/// <inheritdoc />
public IEnumerable <ITaskRuntimeInfo> ReservePollingQueueTasks(string pollingQueueKey, int maxResults)
{
Trace.WriteLine("ENTER: Reserving {0} polling queue '{1}' tasks for execution ...".FormatInvariant(maxResults, pollingQueueKey));
if (string.IsNullOrEmpty(pollingQueueKey))
{
throw new ArgumentNullException(nameof(pollingQueueKey));
}
if (maxResults < 0)
{
throw new ArgumentOutOfRangeException(nameof(maxResults), maxResults, "Value must not be negative.");
}
string pollingQueueListKey = RedisTaskRuntimeInfoRepository.GetPollingQueueRedisKey(pollingQueueKey, TaskStatus.Pending);
List <string> entityIds = new List <string>();
using (IRedisPipeline pipeline = this.provider.CreatePipeline())
{
for (int i = 0; i < maxResults; i++)
{
pipeline.PopFirstListElementAsText(pollingQueueListKey, value =>
{
if (!string.IsNullOrEmpty(value))
{
entityIds.Add(value);
}
});
}
pipeline.Flush();
}
ICollection <ITaskRuntimeInfo> result = this.GetAll(entityIds);
Trace.WriteLine("EXIT: {0} polling queue '{1}' tasks reserved for execution.".FormatInvariant(result.Count, pollingQueueKey));
return(result);
}