protected override void ActOnItem(WorkQueueItem item)
{
// We need to know if the target still exist. Use the default entity flag, rather than proxy.
var target = PersistenceScope.CurrentContext.Load <Entity>(MergeWorkQueueItem.GetTargetRef(item), EntityLoadFlags.None);
if (target == null)
{
throw new TargetAlreadyDeletedException(); // target has already been deleted somewhere else. Nothing to act on.
}
var handler = CollectionUtils.SelectFirst <IMergeHandler>(
new MergeHandlerExtensionPoint().CreateExtensions(), h => h.SupportsTarget(target));
if (handler == null)
{
throw new NotSupportedException(
string.Format("No extension found that supports merging entities of class {0}.", target.GetClass().FullName));
}
var stage = GetStage(item);
Platform.Log(LogLevel.Info, "Starting merge step on target {0} (stage {1})...", target.GetRef(), stage);
var nextStage = handler.Merge(target, stage, PersistenceScope.CurrentContext);
Platform.Log(LogLevel.Info, "Completed merge step on target {0} (stage {1}, next stage is {2}).", target.GetRef(), stage, nextStage);
// update the work item with the new stage value
item.ExtendedProperties[StageProperty] = nextStage.ToString();
}
private void RestartItemAtStageZero(WorkQueueItem item)
{
var nextStage = 0;
Platform.Log(LogLevel.Info,
"Failed to complete merge step on target {0} (stage {1}). Restarting at stage {2}.",
MergeWorkQueueItem.GetTargetRef(item),
GetStage(item),
nextStage);
// update the work item with the new stage value
item.ExtendedProperties[StageProperty] = nextStage.ToString();
}
private void ConsiderItemCompletedSuccessfully(WorkQueueItem item)
{
var nextStage = -1;
Platform.Log(LogLevel.Info,
"Failed to complete merge step on target {0} (stage {1}) because target has already been deleted. Setting to stage {2}.",
MergeWorkQueueItem.GetTargetRef(item),
GetStage(item),
nextStage);
item.Complete();
item.ExtendedProperties[StageProperty] = nextStage.ToString();
}
