/// <inheritdoc cref="IDataLoader.RemoveTrigger(IDataLoaderTrigger)"/>
public void RemoveTrigger(IDataLoaderTrigger trigger)
{
trigger = trigger ?? throw new ArgumentNullException(nameof(trigger));
_triggers.Remove(trigger);
trigger.LoadRequested -= OnLoadRequested;
}
private void OnLoadRequested(IDataLoaderTrigger trigger, IDataLoaderContext context)
{
// This operation is not cancellable from the trigger itself.
// The operation will be cancelled if the loader is disposed.
context = context ?? new DataLoaderContext();
var cancellationToken = CancellationToken.None;
var sequenceId = Interlocked.Increment(ref _sequenceId);
PopulateContext(context);
_ = LoadFromTrigger(cancellationToken, new DataLoaderRequest(sequenceId, trigger, context, _contextValues));
async Task LoadFromTrigger(CancellationToken ct, DataLoaderRequest request)
{
try
{
await InnerLoad(ct, request);
}
catch (Exception e)
{
if (_logger.IsEnabled(LogLevel.Error))
{
_logger.LogError(e, "Caught unhandled exception during Load operation. Prefer injecting a strategy that handles all exceptions in your application code.");
}
}
}
}
/// <summary>
/// Adds a <see cref="IDataLoaderTrigger"/> in <see cref="IDataLoaderBuilder.TriggerProviders"/>.
/// </summary>
/// <typeparam name="TBuilder">Any type implementing <see cref="IDataLoaderBuilder"/>.</typeparam>
/// <param name="builder">The <see cref="IDataLoaderBuilder"/> reference.</param>
/// <param name="trigger">The new <see cref="IDataLoaderTrigger"/> to add.</param>
public static TBuilder WithTrigger <TBuilder>(this TBuilder builder, IDataLoaderTrigger trigger) where TBuilder : IDataLoaderBuilder
{
builder.TriggerProviders.Add(GetTrigger);
return(builder);
IDataLoaderTrigger GetTrigger(IDataLoader dataLoader)
{
return(trigger);
}
}
/// <summary>
/// Initializes a new instance of the <see cref="DataLoaderRequest"/> class.
/// </summary>
/// <param name="sequenceId">The sequence Id of this request.</param>
/// <param name="sourceTrigger"><see cref="IDataLoaderTrigger"/></param>
/// <param name="triggerContext"><see cref="IDataLoaderContext"/></param>
/// <param name="dataLoaderContextValues"></param>
public DataLoaderRequest(int sequenceId, IDataLoaderTrigger sourceTrigger, IDataLoaderContext triggerContext, IDictionary <string, object> dataLoaderContextValues)
{
SequenceId = sequenceId;
SourceTrigger = sourceTrigger ?? throw new ArgumentNullException(nameof(sourceTrigger));
Context = new MergedDataLoaderContext(triggerContext, dataLoaderContextValues);
}
