/*
* FlushAllThreads is synced by IW fullFlushLock. Flushing all threads is a
* two stage operation; the caller must ensure (in try/finally) that finishFlush
* is called after this method, to release the flush lock in DWFlushControl
*/
internal bool FlushAllThreads(IndexWriter indexWriter)
{
DocumentsWriterDeleteQueue flushingDeleteQueue;
if (infoStream.IsEnabled("DW"))
{
infoStream.Message("DW", "startFullFlush");
}
lock (this)
{
pendingChangesInCurrentFullFlush = AnyChanges();
flushingDeleteQueue = deleteQueue;
/* Cutover to a new delete queue. this must be synced on the flush control
* otherwise a new DWPT could sneak into the loop with an already flushing
* delete queue */
flushControl.MarkForFullFlush(); // swaps the delQueue synced on FlushControl
Debug.Assert(SetFlushingDeleteQueue(flushingDeleteQueue));
}
Debug.Assert(currentFullFlushDelQueue != null);
Debug.Assert(currentFullFlushDelQueue != deleteQueue);
bool anythingFlushed = false;
try
{
DocumentsWriterPerThread flushingDWPT;
// Help out with flushing:
while ((flushingDWPT = flushControl.NextPendingFlush()) != null)
{
anythingFlushed |= DoFlush(flushingDWPT);
}
// If a concurrent flush is still in flight wait for it
flushControl.WaitForFlush();
if (!anythingFlushed && flushingDeleteQueue.AnyChanges()) // apply deletes if we did not flush any document
{
if (infoStream.IsEnabled("DW"))
{
infoStream.Message("DW", Thread.CurrentThread.Name + ": flush naked frozen global deletes");
}
ticketQueue.AddDeletes(flushingDeleteQueue);
}
ticketQueue.ForcePurge(indexWriter);
Debug.Assert(!flushingDeleteQueue.AnyChanges() && !ticketQueue.HasTickets);
}
finally
{
Debug.Assert(flushingDeleteQueue == currentFullFlushDelQueue);
}
return(anythingFlushed);
}