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QueueHandler.cs
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using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Grumpy.Common.Interfaces;
using Grumpy.Logging;
using Grumpy.MessageQueue.Enum;
using Grumpy.MessageQueue.Exceptions;
using Grumpy.MessageQueue.Interfaces;
using Microsoft.Extensions.Logging;
namespace Grumpy.MessageQueue
{
/// <inheritdoc />
// ReSharper disable once ClassWithVirtualMembersNeverInherited.Global
public class QueueHandler : IQueueHandler
{
private readonly ILogger _logger;
private readonly IQueueFactory _queueFactory;
private readonly ITaskFactory _taskFactory;
private readonly List<ITask> _workTasks;
private readonly Stopwatch _heartRateMonitor;
private CancellationTokenSource _cancellationTokenSource;
private CancellationTokenRegistration _cancellationTokenRegistration;
private IQueue _queue;
private Action<object, CancellationToken> _messageHandler;
private Action<object, Exception> _errorHandlerAction;
private Func<object, Exception, bool> _errorHandlerFunc;
private Action _heartbeatHandler;
private ITask _processTask;
private int _heartRateMilliseconds;
private int _numberOfException;
private bool _multiThreadedHandler;
private bool _messageReceived;
private bool _syncMode;
private bool _disposed;
private string _queueName;
/// <inheritdoc />
public QueueHandler(ILogger logger, IQueueFactory queueFactory, ITaskFactory taskFactory)
{
_queueFactory = queueFactory;
_taskFactory = taskFactory;
_logger = logger;
_workTasks = new List<ITask>();
_heartRateMonitor = new Stopwatch();
_messageReceived = true;
}
/// <inheritdoc />
public bool Idle => _workTasks.Count == 0 && !_messageReceived && _numberOfException == 0 || (_cancellationTokenSource?.Token.IsCancellationRequested ?? true);
/// <inheritdoc />
public void Start(string queueName, bool privateQueue, LocaleQueueMode localeQueueMode, bool transactional, Action<object, CancellationToken> messageHandler, Action<object, Exception> errorHandler, Action heartbeatHandler, int heartRateMilliseconds, bool multiThreadedHandler, bool syncMode, CancellationToken cancellationToken)
{
_errorHandlerFunc = null;
_errorHandlerAction = errorHandler;
Start(queueName, privateQueue, localeQueueMode, transactional, messageHandler, heartbeatHandler, heartRateMilliseconds, multiThreadedHandler, syncMode, cancellationToken);
}
/// <inheritdoc />
public void Start(string queueName, bool privateQueue, LocaleQueueMode localeQueueMode, bool transactional, Action<object, CancellationToken> messageHandler, Func<object, Exception, bool> errorHandler, Action heartbeatHandler, int heartRateMilliseconds, bool multiThreadedHandler, bool syncMode, CancellationToken cancellationToken)
{
_errorHandlerFunc = errorHandler;
_errorHandlerAction = null;
Start(queueName, privateQueue, localeQueueMode, transactional, messageHandler, heartbeatHandler, heartRateMilliseconds, multiThreadedHandler, syncMode, cancellationToken);
}
private void Start(string queueName, bool privateQueue, LocaleQueueMode localeQueueMode, bool transactional, Action<object, CancellationToken> messageHandler, Action heartbeatHandler, int heartRateMilliseconds, bool multiThreadedHandler, bool syncMode, CancellationToken cancellationToken)
{
if (_cancellationTokenSource != null)
throw new ArgumentException("Handler not stopped");
if (heartRateMilliseconds <= 0 && heartbeatHandler != null)
throw new ArgumentException("Invalid Heart Rate", nameof(heartRateMilliseconds));
_queueName = queueName;
_cancellationTokenSource = new CancellationTokenSource();
_syncMode = syncMode;
_queue = _queueFactory.CreateLocale(_queueName, privateQueue, localeQueueMode, transactional, AccessMode.Receive);
_messageHandler = messageHandler ?? throw new ArgumentNullException(nameof(messageHandler));
_heartbeatHandler = heartbeatHandler;
_heartRateMilliseconds = heartRateMilliseconds;
_multiThreadedHandler = multiThreadedHandler;
_cancellationTokenRegistration = cancellationToken.Register(Stop);
if (_syncMode)
Process();
else
{
_processTask = _taskFactory.Create();
_processTask.Start(Process, _cancellationTokenSource.Token);
}
_logger.Information("Queue Handler started {QueueName}", _queueName);
}
/// <inheritdoc />
public void Stop()
{
if (!_cancellationTokenSource?.IsCancellationRequested ?? false)
_cancellationTokenSource?.Cancel();
_cancellationTokenSource?.Dispose();
_cancellationTokenSource = null;
