// Used by near real-time search
internal DirectoryReader(IndexWriter writer, SegmentInfos infos, int termInfosIndexDivisor)
{
this.directory = writer.GetDirectory();
this.readOnly = true;
segmentInfos = infos;
segmentInfosStart = (SegmentInfos) infos.Clone();
this.termInfosIndexDivisor = termInfosIndexDivisor;
if (!readOnly)
{
// We assume that this segments_N was previously
// properly sync'd:
SupportClass.CollectionsHelper.AddAllIfNotContains(synced, infos.Files(directory, true));
}
// IndexWriter synchronizes externally before calling
// us, which ensures infos will not change; so there's
// no need to process segments in reverse order
int numSegments = infos.Count;
SegmentReader[] readers = new SegmentReader[numSegments];
Directory dir = writer.GetDirectory();
int upto = 0;
for (int i = 0; i < numSegments; i++)
{
bool success = false;
try
{
SegmentInfo info = infos.Info(i);
if (info.dir == dir)
{
readers[upto++] = writer.readerPool.GetReadOnlyClone(info, true, termInfosIndexDivisor);
}
success = true;
}
finally
{
if (!success)
{
// Close all readers we had opened:
for (upto--; upto >= 0; upto--)
{
try
{
readers[upto].Close();
}
catch (System.Exception ignore)
{
// keep going - we want to clean up as much as possible
}
}
}
}
}
this.writer = writer;
if (upto < readers.Length)
{
// This means some segments were in a foreign Directory
SegmentReader[] newReaders = new SegmentReader[upto];
Array.Copy(readers, 0, newReaders, 0, upto);
readers = newReaders;
}
Initialize(readers);
}
public override void Merge(IndexWriter writer)
{
// TODO: enable this once we are on JRE 1.5
// assert !Thread.holdsLock(writer);
this.writer = writer;
InitMergeThreadPriority();
dir = writer.GetDirectory();
// 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 (Verbose())
{
Message("now merge");
Message(" index: " + writer.SegString());
}
// Iterate, pulling from the IndexWriter's queue of
// pending merges, until it's empty:
while (true)
{
// TODO: we could be careful about which merges to do in
// the BG (eg maybe the "biggest" ones) vs FG, which
// merges to do first (the easiest ones?), etc.
MergePolicy.OneMerge merge = writer.GetNextMerge();
if (merge == null)
{
if (Verbose())
Message(" no more merges pending; now return");
return ;
}
// We do this w/ the primary thread to keep
// deterministic assignment of segment names
writer.MergeInit(merge);
bool success = false;
try
{
lock (this)
{
MergeThread merger;
while (MergeThreadCount(true) >= maxThreadCount)
{
if (Verbose())
Message(" too many merge threads running; stalling...");
try
{
System.Threading.Monitor.Wait(this);
}
catch (System.Threading.ThreadInterruptedException ie)
{
// In 3.0 we will change this to throw
// InterruptedException instead
SupportClass.ThreadClass.Current().Interrupt();
throw new System.SystemException(ie.Message, ie);
}
}
if (Verbose())
Message(" consider merge " + merge.SegString(dir));
// OK to spawn a new merge thread to handle this
// merge:
merger = GetMergeThread(writer, merge);
mergeThreads.Add(merger);
if (Verbose())
Message(" launch new thread [" + merger.Name + "]");
merger.Start();
success = true;
}
}
finally
{
if (!success)
{
writer.MergeFinish(merge);
}
}
}
}
internal SegmentMerger(IndexWriter writer, System.String name, MergePolicy.OneMerge merge)
{
InitBlock();
directory = writer.GetDirectory();
segment = name;
if (merge != null)
{
checkAbort = new CheckAbort(merge, directory);
}
else
{
checkAbort = new AnonymousClassCheckAbort1(this, null, null);
}
termIndexInterval = writer.GetTermIndexInterval();
}
