/// <summary>
/// Move key from JobQueue to processingQueue, get key value from cache.
///
/// Also set the active field. Indicates when job was retrieved so we can monitor
/// its time.
/// </summary>
/// <returns></returns>
private async Task <RedisValueDictionary> GetJobAsync()
{
var db = Database;
var value = new RedisValueDictionary();
while (!_cancellationToken.IsCancellationRequested)
{
string key = await db.ListRightPopLeftPushAsync(_jobQueue, _processingQueue);
// If key is null, then nothing was there to get, so no value is available
if (string.IsNullOrEmpty(key))
{
value.Clear();
break;
}
await db.HashSetAsync(key, "active", (DateTime.UtcNow - new DateTime(1970, 1, 1)).TotalMilliseconds);
value = (RedisValueDictionary)(await db.HashGetAllAsync(key)).ToDictionary();
// if Count is 0, remove it and check for the next job
if (value.Count == 0)
{
await db.ListRemoveAsync(_processingQueue, key, flags : CommandFlags.FireAndForget);
continue;
}
value.Key = key;
break;
}
return(value);
}
/// <summary>
/// Add a job to the Queue (async)
///
/// Adds a Dictionary to the message, both values are RedisValue.
///
/// Reserved names for dictionary keys are 'key', 'active', 'failedcount'
/// </summary>
/// <param name="parametersDictionary"></param>
/// <returns></returns>
public async Task AddJobAsync(RedisValueDictionary parametersDictionary)
{
if (parametersDictionary.Count == 0)
{
return;
}
if (parametersDictionary.ContainsKey("key") ||
parametersDictionary.ContainsKey("active") ||
parametersDictionary.ContainsKey("failedcount"))
{
Trace.WriteLine("Parameter 'key', 'active' or 'failedcount' are reserved.");
return;
}
var db = Database;
var key = await GetNextJobId();
await db.HashSetAsync(key, parametersDictionary.Select(entries => new HashEntry(entries.Key, entries.Value)).ToArray());
await db.ListLeftPushAsync(_jobQueue, key, When.Always, CommandFlags.FireAndForget);
await ConnectionMultiplexer.GetSubscriber().PublishAsync(_subChannel, "", CommandFlags.FireAndForget);
}