/// <summary>
/// Set up regular schedule for running jobs.
/// </summary>
private void SetUpSchedule()
{
var parameters = new Dictionary <string, object>();
parameters.Add("Method", "SetUpSchedule");
// Run async, so we are not holding up the ability to start the hosted service.
Task.Run(async() =>
{
// Continue to run the task until cancellation is requested.
while (!_hostApplicationLifetime.ApplicationStopping.IsCancellationRequested)
{
// Get the recent tweets schedule from Api > Tweets > SyncRecentSchedule in appsettings.json.
var importRecentTweetsSchedule = _apiConfiguration.Value.Tweets.SyncRecentSchedule.HasValue ? _apiConfiguration.Value.Tweets.SyncRecentSchedule.Value : new TimeSpan(0, 5, 0);
var nextSchedule = Task.Delay(importRecentTweetsSchedule, _hostApplicationLifetime.ApplicationStopping); // Delay the schedule until the sync recent schedule has been reached.
_logger.LogWithParameters(LogLevel.Information, string.Format("Set up schedule for importing recent tweets. The importing of recent tweets will happen every {0}", importRecentTweetsSchedule.ToString("h\\:mm\\:ss")), parameters);
await nextSchedule;
// Import recent tweets from the Twitter API.
ImportRecentTweetsFromTwitterApiTask = new ImportRecentTweetsFromTwitterApiTask(_serviceProvider, _hostApplicationLifetime.ApplicationStopping);
await _twitterIntegrationJobService.RunJobAsync(new TwitterIntegrationJob((Guid id) => ImportRecentTweetsFromTwitterApiTask.RunAsync(id)));
}
;
});
}
/// <summary>
/// Starts the hosted service, running the tasks needed before the API can properly initalise.
/// </summary>
/// <param name="cancellationToken">Propagates notification that operations should be cancelled.</param>
/// <returns>An instance of <see cref="Task"/>.</returns>
public async Task StartAsync(CancellationToken cancellationToken)
{
var parameters = new Dictionary <string, object>();
parameters.Add("Method", "StartAsync");
_logger.LogWithParameters(LogLevel.Information, "Starting Twitter Integration Background Service...", parameters);
// Create Tasks
var importRulesFromTwitterTask = new ImportRulesFromTwitterApiTask(_serviceProvider, _hostApplicationLifetime.ApplicationStopping);
ImportRecentTweetsFromTwitterApiTask = new ImportRecentTweetsFromTwitterApiTask(_serviceProvider, _hostApplicationLifetime.ApplicationStopping);
ListenForRealtimeTweetsFromTwitterApiTask = new ListenForRealtimeTweetsFromTwitterApiTask(_serviceProvider, _hostApplicationLifetime.ApplicationStopping);
// Process Tweet when Recieved
ListenForRealtimeTweetsFromTwitterApiTask.OnTweetReceived += async(tweetResponse) =>
{
// When a tweet is received run the 'OnRealtimeTweetReceivedTask' task.
await _twitterIntegrationJobService.RunJobAsync(new TwitterIntegrationJob((Guid id) => new OnRealtimeTweetReceivedTask(_serviceProvider, _hostApplicationLifetime.ApplicationStopping, tweetResponse).RunAsync(id)));
};
// Run Tasks for importing rules, listening for realtime tweets, and importing recent tweets.
await _twitterIntegrationJobService.RunJobAsync(new TwitterIntegrationJob((Guid id) => importRulesFromTwitterTask.RunAsync(id)));
await _twitterIntegrationJobService.RunJobAsync(new TwitterIntegrationJob((Guid id) => ListenForRealtimeTweetsFromTwitterApiTask.RunAsync(id)));
await _twitterIntegrationJobService.RunJobAsync(new TwitterIntegrationJob((Guid id) => ImportRecentTweetsFromTwitterApiTask.RunAsync(id)));
// Schedule a task to import for the recent tweets at regular intervals.
SetUpSchedule();
_logger.LogWithParameters(LogLevel.Information, "Started Twitter Integration Background Service", parameters);
}
/// <summary>
/// Runs the recent tweets task for a particular dashboard.
/// </summary>
/// <param name="dashboard"></param>
/// <returns></returns>
protected async Task ImportTweetsForDashboard(Dashboard dashboard)
{
var parameters = new Dictionary <string, object>();
parameters.Add("Method", "UpdateTweetsForDashboard");
parameters.Add("DB Dashboard ID", dashboard.Id);
try
{
_logger.LogWithParameters(LogLevel.Information, "Start importing tweets for nearly created dashboard.", parameters);
var importRecentTweetsFromTwitterApiTask = new ImportRecentTweetsFromTwitterApiTask(_serviceProvider, new System.Threading.CancellationTokenSource().Token, dashboard); // Creates the task.
await _twitterIntegrationJobService.RunJobAsync(new TwitterIntegrationJob((Guid id) => importRecentTweetsFromTwitterApiTask.RunAsync(id))); // Runs the job.
_logger.LogWithParameters(LogLevel.Information, "Finish importing tweets for nearly created dashboard.", parameters);
}
catch (Exception exception)
{
// Log any exception.
_logger.LogWithParameters(LogLevel.Error, exception, exception.Message, parameters);
throw;
}
}
