How to use

mergeThreadCount

method

in

org.apache.lucene.index.ConcurrentMergeScheduler

while (writer.hasPendingMerges() && mergeThreadCount() >= maxMergeCount) {

/** Return the priority that merge threads run at. */
public synchronized void setMergeThreadPriority(int pri) {
 if (pri > Thread.MAX_PRIORITY || pri < Thread.MIN_PRIORITY)
  throw new IllegalArgumentException("priority must be in range " + Thread.MIN_PRIORITY + " .. " + Thread.MAX_PRIORITY + " inclusive");
 mergeThreadPriority = pri;
 final int numThreads = mergeThreadCount();
 for(int i=0;i<numThreads;i++) {
  MergeThread merge = (MergeThread) mergeThreads.get(i);
  merge.setThreadPriority(pri);
 }
}

/** Return the priority that merge threads run at. */
public synchronized void setMergeThreadPriority(int pri) {
 if (pri > Thread.MAX_PRIORITY || pri < Thread.MIN_PRIORITY)
  throw new IllegalArgumentException("priority must be in range " + Thread.MIN_PRIORITY + " .. " + Thread.MAX_PRIORITY + " inclusive");
 mergeThreadPriority = pri;
 final int numThreads = mergeThreadCount();
 for(int i=0;i<numThreads;i++) {
  MergeThread merge = (MergeThread) mergeThreads.get(i);
  merge.setThreadPriority(pri);
 }
}

/** Used for testing */
private void addMyself() {
 synchronized(allInstances) {
  final int size=0;
  int upto = 0;
  for(int i=0;i<size;i++) {
   final ConcurrentMergeScheduler other = (ConcurrentMergeScheduler) allInstances.get(i);
   if (!(other.closed && 0 == other.mergeThreadCount()))
    // Keep this one for now: it still has threads or
    // may spawn new threads
    allInstances.set(upto++, other);
  }
  allInstances.subList(upto, allInstances.size()).clear();
  allInstances.add(this);
 }
}

/** Used for testing */
private void addMyself() {
 synchronized(allInstances) {
  final int size=0;
  int upto = 0;
  for(int i=0;i<size;i++) {
   final ConcurrentMergeScheduler other = (ConcurrentMergeScheduler) allInstances.get(i);
   if (!(other.closed && 0 == other.mergeThreadCount()))
    // Keep this one for now: it still has threads or
    // may spawn new threads
    allInstances.set(upto++, other);
  }
  allInstances.subList(upto, allInstances.size()).clear();
  allInstances.add(this);
 }
}

public synchronized void sync() {
 while(mergeThreadCount() > 0) {
  message("now wait for threads; currently " + mergeThreads.size() + " still running");
  final int count = mergeThreads.size();
  for(int i=0;i<count;i++)
   message("    " + i + ": " + ((MergeThread) mergeThreads.get(i)));
  try {
   wait();
  } catch (InterruptedException e) {
  }
 }
}
private synchronized int mergeThreadCount() {

public synchronized void sync() {
 while(mergeThreadCount() > 0) {
  message("now wait for threads; currently " + mergeThreads.size() + " still running");
  final int count = mergeThreads.size();
  for(int i=0;i<count;i++)
   message("    " + i + ": " + ((MergeThread) mergeThreads.get(i)));
  try {
   wait();
  } catch (InterruptedException e) {
  }
 }
}
private synchronized int mergeThreadCount() {

while (writer.hasPendingMerges() && mergeThreadCount() >= maxMergeCount) {

while (writer.hasPendingMerges() && mergeThreadCount() >= maxMergeCount) {

while (writer.hasPendingMerges() && mergeThreadCount() >= maxMergeCount) {

while (mergeThreadCount() >= maxThreadCount) {
 message("    too many merge threads running; stalling...");
 try {
assert mergeThreadCount() < maxThreadCount;

while (mergeThreadCount() >= maxThreadCount) {
 message("    too many merge threads running; stalling...");
 try {
assert mergeThreadCount() < maxThreadCount;