/// <summary>
/// Retrieves the resource with the specified moniker.
/// </summary>
/// <param name="resourceMoniker">The identifier for the desired resource.</param>
/// <param name="cancellationToken">The token whose cancellation signals lost interest in this resource.</param>
/// <returns>A task whose result is the desired resource.</returns>
internal async Task <TResource> GetResourceAsync(TMoniker resourceMoniker, CancellationToken cancellationToken)
{
using (AsyncReaderWriterResourceLock <TMoniker, TResource> .ResourceReleaser resourceLock = this.AcquirePreexistingLockOrThrow())
{
TResource?resource = await this.service.GetResourceAsync(resourceMoniker, cancellationToken).ConfigureAwait(false);
Task preparationTask;
lock (this.service.SyncObject)
{
this.SetResourceAsAccessed(resource);
preparationTask = this.PrepareResourceAsync(resource, cancellationToken);
}
await preparationTask.ConfigureAwait(false);
return(resource);
}
}
/// <summary>
/// Retrieves the resource with the specified moniker.
/// </summary>
/// <param name="resourceMoniker">The identifier for the desired resource.</param>
/// <param name="cancellationToken">The token whose cancellation signals lost interest in this resource.</param>
/// <returns>A task whose result is the desired resource.</returns>
internal async Task <TResource> GetResourceAsync(TMoniker resourceMoniker, CancellationToken cancellationToken)
{
using (var resourceLock = this.AcquirePreexistingLockOrThrow())
{
var resource = await this.service.GetResourceAsync(resourceMoniker, cancellationToken).ConfigureAwait(false);
Task preparationTask;
lock (this.service.SyncObject)
{
this.SetResourceAsAccessed(resource);
// We can't currently use the caller's cancellation token for this task because
// this task may be shared with others or call this method later, and we wouldn't
// want their requests to be cancelled as a result of this first caller cancelling.
preparationTask = this.PrepareResourceAsync(resource, cancellationToken);
}
await preparationTask.ConfigureAwait(false);
return(resource);
}
}
/// <summary>
/// Gets the lock protected resource.
/// </summary>
/// <param name="resourceMoniker">The identifier for the protected resource.</param>
/// <param name="cancellationToken">A token whose cancellation signals lost interest in the protected resource.</param>
/// <returns>A task whose result is the resource.</returns>
public Task <TResource> GetResourceAsync(TMoniker resourceMoniker, CancellationToken cancellationToken = default(CancellationToken))
{
return(this.helper.GetResourceAsync(resourceMoniker, cancellationToken));
}
