protected void Flush(bool continue_only)
{
IndexerRequest flushed_request;
if (continue_only)
{
// if the request is merely to signal indexhelper to continue indexing,
// then sent a fake indexerrequest but then use the previous request to retrieve
// deferred indexables
flushed_request = new IndexerRequest();
flushed_request.ContinueIndexing = true;
// Do not pass this through PreFlushHook since this is a fake request
}
else
{
lock (request_lock) {
if (pending_request.IsEmpty)
{
return;
}
flushed_request = pending_request;
pending_request = new IndexerRequest();
// We hold the request_lock when calling PreFlushHook, so
// that no other requests can come in until it exits.
PreFlushHook(flushed_request);
}
}
IndexerReceipt [] receipts;
receipts = indexer.Flush(flushed_request);
PostFlushHook(flushed_request, receipts);
if (continue_only)
{
flushed_request = pending_request;
}
// Silently return if we get a null back. This is probably
// a bad thing to do. If IndexHelper is shutdown because of
// memory blowup or is crashed, then null is returned. Silently
// returning means ignoring the indexables in the IndexHelper's
// queue (which could be more than what was sent in the last request,
// since there could be some deferred-indexables too).
if (receipts == null)
{
return;
}
// Nothing happened (except maybe an optimize, which does not
// generate a receipt). Also do nothing.
if (receipts.Length == 0)
{
return;
}
// Update the cached count of items in the driver
// FIXME: Verify that this still works after all the deferred-indexable fu
driver.SetItemCount(indexer.GetItemCount());
// Something happened, so schedule an optimize just in case.
ScheduleOptimize();
if (fa_store != null)
{
fa_store.BeginTransaction();
}
ArrayList added_uris = new ArrayList();
ArrayList removed_uris = new ArrayList();
bool indexer_indexable_receipt = false;
for (int i = 0; i < receipts.Length; ++i)
{
if (receipts [i] is IndexerAddedReceipt)
{
IndexerAddedReceipt r;
r = (IndexerAddedReceipt)receipts [i];
Indexable indexable = flushed_request.RetrieveRequestIndexable(r);
if (indexable == null)
{
Log.Debug("Should not happen! Previously requested indexable with id #{0} has eloped!", r.Id);
continue;
}
// Add the Uri to the list for our change data
// *before* doing any post-processing.
// This ensures that we have internal uris when
// we are remapping.
added_uris.Add(indexable.Uri);
// Call the appropriate hook
Uri notification_uri = indexable.Uri;
try {
// Map from internal->external Uris in the PostAddHook
notification_uri = PostAddHook(indexable, r);
} catch (Exception ex) {
Logger.Log.Warn(ex, "Caught exception in PostAddHook '{0}' '{1}' '{2}'",
indexable.Uri, r.FilterName, r.FilterVersion);
}
// Every added Uri also needs to be listed as removed,
// to avoid duplicate hits in the query. Since the
// removed Uris need to be external Uris, we add them
// to the list *after* post-processing.
removed_uris.Add(notification_uri);
}
else if (receipts [i] is IndexerRemovedReceipt)
{
IndexerRemovedReceipt r;
r = (IndexerRemovedReceipt)receipts [i];
Indexable indexable = flushed_request.RetrieveRequestIndexable(r);
if (indexable == null) // Should never happen
{
Log.Warn("Unable to match indexable-remove #{0} to any request!", r.Id);
continue;
}
// Call the appropriate hook
Uri notification_uri = indexable.Uri;
try {
notification_uri = PostRemoveHook(indexable, r.NumRemoved);
} catch (Exception ex) {
Logger.Log.Warn(ex, "Caught exception in PostRemoveHook '{0}'",
indexable.Uri);
}
// If nothing was removed, no need for change notification
if (r.NumRemoved <= 0)
{
continue;
}
// Add the removed Uri to the list for our
// change data. This will be an external Uri
// when we are remapping.
removed_uris.Add(notification_uri);
}
else if (receipts [i] is IndexerIndexablesReceipt)
{
indexer_indexable_receipt = true;
}
}
if (!continue_only)
{
lock (request_lock) {
pending_request.DeferredIndexables = flushed_request.DeferredIndexables;
}
}
if (indexer_indexable_receipt)
{
Log.Debug("Indexing of indexer generated indexables is paused. Scheduling job to continue.");
// Create a task asking the indexer to continue indexing
Scheduler.Task task;
task = Scheduler.TaskFromHook(new Scheduler.TaskHook(ContinueIndexerIndexableIndexing));
// Schedule it so that it is the immediate next task to be scheduled
task.Priority = Scheduler.Priority.Immediate;
task.SubPriority = 100;
task.Source = this;
task.Tag = "Continue indexing generated indexables from " + IndexName;
ThisScheduler.Add(task);
}
if (fa_store != null)
{
fa_store.CommitTransaction();
}
// Propagate the change notification to any open queries.
if (added_uris.Count > 0 || removed_uris.Count > 0)
{
ChangeData change_data;
change_data = new ChangeData();
change_data.AddedUris = added_uris;
change_data.RemovedUris = removed_uris;
QueryDriver.QueryableChanged(this, change_data);
}
}
// This is mostly a copy of LuceneQueryable.Flush + FSQ.PostAddHooks/PostRemoveHook
static bool FlushIndexer(IIndexer indexer)
{
IndexerRequest flushed_request;
if (pending_request.IsEmpty)
{
return(false);
}
flushed_request = pending_request;
pending_request = new IndexerRequest();
IndexerReceipt [] receipts;
receipts = indexer.Flush(flushed_request);
// Flush will return null if it encounters a shutdown during flushing
if (receipts == null)
{
return(false);
}
fa_store.BeginTransaction();
bool indexer_indexable_receipt = false;
foreach (IndexerReceipt raw_r in receipts)
{
if (raw_r is IndexerAddedReceipt)
{
// Update the file attributes
IndexerAddedReceipt r = (IndexerAddedReceipt)raw_r;
Indexable indexable = flushed_request.RetrieveRequestIndexable(r);
if (indexable == null)
{
Logger.Log.Debug("Should not happen! Previously requested indexable with id #{0} has eloped!", r.Id);
continue;
}
// We don't need to write out any file attributes for
// children.
if (indexable.ParentUri != null)
{
continue;
}
string path = indexable.Uri.LocalPath;
FileAttributes attr;
attr = fa_store.ReadOrCreate(path);
attr.LastWriteTime = indexable.Timestamp;
attr.FilterName = r.FilterName;
attr.FilterVersion = r.FilterVersion;
fa_store.Write(attr);
}
else if (raw_r is IndexerRemovedReceipt)
{
// Update the file attributes
IndexerRemovedReceipt r = (IndexerRemovedReceipt)raw_r;
Indexable indexable = flushed_request.RetrieveRequestIndexable(r);
if (indexable == null) // Should never happen
{
Log.Warn("Unable to match indexable-remove #{0} to any request!", r.Id);
continue;
}
string path = indexable.Uri.LocalPath;
Logger.Log.Debug("Removing: '{0}'", path);
fa_store.Drop(path);
}
else if (raw_r is IndexerIndexablesReceipt)
{
indexer_indexable_receipt = true;
}
}
pending_request.DeferredIndexables = flushed_request.DeferredIndexables;
// Reschedule if some indexable generated more indexables
if (indexer_indexable_receipt)
{
pending_request.ContinueIndexing = true;
return(true);
}
fa_store.CommitTransaction();
return(false);
}