/// <summary>
/// Initializes a new <see cref="IItemQueue{TItem}"/>.
/// </summary>
/// <param name="itemQueue">An <see cref="IItemQueue{TItem}"/>.</param>
/// <param name="queueItemHandler">An <see cref="IQueueItemHandler{TItem}"/>.</param>
/// <param name="queueProcessorSettings">An <see cref="ItemQueueProcessorSettings"/>.</param>
/// <param name="logger">An <see cref="ILogger"/>.</param>
/// <exception cref="ArgumentNullException">
/// - <paramref name="itemQueue"/>
/// - <paramref name="queueItemHandler"/>
/// - <paramref name="queueProcessorSettings"/>
/// - <paramref name="logger"/>
/// </exception>
public QueueProcessor(IItemQueue <TItem> itemQueue, IQueueItemHandler <TItem> queueItemHandler, IQueueProcessorSettings queueProcessorSettings, ILogger logger)
{
_ItemQueue = itemQueue ?? throw new ArgumentNullException(nameof(itemQueue));
_QueueItemHandler = queueItemHandler ?? throw new ArgumentNullException(nameof(queueItemHandler));
_QueueProcessorSettings = queueProcessorSettings ?? throw new ArgumentNullException(nameof(queueProcessorSettings));
_Logger = logger ?? throw new ArgumentNullException(nameof(logger));
var runningTaks = _RunningTasks = new TrackedList <Task>();
_ProcessQueueLock = new SemaphoreSlim(1, 1);
_TaskLock = new SemaphoreSlim(1, 1);
runningTaks.CountSetting.Changed += (newCount, oldCold) => ProcessQueue();
itemQueue.QueueSize.Changed += (newQueueSize, oldQueueSize) => ProcessQueue();
itemQueue.HeldQueueSize.Changed += (newQueueSize, oldQueueSize) => ProcessQueue();
}
/// <summary>
/// Initializes a new <see cref="ItemQueueProcessor{TItem}"/>.
/// </summary>
/// <param name="itemQueue">The <see cref="IItemQueue{TItem}"/> to listen for.</param>
/// <param name="itemQueueProcessorSettings">The <see cref="IItemQueueProcessorSettings"/>.</param>
/// <param name="logger">An <see cref="ILogger"/>.</param>
/// <param name="processItemFunc">An action to process the messages.</param>
/// <exception cref="ArgumentNullException">
/// - <paramref name="itemQueue"/>
/// - <paramref name="itemQueueProcessorSettings"/>
/// - <paramref name="logger"/>
/// - <paramref name="processItemFunc"/>
/// </exception>
public ItemQueueProcessor(IItemQueue <TItem> itemQueue, IItemQueueProcessorSettings itemQueueProcessorSettings,
ILogger logger, Func <TItem, CancellationToken, Task <bool> > processItemFunc)
{
var runningTaks = new TrackedList <Task>();
_ItemQueue = itemQueue ?? throw new ArgumentNullException(nameof(itemQueue));
_ItemQueueProcessorSettings = itemQueueProcessorSettings ?? throw new ArgumentNullException(nameof(itemQueueProcessorSettings));
_Logger = logger ?? throw new ArgumentNullException(nameof(logger));
_ProcessItemFunc = processItemFunc ?? throw new ArgumentNullException(nameof(processItemFunc));
_StartLock = new SemaphoreSlim(0, 1);
_ProcessQueueLock = new SemaphoreSlim(1, 1);
_RunningThreads = runningTaks;
_RunningTask = new Setting <Task>(defaultValue: null);
runningTaks.CountSetting.Changed += async(newCount, oldCold) => await ProcessQueueAsync(CancellationToken.None).ConfigureAwait(false);
itemQueue.QueueSize.Changed += async(newQueueSize, oldQueueSize) => await ProcessQueueAsync(CancellationToken.None).ConfigureAwait(false);
itemQueue.HeldQueueSize.Changed += async(newQueueSize, oldQueueSize) => await ProcessQueueAsync(CancellationToken.None).ConfigureAwait(false);
}