public override async Task BeforeEnter()
{
// Make sure only one update action is done at a time
using (await _syncLockFactory.Create().ConfigureAwait(false)) {
await _projectionDataService.UpdateProjection().ConfigureAwait(false);
_projectedData = await _projectionDataService.GetProjection().ConfigureAwait(false);
}
}
public override async Task AfterEnter()
{
// Update asynchronously so that other threads receive the previous projection and don't wait for the update
await Task.Factory.StartNew(async() => {
// Make sure only one update action is done at a time
using (await _syncLockFactory.Create().ConfigureAwait(false)) {
await _projectionDataService.UpdateProjection().ConfigureAwait(false);
_projectedData = await _projectionDataService.GetProjection().ConfigureAwait(false);
}
await _projectionSystem.MarkProjectionAsUpToDate().ConfigureAwait(false);
}, CancellationToken.None, TaskCreationOptions.LongRunning, _taskScheduler)
.ConfigureAwait(false);
}
public async Task <IEnumerable <TItem> > GetProjection()
{
using (await _getProjectionLockFactory.Create().ConfigureAwait(false)) {
if (State.Id == StateId.Uninitialised)
{
await TransitionToCreatingState().ConfigureAwait(false);
}
if (State.Id == StateId.Expired)
{
await TransitionToUpdatingState().ConfigureAwait(false);
}
return(await State.GetProjection().ConfigureAwait(false));
}
}