the remaining 19 events. 
        // 
        // To solve this problem, we demand that if we're in notification mode, and
        // we just added an event to an empty buffer, then we may anticipate a burst 
        // by waiting _burstWaitTimeMs amount of time (2s).
        //
        // But how long does a buffer needs to be empty before we consider
        // waiting for a burst?  We cannot come up with a good formula, and thus 
        // pick this:
        //      ((now - _lastAdd).TotalMilliseconds) >= _urgentFlushIntervalMs 
        // 
        bool AnticipateBurst(DateTime now) {
            // Please note this is called while we're within the lock held in AddEvent. 
            return _urgentFlushThreshold == 1 &&    // we're in notification mode
                    _buffer.Count == 1 &&           // we just added an event to an empty buffer
                    ((now - _lastAdd).TotalMilliseconds) >= _urgentFlushIntervalMs;
        } 

        long GetNextRegularFlushDueTimeInMs() { 
            long   nextRegularFlushFromStartTime; 
            long   nowFromStartTime;
            long   regularFlushIntervalms = _regularFlushIntervalMs; 

            // Need to calculate in milliseconds in order to avoid time shift due to round-down
            if (_regularFlushIntervalMs == Infinite) {
                return Infinite; 
            }
 
            DateTime    now = DateTime.UtcNow; 
            nowFromStartTime = (long)((now - _startTime).TotalMilliseconds);
 
            // For some unknown reason the Timer may fire prematurely (usually less than 50ms).  This will bring
            // us into a situation where the timer fired just tens of milliseconds before the originally planned
            // fire time, and this method will return a due time == tens of milliseconds.
            // To workaround this problem, I added 499 ms when doing the calculation to compensate for a 
            // premature firing.
            nextRegularFlushFromStartTime = ((nowFromStartTime + regularFlushIntervalms + 499) / regularFlushIntervalms) * regularFlushIntervalms; 
 
            Debug.Assert(nextRegularFlushFromStartTime >= nowFromStartTime);
 
            return nextRegularFlushFromStartTime - nowFromStartTime;
        }

        void SetTimer(long waitTimeMs) { 
            if (_timer == null) {
                _timer = new System.Threading.Timer(new TimerCallback(this.FlushTimerCallback), 
                                                null, waitTimeMs, Timeout.Infinite); 
            }
            else { 
                _timer.Change(waitTimeMs, Timeout.Infinite);
            }

#if DBG 
            _nextFlush = DateTime.UtcNow.AddMilliseconds(waitTimeMs);
#endif 
        } 

        // This method can be called by the timer, or by AddEvent. 
        //
        // Basic design:
        // - We have one timer, and one buffer.
        // - We flush periodically every _regularFlushIntervalMs ms 
        // - But if # of items in buffer has reached _urgentFlushThreshold, we will flush more frequently,
        //   but at most once every _urgentFlushIntervalMs ms.  However, these urgent flushes will not 
        //   prevent the regular flush from happening. 
        // - We never flush synchronously, meaning if we're called by AddEvent and decide to flush
        //   because we've reached the _urgentFlushThreshold, we will still use the timer thread 
        //   to flush the buffer.
        // - At any point only a maximum of _maxBufferThreads threads can be flushing.  If exceeded,
        //   we will delay a flush.
        // 
        //
 
        // For example, let's say we have this setting: 
        // "1 minute urgentFlushInterval and 5 minute regularFlushInterval"
        // 
        // Assume regular flush timer starts at 10:00am.  It means regular
        // flush will happen at 10:05am, 10:10am, 10:15am, and so on,
        // regardless of when urgent flush happens.
        // 
        // An "urgent flush" happens whenever urgentFlushThreshold is reached.
        // However, when we schedule an "urgent flush", we ensure that the time 
        // between an urgent flush and the last flush (no matter it's urgent or 
        // regular) will be at least urgentFlushInterval.
        // 
        // One interesting case here.  Assume at 10:49:30 we had an urgent
        // flush, but the # of events left is still above urgentFlushThreshold.
        // You may think we'll schedule the next urgent flush at 10:50:30
        // (urgentFlushInterval == 1 min).  However, because we know we will 
        // have a regular flush at 10:50:00, we won't schedule the next urgent
        // flush.  Instead, during the regular flush at 10:50:00 happens, we'll 
        // check if there're still too many events; and if so, we will schedule 
        // the next urgent flush at 10:51:00.
        // 
        internal void Flush(int max, FlushCallReason reason) {
            WebBaseEvent[]  events = null;
            DateTime    nowUtc = DateTime.UtcNow;
            long        waitTime = 0; 
            DateTime    lastFlushTime = DateTime.MaxValue;
            int         discardedSinceLastFlush = -1; 
            int         eventsInBuffer = -1; 
            int         toFlush = 0;
            EventNotificationType   notificationType = EventNotificationType.Regular; 