Parallel.ForEach(_workTasks, t =>
{
t.Wait();
t.Dispose();
});
_processTask?.Dispose();
_cancellationTokenSource?.Dispose();
_cancellationTokenRegistration.Dispose();
_queue?.Dispose();
_logger.Information("Queue Handler stopped {QueueName}", _queueName);
}
/// <inheritdoc />
public void Dispose()
{
Dispose(true);
}
/// <summary>
/// Dispose locale objects
/// </summary>
/// <param name="disposing">Disposing</param>
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2213:DisposableFieldsShouldBeDisposed")]
protected virtual void Dispose(bool disposing)
{
if (!_disposed)
{
_disposed = true;
if (disposing)
Stop();
}
}
private void Process()
{
try
{
while (!(_cancellationTokenSource?.Token.IsCancellationRequested ?? true))
{
Heartbeat();
var message = ReceiveMessage();
if (message != null)
AddTask(message);
else if (_numberOfException == 0)
{
CleanUpTasks();
if (_syncMode)
Stop();
}
}
}
catch (Exception exception)
{
_logger.Warning(exception, "Error processing queue handler {QueueName}", _queueName);
if (_syncMode)
throw new QueueHandlerProcessException(exception);
_cancellationTokenSource?.Token.WaitHandle?.WaitOne(TimeSpan.FromMilliseconds(60000));
}
}
private ITransactionalMessage ReceiveMessage()
{
try
{
var transactionalMessage = _queue.Receive(_heartRateMilliseconds - (int)(_heartRateMonitor?.ElapsedMilliseconds ?? 0), _cancellationTokenSource.Token);
_numberOfException = 0;
_messageReceived = transactionalMessage?.Message != null;
if (_messageReceived)
return transactionalMessage;
}
catch (Exception exception)
{
_logger.Information(exception, "Exception receiving message {RetryCount}", _numberOfException);
_messageReceived = false;
if (++_numberOfException >= 3)
throw;
}
return null;
}
private void Handler(object message)
{
if (message is ITransactionalMessage transactionalMessage)
Handler(transactionalMessage);
else
_logger.Warning("Invalid message type received {QueueName} {Type} {@Message}", _queueName, message.GetType().FullName, message);
}
private void Handler(ITransactionalMessage message)
{
_logger.Debug("Handler called {QueueName} {@Message}", _queueName, message?.Message);
try
{
_messageHandler(message.Message, _cancellationTokenSource.Token);
message.Ack();
}
catch (Exception exception)
{
ErrorHandler(message, exception);
}
}
private void ErrorHandler(ITransactionalMessage message, Exception exception)
{
_logger.Debug(exception, "Error Handler called {QueueName} {@Message}", _queueName, message?.Message);
try
{
if (CallErrorHandler(message.Message, exception))
message.Ack();
else
message.NAck();
}
catch (Exception ex)
{
_logger.Information(ex, "Exception in Error Handler {QueueName} {@Message} {@Exception}", _queueName, message, exception);
message?.NAck();
}
}
private bool CallErrorHandler(object message, Exception exception)
{
if (_errorHandlerFunc != null)
return _errorHandlerFunc(message, exception);
if (_errorHandlerAction == null)
return false;
_errorHandlerAction(message, exception);
return true;
}
private void Heartbeat()
{
if (_heartbeatHandler == null)
return;
if (!_heartRateMonitor.IsRunning)
{
_heartRateMonitor.Start();
return;
}
if (_numberOfException > 0 || _heartRateMonitor?.ElapsedMilliseconds < _heartRateMilliseconds)
return;
_logger.Debug("Heartbeat Handler called {QueueName}", _queueName);
try
{
_heartbeatHandler.Invoke();
}
catch (Exception exception)
{
_logger.Warning(exception, "Error in Heartbeat Handler {QueueName}", _queueName);
}
_heartRateMonitor?.Restart();
}
private void AddTask(ITransactionalMessage message)
{
try
{
if (_syncMode)
Handler(message);
else
{
var task = _taskFactory.Create();
task.Start(Handler, message, _cancellationTokenSource.Token);
_workTasks.Add(task);
if (!_multiThreadedHandler)
task.Wait();
}
}
catch (Exception exception)
{
_logger.Warning(exception, "Error starting handler task {QueueName} {@Message}", _queueName, message?.Message);
ErrorHandler(message, new TaskCreationException(exception));
}
}
private void CleanUpTasks()
{
if (_numberOfException == 0)
{
try
{
if (_workTasks.Any())
{
_logger.Debug("Cleaning up dead tasks {QueueName}", _queueName);
foreach (var task in _workTasks.Where(t => t.IsCompleted || t.IsFaulted))
{
if (task.IsFaulted)
CallErrorHandler(task.AsyncState, task.Exception);
task.Dispose();
}
_workTasks.RemoveAll(t => t.IsCompleted || t.IsFaulted);
}
}
catch (Exception exception)
{
_logger.Information(exception, "Error in cleaning up dead tasks {QueueName}", _queueName);
}
}
}
}
}