Lucene.Net.Index.IndexWriter.MergeFinish C# (CSharp) Method

		internal void  MergeFinish(MergePolicy.OneMerge merge)
		{
			lock (this)
			{
				
				// Optimize, addIndexes or finishMerges may be waiting
				// on merges to finish.
				System.Threading.Monitor.PulseAll(this);
				
				// It's possible we are called twice, eg if there was an
				// exception inside mergeInit
				if (merge.registerDone)
				{
					SegmentInfos sourceSegments = merge.segments;
					int end = sourceSegments.Count;
					for (int i = 0; i < end; i++)
						mergingSegments.Remove(sourceSegments.Info(i));
                    if(merge.info != null)
					    mergingSegments.Remove(merge.info);
					merge.registerDone = false;
				}
				
				runningMerges.Remove(merge);
			}
		}
		

        public override void Merge(IndexWriter writer, MergeTrigger trigger, bool newMergesFound)
        {
            lock (this)
            {
                //Debug.Assert(!Thread.holdsLock(writer));

                this.m_writer = writer;

                InitMergeThreadPriority();

                m_dir = writer.Directory;

                // First, quickly run through the newly proposed merges
                // and add any orthogonal merges (ie a merge not
                // involving segments already pending to be merged) to
                // the queue.  If we are way behind on merging, many of
                // these newly proposed merges will likely already be
                // registered.

                if (IsVerbose)
                {
                    Message("now merge");
                    Message("  index: " + writer.SegString());
                }

                // Iterate, pulling from the IndexWriter's queue of
                // pending merges, until it's empty:
                while (true)
                {
                    long startStallTime = 0;
                    while (writer.HasPendingMerges() && MergeThreadCount >= maxMergeCount)
                    {
                        // this means merging has fallen too far behind: we
                        // have already created maxMergeCount threads, and
                        // now there's at least one more merge pending.
                        // Note that only maxThreadCount of
                        // those created merge threads will actually be
                        // running; the rest will be paused (see
                        // updateMergeThreads).  We stall this producer
                        // thread to prevent creation of new segments,
                        // until merging has caught up:
                        startStallTime = Environment.TickCount;
                        if (IsVerbose)
                        {
                            Message("    too many merges; stalling...");
                        }
                        //try
                        //{
                        Monitor.Wait(this);
                        //}
                        //catch (ThreadInterruptedException ie) // LUCENENET NOTE: Senseless to catch and rethrow the same exception type
                        //{
                        //    throw new ThreadInterruptedException(ie.ToString(), ie);
                        //}
                    }

                    if (IsVerbose)
                    {
                        if (startStallTime != 0)
                        {
                            Message("  stalled for " + (Environment.TickCount - startStallTime) + " msec");
                        }
                    }

                    MergePolicy.OneMerge merge = writer.NextMerge();
                    if (merge == null)
                    {
                        if (IsVerbose)
                        {
                            Message("  no more merges pending; now return");
                        }
                        return;
                    }

                    bool success = false;
                    try
                    {
                        if (IsVerbose)
                        {
                            Message("  consider merge " + writer.SegString(merge.Segments));
                        }

                        // OK to spawn a new merge thread to handle this
                        // merge:
                        MergeThread merger = GetMergeThread(writer, merge);
                        m_mergeThreads.Add(merger);
                        if (IsVerbose)
                        {
                            Message("    launch new thread [" + merger.Name + "]");
                        }

                        merger.Start();

                        // Must call this after starting the thread else
                        // the new thread is removed from mergeThreads
                        // (since it's not alive yet):
                        UpdateMergeThreads();

                        success = true;
                    }
                    finally
                    {
                        if (!success)
                        {
                            writer.MergeFinish(merge);
                        }
                    }
                }
            }
        }