            // By default, this call will flush, but will not schedule the next flush.
            bool        flushThisTime = true;
            bool        scheduleNextFlush = false; 
            bool        nextFlushIsUrgent = false;
 
            lock(_buffer) { 
                Debug.Assert(max > 0, "max > 0");
 
                if (_buffer.Count == 0) {
                    // We have nothing in the buffer.  Don't flush this time.
                    Debug.Trace("WebEventBufferExtended", "Flush: buffer is empty, don't flush");
                    flushThisTime = false; 
                }
 
                switch (reason) { 
                case FlushCallReason.StaticFlush:
                    // It means somebody calls provider.Flush() 
                    break;

                case FlushCallReason.Timer:
                    // It's a callback from a timer.  We will schedule the next regular flush if needed. 

                    if (_regularFlushIntervalMs != Infinite) { 
                        scheduleNextFlush = true; 
                        waitTime = GetNextRegularFlushDueTimeInMs();
                    } 
                    break;

                case FlushCallReason.UrgentFlushThresholdExceeded:
                    // It means this method is called by AddEvent because the urgent flush threshold is reached. 

                    // If an urgent flush has already been scheduled by someone else, we don't need to duplicate the 
                    // effort.  Just return. 
                    if (_urgentFlushScheduled) {
                        return; 
                    }

                    // Flush triggered by AddEvent isn't synchronous, so we won't flush this time, but will
                    // schedule an urgent flush instead. 
                    flushThisTime = false;
                    scheduleNextFlush = true; 
                    nextFlushIsUrgent = true; 

                    // Calculate how long we have to wait when scheduling the flush 
                    if (AnticipateBurst(nowUtc)) {
                        Debug.Trace("WebEventBuffer", "Flush: Called by AddEvent.  Waiting for burst");
                        waitTime = _burstWaitTimeMs;
                    } 
                    else {
                        Debug.Trace("WebEventBuffer", "Flush: Called by AddEvent.  Schedule an immediate flush"); 
                        waitTime = 0; 
                    }
 
                    // Have to wait longer because of _urgentFlushIntervalMs
                    long    msSinceLastScheduledFlush = (long)(nowUtc - _lastScheduledFlushTime).TotalMilliseconds;
                    if (msSinceLastScheduledFlush + waitTime < _urgentFlushIntervalMs ) {
 
                        Debug.Trace("WebEventBuffer", "Flush: Called by AddEvent.  Have to wait longer because of _urgentFlushIntervalMs.");
                        waitTime = _urgentFlushIntervalMs - msSinceLastScheduledFlush; 
                    } 

                    Debug.Trace("WebEventBuffer", "Wait time=" + waitTime + 
                        "; nowUtc=" + PrintTime(nowUtc) +
                        "; _lastScheduledFlushTime=" + PrintTime(_lastScheduledFlushTime) +
                        "; _urgentFlushIntervalMs=" + _urgentFlushIntervalMs);
 
                    break;
                } 
 
                Debug.Trace("WebEventBuffer", "Flush called: max=" + max +
                    "; reason=" + reason); 

                if (flushThisTime) {
                    // Check if we've exceeded the # of flushing threads.  If so,
                    // don't flush this time. 

                    if (_threadsInFlush >= _maxBufferThreads) { 
                        // Won't set flushThisTime to false because we depend on 
                        // the logic inside the next "if" block to schedule the
                        // next urgent flush as needed. 
                        toFlush = 0;
                    }
                    else {
                        toFlush = Math.Min(_buffer.Count, max); 
                    }
                } 
 
#if DBG
                DebugUpdateStats(flushThisTime, nowUtc, toFlush, reason); 
#endif

                if (flushThisTime) {
                    Debug.Assert(reason != FlushCallReason.UrgentFlushThresholdExceeded, "reason != FlushCallReason.UrgentFlushThresholdExceeded"); 

                    if (toFlush > 0) { 
                        // Move the to-be-flushed events to an array 
                        events = new WebBaseEvent[toFlush];
 
                        for (int i = 0; i < toFlush; i++) {
                            events[i] = (WebBaseEvent)_buffer.Dequeue();
                        }
 
