public void BuildIndexFromGraphs(CloudTableClient cloudTableClient)
{
//Let the background thread claim the wait handle.
ThreadPool.QueueUserWorkItem(
state =>
{
var registeredGraphs = registeredIndexer.GraphsIndexed;
var session = new InternalSession(registeredIndexer.Registry, backingStore);
//We use the session to manage to loading and deserialisation of graphs that contribute to the index...
session
.GetEntireStash()
.Matching(
_ =>
_.Where<StashTypeHierarchy>().AnyOf(registeredGraphs.Select(rg => StashTypeHierarchy.GetConcreteTypeValue(rg.GraphType))))
.Materialize();
//...but we then use the enrolled persistence events directly to yield the keys for this new index.
var graphProjections =
session
.EnrolledPersistenceEvents
.SelectMany(
trackedGraph => registeredIndexer.GetUntypedProjections(trackedGraph.UntypedGraph),
(graph, projection) => new {Projection = (ProjectedIndex)projection, graph.InternalId});
backingStore.InTransactionDo(
work =>
{
foreach(var projection in graphProjections)
{
try
{
Insert(projection.Projection.UntypedKey, projection.InternalId, ((AzureStorageWork)work).ServiceContext);
}
catch(InvalidOperationException ioEx)
{
var storageEx = ioEx.TranslateDataServiceClientException();
if (storageEx.ExtendedErrorInformation.ErrorCode != TableErrorCodeStrings.EntityAlreadyExists)
throw storageEx;
//This is acceptable, as it is possible for another session to insert the key
//before we match it. We carry on.
}
}
});
session.Abandon();
indexCompiled.Set();
});
}
