internal static ScheduledTask NewInstance()
{
var disableImageOptimizationAppSetting = System.Configuration.ConfigurationManager.AppSettings[ImageOptimizationConstants.DisableImageOptimizationAppSettingKey];
bool disableImageOptimization;
if (bool.TryParse(disableImageOptimizationAppSetting, out disableImageOptimization) && disableImageOptimization)
{
return(null);
}
if (ObjectFactory.GetArgsByName(typeof(ImageOptimizationConfig).Name, typeof(ImageOptimizationConfig)) == null)
{
return(null);
}
ImageOptimizationConfig imageOptimizationConfig = Config.Get <ImageOptimizationConfig>();
if (!imageOptimizationConfig.EnableImageOptimization)
{
return(null);
}
if (!ImageOptimizationProcessorsHelper.ValidateImageOptimizationProcessorsConfigurations())
{
return(null);
}
// Schedule a task only if required IsOptimized field is present
Type contentType = typeof(Image);
MetadataManager metadataManager = MetadataManager.GetManager();
MetaType metaType = metadataManager.GetMetaType(contentType);
if (metaType != null)
{
MetaField metaField = metaType.Fields.SingleOrDefault(f => string.Compare(f.FieldName, ImageOptimizationConstants.IsOptimizedFieldName, true, CultureInfo.InvariantCulture) == 0);
if (metaField == null)
{
return(null);
}
}
string crontabConfig = imageOptimizationConfig.ImageOptimizationCronSpec;
if (string.IsNullOrEmpty(crontabConfig))
{
crontabConfig = ImageOptimizationTask.DefaultCronExpression;
}
ImageOptimizationTask task = new ImageOptimizationTask()
{
Id = Guid.NewGuid(),
ExecuteTime = DateTime.UtcNow,
ScheduleSpecType = CrontabScheduleCalculator.ScheduleSpecType,
ScheduleSpec = crontabConfig
};
return(task);
}
internal static void Schedule()
{
ImageOptimizationTask.RemoveScheduledTasks();
ScheduledTask newTask = ImageOptimizationTask.NewInstance();
if (newTask != null)
{
ImageOptimizationTask.AddScheduledTask(newTask);
}
}
private static void ConfigUpdated(ICacheDependencyHandler caller, Type trackedItemType, string trackedItemKey)
{
ImageOptimizationTask.Schedule();
}
internal static void RemoveScheduledTasks()
{
SchedulingManager manager = SchedulingManager.GetManager();
IList <ScheduledTaskData> scheduledItems = SchedulingManager.GetTasksFromAllProviders(t => t.TaskName == ImageOptimizationTask.GetTaskName());
foreach (ScheduledTaskData task in scheduledItems)
{
manager.DeleteItem(task);
}
manager.SaveChanges();
}