                        lastFlushTime = _lastFlushTime;
 
                        // Update _lastFlushTime and _lastScheduledFlushTime. 
                        // These information are used when Flush is called the next time.
                        _lastFlushTime = nowUtc; 
                        if (reason == FlushCallReason.Timer) {
                            _lastScheduledFlushTime = nowUtc;
                        }
 
                        discardedSinceLastFlush = _discardedSinceLastFlush;
                        _discardedSinceLastFlush = 0; 
 
                        if (reason == FlushCallReason.StaticFlush) {
                            notificationType = EventNotificationType.Flush; 
                        }
                        else {
                            Debug.Assert(!(!_regularTimeoutUsed && !_urgentFlushScheduled),
                                "It's impossible to have a non-regular flush and yet the flush isn't urgent"); 

                            notificationType = _regularTimeoutUsed ? 
                                               EventNotificationType.Regular : 
                                               EventNotificationType.Urgent;
                        } 
                    }

                    eventsInBuffer = _buffer.Count;
 
                    // If we still have at least _urgentFlushThreshold left, set timer
                    // to flush asap. 
                    if (eventsInBuffer >= _urgentFlushThreshold) { 
                        Debug.Trace("WebEventBuffer", "Flush: going to flush " + toFlush + " events, but still have at least _urgentFlushThreshold left. Schedule a flush");
                        scheduleNextFlush = true; 
                        nextFlushIsUrgent = true;
                        waitTime = _urgentFlushIntervalMs;
                    }
                    else { 
                        Debug.Trace("WebEventBuffer", "Flush: going to flush " + toFlush + " events");
                    } 
                } 

                // We are done moving the flushed events to the 'events' array. 
                // Now schedule the next flush if needed.

                _urgentFlushScheduled = false;
 
                if (scheduleNextFlush) {
                    if (nextFlushIsUrgent) { 
                        long nextRegular = GetNextRegularFlushDueTimeInMs(); 

                        // If next regular flush is closer than next urgent flush, 
                        // use regular flush instead.
                        if (nextRegular < waitTime) {
                            Debug.Trace("WebEventBuffer", "Switch to use regular timeout");
                            waitTime = nextRegular; 
                            _regularTimeoutUsed = true;
                        } 
                        else { 
                            _regularTimeoutUsed = false;
                        } 
                    }
                    else {
                        _regularTimeoutUsed = true;
                    } 

                    SetTimer(waitTime); 
                    _urgentFlushScheduled = nextFlushIsUrgent; 
#if DBG
                    Debug.Trace("WebEventBuffer", "Flush: Registered for a flush.  Waittime = " + waitTime + "ms" + 
                        "; _nextFlush=" + PrintTime(_nextFlush) +
                        "; _urgentFlushScheduled=" + _urgentFlushScheduled);
#endif
 
                }
 
                // Cleanup.  If we are called by a timer callback, but we haven't scheduled for the next 
                // one (can only happen if _regularFlushIntervalMs == Infinite), we should dispose the timer
                if (reason == FlushCallReason.Timer && !scheduleNextFlush) { 
                    Debug.Trace("WebEventBuffer", "Flush: Disposing the timer");
                    Debug.Assert(_regularFlushIntervalMs == Infinite, "We can dispose the timer only if _regularFlushIntervalMs == Infinite");
                    ((IDisposable)_timer).Dispose();
                    _timer = null; 
                    _urgentFlushScheduled = false;
                } 
 
                // We want to increment the thread count within the lock to ensure we don't let too many threads in
                if (events != null) { 
                    Interlocked.Increment(ref _threadsInFlush);
                }
            } // Release lock
 
            // Now call the providers to flush the events
            if (events != null) { 
                Debug.Assert(lastFlushTime != DateTime.MaxValue, "lastFlushTime != DateTime.MaxValue"); 
                Debug.Assert(discardedSinceLastFlush != -1, "discardedSinceLastFlush != -1");
                Debug.Assert(eventsInBuffer != -1, "eventsInBuffer != -1"); 

                Debug.Trace("WebEventBufferSummary", "_threadsInFlush=" + _threadsInFlush);

                using (new ApplicationImpersonationContext()) { 
                    try {
                        WebEventBufferFlushInfo flushInfo = new WebEventBufferFlushInfo( 
                                                                new WebBaseEventCollection(events), 
                                                                notificationType,
                                                                Interlocked.Increment(ref _notificationSequence), 
                                                                lastFlushTime,
                                                                discardedSinceLastFlush,
                                                                eventsInBuffer);
 
                        _flushCallback(flushInfo);
                    } 
                    catch (Exception e) { 
                        try {
                            _provider.LogException(e); 
                        }
                        catch {
                            // Ignore all errors
                        } 
                    }
#pragma warning disable 1058 
                    catch { // non compliant exceptions are caught and logged as Unknown 
                        try {
                            _provider.LogException(new Exception(SR.GetString(SR.Provider_Error))); 
                        }
                        catch {
                            // Ignore all errors
                        } 
                    }
#pragma warning restore 1058 
                } 

                Interlocked.Decrement(ref _threadsInFlush); 
            }
        }

        internal void AddEvent(WebBaseEvent webEvent) { 
            lock(_buffer) {
#if DBG 
                _totalAdded++; 
#endif
                // If we have filled up the buffer, remove items using FIFO order. 
                if (_buffer.Count == _maxBufferSize) {
                    Debug.Trace("WebEventBuffer", "Buffer is full.  Need to remove one from the tail");
                    _buffer.Dequeue();
                    _discardedSinceLastFlush++; 
#if DBG
                    _totalAbandoned++; 
#endif 
                }
 
                _buffer.Enqueue(webEvent);

                // If we have at least _urgentFlushThreshold, flush.  Please note the flush is async.
                if (_buffer.Count >= _urgentFlushThreshold) { 
                    Flush(_maxFlushSize, FlushCallReason.UrgentFlushThresholdExceeded);
                } 
 
                // Note that Flush uses _lastAdd, which is the time an event (not including this one)
                // was last added.  That's why we call it after calling Flush. 
                _lastAdd = DateTime.UtcNow;
            }   // Release the lock
        }
 
        internal void Shutdown() {
            if (_timer != null) { 
                _timer.Dispose(); 
                _timer = null;
            } 
        }

        string PrintTime(DateTime t) {
            return t.ToString("T", DateTimeFormatInfo.InvariantInfo) + "." + t.Millisecond.ToString("d03", CultureInfo.InvariantCulture); 
        }
 
 
#if DBG
        void DebugUpdateStats(bool flushThisTime, DateTime now, int toFlush, FlushCallReason reason) { 
            Debug.Assert(_totalAdded == _totalAbandoned + _totalFlushed + _buffer.Count,
                    "_totalAdded == _totalAbandoned + _totalFlushed + _buffer.Count");

            _totalFlushed += toFlush; 

            if (reason != FlushCallReason.Timer) { 
                return; 
            }
 
            Debug.Trace("WebEventBufferSummary",
                "_Added=" + _totalAdded + "; deleted=" + _totalAbandoned +
                "; Flushed=" + _totalFlushed + "; buffer=" + _buffer.Count +
                "; toFlush=" + toFlush + 
                "; lastFlush=" + PrintTime(_lastRegularFlush) +
                "; lastUrgentFlush=" + PrintTime(_lastUrgentFlush) + 
                "; GetRegFlushDueTime=" + GetNextRegularFlushDueTimeInMs() + 
                "; toFlush=" + toFlush +
                "; now=" + PrintTime(now)); 

            if (!_regularTimeoutUsed) {
                if (!flushThisTime) {
                    return; 
                }
 
                Debug.Assert((now - _lastUrgentFlush).TotalMilliseconds + 499 > _urgentFlushIntervalMs, 
                    "(now - _lastUrgentFlush).TotalMilliseconds + 499 > _urgentFlushIntervalMs" +
                    "\n_lastUrgentFlush=" + PrintTime(_lastUrgentFlush) + 
                    "\nnow=" + PrintTime(now) +
                    "\n_urgentFlushIntervalMs=" + _urgentFlushIntervalMs);

                _lastUrgentFlush = now; 
            }
            else { 
                /* 
                // It's a regular callback
                if (_lastRegularFlush != DateTime.MinValue) { 
                    Debug.Assert(Math.Abs((now - _lastRegularFlush).TotalMilliseconds - _regularFlushIntervalMs) < 2000,
                        "Math.Abs((now - _lastRegularFlush).TotalMilliseconds - _regularFlushIntervalMs) < 2000" +
                        "\n_lastRegularFlush=" + PrintTime(_lastRegularFlush) +
                        "\nnow=" + PrintTime(now) + 
                        "\n_regularFlushIntervalMs=" + _regularFlushIntervalMs);
                } 
                */ 

                _lastRegularFlush = now; 
            }
        }

#endif 
    }
} 
 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.


                        

                        

                        
                        

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